1 /* 2 * Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaClasses.inline.hpp" 27 #include "classfile/stringTable.hpp" 28 #include "classfile/symbolTable.hpp" 29 #include "code/codeCache.hpp" 30 #include "code/dependencyContext.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "interpreter/interpreter.hpp" 33 #include "interpreter/oopMapCache.hpp" 34 #include "interpreter/linkResolver.hpp" 35 #include "memory/allocation.inline.hpp" 36 #include "memory/oopFactory.hpp" 37 #include "memory/resourceArea.hpp" 38 #include "memory/universe.hpp" 39 #include "oops/objArrayKlass.hpp" 40 #include "oops/objArrayOop.inline.hpp" 41 #include "oops/oop.inline.hpp" 42 #include "oops/typeArrayOop.inline.hpp" 43 #include "prims/methodHandles.hpp" 44 #include "runtime/deoptimization.hpp" 45 #include "runtime/fieldDescriptor.inline.hpp" 46 #include "runtime/handles.inline.hpp" 47 #include "runtime/interfaceSupport.inline.hpp" 48 #include "runtime/javaCalls.hpp" 49 #include "runtime/jniHandles.inline.hpp" 50 #include "runtime/timerTrace.hpp" 51 #include "runtime/reflection.hpp" 52 #include "runtime/safepointVerifiers.hpp" 53 #include "runtime/signature.hpp" 54 #include "runtime/stubRoutines.hpp" 55 #include "utilities/exceptions.hpp" 56 57 58 /* 59 * JSR 292 reference implementation: method handles 60 * The JDK 7 reference implementation represented method handle 61 * combinations as chains. Each link in the chain had a "vmentry" 62 * field which pointed at a bit of assembly code which performed 63 * one transformation before dispatching to the next link in the chain. 64 * 65 * The current reference implementation pushes almost all code generation 66 * responsibility to (trusted) Java code. A method handle contains a 67 * pointer to its "LambdaForm", which embodies all details of the method 68 * handle's behavior. The LambdaForm is a normal Java object, managed 69 * by a runtime coded in Java. 70 */ 71 72 bool MethodHandles::_enabled = false; // set true after successful native linkage 73 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 74 75 /** 76 * Generates method handle adapters. Returns 'false' if memory allocation 77 * failed and true otherwise. 78 */ 79 void MethodHandles::generate_adapters() { 80 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 81 assert(_adapter_code == NULL, "generate only once"); 82 83 ResourceMark rm; 84 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime)); 85 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 86 CodeBuffer code(_adapter_code); 87 MethodHandlesAdapterGenerator g(&code); 88 g.generate(); 89 code.log_section_sizes("MethodHandlesAdapterBlob"); 90 } 91 92 //------------------------------------------------------------------------------ 93 // MethodHandlesAdapterGenerator::generate 94 // 95 void MethodHandlesAdapterGenerator::generate() { 96 // Generate generic method handle adapters. 97 // Generate interpreter entries 98 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 99 mk <= Interpreter::method_handle_invoke_LAST; 100 mk = Interpreter::MethodKind(1 + (int)mk)) { 101 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 102 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 103 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 104 if (entry != NULL) { 105 Interpreter::set_entry_for_kind(mk, entry); 106 } 107 // If the entry is not set, it will throw AbstractMethodError. 108 } 109 } 110 111 void MethodHandles::set_enabled(bool z) { 112 if (_enabled != z) { 113 guarantee(z, "can only enable once"); 114 _enabled = z; 115 } 116 } 117 118 // MemberName support 119 120 // import java_lang_invoke_MemberName.* 121 enum { 122 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 123 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 124 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 125 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 126 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 127 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 128 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 129 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 130 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 131 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 132 }; 133 134 int MethodHandles::ref_kind_to_flags(int ref_kind) { 135 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind); 136 int flags = (ref_kind << REFERENCE_KIND_SHIFT); 137 if (ref_kind_is_field(ref_kind)) { 138 flags |= IS_FIELD; 139 } else if (ref_kind_is_method(ref_kind)) { 140 flags |= IS_METHOD; 141 } else if (ref_kind == JVM_REF_newInvokeSpecial) { 142 flags |= IS_CONSTRUCTOR; 143 } 144 return flags; 145 } 146 147 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) { 148 Handle empty; 149 Handle type(THREAD, java_lang_invoke_MemberName::type(mname())); 150 if (!java_lang_String::is_instance_inlined(type())) { 151 return type; // already resolved 152 } 153 Symbol* signature = java_lang_String::as_symbol_or_null(type()); 154 if (signature == NULL) { 155 return empty; // no such signature exists in the VM 156 } 157 Handle resolved; 158 int flags = java_lang_invoke_MemberName::flags(mname()); 159 switch (flags & ALL_KINDS) { 160 case IS_METHOD: 161 case IS_CONSTRUCTOR: 162 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty)); 163 break; 164 case IS_FIELD: 165 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty)); 166 break; 167 default: 168 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 169 } 170 if (resolved.is_null()) { 171 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty); 172 } 173 return resolved; 174 } 175 176 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) { 177 // This method is used from java.lang.invoke.MemberName constructors. 178 // It fills in the new MemberName from a java.lang.reflect.Member. 179 Thread* thread = Thread::current(); 180 oop target_oop = target(); 181 Klass* target_klass = target_oop->klass(); 182 if (target_klass == SystemDictionary::reflect_Field_klass()) { 183 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 184 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 185 Klass* k = java_lang_Class::as_Klass(clazz); 186 if (k != NULL && k->is_instance_klass()) { 187 fieldDescriptor fd(InstanceKlass::cast(k), slot); 188 oop mname2 = init_field_MemberName(mname, fd); 189 if (mname2 != NULL) { 190 // Since we have the reified name and type handy, add them to the result. 191 if (java_lang_invoke_MemberName::name(mname2) == NULL) 192 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 193 if (java_lang_invoke_MemberName::type(mname2) == NULL) 194 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 195 } 196 return mname2; 197 } 198 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 199 oop clazz = java_lang_reflect_Method::clazz(target_oop); 200 int slot = java_lang_reflect_Method::slot(target_oop); 201 Klass* k = java_lang_Class::as_Klass(clazz); 202 if (k != NULL && k->is_instance_klass()) { 203 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 204 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 205 return NULL; // do not resolve unless there is a concrete signature 206 CallInfo info(m, k, CHECK_NULL); 207 return init_method_MemberName(mname, info); 208 } 209 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 210 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 211 int slot = java_lang_reflect_Constructor::slot(target_oop); 212 Klass* k = java_lang_Class::as_Klass(clazz); 213 if (k != NULL && k->is_instance_klass()) { 214 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 215 if (m == NULL) return NULL; 216 CallInfo info(m, k, CHECK_NULL); 217 return init_method_MemberName(mname, info); 218 } 219 } 220 return NULL; 221 } 222 223 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 224 assert(info.resolved_appendix().is_null(), "only normal methods here"); 225 methodHandle m(Thread::current(), info.resolved_method()); 226 assert(m.not_null(), "null method handle"); 227 InstanceKlass* m_klass = m->method_holder(); 228 assert(m_klass != NULL, "null holder for method handle"); 229 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 230 int vmindex = Method::invalid_vtable_index; 231 232 switch (info.call_kind()) { 233 case CallInfo::itable_call: 234 vmindex = info.itable_index(); 235 // More importantly, the itable index only works with the method holder. 236 assert(m_klass->verify_itable_index(vmindex), ""); 237 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 238 if (TraceInvokeDynamic) { 239 ttyLocker ttyl; 240 ResourceMark rm; 241 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 242 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 243 vmindex); 244 m->access_flags().print_on(tty); 245 if (!m->is_abstract()) { 246 if (!m->is_private()) { 247 tty->print("default"); 248 } 249 else { 250 tty->print("private-intf"); 251 } 252 } 253 tty->cr(); 254 } 255 break; 256 257 case CallInfo::vtable_call: 258 vmindex = info.vtable_index(); 259 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 260 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe"); 261 if (m_klass->is_interface()) { 262 // This is a vtable call to an interface method (abstract "miranda method" or default method). 263 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 264 // (LinkResolver should help us figure this out.) 265 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass"); 266 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass()); 267 if (m_klass_non_interface->is_interface()) { 268 m_klass_non_interface = SystemDictionary::Object_klass(); 269 #ifdef ASSERT 270 { ResourceMark rm; 271 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex); 272 assert(m->name() == m2->name() && m->signature() == m2->signature(), 273 "at %d, %s != %s", vmindex, 274 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 275 } 276 #endif //ASSERT 277 } 278 if (!m->is_public()) { 279 assert(m->is_public(), "virtual call must be to public interface method"); 280 return NULL; // elicit an error later in product build 281 } 282 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe"); 283 m_klass = m_klass_non_interface; 284 } 285 if (TraceInvokeDynamic) { 286 ttyLocker ttyl; 287 ResourceMark rm; 288 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 289 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 290 m_klass->internal_name(), vmindex); 291 m->access_flags().print_on(tty); 292 if (m->is_default_method()) { 293 tty->print("default"); 294 } 295 tty->cr(); 296 } 297 break; 298 299 case CallInfo::direct_call: 300 vmindex = Method::nonvirtual_vtable_index; 301 if (m->is_static()) { 302 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 303 } else if (m->is_initializer()) { 304 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 305 } else { 306 // "special" reflects that this is a direct call, not that it 307 // necessarily originates from an invokespecial. We can also do 308 // direct calls for private and/or final non-static methods. 309 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 310 } 311 break; 312 313 default: assert(false, "bad CallInfo"); return NULL; 314 } 315 316 // @CallerSensitive annotation detected 317 if (m->caller_sensitive()) { 318 flags |= CALLER_SENSITIVE; 319 } 320 321 Handle resolved_method = info.resolved_method_name(); 322 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(), 323 "Should not change after link resolution"); 324 325 oop mname_oop = mname(); 326 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 327 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method()); 328 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index 329 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror()); 330 // Note: name and type can be lazily computed by resolve_MemberName, 331 // if Java code needs them as resolved String and MethodType objects. 332 // If relevant, the vtable or itable value is stored as vmindex. 333 // This is done eagerly, since it is readily available without 334 // constructing any new objects. 335 return mname(); 336 } 337 338 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 339 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 340 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 341 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 342 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 343 344 oop mname_oop = mname(); 345 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 346 java_lang_invoke_MemberName::set_method (mname_oop, NULL); 347 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 348 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror()); 349 350 oop type = field_signature_type_or_null(fd.signature()); 351 oop name = field_name_or_null(fd.name()); 352 if (name != NULL) 353 java_lang_invoke_MemberName::set_name(mname_oop, name); 354 if (type != NULL) 355 java_lang_invoke_MemberName::set_type(mname_oop, type); 356 // Note: name and type can be lazily computed by resolve_MemberName, 357 // if Java code needs them as resolved String and Class objects. 358 // Note that the incoming type oop might be pre-resolved (non-null). 359 // The base clazz and field offset (vmindex) must be eagerly stored, 360 // because they unambiguously identify the field. 361 // Although the fieldDescriptor::_index would also identify the field, 362 // we do not use it, because it is harder to decode. 363 // TO DO: maybe intern mname_oop 364 return mname(); 365 } 366 367 // JVM 2.9 Special Methods: 368 // A method is signature polymorphic if and only if all of the following conditions hold : 369 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes. 370 // * It has a single formal parameter of type Object[]. 371 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. 372 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 373 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 374 if (klass == NULL) 375 return false; 376 // The following test will fail spuriously during bootstrap of MethodHandle itself: 377 // if (klass != SystemDictionary::MethodHandle_klass()) 378 // Test the name instead: 379 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() && 380 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { 381 return false; 382 } 383 384 // Look up signature polymorphic method with polymorphic return type 385 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 386 InstanceKlass* iklass = InstanceKlass::cast(klass); 387 Method* m = iklass->find_method(name, poly_sig); 388 if (m != NULL) { 389 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 390 int flags = m->access_flags().as_int(); 391 if ((flags & required) == required) { 392 return true; 393 } 394 } 395 396 // Look up signature polymorphic method with non-polymorphic (non Object) return type 397 int me; 398 int ms = iklass->find_method_by_name(name, &me); 399 if (ms == -1) return false; 400 for (; ms < me; ms++) { 401 Method* m = iklass->methods()->at(ms); 402 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 403 int flags = m->access_flags().as_int(); 404 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 405 return true; 406 } 407 } 408 return false; 409 } 410 411 412 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 413 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 414 switch (iid) { 415 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 416 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 417 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 418 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 419 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 420 default: 421 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 422 return 0; 423 } 424 } 425 426 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 427 switch(id) { 428 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 429 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 430 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 431 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 432 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 433 default: 434 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 435 return Bytecodes::_illegal; 436 } 437 } 438 439 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 440 switch (iid) { 441 case vmIntrinsics::_invokeBasic: return 0; 442 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 443 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 444 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 445 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 446 default: 447 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 448 return 0; 449 } 450 } 451 452 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 453 vmSymbols::SID name_id = vmSymbols::find_sid(name); 454 switch (name_id) { 455 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 456 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 457 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 458 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 459 460 // There is one static signature-polymorphic method for each JVM invocation mode. 461 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 462 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 463 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 464 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 465 default: break; 466 } 467 468 // Cover the case of invokeExact and any future variants of invokeFoo. 469 Klass* mh_klass = SystemDictionary::well_known_klass( 470 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 471 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) { 472 return vmIntrinsics::_invokeGeneric; 473 } 474 475 // Cover the case of methods on VarHandle. 476 Klass* vh_klass = SystemDictionary::well_known_klass( 477 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) ); 478 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) { 479 return vmIntrinsics::_invokeGeneric; 480 } 481 482 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 483 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 484 return vmIntrinsics::_none; 485 } 486 487 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 488 if (klass != NULL && 489 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() || 490 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { 491 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 492 if (iid != vmIntrinsics::_none) 493 return iid; 494 if (is_method_handle_invoke_name(klass, name)) 495 return vmIntrinsics::_invokeGeneric; 496 } 497 return vmIntrinsics::_none; 498 } 499 500 // Returns true if method is signature polymorphic and public 501 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) { 502 if (is_signature_polymorphic_name(klass, name)) { 503 InstanceKlass* iklass = InstanceKlass::cast(klass); 504 int me; 505 int ms = iklass->find_method_by_name(name, &me); 506 assert(ms != -1, ""); 507 for (; ms < me; ms++) { 508 Method* m = iklass->methods()->at(ms); 509 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC; 510 int flags = m->access_flags().as_int(); 511 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 512 return true; 513 } 514 } 515 } 516 return false; 517 } 518 519 // convert the external string or reflective type to an internal signature 520 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 521 if (java_lang_invoke_MethodType::is_instance(type_str)) { 522 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found); 523 } else if (java_lang_Class::is_instance(type_str)) { 524 return java_lang_Class::as_signature(type_str, false); 525 } else if (java_lang_String::is_instance_inlined(type_str)) { 526 if (intern_if_not_found) { 527 return java_lang_String::as_symbol(type_str); 528 } else { 529 return java_lang_String::as_symbol_or_null(type_str); 530 } 531 } else { 532 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 533 } 534 } 535 536 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 537 enum { OBJ_SIG_LEN = 18 }; 538 539 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 540 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 541 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 542 const int len = sig->utf8_length(); 543 for (int i = 0; i < len; i++) { 544 switch (sig->char_at(i)) { 545 case JVM_SIGNATURE_CLASS: 546 // only java/lang/Object is valid here 547 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 548 return false; 549 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 550 continue; 551 case JVM_SIGNATURE_FUNC: 552 case JVM_SIGNATURE_ENDFUNC: 553 case JVM_SIGNATURE_VOID: 554 case JVM_SIGNATURE_INT: 555 case JVM_SIGNATURE_LONG: 556 case JVM_SIGNATURE_FLOAT: 557 case JVM_SIGNATURE_DOUBLE: 558 continue; 559 default: 560 // subword types (T_BYTE etc.), arrays 561 return false; 562 } 563 } 564 return true; 565 } 566 567 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 568 Symbol* bsig = NULL; 569 if (sig == NULL) { 570 return sig; 571 } else if (is_basic_type_signature(sig)) { 572 sig->increment_refcount(); 573 return sig; // that was easy 574 } else if (sig->char_at(0) != JVM_SIGNATURE_FUNC) { 575 BasicType bt = char2type(sig->char_at(0)); 576 if (is_subword_type(bt)) { 577 bsig = vmSymbols::int_signature(); 578 } else { 579 assert(is_reference_type(bt), "is_basic_type_signature was false"); 580 bsig = vmSymbols::object_signature(); 581 } 582 } else { 583 ResourceMark rm; 584 stringStream buffer(128); 585 buffer.put(JVM_SIGNATURE_FUNC); 586 int arg_pos = 0, keep_arg_pos = -1; 587 if (keep_last_arg) 588 keep_arg_pos = ArgumentCount(sig).size() - 1; 589 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 590 BasicType bt = ss.type(); 591 size_t this_arg_pos = buffer.size(); 592 if (ss.at_return_type()) { 593 buffer.put(JVM_SIGNATURE_ENDFUNC); 594 } 595 if (arg_pos == keep_arg_pos) { 596 buffer.write((char*) ss.raw_bytes(), 597 (int) ss.raw_length()); 598 } else if (is_reference_type(bt)) { 599 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 600 } else { 601 if (is_subword_type(bt)) 602 bt = T_INT; 603 buffer.put(type2char(bt)); 604 } 605 arg_pos++; 606 } 607 const char* sigstr = buffer.base(); 608 int siglen = (int) buffer.size(); 609 bsig = SymbolTable::new_symbol(sigstr, siglen); 610 } 611 assert(is_basic_type_signature(bsig) || 612 // detune assert in case the injected argument is not a basic type: 613 keep_last_arg, ""); 614 return bsig; 615 } 616 617 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 618 Symbol* sig, 619 bool keep_arrays, 620 bool keep_basic_names) { 621 st = st ? st : tty; 622 int len = sig->utf8_length(); 623 int array = 0; 624 bool prev_type = false; 625 for (int i = 0; i < len; i++) { 626 char ch = sig->char_at(i); 627 switch (ch) { 628 case JVM_SIGNATURE_FUNC: 629 case JVM_SIGNATURE_ENDFUNC: 630 prev_type = false; 631 st->put(ch); 632 continue; 633 case JVM_SIGNATURE_ARRAY: 634 if (!keep_basic_names && keep_arrays) 635 st->put(ch); 636 array++; 637 continue; 638 case JVM_SIGNATURE_CLASS: 639 { 640 if (prev_type) st->put(','); 641 int start = i+1, slash = start; 642 while (++i < len && (ch = sig->char_at(i)) != JVM_SIGNATURE_ENDCLASS) { 643 if (ch == JVM_SIGNATURE_SLASH || ch == JVM_SIGNATURE_DOT || ch == '$') slash = i+1; 644 } 645 if (slash < i) start = slash; 646 if (!keep_basic_names) { 647 st->put(JVM_SIGNATURE_CLASS); 648 } else { 649 for (int j = start; j < i; j++) 650 st->put(sig->char_at(j)); 651 prev_type = true; 652 } 653 break; 654 } 655 default: 656 { 657 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 658 ch = JVM_SIGNATURE_ARRAY; 659 array = 0; 660 } 661 if (prev_type) st->put(','); 662 const char* n = NULL; 663 if (keep_basic_names) 664 n = type2name(char2type(ch)); 665 if (n == NULL) { 666 // unknown letter, or we don't want to know its name 667 st->put(ch); 668 } else { 669 st->print("%s", n); 670 prev_type = true; 671 } 672 break; 673 } 674 } 675 // Switch break goes here to take care of array suffix: 676 if (prev_type) { 677 while (array > 0) { 678 st->print("[]"); 679 --array; 680 } 681 } 682 array = 0; 683 } 684 } 685 686 687 688 static oop object_java_mirror() { 689 return SystemDictionary::Object_klass()->java_mirror(); 690 } 691 692 oop MethodHandles::field_name_or_null(Symbol* s) { 693 if (s == NULL) return NULL; 694 return StringTable::lookup(s); 695 } 696 697 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 698 if (s == NULL) return NULL; 699 BasicType bt = FieldType::basic_type(s); 700 if (is_java_primitive(bt)) { 701 assert(s->utf8_length() == 1, ""); 702 return java_lang_Class::primitive_mirror(bt); 703 } 704 // Here are some more short cuts for common types. 705 // They are optional, since reference types can be resolved lazily. 706 if (bt == T_OBJECT) { 707 if (s == vmSymbols::object_signature()) { 708 return object_java_mirror(); 709 } else if (s == vmSymbols::class_signature()) { 710 return SystemDictionary::Class_klass()->java_mirror(); 711 } else if (s == vmSymbols::string_signature()) { 712 return SystemDictionary::String_klass()->java_mirror(); 713 } 714 } 715 return NULL; 716 } 717 718 719 // An unresolved member name is a mere symbolic reference. 720 // Resolving it plants a vmtarget/vmindex in it, 721 // which refers directly to JVM internals. 722 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, 723 bool speculative_resolve, TRAPS) { 724 Handle empty; 725 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 726 727 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 728 // Already resolved. 729 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 730 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 731 return mname; 732 } 733 734 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 735 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 736 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 737 int flags = java_lang_invoke_MemberName::flags(mname()); 738 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 739 if (!ref_kind_is_valid(ref_kind)) { 740 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 741 } 742 743 DEBUG_ONLY(int old_vmindex); 744 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 745 746 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 747 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 748 } 749 750 InstanceKlass* defc = NULL; 751 { 752 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 753 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 754 if (!defc_klass->is_instance_klass()) { 755 if (!defc_klass->is_array_klass()) return empty; 756 defc_klass = SystemDictionary::Object_klass(); 757 } 758 defc = InstanceKlass::cast(defc_klass); 759 } 760 if (defc == NULL) { 761 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 762 } 763 defc->link_class(CHECK_(empty)); // possible safepoint 764 765 // convert the external string name to an internal symbol 766 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 767 if (name == NULL) return empty; // no such name 768 if (name == vmSymbols::class_initializer_name()) 769 return empty; // illegal name 770 771 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 772 if ((flags & ALL_KINDS) == IS_METHOD && 773 (defc == SystemDictionary::MethodHandle_klass() || defc == SystemDictionary::VarHandle_klass()) && 774 (ref_kind == JVM_REF_invokeVirtual || 775 ref_kind == JVM_REF_invokeSpecial || 776 // static invocation mode is required for _linkToVirtual, etc.: 777 ref_kind == JVM_REF_invokeStatic)) { 778 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 779 if (iid != vmIntrinsics::_none && 780 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 781 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 782 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 783 mh_invoke_id = iid; 784 } 785 } 786 787 // convert the external string or reflective type to an internal signature 788 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 789 if (type == NULL) return empty; // no such signature exists in the VM 790 791 LinkInfo::AccessCheck access_check = caller != NULL ? 792 LinkInfo::needs_access_check : 793 LinkInfo::skip_access_check; 794 795 // Time to do the lookup. 796 switch (flags & ALL_KINDS) { 797 case IS_METHOD: 798 { 799 CallInfo result; 800 LinkInfo link_info(defc, name, type, caller, access_check); 801 { 802 assert(!HAS_PENDING_EXCEPTION, ""); 803 if (ref_kind == JVM_REF_invokeStatic) { 804 LinkResolver::resolve_static_call(result, 805 link_info, false, THREAD); 806 } else if (ref_kind == JVM_REF_invokeInterface) { 807 LinkResolver::resolve_interface_call(result, Handle(), defc, 808 link_info, false, THREAD); 809 } else if (mh_invoke_id != vmIntrinsics::_none) { 810 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 811 LinkResolver::resolve_handle_call(result, link_info, THREAD); 812 } else if (ref_kind == JVM_REF_invokeSpecial) { 813 LinkResolver::resolve_special_call(result, Handle(), 814 link_info, THREAD); 815 } else if (ref_kind == JVM_REF_invokeVirtual) { 816 LinkResolver::resolve_virtual_call(result, Handle(), defc, 817 link_info, false, THREAD); 818 } else { 819 assert(false, "ref_kind=%d", ref_kind); 820 } 821 if (HAS_PENDING_EXCEPTION) { 822 if (speculative_resolve) { 823 CLEAR_PENDING_EXCEPTION; 824 } 825 return empty; 826 } 827 } 828 if (result.resolved_appendix().not_null()) { 829 // The resolved MemberName must not be accompanied by an appendix argument, 830 // since there is no way to bind this value into the MemberName. 831 // Caller is responsible to prevent this from happening. 832 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 833 } 834 result.set_resolved_method_name(CHECK_(empty)); 835 oop mname2 = init_method_MemberName(mname, result); 836 return Handle(THREAD, mname2); 837 } 838 case IS_CONSTRUCTOR: 839 { 840 CallInfo result; 841 LinkInfo link_info(defc, name, type, caller, access_check); 842 { 843 assert(!HAS_PENDING_EXCEPTION, ""); 844 if (name == vmSymbols::object_initializer_name()) { 845 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD); 846 } else { 847 break; // will throw after end of switch 848 } 849 if (HAS_PENDING_EXCEPTION) { 850 if (speculative_resolve) { 851 CLEAR_PENDING_EXCEPTION; 852 } 853 return empty; 854 } 855 } 856 assert(result.is_statically_bound(), ""); 857 result.set_resolved_method_name(CHECK_(empty)); 858 oop mname2 = init_method_MemberName(mname, result); 859 return Handle(THREAD, mname2); 860 } 861 case IS_FIELD: 862 { 863 fieldDescriptor result; // find_field initializes fd if found 864 { 865 assert(!HAS_PENDING_EXCEPTION, ""); 866 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check); 867 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 868 if (HAS_PENDING_EXCEPTION) { 869 if (speculative_resolve) { 870 CLEAR_PENDING_EXCEPTION; 871 } 872 return empty; 873 } 874 } 875 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 876 return Handle(THREAD, mname2); 877 } 878 default: 879 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 880 } 881 882 return empty; 883 } 884 885 // Conversely, a member name which is only initialized from JVM internals 886 // may have null defc, name, and type fields. 887 // Resolving it plants a vmtarget/vmindex in it, 888 // which refers directly to JVM internals. 889 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 890 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 891 892 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 893 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 894 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 895 int flags = java_lang_invoke_MemberName::flags(mname()); 896 897 if (suppress != 0) { 898 if (suppress & _suppress_defc) have_defc = true; 899 if (suppress & _suppress_name) have_name = true; 900 if (suppress & _suppress_type) have_type = true; 901 } 902 903 if (have_defc && have_name && have_type) return; // nothing needed 904 905 switch (flags & ALL_KINDS) { 906 case IS_METHOD: 907 case IS_CONSTRUCTOR: 908 { 909 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 910 if (vmtarget == NULL) { 911 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 912 } 913 methodHandle m(THREAD, vmtarget); 914 DEBUG_ONLY(vmtarget = NULL); // safety 915 if (!have_defc) { 916 InstanceKlass* defc = m->method_holder(); 917 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 918 } 919 if (!have_name) { 920 //not java_lang_String::create_from_symbol; let's intern member names 921 oop name = StringTable::intern(m->name(), CHECK); 922 java_lang_invoke_MemberName::set_name(mname(), name); 923 } 924 if (!have_type) { 925 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 926 java_lang_invoke_MemberName::set_type(mname(), type()); 927 } 928 return; 929 } 930 case IS_FIELD: 931 { 932 oop clazz = java_lang_invoke_MemberName::clazz(mname()); 933 if (clazz == NULL) { 934 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)"); 935 } 936 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz)); 937 DEBUG_ONLY(clazz = NULL); // safety 938 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 939 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 940 fieldDescriptor fd; // find_field initializes fd if found 941 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 942 break; // cannot expand 943 if (!have_name) { 944 //not java_lang_String::create_from_symbol; let's intern member names 945 oop name = StringTable::intern(fd.name(), CHECK); 946 java_lang_invoke_MemberName::set_name(mname(), name); 947 } 948 if (!have_type) { 949 // If it is a primitive field type, don't mess with short strings like "I". 950 Handle type (THREAD, field_signature_type_or_null(fd.signature())); 951 if (type.is_null()) { 952 type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 953 } 954 java_lang_invoke_MemberName::set_type(mname(), type()); 955 } 956 return; 957 } 958 } 959 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 960 } 961 962 int MethodHandles::find_MemberNames(Klass* k, 963 Symbol* name, Symbol* sig, 964 int mflags, Klass* caller, 965 int skip, objArrayHandle results, TRAPS) { 966 // %%% take caller into account! 967 968 Thread* thread = Thread::current(); 969 970 if (k == NULL || !k->is_instance_klass()) return -1; 971 972 int rfill = 0, rlimit = results->length(), rskip = skip; 973 // overflow measurement: 974 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 975 976 int match_flags = mflags; 977 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 978 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 979 bool local_only = !(search_superc | search_intfc); 980 981 if (name != NULL) { 982 if (name->utf8_length() == 0) return 0; // a match is not possible 983 } 984 if (sig != NULL) { 985 if (sig->utf8_length() == 0) return 0; // a match is not possible 986 if (sig->char_at(0) == JVM_SIGNATURE_FUNC) 987 match_flags &= ~(IS_FIELD | IS_TYPE); 988 else 989 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 990 } 991 992 if ((match_flags & IS_TYPE) != 0) { 993 // NYI, and Core Reflection works quite well for this query 994 } 995 996 if ((match_flags & IS_FIELD) != 0) { 997 InstanceKlass* ik = InstanceKlass::cast(k); 998 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 999 if (name != NULL && st.name() != name) 1000 continue; 1001 if (sig != NULL && st.signature() != sig) 1002 continue; 1003 // passed the filters 1004 if (rskip > 0) { 1005 --rskip; 1006 } else if (rfill < rlimit) { 1007 Handle result(thread, results->obj_at(rfill++)); 1008 if (!java_lang_invoke_MemberName::is_instance(result())) 1009 return -99; // caller bug! 1010 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 1011 if (saved != result()) 1012 results->obj_at_put(rfill-1, saved); // show saved instance to user 1013 } else if (++overflow >= overflow_limit) { 1014 match_flags = 0; break; // got tired of looking at overflow 1015 } 1016 } 1017 } 1018 1019 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 1020 // watch out for these guys: 1021 Symbol* init_name = vmSymbols::object_initializer_name(); 1022 Symbol* clinit_name = vmSymbols::class_initializer_name(); 1023 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 1024 bool negate_name_test = false; 1025 // fix name so that it captures the intention of IS_CONSTRUCTOR 1026 if (!(match_flags & IS_METHOD)) { 1027 // constructors only 1028 if (name == NULL) { 1029 name = init_name; 1030 } else if (name != init_name) { 1031 return 0; // no constructors of this method name 1032 } 1033 } else if (!(match_flags & IS_CONSTRUCTOR)) { 1034 // methods only 1035 if (name == NULL) { 1036 name = init_name; 1037 negate_name_test = true; // if we see the name, we *omit* the entry 1038 } else if (name == init_name) { 1039 return 0; // no methods of this constructor name 1040 } 1041 } else { 1042 // caller will accept either sort; no need to adjust name 1043 } 1044 InstanceKlass* ik = InstanceKlass::cast(k); 1045 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 1046 Method* m = st.method(); 1047 Symbol* m_name = m->name(); 1048 if (m_name == clinit_name) 1049 continue; 1050 if (name != NULL && ((m_name != name) ^ negate_name_test)) 1051 continue; 1052 if (sig != NULL && m->signature() != sig) 1053 continue; 1054 // passed the filters 1055 if (rskip > 0) { 1056 --rskip; 1057 } else if (rfill < rlimit) { 1058 Handle result(thread, results->obj_at(rfill++)); 1059 if (!java_lang_invoke_MemberName::is_instance(result())) 1060 return -99; // caller bug! 1061 CallInfo info(m, NULL, CHECK_0); 1062 oop saved = MethodHandles::init_method_MemberName(result, info); 1063 if (saved != result()) 1064 results->obj_at_put(rfill-1, saved); // show saved instance to user 1065 } else if (++overflow >= overflow_limit) { 1066 match_flags = 0; break; // got tired of looking at overflow 1067 } 1068 } 1069 } 1070 1071 // return number of elements we at leasted wanted to initialize 1072 return rfill + overflow; 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); 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); 1094 } 1095 1096 void MethodHandles::clean_dependency_context(oop call_site) { 1097 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site); 1098 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1099 deps.clean_unloading_dependents(); 1100 } 1101 1102 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 1103 assert_lock_strong(Compile_lock); 1104 1105 int marked = 0; 1106 CallSiteDepChange changes(call_site, target); 1107 { 1108 NoSafepointVerifier nsv; 1109 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1110 1111 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site()); 1112 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1113 marked = deps.mark_dependent_nmethods(changes); 1114 } 1115 if (marked > 0) { 1116 // At least one nmethod has been marked for deoptimization. 1117 Deoptimization::deoptimize_all_marked(); 1118 } 1119 } 1120 1121 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) { 1122 if (TraceMethodHandles) { 1123 const char* name = vmIntrinsics::name_at(iid); 1124 if (*name == '_') name += 1; 1125 const size_t len = strlen(name) + 50; 1126 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal); 1127 const char* suffix = ""; 1128 if (is_signature_polymorphic(iid)) { 1129 if (is_signature_polymorphic_static(iid)) 1130 suffix = "/static"; 1131 else 1132 suffix = "/private"; 1133 } 1134 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix); 1135 trace_method_handle(_masm, qname); 1136 // Note: Don't free the allocated char array because it's used 1137 // during runtime. 1138 } 1139 } 1140 1141 // 1142 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1143 // They are the private interface between this JVM and the HotSpot-specific 1144 // Java code that implements JSR 292 method handles. 1145 // 1146 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1147 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1148 // 1149 1150 #ifndef PRODUCT 1151 #define EACH_NAMED_CON(template, requirement) \ 1152 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1153 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1154 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1155 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1156 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1157 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1158 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1159 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1160 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1161 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \ 1162 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \ 1163 template(java_lang_invoke_MemberName,MN_WEAK_CLASS) \ 1164 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \ 1165 /*end*/ 1166 1167 #define IGNORE_REQ(req_expr) /* req_expr */ 1168 #define ONE_PLUS(scope,value) 1+ 1169 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1170 #define VALUE_COMMA(scope,value) scope::value, 1171 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1172 #define STRING_NULL(scope,value) #value "\0" 1173 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1174 1175 static bool advertise_con_value(int which) { 1176 if (which < 0) return false; 1177 bool ok = true; 1178 int count = 0; 1179 #define INC_COUNT(scope,value) \ 1180 ++count; 1181 #define CHECK_REQ(req_expr) \ 1182 if (which < count) return ok; \ 1183 ok = (req_expr); 1184 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1185 #undef INC_COUNT 1186 #undef CHECK_REQ 1187 assert(count == con_value_count, ""); 1188 if (which < count) return ok; 1189 return false; 1190 } 1191 1192 #undef ONE_PLUS 1193 #undef VALUE_COMMA 1194 #undef STRING_NULL 1195 #undef EACH_NAMED_CON 1196 #endif // PRODUCT 1197 1198 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1199 #ifndef PRODUCT 1200 if (advertise_con_value(which)) { 1201 assert(which >= 0 && which < con_value_count, ""); 1202 int con = con_values[which]; 1203 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1204 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1205 const char* str = &con_names[0]; 1206 for (int i = 0; i < which; i++) 1207 str += strlen(str) + 1; // skip name and null 1208 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1209 box->obj_at_put(0, name); 1210 } 1211 return con; 1212 } 1213 #endif 1214 return 0; 1215 } 1216 JVM_END 1217 1218 // void init(MemberName self, AccessibleObject ref) 1219 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1220 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1221 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1222 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1223 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1224 MethodHandles::init_MemberName(mname, target, CHECK); 1225 } 1226 JVM_END 1227 1228 // void expand(MemberName self) 1229 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1230 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1231 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1232 MethodHandles::expand_MemberName(mname, 0, CHECK); 1233 } 1234 JVM_END 1235 1236 // void resolve(MemberName self, Class<?> caller) 1237 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh, 1238 jboolean speculative_resolve)) { 1239 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1240 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1241 1242 // The trusted Java code that calls this method should already have performed 1243 // access checks on behalf of the given caller. But, we can verify this. 1244 if (VerifyMethodHandles && caller_jh != NULL && 1245 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1246 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1247 if (reference_klass != NULL && reference_klass->is_objArray_klass()) { 1248 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1249 } 1250 1251 // Reflection::verify_class_access can only handle instance classes. 1252 if (reference_klass != NULL && reference_klass->is_instance_klass()) { 1253 // Emulate LinkResolver::check_klass_accessability. 1254 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1255 if (caller != SystemDictionary::Object_klass() 1256 && Reflection::verify_class_access(caller, 1257 InstanceKlass::cast(reference_klass), 1258 true) != Reflection::ACCESS_OK) { 1259 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1260 } 1261 } 1262 } 1263 1264 Klass* caller = caller_jh == NULL ? NULL : 1265 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1266 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE, 1267 CHECK_NULL); 1268 1269 if (resolved.is_null()) { 1270 int flags = java_lang_invoke_MemberName::flags(mname()); 1271 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1272 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1273 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1274 } 1275 if (speculative_resolve) { 1276 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively"); 1277 return NULL; 1278 } 1279 if ((flags & ALL_KINDS) == IS_FIELD) { 1280 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed"); 1281 } else if ((flags & ALL_KINDS) == IS_METHOD || 1282 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1283 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed"); 1284 } else { 1285 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1286 } 1287 } 1288 1289 return JNIHandles::make_local(THREAD, resolved()); 1290 } 1291 JVM_END 1292 1293 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1294 if (mname == NULL || 1295 java_lang_invoke_MemberName::clazz(mname) == NULL) { 1296 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1297 } else { 1298 int flags = java_lang_invoke_MemberName::flags(mname); 1299 if ((flags & IS_FIELD) != 0 && 1300 (must_be_static 1301 ? (flags & JVM_ACC_STATIC) != 0 1302 : (flags & JVM_ACC_STATIC) == 0)) { 1303 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1304 return (jlong) vmindex; 1305 } 1306 } 1307 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1308 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1309 return 0; 1310 } 1311 1312 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1313 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1314 } 1315 JVM_END 1316 1317 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1318 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1319 } 1320 JVM_END 1321 1322 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1323 // use the other function to perform sanity checks: 1324 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1325 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1326 return JNIHandles::make_local(THREAD, clazz); 1327 } 1328 JVM_END 1329 1330 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1331 if (mname_jh == NULL) return NULL; 1332 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1333 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1334 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1335 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1336 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1337 result->obj_at_put(0, x); 1338 1339 int flags = java_lang_invoke_MemberName::flags(mname()); 1340 if ((flags & IS_FIELD) != 0) { 1341 x = java_lang_invoke_MemberName::clazz(mname()); 1342 } else { 1343 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1344 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method"); 1345 x = mname(); 1346 } 1347 result->obj_at_put(1, x); 1348 return JNIHandles::make_local(env, result()); 1349 } 1350 JVM_END 1351 1352 1353 1354 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1355 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1356 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1357 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1358 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1359 if (clazz_jh == NULL || results_jh == NULL) return -1; 1360 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)); 1361 1362 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1363 if (results.is_null() || !results->is_objArray()) return -1; 1364 1365 TempNewSymbol name = NULL; 1366 TempNewSymbol sig = NULL; 1367 if (name_jh != NULL) { 1368 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1369 if (name == NULL) return 0; // a match is not possible 1370 } 1371 if (sig_jh != NULL) { 1372 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1373 if (sig == NULL) return 0; // a match is not possible 1374 } 1375 1376 Klass* caller = NULL; 1377 if (caller_jh != NULL) { 1378 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1379 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1380 caller = java_lang_Class::as_Klass(caller_oop); 1381 } 1382 1383 if (name != NULL && sig != NULL && results.not_null()) { 1384 // try a direct resolve 1385 // %%% TO DO 1386 } 1387 1388 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1389 caller, skip, results, CHECK_0); 1390 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1391 return res; 1392 } 1393 JVM_END 1394 1395 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1396 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1397 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1398 { 1399 // Walk all nmethods depending on this call site. 1400 MutexLocker mu(Compile_lock, thread); 1401 MethodHandles::flush_dependent_nmethods(call_site, target); 1402 java_lang_invoke_CallSite::set_target(call_site(), target()); 1403 } 1404 } 1405 JVM_END 1406 1407 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1408 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1409 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1410 { 1411 // Walk all nmethods depending on this call site. 1412 MutexLocker mu(Compile_lock, thread); 1413 MethodHandles::flush_dependent_nmethods(call_site, target); 1414 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1415 } 1416 } 1417 JVM_END 1418 1419 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls, 1420 jobject caller_jh, jintArray index_info_jh, 1421 jint start, jint end, 1422 jobjectArray buf_jh, jint pos, 1423 jboolean resolve, jobject ifna_jh)) { 1424 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh)); 1425 if (caller_k == NULL || !caller_k->is_instance_klass()) { 1426 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller"); 1427 } 1428 InstanceKlass* caller = InstanceKlass::cast(caller_k); 1429 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh); 1430 if (index_info_oop == NULL || 1431 index_info_oop->klass() != Universe::intArrayKlassObj() || 1432 typeArrayOop(index_info_oop)->length() < 2) { 1433 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)"); 1434 } 1435 typeArrayHandle index_info(THREAD, index_info_oop); 1436 int bss_index_in_pool = index_info->int_at(1); 1437 // While we are here, take a quick look at the index info: 1438 if (bss_index_in_pool <= 0 || 1439 bss_index_in_pool >= caller->constants()->length() || 1440 index_info->int_at(0) 1441 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) { 1442 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)"); 1443 } 1444 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh)); 1445 if (start < 0) { 1446 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) { 1447 if (start == pseudo_index) { 1448 if (start >= end || 0 > pos || pos >= buf->length()) break; 1449 oop pseudo_arg = NULL; 1450 switch (pseudo_index) { 1451 case -4: // bootstrap method 1452 { 1453 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool); 1454 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK); 1455 break; 1456 } 1457 case -3: // name 1458 { 1459 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool); 1460 Handle str = java_lang_String::create_from_symbol(name, CHECK); 1461 pseudo_arg = str(); 1462 break; 1463 } 1464 case -2: // type 1465 { 1466 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool); 1467 Handle th; 1468 if (type->char_at(0) == JVM_SIGNATURE_FUNC) { 1469 th = SystemDictionary::find_method_handle_type(type, caller, CHECK); 1470 } else { 1471 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK); 1472 } 1473 pseudo_arg = th(); 1474 break; 1475 } 1476 case -1: // argument count 1477 { 1478 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool); 1479 jvalue argc_value; argc_value.i = (jint)argc; 1480 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK); 1481 break; 1482 } 1483 } 1484 1485 // Store the pseudo-argument, and advance the pointers. 1486 buf->obj_at_put(pos++, pseudo_arg); 1487 ++start; 1488 } 1489 } 1490 // When we are done with this there may be regular arguments to process too. 1491 } 1492 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh)); 1493 caller->constants()-> 1494 copy_bootstrap_arguments_at(bss_index_in_pool, 1495 start, end, buf, pos, 1496 (resolve == JNI_TRUE), ifna, CHECK); 1497 } 1498 JVM_END 1499 1500 // It is called by a Cleaner object which ensures that dropped CallSites properly 1501 // deallocate their dependency information. 1502 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1503 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1504 { 1505 // Walk all nmethods depending on this call site. 1506 MutexLocker mu1(Compile_lock, thread); 1507 1508 int marked = 0; 1509 { 1510 NoSafepointVerifier nsv; 1511 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1512 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1513 marked = deps.remove_all_dependents(); 1514 } 1515 if (marked > 0) { 1516 // At least one nmethod has been marked for deoptimization 1517 Deoptimization::deoptimize_all_marked(); 1518 } 1519 } 1520 } 1521 JVM_END 1522 1523 /* 1524 * Return the class data from the injected classData field of the given lookup class 1525 */ 1526 JVM_ENTRY(jobject, MHN_classData(JNIEnv *env, jobject igcls, jclass lookup)) 1527 if (lookup == NULL) { 1528 THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Lookup class is null"); 1529 } 1530 oop mirror = JNIHandles::resolve_non_null(lookup); 1531 return (jobject) JNIHandles::make_local(env, java_lang_Class::class_data(mirror)); 1532 JVM_END 1533 1534 /** 1535 * Throws a java/lang/UnsupportedOperationException unconditionally. 1536 * This is required by the specification of MethodHandle.invoke if 1537 * invoked directly. 1538 */ 1539 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1540 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1541 return NULL; 1542 } 1543 JVM_END 1544 1545 /** 1546 * Throws a java/lang/UnsupportedOperationException unconditionally. 1547 * This is required by the specification of MethodHandle.invokeExact if 1548 * invoked directly. 1549 */ 1550 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1551 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1552 return NULL; 1553 } 1554 JVM_END 1555 1556 /// JVM_RegisterMethodHandleMethods 1557 1558 #undef CS // Solaris builds complain 1559 1560 #define LANG "Ljava/lang/" 1561 #define JLINV "Ljava/lang/invoke/" 1562 1563 #define OBJ LANG "Object;" 1564 #define CLS LANG "Class;" 1565 #define STRG LANG "String;" 1566 #define CS JLINV "CallSite;" 1567 #define MT JLINV "MethodType;" 1568 #define MH JLINV "MethodHandle;" 1569 #define MEM JLINV "MemberName;" 1570 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1571 1572 #define CC (char*) /*cast a literal from (const char*)*/ 1573 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1574 1575 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1576 static JNINativeMethod MHN_methods[] = { 1577 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1578 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1579 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)}, 1580 // static native int getNamedCon(int which, Object[] name) 1581 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1582 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1583 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1584 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1585 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1586 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1587 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1588 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)}, 1589 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1590 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1591 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1592 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)}, 1593 {CC "classData", CC "(" CLS ")" OBJ, FN_PTR(MHN_classData)} 1594 }; 1595 1596 static JNINativeMethod MH_methods[] = { 1597 // UnsupportedOperationException throwers 1598 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1599 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1600 }; 1601 1602 /** 1603 * This one function is exported, used by NativeLookup. 1604 */ 1605 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1606 assert(!MethodHandles::enabled(), "must not be enabled"); 1607 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 1608 1609 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1610 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror); 1611 1612 { 1613 ThreadToNativeFromVM ttnfv(thread); 1614 1615 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1616 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1617 "register java.lang.invoke.MethodHandleNative natives"); 1618 1619 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1620 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1621 "register java.lang.invoke.MethodHandle natives"); 1622 } 1623 1624 if (TraceInvokeDynamic) { 1625 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1626 } 1627 1628 MethodHandles::set_enabled(true); 1629 } 1630 JVM_END