1 /* 2 * Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaClasses.inline.hpp" 27 #include "classfile/stringTable.hpp" 28 #include "code/codeCache.hpp" 29 #include "code/dependencyContext.hpp" 30 #include "compiler/compileBroker.hpp" 31 #include "interpreter/interpreter.hpp" 32 #include "interpreter/oopMapCache.hpp" 33 #include "interpreter/linkResolver.hpp" 34 #include "memory/allocation.inline.hpp" 35 #include "memory/oopFactory.hpp" 36 #include "memory/resourceArea.hpp" 37 #include "oops/objArrayOop.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "oops/typeArrayOop.inline.hpp" 40 #include "prims/methodHandles.hpp" 41 #include "runtime/compilationPolicy.hpp" 42 #include "runtime/interfaceSupport.inline.hpp" 43 #include "runtime/javaCalls.hpp" 44 #include "runtime/jniHandles.inline.hpp" 45 #include "runtime/timerTrace.hpp" 46 #include "runtime/reflection.hpp" 47 #include "runtime/safepointVerifiers.hpp" 48 #include "runtime/signature.hpp" 49 #include "runtime/stubRoutines.hpp" 50 #include "utilities/exceptions.hpp" 51 52 53 /* 54 * JSR 292 reference implementation: method handles 55 * The JDK 7 reference implementation represented method handle 56 * combinations as chains. Each link in the chain had a "vmentry" 57 * field which pointed at a bit of assembly code which performed 58 * one transformation before dispatching to the next link in the chain. 59 * 60 * The current reference implementation pushes almost all code generation 61 * responsibility to (trusted) Java code. A method handle contains a 62 * pointer to its "LambdaForm", which embodies all details of the method 63 * handle's behavior. The LambdaForm is a normal Java object, managed 64 * by a runtime coded in Java. 65 */ 66 67 bool MethodHandles::_enabled = false; // set true after successful native linkage 68 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 69 70 /** 71 * Generates method handle adapters. Returns 'false' if memory allocation 72 * failed and true otherwise. 73 */ 74 void MethodHandles::generate_adapters() { 75 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 76 assert(_adapter_code == NULL, "generate only once"); 77 78 ResourceMark rm; 79 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime)); 80 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 81 CodeBuffer code(_adapter_code); 82 MethodHandlesAdapterGenerator g(&code); 83 g.generate(); 84 code.log_section_sizes("MethodHandlesAdapterBlob"); 85 } 86 87 //------------------------------------------------------------------------------ 88 // MethodHandlesAdapterGenerator::generate 89 // 90 void MethodHandlesAdapterGenerator::generate() { 91 // Generate generic method handle adapters. 92 // Generate interpreter entries 93 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 94 mk <= Interpreter::method_handle_invoke_LAST; 95 mk = Interpreter::MethodKind(1 + (int)mk)) { 96 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 97 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 98 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 99 if (entry != NULL) { 100 Interpreter::set_entry_for_kind(mk, entry); 101 } 102 // If the entry is not set, it will throw AbstractMethodError. 103 } 104 } 105 106 void MethodHandles::set_enabled(bool z) { 107 if (_enabled != z) { 108 guarantee(z, "can only enable once"); 109 _enabled = z; 110 } 111 } 112 113 // MemberName support 114 115 // import java_lang_invoke_MemberName.* 116 enum { 117 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 118 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 119 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 120 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 121 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 122 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 123 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 124 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 125 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 126 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 127 }; 128 129 int MethodHandles::ref_kind_to_flags(int ref_kind) { 130 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind); 131 int flags = (ref_kind << REFERENCE_KIND_SHIFT); 132 if (ref_kind_is_field(ref_kind)) { 133 flags |= IS_FIELD; 134 } else if (ref_kind_is_method(ref_kind)) { 135 flags |= IS_METHOD; 136 } else if (ref_kind == JVM_REF_newInvokeSpecial) { 137 flags |= IS_CONSTRUCTOR; 138 } 139 return flags; 140 } 141 142 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) { 143 Handle empty; 144 Handle type(THREAD, java_lang_invoke_MemberName::type(mname())); 145 if (!java_lang_String::is_instance_inlined(type())) { 146 return type; // already resolved 147 } 148 Symbol* signature = java_lang_String::as_symbol_or_null(type()); 149 if (signature == NULL) { 150 return empty; // no such signature exists in the VM 151 } 152 Handle resolved; 153 int flags = java_lang_invoke_MemberName::flags(mname()); 154 switch (flags & ALL_KINDS) { 155 case IS_METHOD: 156 case IS_CONSTRUCTOR: 157 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty)); 158 break; 159 case IS_FIELD: 160 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty)); 161 break; 162 default: 163 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 164 } 165 if (resolved.is_null()) { 166 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty); 167 } 168 return resolved; 169 } 170 171 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) { 172 // This method is used from java.lang.invoke.MemberName constructors. 173 // It fills in the new MemberName from a java.lang.reflect.Member. 174 Thread* thread = Thread::current(); 175 oop target_oop = target(); 176 Klass* target_klass = target_oop->klass(); 177 if (target_klass == SystemDictionary::reflect_Field_klass()) { 178 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 179 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 180 Klass* k = java_lang_Class::as_Klass(clazz); 181 if (k != NULL && k->is_instance_klass()) { 182 fieldDescriptor fd(InstanceKlass::cast(k), slot); 183 oop mname2 = init_field_MemberName(mname, fd); 184 if (mname2 != NULL) { 185 // Since we have the reified name and type handy, add them to the result. 186 if (java_lang_invoke_MemberName::name(mname2) == NULL) 187 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 188 if (java_lang_invoke_MemberName::type(mname2) == NULL) 189 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 190 } 191 return mname2; 192 } 193 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 194 oop clazz = java_lang_reflect_Method::clazz(target_oop); 195 int slot = java_lang_reflect_Method::slot(target_oop); 196 Klass* k = java_lang_Class::as_Klass(clazz); 197 if (k != NULL && k->is_instance_klass()) { 198 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 199 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 200 return NULL; // do not resolve unless there is a concrete signature 201 CallInfo info(m, k, CHECK_NULL); 202 return init_method_MemberName(mname, info); 203 } 204 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 205 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 206 int slot = java_lang_reflect_Constructor::slot(target_oop); 207 Klass* k = java_lang_Class::as_Klass(clazz); 208 if (k != NULL && k->is_instance_klass()) { 209 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 210 if (m == NULL) return NULL; 211 CallInfo info(m, k, CHECK_NULL); 212 return init_method_MemberName(mname, info); 213 } 214 } 215 return NULL; 216 } 217 218 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 219 assert(info.resolved_appendix().is_null(), "only normal methods here"); 220 methodHandle m = info.resolved_method(); 221 assert(m.not_null(), "null method handle"); 222 InstanceKlass* m_klass = m->method_holder(); 223 assert(m_klass != NULL, "null holder for method handle"); 224 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 225 int vmindex = Method::invalid_vtable_index; 226 227 switch (info.call_kind()) { 228 case CallInfo::itable_call: 229 vmindex = info.itable_index(); 230 // More importantly, the itable index only works with the method holder. 231 assert(m_klass->verify_itable_index(vmindex), ""); 232 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 233 if (TraceInvokeDynamic) { 234 ttyLocker ttyl; 235 ResourceMark rm; 236 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 237 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 238 vmindex); 239 m->access_flags().print_on(tty); 240 if (!m->is_abstract()) { 241 if (!m->is_private()) { 242 tty->print("default"); 243 } 244 else { 245 tty->print("private-intf"); 246 } 247 } 248 tty->cr(); 249 } 250 break; 251 252 case CallInfo::vtable_call: 253 vmindex = info.vtable_index(); 254 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 255 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe"); 256 if (m_klass->is_interface()) { 257 // This is a vtable call to an interface method (abstract "miranda method" or default method). 258 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 259 // (LinkResolver should help us figure this out.) 260 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass"); 261 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass()); 262 if (m_klass_non_interface->is_interface()) { 263 m_klass_non_interface = SystemDictionary::Object_klass(); 264 #ifdef ASSERT 265 { ResourceMark rm; 266 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex); 267 assert(m->name() == m2->name() && m->signature() == m2->signature(), 268 "at %d, %s != %s", vmindex, 269 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 270 } 271 #endif //ASSERT 272 } 273 if (!m->is_public()) { 274 assert(m->is_public(), "virtual call must be to public interface method"); 275 return NULL; // elicit an error later in product build 276 } 277 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe"); 278 m_klass = m_klass_non_interface; 279 } 280 if (TraceInvokeDynamic) { 281 ttyLocker ttyl; 282 ResourceMark rm; 283 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 284 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 285 m_klass->internal_name(), vmindex); 286 m->access_flags().print_on(tty); 287 if (m->is_default_method()) { 288 tty->print("default"); 289 } 290 tty->cr(); 291 } 292 break; 293 294 case CallInfo::direct_call: 295 vmindex = Method::nonvirtual_vtable_index; 296 if (m->is_static()) { 297 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 298 } else if (m->is_initializer()) { 299 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 300 } else { 301 // "special" reflects that this is a direct call, not that it 302 // necessarily originates from an invokespecial. We can also do 303 // direct calls for private and/or final non-static methods. 304 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 305 } 306 break; 307 308 default: assert(false, "bad CallInfo"); return NULL; 309 } 310 311 // @CallerSensitive annotation detected 312 if (m->caller_sensitive()) { 313 flags |= CALLER_SENSITIVE; 314 } 315 316 Handle resolved_method = info.resolved_method_name(); 317 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(), 318 "Should not change after link resolution"); 319 320 oop mname_oop = mname(); 321 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 322 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method()); 323 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index 324 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror()); 325 // Note: name and type can be lazily computed by resolve_MemberName, 326 // if Java code needs them as resolved String and MethodType objects. 327 // If relevant, the vtable or itable value is stored as vmindex. 328 // This is done eagerly, since it is readily available without 329 // constructing any new objects. 330 return mname(); 331 } 332 333 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 334 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 335 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 336 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 337 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 338 339 oop mname_oop = mname(); 340 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 341 java_lang_invoke_MemberName::set_method (mname_oop, NULL); 342 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 343 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror()); 344 345 oop type = field_signature_type_or_null(fd.signature()); 346 oop name = field_name_or_null(fd.name()); 347 if (name != NULL) 348 java_lang_invoke_MemberName::set_name(mname_oop, name); 349 if (type != NULL) 350 java_lang_invoke_MemberName::set_type(mname_oop, type); 351 // Note: name and type can be lazily computed by resolve_MemberName, 352 // if Java code needs them as resolved String and Class objects. 353 // Note that the incoming type oop might be pre-resolved (non-null). 354 // The base clazz and field offset (vmindex) must be eagerly stored, 355 // because they unambiguously identify the field. 356 // Although the fieldDescriptor::_index would also identify the field, 357 // we do not use it, because it is harder to decode. 358 // TO DO: maybe intern mname_oop 359 return mname(); 360 } 361 362 // JVM 2.9 Special Methods: 363 // A method is signature polymorphic if and only if all of the following conditions hold : 364 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes. 365 // * It has a single formal parameter of type Object[]. 366 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. 367 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 368 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 369 if (klass == NULL) 370 return false; 371 // The following test will fail spuriously during bootstrap of MethodHandle itself: 372 // if (klass != SystemDictionary::MethodHandle_klass()) 373 // Test the name instead: 374 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() && 375 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { 376 return false; 377 } 378 379 // Look up signature polymorphic method with polymorphic return type 380 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 381 InstanceKlass* iklass = InstanceKlass::cast(klass); 382 Method* m = iklass->find_method(name, poly_sig); 383 if (m != NULL) { 384 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 385 int flags = m->access_flags().as_int(); 386 if ((flags & required) == required) { 387 return true; 388 } 389 } 390 391 // Look up signature polymorphic method with non-polymorphic (non Object) return type 392 int me; 393 int ms = iklass->find_method_by_name(name, &me); 394 if (ms == -1) return false; 395 for (; ms < me; ms++) { 396 Method* m = iklass->methods()->at(ms); 397 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 398 int flags = m->access_flags().as_int(); 399 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 400 return true; 401 } 402 } 403 return false; 404 } 405 406 407 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 408 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 409 switch (iid) { 410 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 411 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 412 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 413 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 414 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 415 default: 416 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 417 return 0; 418 } 419 } 420 421 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 422 switch(id) { 423 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 424 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 425 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 426 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 427 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 428 default: 429 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 430 return Bytecodes::_illegal; 431 } 432 } 433 434 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 435 switch (iid) { 436 case vmIntrinsics::_invokeBasic: return 0; 437 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 438 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 439 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 440 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 441 default: 442 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 443 return 0; 444 } 445 } 446 447 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 448 vmSymbols::SID name_id = vmSymbols::find_sid(name); 449 switch (name_id) { 450 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 451 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 452 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 453 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 454 455 // There is one static signature-polymorphic method for each JVM invocation mode. 456 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 457 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 458 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 459 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 460 default: break; 461 } 462 463 // Cover the case of invokeExact and any future variants of invokeFoo. 464 Klass* mh_klass = SystemDictionary::well_known_klass( 465 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 466 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) { 467 return vmIntrinsics::_invokeGeneric; 468 } 469 470 // Cover the case of methods on VarHandle. 471 Klass* vh_klass = SystemDictionary::well_known_klass( 472 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) ); 473 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) { 474 return vmIntrinsics::_invokeGeneric; 475 } 476 477 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 478 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 479 return vmIntrinsics::_none; 480 } 481 482 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 483 if (klass != NULL && 484 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() || 485 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { 486 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 487 if (iid != vmIntrinsics::_none) 488 return iid; 489 if (is_method_handle_invoke_name(klass, name)) 490 return vmIntrinsics::_invokeGeneric; 491 } 492 return vmIntrinsics::_none; 493 } 494 495 // Returns true if method is signature polymorphic and public 496 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) { 497 if (is_signature_polymorphic_name(klass, name)) { 498 InstanceKlass* iklass = InstanceKlass::cast(klass); 499 int me; 500 int ms = iklass->find_method_by_name(name, &me); 501 assert(ms != -1, ""); 502 for (; ms < me; ms++) { 503 Method* m = iklass->methods()->at(ms); 504 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC; 505 int flags = m->access_flags().as_int(); 506 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 507 return true; 508 } 509 } 510 } 511 return false; 512 } 513 514 // convert the external string or reflective type to an internal signature 515 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 516 if (java_lang_invoke_MethodType::is_instance(type_str)) { 517 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 518 } else if (java_lang_Class::is_instance(type_str)) { 519 return java_lang_Class::as_signature(type_str, false, THREAD); 520 } else if (java_lang_String::is_instance_inlined(type_str)) { 521 if (intern_if_not_found) { 522 return java_lang_String::as_symbol(type_str, THREAD); 523 } else { 524 return java_lang_String::as_symbol_or_null(type_str); 525 } 526 } else { 527 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 528 } 529 } 530 531 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 532 enum { OBJ_SIG_LEN = 18 }; 533 534 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 535 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 536 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 537 const int len = sig->utf8_length(); 538 for (int i = 0; i < len; i++) { 539 switch (sig->byte_at(i)) { 540 case 'L': 541 // only java/lang/Object is valid here 542 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 543 return false; 544 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 545 continue; 546 case '(': case ')': case 'V': 547 case 'I': case 'J': case 'F': case 'D': 548 continue; 549 //case '[': 550 //case 'Z': case 'B': case 'C': case 'S': 551 default: 552 return false; 553 } 554 } 555 return true; 556 } 557 558 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 559 Symbol* bsig = NULL; 560 if (sig == NULL) { 561 return sig; 562 } else if (is_basic_type_signature(sig)) { 563 sig->increment_refcount(); 564 return sig; // that was easy 565 } else if (sig->byte_at(0) != '(') { 566 BasicType bt = char2type(sig->byte_at(0)); 567 if (is_subword_type(bt)) { 568 bsig = vmSymbols::int_signature(); 569 } else { 570 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 571 bsig = vmSymbols::object_signature(); 572 } 573 } else { 574 ResourceMark rm; 575 stringStream buffer(128); 576 buffer.put('('); 577 int arg_pos = 0, keep_arg_pos = -1; 578 if (keep_last_arg) 579 keep_arg_pos = ArgumentCount(sig).size() - 1; 580 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 581 BasicType bt = ss.type(); 582 size_t this_arg_pos = buffer.size(); 583 if (ss.at_return_type()) { 584 buffer.put(')'); 585 } 586 if (arg_pos == keep_arg_pos) { 587 buffer.write((char*) ss.raw_bytes(), 588 (int) ss.raw_length()); 589 } else if (bt == T_OBJECT || bt == T_ARRAY) { 590 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 591 } else { 592 if (is_subword_type(bt)) 593 bt = T_INT; 594 buffer.put(type2char(bt)); 595 } 596 arg_pos++; 597 } 598 const char* sigstr = buffer.base(); 599 int siglen = (int) buffer.size(); 600 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 601 } 602 assert(is_basic_type_signature(bsig) || 603 // detune assert in case the injected argument is not a basic type: 604 keep_last_arg, ""); 605 return bsig; 606 } 607 608 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 609 Symbol* sig, 610 bool keep_arrays, 611 bool keep_basic_names) { 612 st = st ? st : tty; 613 int len = sig->utf8_length(); 614 int array = 0; 615 bool prev_type = false; 616 for (int i = 0; i < len; i++) { 617 char ch = sig->byte_at(i); 618 switch (ch) { 619 case '(': case ')': 620 prev_type = false; 621 st->put(ch); 622 continue; 623 case '[': 624 if (!keep_basic_names && keep_arrays) 625 st->put(ch); 626 array++; 627 continue; 628 case 'L': 629 { 630 if (prev_type) st->put(','); 631 int start = i+1, slash = start; 632 while (++i < len && (ch = sig->byte_at(i)) != ';') { 633 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 634 } 635 if (slash < i) start = slash; 636 if (!keep_basic_names) { 637 st->put('L'); 638 } else { 639 for (int j = start; j < i; j++) 640 st->put(sig->byte_at(j)); 641 prev_type = true; 642 } 643 break; 644 } 645 default: 646 { 647 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 648 ch = '['; 649 array = 0; 650 } 651 if (prev_type) st->put(','); 652 const char* n = NULL; 653 if (keep_basic_names) 654 n = type2name(char2type(ch)); 655 if (n == NULL) { 656 // unknown letter, or we don't want to know its name 657 st->put(ch); 658 } else { 659 st->print("%s", n); 660 prev_type = true; 661 } 662 break; 663 } 664 } 665 // Switch break goes here to take care of array suffix: 666 if (prev_type) { 667 while (array > 0) { 668 st->print("[]"); 669 --array; 670 } 671 } 672 array = 0; 673 } 674 } 675 676 677 678 static oop object_java_mirror() { 679 return SystemDictionary::Object_klass()->java_mirror(); 680 } 681 682 oop MethodHandles::field_name_or_null(Symbol* s) { 683 if (s == NULL) return NULL; 684 return StringTable::lookup(s); 685 } 686 687 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 688 if (s == NULL) return NULL; 689 BasicType bt = FieldType::basic_type(s); 690 if (is_java_primitive(bt)) { 691 assert(s->utf8_length() == 1, ""); 692 return java_lang_Class::primitive_mirror(bt); 693 } 694 // Here are some more short cuts for common types. 695 // They are optional, since reference types can be resolved lazily. 696 if (bt == T_OBJECT) { 697 if (s == vmSymbols::object_signature()) { 698 return object_java_mirror(); 699 } else if (s == vmSymbols::class_signature()) { 700 return SystemDictionary::Class_klass()->java_mirror(); 701 } else if (s == vmSymbols::string_signature()) { 702 return SystemDictionary::String_klass()->java_mirror(); 703 } 704 } 705 return NULL; 706 } 707 708 709 // An unresolved member name is a mere symbolic reference. 710 // Resolving it plants a vmtarget/vmindex in it, 711 // which refers directly to JVM internals. 712 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, 713 bool speculative_resolve, TRAPS) { 714 Handle empty; 715 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 716 717 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 718 // Already resolved. 719 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 720 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 721 return mname; 722 } 723 724 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 725 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 726 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 727 int flags = java_lang_invoke_MemberName::flags(mname()); 728 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 729 if (!ref_kind_is_valid(ref_kind)) { 730 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 731 } 732 733 DEBUG_ONLY(int old_vmindex); 734 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 735 736 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 737 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 738 } 739 740 InstanceKlass* defc = NULL; 741 { 742 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 743 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 744 if (!defc_klass->is_instance_klass()) { 745 if (!defc_klass->is_array_klass()) return empty; 746 defc_klass = SystemDictionary::Object_klass(); 747 } 748 defc = InstanceKlass::cast(defc_klass); 749 } 750 if (defc == NULL) { 751 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 752 } 753 defc->link_class(CHECK_(empty)); // possible safepoint 754 755 // convert the external string name to an internal symbol 756 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 757 if (name == NULL) return empty; // no such name 758 if (name == vmSymbols::class_initializer_name()) 759 return empty; // illegal name 760 761 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 762 if ((flags & ALL_KINDS) == IS_METHOD && 763 (defc == SystemDictionary::MethodHandle_klass() || defc == SystemDictionary::VarHandle_klass()) && 764 (ref_kind == JVM_REF_invokeVirtual || 765 ref_kind == JVM_REF_invokeSpecial || 766 // static invocation mode is required for _linkToVirtual, etc.: 767 ref_kind == JVM_REF_invokeStatic)) { 768 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 769 if (iid != vmIntrinsics::_none && 770 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 771 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 772 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 773 mh_invoke_id = iid; 774 } 775 } 776 777 // convert the external string or reflective type to an internal signature 778 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 779 if (type == NULL) return empty; // no such signature exists in the VM 780 781 LinkInfo::AccessCheck access_check = caller != NULL ? 782 LinkInfo::needs_access_check : 783 LinkInfo::skip_access_check; 784 785 // Time to do the lookup. 786 switch (flags & ALL_KINDS) { 787 case IS_METHOD: 788 { 789 CallInfo result; 790 LinkInfo link_info(defc, name, type, caller, access_check); 791 { 792 assert(!HAS_PENDING_EXCEPTION, ""); 793 if (ref_kind == JVM_REF_invokeStatic) { 794 LinkResolver::resolve_static_call(result, 795 link_info, false, THREAD); 796 } else if (ref_kind == JVM_REF_invokeInterface) { 797 LinkResolver::resolve_interface_call(result, Handle(), defc, 798 link_info, false, THREAD); 799 } else if (mh_invoke_id != vmIntrinsics::_none) { 800 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 801 LinkResolver::resolve_handle_call(result, link_info, THREAD); 802 } else if (ref_kind == JVM_REF_invokeSpecial) { 803 LinkResolver::resolve_special_call(result, Handle(), 804 link_info, THREAD); 805 } else if (ref_kind == JVM_REF_invokeVirtual) { 806 LinkResolver::resolve_virtual_call(result, Handle(), defc, 807 link_info, false, THREAD); 808 } else { 809 assert(false, "ref_kind=%d", ref_kind); 810 } 811 if (HAS_PENDING_EXCEPTION) { 812 if (speculative_resolve) { 813 CLEAR_PENDING_EXCEPTION; 814 } 815 return empty; 816 } 817 } 818 if (result.resolved_appendix().not_null()) { 819 // The resolved MemberName must not be accompanied by an appendix argument, 820 // since there is no way to bind this value into the MemberName. 821 // Caller is responsible to prevent this from happening. 822 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 823 } 824 result.set_resolved_method_name(CHECK_(empty)); 825 oop mname2 = init_method_MemberName(mname, result); 826 return Handle(THREAD, mname2); 827 } 828 case IS_CONSTRUCTOR: 829 { 830 CallInfo result; 831 LinkInfo link_info(defc, name, type, caller, access_check); 832 { 833 assert(!HAS_PENDING_EXCEPTION, ""); 834 if (name == vmSymbols::object_initializer_name()) { 835 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD); 836 } else { 837 break; // will throw after end of switch 838 } 839 if (HAS_PENDING_EXCEPTION) { 840 if (speculative_resolve) { 841 CLEAR_PENDING_EXCEPTION; 842 } 843 return empty; 844 } 845 } 846 assert(result.is_statically_bound(), ""); 847 result.set_resolved_method_name(CHECK_(empty)); 848 oop mname2 = init_method_MemberName(mname, result); 849 return Handle(THREAD, mname2); 850 } 851 case IS_FIELD: 852 { 853 fieldDescriptor result; // find_field initializes fd if found 854 { 855 assert(!HAS_PENDING_EXCEPTION, ""); 856 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check); 857 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 858 if (HAS_PENDING_EXCEPTION) { 859 if (speculative_resolve) { 860 CLEAR_PENDING_EXCEPTION; 861 } 862 return empty; 863 } 864 } 865 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 866 return Handle(THREAD, mname2); 867 } 868 default: 869 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 870 } 871 872 return empty; 873 } 874 875 // Conversely, a member name which is only initialized from JVM internals 876 // may have null defc, name, and type fields. 877 // Resolving it plants a vmtarget/vmindex in it, 878 // which refers directly to JVM internals. 879 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 880 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 881 882 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 883 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 884 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 885 int flags = java_lang_invoke_MemberName::flags(mname()); 886 887 if (suppress != 0) { 888 if (suppress & _suppress_defc) have_defc = true; 889 if (suppress & _suppress_name) have_name = true; 890 if (suppress & _suppress_type) have_type = true; 891 } 892 893 if (have_defc && have_name && have_type) return; // nothing needed 894 895 switch (flags & ALL_KINDS) { 896 case IS_METHOD: 897 case IS_CONSTRUCTOR: 898 { 899 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 900 if (vmtarget == NULL) { 901 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 902 } 903 methodHandle m(THREAD, vmtarget); 904 DEBUG_ONLY(vmtarget = NULL); // safety 905 if (!have_defc) { 906 InstanceKlass* defc = m->method_holder(); 907 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 908 } 909 if (!have_name) { 910 //not java_lang_String::create_from_symbol; let's intern member names 911 oop name = StringTable::intern(m->name(), CHECK); 912 java_lang_invoke_MemberName::set_name(mname(), name); 913 } 914 if (!have_type) { 915 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 916 java_lang_invoke_MemberName::set_type(mname(), type()); 917 } 918 return; 919 } 920 case IS_FIELD: 921 { 922 oop clazz = java_lang_invoke_MemberName::clazz(mname()); 923 if (clazz == NULL) { 924 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)"); 925 } 926 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz)); 927 DEBUG_ONLY(clazz = NULL); // safety 928 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 929 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 930 fieldDescriptor fd; // find_field initializes fd if found 931 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 932 break; // cannot expand 933 if (!have_name) { 934 //not java_lang_String::create_from_symbol; let's intern member names 935 oop name = StringTable::intern(fd.name(), CHECK); 936 java_lang_invoke_MemberName::set_name(mname(), name); 937 } 938 if (!have_type) { 939 // If it is a primitive field type, don't mess with short strings like "I". 940 Handle type (THREAD, field_signature_type_or_null(fd.signature())); 941 if (type.is_null()) { 942 type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 943 } 944 java_lang_invoke_MemberName::set_type(mname(), type()); 945 } 946 return; 947 } 948 } 949 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 950 } 951 952 int MethodHandles::find_MemberNames(Klass* k, 953 Symbol* name, Symbol* sig, 954 int mflags, Klass* caller, 955 int skip, objArrayHandle results, TRAPS) { 956 // %%% take caller into account! 957 958 Thread* thread = Thread::current(); 959 960 if (k == NULL || !k->is_instance_klass()) return -1; 961 962 int rfill = 0, rlimit = results->length(), rskip = skip; 963 // overflow measurement: 964 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 965 966 int match_flags = mflags; 967 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 968 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 969 bool local_only = !(search_superc | search_intfc); 970 bool classes_only = false; 971 972 if (name != NULL) { 973 if (name->utf8_length() == 0) return 0; // a match is not possible 974 } 975 if (sig != NULL) { 976 if (sig->utf8_length() == 0) return 0; // a match is not possible 977 if (sig->byte_at(0) == '(') 978 match_flags &= ~(IS_FIELD | IS_TYPE); 979 else 980 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 981 } 982 983 if ((match_flags & IS_TYPE) != 0) { 984 // NYI, and Core Reflection works quite well for this query 985 } 986 987 if ((match_flags & IS_FIELD) != 0) { 988 InstanceKlass* ik = InstanceKlass::cast(k); 989 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 990 if (name != NULL && st.name() != name) 991 continue; 992 if (sig != NULL && st.signature() != sig) 993 continue; 994 // passed the filters 995 if (rskip > 0) { 996 --rskip; 997 } else if (rfill < rlimit) { 998 Handle result(thread, results->obj_at(rfill++)); 999 if (!java_lang_invoke_MemberName::is_instance(result())) 1000 return -99; // caller bug! 1001 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 1002 if (!oopDesc::equals(saved, result())) 1003 results->obj_at_put(rfill-1, saved); // show saved instance to user 1004 } else if (++overflow >= overflow_limit) { 1005 match_flags = 0; break; // got tired of looking at overflow 1006 } 1007 } 1008 } 1009 1010 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 1011 // watch out for these guys: 1012 Symbol* init_name = vmSymbols::object_initializer_name(); 1013 Symbol* clinit_name = vmSymbols::class_initializer_name(); 1014 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 1015 bool negate_name_test = false; 1016 // fix name so that it captures the intention of IS_CONSTRUCTOR 1017 if (!(match_flags & IS_METHOD)) { 1018 // constructors only 1019 if (name == NULL) { 1020 name = init_name; 1021 } else if (name != init_name) { 1022 return 0; // no constructors of this method name 1023 } 1024 } else if (!(match_flags & IS_CONSTRUCTOR)) { 1025 // methods only 1026 if (name == NULL) { 1027 name = init_name; 1028 negate_name_test = true; // if we see the name, we *omit* the entry 1029 } else if (name == init_name) { 1030 return 0; // no methods of this constructor name 1031 } 1032 } else { 1033 // caller will accept either sort; no need to adjust name 1034 } 1035 InstanceKlass* ik = InstanceKlass::cast(k); 1036 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 1037 Method* m = st.method(); 1038 Symbol* m_name = m->name(); 1039 if (m_name == clinit_name) 1040 continue; 1041 if (name != NULL && ((m_name != name) ^ negate_name_test)) 1042 continue; 1043 if (sig != NULL && m->signature() != sig) 1044 continue; 1045 // passed the filters 1046 if (rskip > 0) { 1047 --rskip; 1048 } else if (rfill < rlimit) { 1049 Handle result(thread, results->obj_at(rfill++)); 1050 if (!java_lang_invoke_MemberName::is_instance(result())) 1051 return -99; // caller bug! 1052 CallInfo info(m, NULL, CHECK_0); 1053 oop saved = MethodHandles::init_method_MemberName(result, info); 1054 if (!oopDesc::equals(saved, result())) 1055 results->obj_at_put(rfill-1, saved); // show saved instance to user 1056 } else if (++overflow >= overflow_limit) { 1057 match_flags = 0; break; // got tired of looking at overflow 1058 } 1059 } 1060 } 1061 1062 // return number of elements we at leasted wanted to initialize 1063 return rfill + overflow; 1064 } 1065 1066 // Is it safe to remove stale entries from a dependency list? 1067 static bool safe_to_expunge() { 1068 // Since parallel GC threads can concurrently iterate over a dependency 1069 // list during safepoint, it is safe to remove entries only when 1070 // CodeCache lock is held. 1071 return CodeCache_lock->owned_by_self(); 1072 } 1073 1074 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 1075 assert_locked_or_safepoint(CodeCache_lock); 1076 1077 oop context = java_lang_invoke_CallSite::context(call_site); 1078 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1079 // Try to purge stale entries on updates. 1080 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 1081 // in order to avoid memory leak, stale entries are purged whenever a dependency list 1082 // is changed (both on addition and removal). Though memory reclamation is delayed, 1083 // it avoids indefinite memory usage growth. 1084 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 1085 } 1086 1087 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 1088 assert_locked_or_safepoint(CodeCache_lock); 1089 1090 oop context = java_lang_invoke_CallSite::context(call_site); 1091 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1092 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 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 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1103 1104 oop context = java_lang_invoke_CallSite::context(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 VM_Deoptimize op; 1111 VMThread::execute(&op); 1112 } 1113 } 1114 1115 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) { 1116 if (TraceMethodHandles) { 1117 const char* name = vmIntrinsics::name_at(iid); 1118 if (*name == '_') name += 1; 1119 const size_t len = strlen(name) + 50; 1120 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal); 1121 const char* suffix = ""; 1122 if (is_signature_polymorphic(iid)) { 1123 if (is_signature_polymorphic_static(iid)) 1124 suffix = "/static"; 1125 else 1126 suffix = "/private"; 1127 } 1128 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix); 1129 trace_method_handle(_masm, qname); 1130 // Note: Don't free the allocated char array because it's used 1131 // during runtime. 1132 } 1133 } 1134 1135 // 1136 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1137 // They are the private interface between this JVM and the HotSpot-specific 1138 // Java code that implements JSR 292 method handles. 1139 // 1140 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1141 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1142 // 1143 1144 #ifndef PRODUCT 1145 #define EACH_NAMED_CON(template, requirement) \ 1146 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1147 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1148 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1149 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1150 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1151 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1152 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1153 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1154 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1155 /*end*/ 1156 1157 #define IGNORE_REQ(req_expr) /* req_expr */ 1158 #define ONE_PLUS(scope,value) 1+ 1159 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1160 #define VALUE_COMMA(scope,value) scope::value, 1161 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1162 #define STRING_NULL(scope,value) #value "\0" 1163 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1164 1165 static bool advertise_con_value(int which) { 1166 if (which < 0) return false; 1167 bool ok = true; 1168 int count = 0; 1169 #define INC_COUNT(scope,value) \ 1170 ++count; 1171 #define CHECK_REQ(req_expr) \ 1172 if (which < count) return ok; \ 1173 ok = (req_expr); 1174 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1175 #undef INC_COUNT 1176 #undef CHECK_REQ 1177 assert(count == con_value_count, ""); 1178 if (which < count) return ok; 1179 return false; 1180 } 1181 1182 #undef ONE_PLUS 1183 #undef VALUE_COMMA 1184 #undef STRING_NULL 1185 #undef EACH_NAMED_CON 1186 #endif // PRODUCT 1187 1188 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1189 #ifndef PRODUCT 1190 if (advertise_con_value(which)) { 1191 assert(which >= 0 && which < con_value_count, ""); 1192 int con = con_values[which]; 1193 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1194 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1195 const char* str = &con_names[0]; 1196 for (int i = 0; i < which; i++) 1197 str += strlen(str) + 1; // skip name and null 1198 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1199 box->obj_at_put(0, name); 1200 } 1201 return con; 1202 } 1203 #endif 1204 return 0; 1205 } 1206 JVM_END 1207 1208 // void init(MemberName self, AccessibleObject ref) 1209 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1210 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1211 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1212 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1213 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1214 MethodHandles::init_MemberName(mname, target, CHECK); 1215 } 1216 JVM_END 1217 1218 // void expand(MemberName self) 1219 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1220 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1221 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1222 MethodHandles::expand_MemberName(mname, 0, CHECK); 1223 } 1224 JVM_END 1225 1226 // void resolve(MemberName self, Class<?> caller) 1227 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh, 1228 jboolean speculative_resolve)) { 1229 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1230 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1231 1232 // The trusted Java code that calls this method should already have performed 1233 // access checks on behalf of the given caller. But, we can verify this. 1234 if (VerifyMethodHandles && caller_jh != NULL && 1235 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1236 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1237 if (reference_klass != NULL && reference_klass->is_objArray_klass()) { 1238 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1239 } 1240 1241 // Reflection::verify_class_access can only handle instance classes. 1242 if (reference_klass != NULL && reference_klass->is_instance_klass()) { 1243 // Emulate LinkResolver::check_klass_accessability. 1244 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1245 if (caller != SystemDictionary::Object_klass() 1246 && Reflection::verify_class_access(caller, 1247 InstanceKlass::cast(reference_klass), 1248 true) != Reflection::ACCESS_OK) { 1249 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1250 } 1251 } 1252 } 1253 1254 Klass* caller = caller_jh == NULL ? NULL : 1255 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1256 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE, 1257 CHECK_NULL); 1258 1259 if (resolved.is_null()) { 1260 int flags = java_lang_invoke_MemberName::flags(mname()); 1261 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1262 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1263 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1264 } 1265 if (speculative_resolve) { 1266 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively"); 1267 return NULL; 1268 } 1269 if ((flags & ALL_KINDS) == IS_FIELD) { 1270 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed"); 1271 } else if ((flags & ALL_KINDS) == IS_METHOD || 1272 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1273 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed"); 1274 } else { 1275 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1276 } 1277 } 1278 1279 return JNIHandles::make_local(THREAD, resolved()); 1280 } 1281 JVM_END 1282 1283 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1284 if (mname == NULL || 1285 java_lang_invoke_MemberName::clazz(mname) == NULL) { 1286 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1287 } else { 1288 int flags = java_lang_invoke_MemberName::flags(mname); 1289 if ((flags & IS_FIELD) != 0 && 1290 (must_be_static 1291 ? (flags & JVM_ACC_STATIC) != 0 1292 : (flags & JVM_ACC_STATIC) == 0)) { 1293 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1294 return (jlong) vmindex; 1295 } 1296 } 1297 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1298 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1299 return 0; 1300 } 1301 1302 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1303 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1304 } 1305 JVM_END 1306 1307 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1308 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1309 } 1310 JVM_END 1311 1312 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1313 // use the other function to perform sanity checks: 1314 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1315 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1316 return JNIHandles::make_local(THREAD, clazz); 1317 } 1318 JVM_END 1319 1320 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1321 if (mname_jh == NULL) return NULL; 1322 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1323 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1324 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1325 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1326 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1327 result->obj_at_put(0, x); 1328 1329 int flags = java_lang_invoke_MemberName::flags(mname()); 1330 if ((flags & IS_FIELD) != 0) { 1331 x = java_lang_invoke_MemberName::clazz(mname()); 1332 } else { 1333 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1334 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method"); 1335 x = mname(); 1336 } 1337 result->obj_at_put(1, x); 1338 return JNIHandles::make_local(env, result()); 1339 } 1340 JVM_END 1341 1342 1343 1344 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1345 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1346 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1347 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1348 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1349 if (clazz_jh == NULL || results_jh == NULL) return -1; 1350 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)); 1351 1352 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1353 if (results.is_null() || !results->is_objArray()) return -1; 1354 1355 TempNewSymbol name = NULL; 1356 TempNewSymbol sig = NULL; 1357 if (name_jh != NULL) { 1358 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1359 if (name == NULL) return 0; // a match is not possible 1360 } 1361 if (sig_jh != NULL) { 1362 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1363 if (sig == NULL) return 0; // a match is not possible 1364 } 1365 1366 Klass* caller = NULL; 1367 if (caller_jh != NULL) { 1368 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1369 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1370 caller = java_lang_Class::as_Klass(caller_oop); 1371 } 1372 1373 if (name != NULL && sig != NULL && results.not_null()) { 1374 // try a direct resolve 1375 // %%% TO DO 1376 } 1377 1378 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1379 caller, skip, results, CHECK_0); 1380 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1381 return res; 1382 } 1383 JVM_END 1384 1385 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1386 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1387 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1388 { 1389 // Walk all nmethods depending on this call site. 1390 MutexLocker mu(Compile_lock, thread); 1391 MethodHandles::flush_dependent_nmethods(call_site, target); 1392 java_lang_invoke_CallSite::set_target(call_site(), target()); 1393 } 1394 } 1395 JVM_END 1396 1397 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1398 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1399 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1400 { 1401 // Walk all nmethods depending on this call site. 1402 MutexLocker mu(Compile_lock, thread); 1403 MethodHandles::flush_dependent_nmethods(call_site, target); 1404 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1405 } 1406 } 1407 JVM_END 1408 1409 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls, 1410 jobject caller_jh, jintArray index_info_jh, 1411 jint start, jint end, 1412 jobjectArray buf_jh, jint pos, 1413 jboolean resolve, jobject ifna_jh)) { 1414 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh)); 1415 if (caller_k == NULL || !caller_k->is_instance_klass()) { 1416 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller"); 1417 } 1418 InstanceKlass* caller = InstanceKlass::cast(caller_k); 1419 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh); 1420 if (index_info_oop == NULL || 1421 index_info_oop->klass() != Universe::intArrayKlassObj() || 1422 typeArrayOop(index_info_oop)->length() < 2) { 1423 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)"); 1424 } 1425 typeArrayHandle index_info(THREAD, index_info_oop); 1426 int bss_index_in_pool = index_info->int_at(1); 1427 // While we are here, take a quick look at the index info: 1428 if (bss_index_in_pool <= 0 || 1429 bss_index_in_pool >= caller->constants()->length() || 1430 index_info->int_at(0) 1431 != caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool)) { 1432 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)"); 1433 } 1434 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh)); 1435 if (start < 0) { 1436 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) { 1437 if (start == pseudo_index) { 1438 if (start >= end || 0 > pos || pos >= buf->length()) break; 1439 oop pseudo_arg = NULL; 1440 switch (pseudo_index) { 1441 case -4: // bootstrap method 1442 { 1443 int bsm_index = caller->constants()->invoke_dynamic_bootstrap_method_ref_index_at(bss_index_in_pool); 1444 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK); 1445 break; 1446 } 1447 case -3: // name 1448 { 1449 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool); 1450 Handle str = java_lang_String::create_from_symbol(name, CHECK); 1451 pseudo_arg = str(); 1452 break; 1453 } 1454 case -2: // type 1455 { 1456 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool); 1457 Handle th; 1458 if (type->byte_at(0) == '(') { 1459 th = SystemDictionary::find_method_handle_type(type, caller, CHECK); 1460 } else { 1461 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK); 1462 } 1463 pseudo_arg = th(); 1464 break; 1465 } 1466 case -1: // argument count 1467 { 1468 int argc = caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool); 1469 jvalue argc_value; argc_value.i = (jint)argc; 1470 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK); 1471 break; 1472 } 1473 } 1474 1475 // Store the pseudo-argument, and advance the pointers. 1476 buf->obj_at_put(pos++, pseudo_arg); 1477 ++start; 1478 } 1479 } 1480 // When we are done with this there may be regular arguments to process too. 1481 } 1482 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh)); 1483 caller->constants()-> 1484 copy_bootstrap_arguments_at(bss_index_in_pool, 1485 start, end, buf, pos, 1486 (resolve == JNI_TRUE), ifna, CHECK); 1487 } 1488 JVM_END 1489 1490 // It is called by a Cleaner object which ensures that dropped CallSites properly 1491 // deallocate their dependency information. 1492 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1493 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1494 { 1495 // Walk all nmethods depending on this call site. 1496 MutexLocker mu1(Compile_lock, thread); 1497 1498 int marked = 0; 1499 { 1500 NoSafepointVerifier nsv; 1501 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1502 assert(safe_to_expunge(), "removal is not safe"); 1503 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1504 marked = deps.remove_all_dependents(); 1505 } 1506 if (marked > 0) { 1507 // At least one nmethod has been marked for deoptimization 1508 VM_Deoptimize op; 1509 VMThread::execute(&op); 1510 } 1511 } 1512 } 1513 JVM_END 1514 1515 /** 1516 * Throws a java/lang/UnsupportedOperationException unconditionally. 1517 * This is required by the specification of MethodHandle.invoke if 1518 * invoked directly. 1519 */ 1520 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1521 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1522 return NULL; 1523 } 1524 JVM_END 1525 1526 /** 1527 * Throws a java/lang/UnsupportedOperationException unconditionally. 1528 * This is required by the specification of MethodHandle.invokeExact if 1529 * invoked directly. 1530 */ 1531 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1532 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1533 return NULL; 1534 } 1535 JVM_END 1536 1537 /// JVM_RegisterMethodHandleMethods 1538 1539 #undef CS // Solaris builds complain 1540 1541 #define LANG "Ljava/lang/" 1542 #define JLINV "Ljava/lang/invoke/" 1543 1544 #define OBJ LANG "Object;" 1545 #define CLS LANG "Class;" 1546 #define STRG LANG "String;" 1547 #define CS JLINV "CallSite;" 1548 #define MT JLINV "MethodType;" 1549 #define MH JLINV "MethodHandle;" 1550 #define MEM JLINV "MemberName;" 1551 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1552 1553 #define CC (char*) /*cast a literal from (const char*)*/ 1554 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1555 1556 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1557 static JNINativeMethod MHN_methods[] = { 1558 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1559 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1560 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)}, 1561 // static native int getNamedCon(int which, Object[] name) 1562 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1563 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1564 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1565 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1566 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1567 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1568 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1569 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)}, 1570 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1571 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1572 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1573 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1574 }; 1575 1576 static JNINativeMethod MH_methods[] = { 1577 // UnsupportedOperationException throwers 1578 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1579 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1580 }; 1581 1582 /** 1583 * This one function is exported, used by NativeLookup. 1584 */ 1585 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1586 assert(!MethodHandles::enabled(), "must not be enabled"); 1587 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 1588 1589 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1590 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror); 1591 1592 { 1593 ThreadToNativeFromVM ttnfv(thread); 1594 1595 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1596 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1597 "register java.lang.invoke.MethodHandleNative natives"); 1598 1599 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1600 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1601 "register java.lang.invoke.MethodHandle natives"); 1602 } 1603 1604 if (TraceInvokeDynamic) { 1605 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1606 } 1607 1608 MethodHandles::set_enabled(true); 1609 } 1610 JVM_END