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