1 /* 2 * Copyright (c) 2008, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaClasses.inline.hpp" 27 #include "classfile/stringTable.hpp" 28 #include "code/codeCache.hpp" 29 #include "code/dependencyContext.hpp" 30 #include "compiler/compileBroker.hpp" 31 #include "interpreter/interpreter.hpp" 32 #include "interpreter/oopMapCache.hpp" 33 #include "interpreter/linkResolver.hpp" 34 #include "memory/allocation.inline.hpp" 35 #include "memory/oopFactory.hpp" 36 #include "memory/resourceArea.hpp" 37 #include "oops/objArrayOop.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "oops/typeArrayOop.inline.hpp" 40 #include "prims/methodHandles.hpp" 41 #include "runtime/compilationPolicy.hpp" 42 #include "runtime/interfaceSupport.inline.hpp" 43 #include "runtime/javaCalls.hpp" 44 #include "runtime/jniHandles.inline.hpp" 45 #include "runtime/timerTrace.hpp" 46 #include "runtime/reflection.hpp" 47 #include "runtime/safepointVerifiers.hpp" 48 #include "runtime/signature.hpp" 49 #include "runtime/stubRoutines.hpp" 50 #include "utilities/exceptions.hpp" 51 52 53 /* 54 * JSR 292 reference implementation: method handles 55 * The JDK 7 reference implementation represented method handle 56 * combinations as chains. Each link in the chain had a "vmentry" 57 * field which pointed at a bit of assembly code which performed 58 * one transformation before dispatching to the next link in the chain. 59 * 60 * The current reference implementation pushes almost all code generation 61 * responsibility to (trusted) Java code. A method handle contains a 62 * pointer to its "LambdaForm", which embodies all details of the method 63 * handle's behavior. The LambdaForm is a normal Java object, managed 64 * by a runtime coded in Java. 65 */ 66 67 bool MethodHandles::_enabled = false; // set true after successful native linkage 68 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 69 70 /** 71 * Generates method handle adapters. Returns 'false' if memory allocation 72 * failed and true otherwise. 73 */ 74 void MethodHandles::generate_adapters() { 75 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 76 assert(_adapter_code == NULL, "generate only once"); 77 78 ResourceMark rm; 79 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime)); 80 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 81 CodeBuffer code(_adapter_code); 82 MethodHandlesAdapterGenerator g(&code); 83 g.generate(); 84 code.log_section_sizes("MethodHandlesAdapterBlob"); 85 } 86 87 //------------------------------------------------------------------------------ 88 // MethodHandlesAdapterGenerator::generate 89 // 90 void MethodHandlesAdapterGenerator::generate() { 91 // Generate generic method handle adapters. 92 // Generate interpreter entries 93 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 94 mk <= Interpreter::method_handle_invoke_LAST; 95 mk = Interpreter::MethodKind(1 + (int)mk)) { 96 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 97 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 98 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 99 if (entry != NULL) { 100 Interpreter::set_entry_for_kind(mk, entry); 101 } 102 // If the entry is not set, it will throw AbstractMethodError. 103 } 104 } 105 106 void MethodHandles::set_enabled(bool z) { 107 if (_enabled != z) { 108 guarantee(z, "can only enable once"); 109 _enabled = z; 110 } 111 } 112 113 // MemberName support 114 115 // import java_lang_invoke_MemberName.* 116 enum { 117 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 118 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 119 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 120 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 121 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 122 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 123 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 124 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 125 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 126 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 127 }; 128 129 int MethodHandles::ref_kind_to_flags(int ref_kind) { 130 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind); 131 int flags = (ref_kind << REFERENCE_KIND_SHIFT); 132 if (ref_kind_is_field(ref_kind)) { 133 flags |= IS_FIELD; 134 } else if (ref_kind_is_method(ref_kind)) { 135 flags |= IS_METHOD; 136 } else if (ref_kind == JVM_REF_newInvokeSpecial) { 137 flags |= IS_CONSTRUCTOR; 138 } 139 return flags; 140 } 141 142 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) { 143 Handle empty; 144 Handle type(THREAD, java_lang_invoke_MemberName::type(mname())); 145 if (!java_lang_String::is_instance_inlined(type())) { 146 return type; // already resolved 147 } 148 Symbol* signature = java_lang_String::as_symbol_or_null(type()); 149 if (signature == NULL) { 150 return empty; // no such signature exists in the VM 151 } 152 Handle resolved; 153 int flags = java_lang_invoke_MemberName::flags(mname()); 154 switch (flags & ALL_KINDS) { 155 case IS_METHOD: 156 case IS_CONSTRUCTOR: 157 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty)); 158 break; 159 case IS_FIELD: 160 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty)); 161 break; 162 default: 163 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 164 } 165 if (resolved.is_null()) { 166 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty); 167 } 168 return resolved; 169 } 170 171 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) { 172 // This method is used from java.lang.invoke.MemberName constructors. 173 // It fills in the new MemberName from a java.lang.reflect.Member. 174 Thread* thread = Thread::current(); 175 oop target_oop = target(); 176 Klass* target_klass = target_oop->klass(); 177 if (target_klass == SystemDictionary::reflect_Field_klass()) { 178 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 179 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 180 Klass* k = java_lang_Class::as_Klass(clazz); 181 if (k != NULL && k->is_instance_klass()) { 182 fieldDescriptor fd(InstanceKlass::cast(k), slot); 183 oop mname2 = init_field_MemberName(mname, fd); 184 if (mname2 != NULL) { 185 // Since we have the reified name and type handy, add them to the result. 186 if (java_lang_invoke_MemberName::name(mname2) == NULL) 187 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 188 if (java_lang_invoke_MemberName::type(mname2) == NULL) 189 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 190 } 191 return mname2; 192 } 193 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 194 oop clazz = java_lang_reflect_Method::clazz(target_oop); 195 int slot = java_lang_reflect_Method::slot(target_oop); 196 Klass* k = java_lang_Class::as_Klass(clazz); 197 if (k != NULL && k->is_instance_klass()) { 198 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 199 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 200 return NULL; // do not resolve unless there is a concrete signature 201 CallInfo info(m, k, CHECK_NULL); 202 return init_method_MemberName(mname, info); 203 } 204 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 205 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 206 int slot = java_lang_reflect_Constructor::slot(target_oop); 207 Klass* k = java_lang_Class::as_Klass(clazz); 208 if (k != NULL && k->is_instance_klass()) { 209 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 210 if (m == NULL) return NULL; 211 CallInfo info(m, k, CHECK_NULL); 212 return init_method_MemberName(mname, info); 213 } 214 } 215 return NULL; 216 } 217 218 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 219 assert(info.resolved_appendix().is_null(), "only normal methods here"); 220 methodHandle m = info.resolved_method(); 221 assert(m.not_null(), "null method handle"); 222 Klass* m_klass = m->method_holder(); 223 assert(m_klass != NULL, "null holder for method handle"); 224 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 225 int vmindex = Method::invalid_vtable_index; 226 227 switch (info.call_kind()) { 228 case CallInfo::itable_call: 229 vmindex = info.itable_index(); 230 // More importantly, the itable index only works with the method holder. 231 assert(m_klass->verify_itable_index(vmindex), ""); 232 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 233 if (TraceInvokeDynamic) { 234 ttyLocker ttyl; 235 ResourceMark rm; 236 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 237 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 238 vmindex); 239 m->access_flags().print_on(tty); 240 if (!m->is_abstract()) { 241 if (!m->is_private()) { 242 tty->print("default"); 243 } 244 else { 245 tty->print("private-intf"); 246 } 247 } 248 tty->cr(); 249 } 250 break; 251 252 case CallInfo::vtable_call: 253 vmindex = info.vtable_index(); 254 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 255 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe"); 256 if (m_klass->is_interface()) { 257 // This is a vtable call to an interface method (abstract "miranda method" or default method). 258 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 259 // (LinkResolver should help us figure this out.) 260 Klass* m_klass_non_interface = info.resolved_klass(); 261 if (m_klass_non_interface->is_interface()) { 262 m_klass_non_interface = SystemDictionary::Object_klass(); 263 #ifdef ASSERT 264 { ResourceMark rm; 265 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex); 266 assert(m->name() == m2->name() && m->signature() == m2->signature(), 267 "at %d, %s != %s", vmindex, 268 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 269 } 270 #endif //ASSERT 271 } 272 if (!m->is_public()) { 273 assert(m->is_public(), "virtual call must be to public interface method"); 274 return NULL; // elicit an error later in product build 275 } 276 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe"); 277 m_klass = m_klass_non_interface; 278 } 279 if (TraceInvokeDynamic) { 280 ttyLocker ttyl; 281 ResourceMark rm; 282 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 283 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 284 m_klass->internal_name(), vmindex); 285 m->access_flags().print_on(tty); 286 if (m->is_default_method()) { 287 tty->print("default"); 288 } 289 tty->cr(); 290 } 291 break; 292 293 case CallInfo::direct_call: 294 vmindex = Method::nonvirtual_vtable_index; 295 if (m->is_static()) { 296 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 297 } else if (m->is_initializer()) { 298 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 299 } else { 300 // "special" implies a direct call here, regardless of whether we are 301 // dealing with classes or interfaces 302 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 303 } 304 break; 305 306 default: assert(false, "bad CallInfo"); return NULL; 307 } 308 309 // @CallerSensitive annotation detected 310 if (m->caller_sensitive()) { 311 flags |= CALLER_SENSITIVE; 312 } 313 314 Handle resolved_method = info.resolved_method_name(); 315 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(), 316 "Should not change after link resolution"); 317 318 oop mname_oop = mname(); 319 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 320 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method()); 321 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index 322 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror()); 323 // Note: name and type can be lazily computed by resolve_MemberName, 324 // if Java code needs them as resolved String and MethodType objects. 325 // If relevant, the vtable or itable value is stored as vmindex. 326 // This is done eagerly, since it is readily available without 327 // constructing any new objects. 328 return mname(); 329 } 330 331 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 332 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 333 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 334 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 335 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 336 337 oop mname_oop = mname(); 338 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 339 java_lang_invoke_MemberName::set_method (mname_oop, NULL); 340 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 341 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror()); 342 343 oop type = field_signature_type_or_null(fd.signature()); 344 oop name = field_name_or_null(fd.name()); 345 if (name != NULL) 346 java_lang_invoke_MemberName::set_name(mname_oop, name); 347 if (type != NULL) 348 java_lang_invoke_MemberName::set_type(mname_oop, type); 349 // Note: name and type can be lazily computed by resolve_MemberName, 350 // if Java code needs them as resolved String and Class objects. 351 // Note that the incoming type oop might be pre-resolved (non-null). 352 // The base clazz and field offset (vmindex) must be eagerly stored, 353 // because they unambiguously identify the field. 354 // Although the fieldDescriptor::_index would also identify the field, 355 // we do not use it, because it is harder to decode. 356 // TO DO: maybe intern mname_oop 357 return mname(); 358 } 359 360 // JVM 2.9 Special Methods: 361 // A method is signature polymorphic if and only if all of the following conditions hold : 362 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes. 363 // * It has a single formal parameter of type Object[]. 364 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. 365 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 366 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 367 if (klass == NULL) 368 return false; 369 // The following test will fail spuriously during bootstrap of MethodHandle itself: 370 // if (klass != SystemDictionary::MethodHandle_klass()) 371 // Test the name instead: 372 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() && 373 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { 374 return false; 375 } 376 377 // Look up signature polymorphic method with polymorphic return type 378 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 379 InstanceKlass* iklass = InstanceKlass::cast(klass); 380 Method* m = iklass->find_method(name, poly_sig); 381 if (m != NULL) { 382 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 383 int flags = m->access_flags().as_int(); 384 if ((flags & required) == required) { 385 return true; 386 } 387 } 388 389 // Look up signature polymorphic method with non-polymorphic (non Object) return type 390 int me; 391 int ms = iklass->find_method_by_name(name, &me); 392 if (ms == -1) return false; 393 for (; ms < me; ms++) { 394 Method* m = iklass->methods()->at(ms); 395 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 396 int flags = m->access_flags().as_int(); 397 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 398 return true; 399 } 400 } 401 return false; 402 } 403 404 405 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 406 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 407 switch (iid) { 408 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 409 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 410 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 411 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 412 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 413 default: 414 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 415 return 0; 416 } 417 } 418 419 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 420 switch(id) { 421 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 422 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 423 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 424 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 425 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 426 default: 427 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 428 return Bytecodes::_illegal; 429 } 430 } 431 432 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 433 switch (iid) { 434 case vmIntrinsics::_invokeBasic: return 0; 435 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 436 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 437 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 438 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 439 default: 440 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 441 return 0; 442 } 443 } 444 445 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 446 vmSymbols::SID name_id = vmSymbols::find_sid(name); 447 switch (name_id) { 448 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 449 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 450 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 451 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 452 453 // There is one static signature-polymorphic method for each JVM invocation mode. 454 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 455 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 456 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 457 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 458 default: break; 459 } 460 461 // Cover the case of invokeExact and any future variants of invokeFoo. 462 Klass* mh_klass = SystemDictionary::well_known_klass( 463 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 464 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) { 465 return vmIntrinsics::_invokeGeneric; 466 } 467 468 // Cover the case of methods on VarHandle. 469 Klass* vh_klass = SystemDictionary::well_known_klass( 470 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) ); 471 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) { 472 return vmIntrinsics::_invokeGeneric; 473 } 474 475 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 476 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 477 return vmIntrinsics::_none; 478 } 479 480 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 481 if (klass != NULL && 482 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() || 483 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { 484 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 485 if (iid != vmIntrinsics::_none) 486 return iid; 487 if (is_method_handle_invoke_name(klass, name)) 488 return vmIntrinsics::_invokeGeneric; 489 } 490 return vmIntrinsics::_none; 491 } 492 493 494 // convert the external string or reflective type to an internal signature 495 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 496 if (java_lang_invoke_MethodType::is_instance(type_str)) { 497 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 498 } else if (java_lang_Class::is_instance(type_str)) { 499 return java_lang_Class::as_signature(type_str, false, THREAD); 500 } else if (java_lang_String::is_instance_inlined(type_str)) { 501 if (intern_if_not_found) { 502 return java_lang_String::as_symbol(type_str, THREAD); 503 } else { 504 return java_lang_String::as_symbol_or_null(type_str); 505 } 506 } else { 507 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 508 } 509 } 510 511 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 512 enum { OBJ_SIG_LEN = 18 }; 513 514 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 515 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 516 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 517 const int len = sig->utf8_length(); 518 for (int i = 0; i < len; i++) { 519 switch (sig->byte_at(i)) { 520 case 'L': 521 // only java/lang/Object is valid here 522 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 523 return false; 524 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 525 continue; 526 case '(': case ')': case 'V': 527 case 'I': case 'J': case 'F': case 'D': 528 continue; 529 //case '[': 530 //case 'Z': case 'B': case 'C': case 'S': 531 default: 532 return false; 533 } 534 } 535 return true; 536 } 537 538 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 539 Symbol* bsig = NULL; 540 if (sig == NULL) { 541 return sig; 542 } else if (is_basic_type_signature(sig)) { 543 sig->increment_refcount(); 544 return sig; // that was easy 545 } else if (sig->byte_at(0) != '(') { 546 BasicType bt = char2type(sig->byte_at(0)); 547 if (is_subword_type(bt)) { 548 bsig = vmSymbols::int_signature(); 549 } else { 550 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 551 bsig = vmSymbols::object_signature(); 552 } 553 } else { 554 ResourceMark rm; 555 stringStream buffer(128); 556 buffer.put('('); 557 int arg_pos = 0, keep_arg_pos = -1; 558 if (keep_last_arg) 559 keep_arg_pos = ArgumentCount(sig).size() - 1; 560 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 561 BasicType bt = ss.type(); 562 size_t this_arg_pos = buffer.size(); 563 if (ss.at_return_type()) { 564 buffer.put(')'); 565 } 566 if (arg_pos == keep_arg_pos) { 567 buffer.write((char*) ss.raw_bytes(), 568 (int) ss.raw_length()); 569 } else if (bt == T_OBJECT || bt == T_ARRAY) { 570 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 571 } else { 572 if (is_subword_type(bt)) 573 bt = T_INT; 574 buffer.put(type2char(bt)); 575 } 576 arg_pos++; 577 } 578 const char* sigstr = buffer.base(); 579 int siglen = (int) buffer.size(); 580 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 581 } 582 assert(is_basic_type_signature(bsig) || 583 // detune assert in case the injected argument is not a basic type: 584 keep_last_arg, ""); 585 return bsig; 586 } 587 588 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 589 Symbol* sig, 590 bool keep_arrays, 591 bool keep_basic_names) { 592 st = st ? st : tty; 593 int len = sig->utf8_length(); 594 int array = 0; 595 bool prev_type = false; 596 for (int i = 0; i < len; i++) { 597 char ch = sig->byte_at(i); 598 switch (ch) { 599 case '(': case ')': 600 prev_type = false; 601 st->put(ch); 602 continue; 603 case '[': 604 if (!keep_basic_names && keep_arrays) 605 st->put(ch); 606 array++; 607 continue; 608 case 'L': 609 { 610 if (prev_type) st->put(','); 611 int start = i+1, slash = start; 612 while (++i < len && (ch = sig->byte_at(i)) != ';') { 613 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 614 } 615 if (slash < i) start = slash; 616 if (!keep_basic_names) { 617 st->put('L'); 618 } else { 619 for (int j = start; j < i; j++) 620 st->put(sig->byte_at(j)); 621 prev_type = true; 622 } 623 break; 624 } 625 default: 626 { 627 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 628 ch = '['; 629 array = 0; 630 } 631 if (prev_type) st->put(','); 632 const char* n = NULL; 633 if (keep_basic_names) 634 n = type2name(char2type(ch)); 635 if (n == NULL) { 636 // unknown letter, or we don't want to know its name 637 st->put(ch); 638 } else { 639 st->print("%s", n); 640 prev_type = true; 641 } 642 break; 643 } 644 } 645 // Switch break goes here to take care of array suffix: 646 if (prev_type) { 647 while (array > 0) { 648 st->print("[]"); 649 --array; 650 } 651 } 652 array = 0; 653 } 654 } 655 656 657 658 static oop object_java_mirror() { 659 return SystemDictionary::Object_klass()->java_mirror(); 660 } 661 662 oop MethodHandles::field_name_or_null(Symbol* s) { 663 if (s == NULL) return NULL; 664 return StringTable::lookup(s); 665 } 666 667 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 668 if (s == NULL) return NULL; 669 BasicType bt = FieldType::basic_type(s); 670 if (is_java_primitive(bt)) { 671 assert(s->utf8_length() == 1, ""); 672 return java_lang_Class::primitive_mirror(bt); 673 } 674 // Here are some more short cuts for common types. 675 // They are optional, since reference types can be resolved lazily. 676 if (bt == T_OBJECT) { 677 if (s == vmSymbols::object_signature()) { 678 return object_java_mirror(); 679 } else if (s == vmSymbols::class_signature()) { 680 return SystemDictionary::Class_klass()->java_mirror(); 681 } else if (s == vmSymbols::string_signature()) { 682 return SystemDictionary::String_klass()->java_mirror(); 683 } 684 } 685 return NULL; 686 } 687 688 689 // An unresolved member name is a mere symbolic reference. 690 // Resolving it plants a vmtarget/vmindex in it, 691 // which refers directly to JVM internals. 692 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, 693 bool speculative_resolve, TRAPS) { 694 Handle empty; 695 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 696 697 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 698 // Already resolved. 699 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 700 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 701 return mname; 702 } 703 704 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 705 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 706 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 707 int flags = java_lang_invoke_MemberName::flags(mname()); 708 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 709 if (!ref_kind_is_valid(ref_kind)) { 710 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 711 } 712 713 DEBUG_ONLY(int old_vmindex); 714 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 715 716 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 717 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 718 } 719 720 InstanceKlass* defc = NULL; 721 { 722 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 723 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 724 if (!defc_klass->is_instance_klass()) { 725 if (!defc_klass->is_array_klass()) return empty; 726 defc_klass = SystemDictionary::Object_klass(); 727 } 728 defc = InstanceKlass::cast(defc_klass); 729 } 730 if (defc == NULL) { 731 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 732 } 733 defc->link_class(CHECK_(empty)); // possible safepoint 734 735 // convert the external string name to an internal symbol 736 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 737 if (name == NULL) return empty; // no such name 738 if (name == vmSymbols::class_initializer_name()) 739 return empty; // illegal name 740 741 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 742 if ((flags & ALL_KINDS) == IS_METHOD && 743 (defc == SystemDictionary::MethodHandle_klass()) && 744 (ref_kind == JVM_REF_invokeVirtual || 745 ref_kind == JVM_REF_invokeSpecial || 746 // static invocation mode is required for _linkToVirtual, etc.: 747 ref_kind == JVM_REF_invokeStatic)) { 748 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 749 if (iid != vmIntrinsics::_none && 750 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 751 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 752 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 753 mh_invoke_id = iid; 754 } 755 } 756 757 // convert the external string or reflective type to an internal signature 758 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 759 if (type == NULL) return empty; // no such signature exists in the VM 760 761 LinkInfo::AccessCheck access_check = caller != NULL ? 762 LinkInfo::needs_access_check : 763 LinkInfo::skip_access_check; 764 765 // Time to do the lookup. 766 switch (flags & ALL_KINDS) { 767 case IS_METHOD: 768 { 769 CallInfo result; 770 LinkInfo link_info(defc, name, type, caller, access_check); 771 { 772 assert(!HAS_PENDING_EXCEPTION, ""); 773 if (ref_kind == JVM_REF_invokeStatic) { 774 LinkResolver::resolve_static_call(result, 775 link_info, false, THREAD); 776 } else if (ref_kind == JVM_REF_invokeInterface) { 777 LinkResolver::resolve_interface_call(result, Handle(), defc, 778 link_info, false, THREAD); 779 } else if (mh_invoke_id != vmIntrinsics::_none) { 780 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 781 LinkResolver::resolve_handle_call(result, link_info, THREAD); 782 } else if (ref_kind == JVM_REF_invokeSpecial) { 783 LinkResolver::resolve_special_call(result, Handle(), 784 link_info, THREAD); 785 } else if (ref_kind == JVM_REF_invokeVirtual) { 786 LinkResolver::resolve_virtual_call(result, Handle(), defc, 787 link_info, false, THREAD); 788 } else { 789 assert(false, "ref_kind=%d", ref_kind); 790 } 791 if (HAS_PENDING_EXCEPTION) { 792 if (speculative_resolve) { 793 CLEAR_PENDING_EXCEPTION; 794 } 795 return empty; 796 } 797 } 798 if (result.resolved_appendix().not_null()) { 799 // The resolved MemberName must not be accompanied by an appendix argument, 800 // since there is no way to bind this value into the MemberName. 801 // Caller is responsible to prevent this from happening. 802 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 803 } 804 result.set_resolved_method_name(CHECK_(empty)); 805 oop mname2 = init_method_MemberName(mname, result); 806 return Handle(THREAD, mname2); 807 } 808 case IS_CONSTRUCTOR: 809 { 810 CallInfo result; 811 LinkInfo link_info(defc, name, type, caller, access_check); 812 { 813 assert(!HAS_PENDING_EXCEPTION, ""); 814 if (name == vmSymbols::object_initializer_name()) { 815 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD); 816 } else { 817 break; // will throw after end of switch 818 } 819 if (HAS_PENDING_EXCEPTION) { 820 if (speculative_resolve) { 821 CLEAR_PENDING_EXCEPTION; 822 } 823 return empty; 824 } 825 } 826 assert(result.is_statically_bound(), ""); 827 result.set_resolved_method_name(CHECK_(empty)); 828 oop mname2 = init_method_MemberName(mname, result); 829 return Handle(THREAD, mname2); 830 } 831 case IS_FIELD: 832 { 833 fieldDescriptor result; // find_field initializes fd if found 834 { 835 assert(!HAS_PENDING_EXCEPTION, ""); 836 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check); 837 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 838 if (HAS_PENDING_EXCEPTION) { 839 if (speculative_resolve) { 840 CLEAR_PENDING_EXCEPTION; 841 } 842 return empty; 843 } 844 } 845 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 846 return Handle(THREAD, mname2); 847 } 848 default: 849 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 850 } 851 852 return empty; 853 } 854 855 // Conversely, a member name which is only initialized from JVM internals 856 // may have null defc, name, and type fields. 857 // Resolving it plants a vmtarget/vmindex in it, 858 // which refers directly to JVM internals. 859 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 860 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 861 862 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 863 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 864 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 865 int flags = java_lang_invoke_MemberName::flags(mname()); 866 867 if (suppress != 0) { 868 if (suppress & _suppress_defc) have_defc = true; 869 if (suppress & _suppress_name) have_name = true; 870 if (suppress & _suppress_type) have_type = true; 871 } 872 873 if (have_defc && have_name && have_type) return; // nothing needed 874 875 switch (flags & ALL_KINDS) { 876 case IS_METHOD: 877 case IS_CONSTRUCTOR: 878 { 879 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 880 if (vmtarget == NULL) { 881 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 882 } 883 methodHandle m(THREAD, vmtarget); 884 DEBUG_ONLY(vmtarget = NULL); // safety 885 if (!have_defc) { 886 InstanceKlass* defc = m->method_holder(); 887 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 888 } 889 if (!have_name) { 890 //not java_lang_String::create_from_symbol; let's intern member names 891 oop name = StringTable::intern(m->name(), CHECK); 892 java_lang_invoke_MemberName::set_name(mname(), name); 893 } 894 if (!have_type) { 895 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 896 java_lang_invoke_MemberName::set_type(mname(), type()); 897 } 898 return; 899 } 900 case IS_FIELD: 901 { 902 oop clazz = java_lang_invoke_MemberName::clazz(mname()); 903 if (clazz == NULL) { 904 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)"); 905 } 906 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz)); 907 DEBUG_ONLY(clazz = NULL); // safety 908 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 909 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 910 fieldDescriptor fd; // find_field initializes fd if found 911 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 912 break; // cannot expand 913 if (!have_name) { 914 //not java_lang_String::create_from_symbol; let's intern member names 915 oop name = StringTable::intern(fd.name(), CHECK); 916 java_lang_invoke_MemberName::set_name(mname(), name); 917 } 918 if (!have_type) { 919 // If it is a primitive field type, don't mess with short strings like "I". 920 Handle type (THREAD, field_signature_type_or_null(fd.signature())); 921 if (type.is_null()) { 922 type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 923 } 924 java_lang_invoke_MemberName::set_type(mname(), type()); 925 } 926 return; 927 } 928 } 929 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 930 } 931 932 int MethodHandles::find_MemberNames(Klass* k, 933 Symbol* name, Symbol* sig, 934 int mflags, Klass* caller, 935 int skip, objArrayHandle results, TRAPS) { 936 // %%% take caller into account! 937 938 Thread* thread = Thread::current(); 939 940 if (k == NULL || !k->is_instance_klass()) return -1; 941 942 int rfill = 0, rlimit = results->length(), rskip = skip; 943 // overflow measurement: 944 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 945 946 int match_flags = mflags; 947 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 948 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 949 bool local_only = !(search_superc | search_intfc); 950 bool classes_only = false; 951 952 if (name != NULL) { 953 if (name->utf8_length() == 0) return 0; // a match is not possible 954 } 955 if (sig != NULL) { 956 if (sig->utf8_length() == 0) return 0; // a match is not possible 957 if (sig->byte_at(0) == '(') 958 match_flags &= ~(IS_FIELD | IS_TYPE); 959 else 960 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 961 } 962 963 if ((match_flags & IS_TYPE) != 0) { 964 // NYI, and Core Reflection works quite well for this query 965 } 966 967 if ((match_flags & IS_FIELD) != 0) { 968 InstanceKlass* ik = InstanceKlass::cast(k); 969 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 970 if (name != NULL && st.name() != name) 971 continue; 972 if (sig != NULL && st.signature() != sig) 973 continue; 974 // passed the filters 975 if (rskip > 0) { 976 --rskip; 977 } else if (rfill < rlimit) { 978 Handle result(thread, results->obj_at(rfill++)); 979 if (!java_lang_invoke_MemberName::is_instance(result())) 980 return -99; // caller bug! 981 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 982 if (!oopDesc::equals(saved, result())) 983 results->obj_at_put(rfill-1, saved); // show saved instance to user 984 } else if (++overflow >= overflow_limit) { 985 match_flags = 0; break; // got tired of looking at overflow 986 } 987 } 988 } 989 990 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 991 // watch out for these guys: 992 Symbol* init_name = vmSymbols::object_initializer_name(); 993 Symbol* clinit_name = vmSymbols::class_initializer_name(); 994 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 995 bool negate_name_test = false; 996 // fix name so that it captures the intention of IS_CONSTRUCTOR 997 if (!(match_flags & IS_METHOD)) { 998 // constructors only 999 if (name == NULL) { 1000 name = init_name; 1001 } else if (name != init_name) { 1002 return 0; // no constructors of this method name 1003 } 1004 } else if (!(match_flags & IS_CONSTRUCTOR)) { 1005 // methods only 1006 if (name == NULL) { 1007 name = init_name; 1008 negate_name_test = true; // if we see the name, we *omit* the entry 1009 } else if (name == init_name) { 1010 return 0; // no methods of this constructor name 1011 } 1012 } else { 1013 // caller will accept either sort; no need to adjust name 1014 } 1015 InstanceKlass* ik = InstanceKlass::cast(k); 1016 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 1017 Method* m = st.method(); 1018 Symbol* m_name = m->name(); 1019 if (m_name == clinit_name) 1020 continue; 1021 if (name != NULL && ((m_name != name) ^ negate_name_test)) 1022 continue; 1023 if (sig != NULL && m->signature() != sig) 1024 continue; 1025 // passed the filters 1026 if (rskip > 0) { 1027 --rskip; 1028 } else if (rfill < rlimit) { 1029 Handle result(thread, results->obj_at(rfill++)); 1030 if (!java_lang_invoke_MemberName::is_instance(result())) 1031 return -99; // caller bug! 1032 CallInfo info(m, NULL, CHECK_0); 1033 oop saved = MethodHandles::init_method_MemberName(result, info); 1034 if (!oopDesc::equals(saved, result())) 1035 results->obj_at_put(rfill-1, saved); // show saved instance to user 1036 } else if (++overflow >= overflow_limit) { 1037 match_flags = 0; break; // got tired of looking at overflow 1038 } 1039 } 1040 } 1041 1042 // return number of elements we at leasted wanted to initialize 1043 return rfill + overflow; 1044 } 1045 1046 // Is it safe to remove stale entries from a dependency list? 1047 static bool safe_to_expunge() { 1048 // Since parallel GC threads can concurrently iterate over a dependency 1049 // list during safepoint, it is safe to remove entries only when 1050 // CodeCache lock is held. 1051 return CodeCache_lock->owned_by_self(); 1052 } 1053 1054 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 1055 assert_locked_or_safepoint(CodeCache_lock); 1056 1057 oop context = java_lang_invoke_CallSite::context(call_site); 1058 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1059 // Try to purge stale entries on updates. 1060 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 1061 // in order to avoid memory leak, stale entries are purged whenever a dependency list 1062 // is changed (both on addition and removal). Though memory reclamation is delayed, 1063 // it avoids indefinite memory usage growth. 1064 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 1065 } 1066 1067 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 1068 assert_locked_or_safepoint(CodeCache_lock); 1069 1070 oop context = java_lang_invoke_CallSite::context(call_site); 1071 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1072 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 1073 } 1074 1075 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 1076 assert_lock_strong(Compile_lock); 1077 1078 int marked = 0; 1079 CallSiteDepChange changes(call_site, target); 1080 { 1081 NoSafepointVerifier nsv; 1082 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1083 1084 oop context = java_lang_invoke_CallSite::context(call_site()); 1085 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1086 marked = deps.mark_dependent_nmethods(changes); 1087 } 1088 if (marked > 0) { 1089 // At least one nmethod has been marked for deoptimization. 1090 VM_Deoptimize op; 1091 VMThread::execute(&op); 1092 } 1093 } 1094 1095 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) { 1096 if (TraceMethodHandles) { 1097 const char* name = vmIntrinsics::name_at(iid); 1098 if (*name == '_') name += 1; 1099 const size_t len = strlen(name) + 50; 1100 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal); 1101 const char* suffix = ""; 1102 if (is_signature_polymorphic(iid)) { 1103 if (is_signature_polymorphic_static(iid)) 1104 suffix = "/static"; 1105 else 1106 suffix = "/private"; 1107 } 1108 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix); 1109 trace_method_handle(_masm, qname); 1110 // Note: Don't free the allocated char array because it's used 1111 // during runtime. 1112 } 1113 } 1114 1115 // 1116 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1117 // They are the private interface between this JVM and the HotSpot-specific 1118 // Java code that implements JSR 292 method handles. 1119 // 1120 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1121 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1122 // 1123 1124 #ifndef PRODUCT 1125 #define EACH_NAMED_CON(template, requirement) \ 1126 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1127 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1128 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1129 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1130 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1131 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1132 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1133 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1134 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1135 /*end*/ 1136 1137 #define IGNORE_REQ(req_expr) /* req_expr */ 1138 #define ONE_PLUS(scope,value) 1+ 1139 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1140 #define VALUE_COMMA(scope,value) scope::value, 1141 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1142 #define STRING_NULL(scope,value) #value "\0" 1143 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1144 1145 static bool advertise_con_value(int which) { 1146 if (which < 0) return false; 1147 bool ok = true; 1148 int count = 0; 1149 #define INC_COUNT(scope,value) \ 1150 ++count; 1151 #define CHECK_REQ(req_expr) \ 1152 if (which < count) return ok; \ 1153 ok = (req_expr); 1154 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1155 #undef INC_COUNT 1156 #undef CHECK_REQ 1157 assert(count == con_value_count, ""); 1158 if (which < count) return ok; 1159 return false; 1160 } 1161 1162 #undef ONE_PLUS 1163 #undef VALUE_COMMA 1164 #undef STRING_NULL 1165 #undef EACH_NAMED_CON 1166 #endif // PRODUCT 1167 1168 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1169 #ifndef PRODUCT 1170 if (advertise_con_value(which)) { 1171 assert(which >= 0 && which < con_value_count, ""); 1172 int con = con_values[which]; 1173 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1174 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1175 const char* str = &con_names[0]; 1176 for (int i = 0; i < which; i++) 1177 str += strlen(str) + 1; // skip name and null 1178 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1179 box->obj_at_put(0, name); 1180 } 1181 return con; 1182 } 1183 #endif 1184 return 0; 1185 } 1186 JVM_END 1187 1188 // void init(MemberName self, AccessibleObject ref) 1189 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1190 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1191 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1192 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1193 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1194 MethodHandles::init_MemberName(mname, target, CHECK); 1195 } 1196 JVM_END 1197 1198 // void expand(MemberName self) 1199 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1200 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1201 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1202 MethodHandles::expand_MemberName(mname, 0, CHECK); 1203 } 1204 JVM_END 1205 1206 // void resolve(MemberName self, Class<?> caller) 1207 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh, 1208 jboolean speculative_resolve)) { 1209 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1210 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1211 1212 // The trusted Java code that calls this method should already have performed 1213 // access checks on behalf of the given caller. But, we can verify this. 1214 if (VerifyMethodHandles && caller_jh != NULL && 1215 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1216 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1217 if (reference_klass != NULL && reference_klass->is_objArray_klass()) { 1218 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1219 } 1220 1221 // Reflection::verify_class_access can only handle instance classes. 1222 if (reference_klass != NULL && reference_klass->is_instance_klass()) { 1223 // Emulate LinkResolver::check_klass_accessability. 1224 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1225 if (caller != SystemDictionary::Object_klass() 1226 && Reflection::verify_class_access(caller, 1227 InstanceKlass::cast(reference_klass), 1228 true) != Reflection::ACCESS_OK) { 1229 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1230 } 1231 } 1232 } 1233 1234 Klass* caller = caller_jh == NULL ? NULL : 1235 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1236 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, speculative_resolve == JNI_TRUE, 1237 CHECK_NULL); 1238 1239 if (resolved.is_null()) { 1240 int flags = java_lang_invoke_MemberName::flags(mname()); 1241 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1242 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1243 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1244 } 1245 if (speculative_resolve) { 1246 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively"); 1247 return NULL; 1248 } 1249 if ((flags & ALL_KINDS) == IS_FIELD) { 1250 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed"); 1251 } else if ((flags & ALL_KINDS) == IS_METHOD || 1252 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1253 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed"); 1254 } else { 1255 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1256 } 1257 } 1258 1259 return JNIHandles::make_local(THREAD, resolved()); 1260 } 1261 JVM_END 1262 1263 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1264 if (mname == NULL || 1265 java_lang_invoke_MemberName::clazz(mname) == NULL) { 1266 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1267 } else { 1268 int flags = java_lang_invoke_MemberName::flags(mname); 1269 if ((flags & IS_FIELD) != 0 && 1270 (must_be_static 1271 ? (flags & JVM_ACC_STATIC) != 0 1272 : (flags & JVM_ACC_STATIC) == 0)) { 1273 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1274 return (jlong) vmindex; 1275 } 1276 } 1277 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1278 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1279 return 0; 1280 } 1281 1282 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1283 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1284 } 1285 JVM_END 1286 1287 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1288 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1289 } 1290 JVM_END 1291 1292 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1293 // use the other function to perform sanity checks: 1294 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1295 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1296 return JNIHandles::make_local(THREAD, clazz); 1297 } 1298 JVM_END 1299 1300 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1301 if (mname_jh == NULL) return NULL; 1302 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1303 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1304 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1305 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1306 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1307 result->obj_at_put(0, x); 1308 1309 int flags = java_lang_invoke_MemberName::flags(mname()); 1310 if ((flags & IS_FIELD) != 0) { 1311 x = java_lang_invoke_MemberName::clazz(mname()); 1312 } else { 1313 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1314 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method"); 1315 x = mname(); 1316 } 1317 result->obj_at_put(1, x); 1318 return JNIHandles::make_local(env, result()); 1319 } 1320 JVM_END 1321 1322 1323 1324 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1325 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1326 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1327 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1328 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1329 if (clazz_jh == NULL || results_jh == NULL) return -1; 1330 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)); 1331 1332 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1333 if (results.is_null() || !results->is_objArray()) return -1; 1334 1335 TempNewSymbol name = NULL; 1336 TempNewSymbol sig = NULL; 1337 if (name_jh != NULL) { 1338 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1339 if (name == NULL) return 0; // a match is not possible 1340 } 1341 if (sig_jh != NULL) { 1342 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1343 if (sig == NULL) return 0; // a match is not possible 1344 } 1345 1346 Klass* caller = NULL; 1347 if (caller_jh != NULL) { 1348 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1349 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1350 caller = java_lang_Class::as_Klass(caller_oop); 1351 } 1352 1353 if (name != NULL && sig != NULL && results.not_null()) { 1354 // try a direct resolve 1355 // %%% TO DO 1356 } 1357 1358 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1359 caller, skip, results, CHECK_0); 1360 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1361 return res; 1362 } 1363 JVM_END 1364 1365 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1366 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1367 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1368 { 1369 // Walk all nmethods depending on this call site. 1370 MutexLocker mu(Compile_lock, thread); 1371 MethodHandles::flush_dependent_nmethods(call_site, target); 1372 java_lang_invoke_CallSite::set_target(call_site(), target()); 1373 } 1374 } 1375 JVM_END 1376 1377 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1378 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1379 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1380 { 1381 // Walk all nmethods depending on this call site. 1382 MutexLocker mu(Compile_lock, thread); 1383 MethodHandles::flush_dependent_nmethods(call_site, target); 1384 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1385 } 1386 } 1387 JVM_END 1388 1389 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls, 1390 jobject caller_jh, jintArray index_info_jh, 1391 jint start, jint end, 1392 jobjectArray buf_jh, jint pos, 1393 jboolean resolve, jobject ifna_jh)) { 1394 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh)); 1395 if (caller_k == NULL || !caller_k->is_instance_klass()) { 1396 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller"); 1397 } 1398 InstanceKlass* caller = InstanceKlass::cast(caller_k); 1399 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh); 1400 if (index_info_oop == NULL || 1401 index_info_oop->klass() != Universe::intArrayKlassObj() || 1402 typeArrayOop(index_info_oop)->length() < 2) { 1403 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)"); 1404 } 1405 typeArrayHandle index_info(THREAD, index_info_oop); 1406 int bss_index_in_pool = index_info->int_at(1); 1407 // While we are here, take a quick look at the index info: 1408 if (bss_index_in_pool <= 0 || 1409 bss_index_in_pool >= caller->constants()->length() || 1410 index_info->int_at(0) 1411 != caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool)) { 1412 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)"); 1413 } 1414 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh)); 1415 if (start < 0) { 1416 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) { 1417 if (start == pseudo_index) { 1418 if (start >= end || 0 > pos || pos >= buf->length()) break; 1419 oop pseudo_arg = NULL; 1420 switch (pseudo_index) { 1421 case -4: // bootstrap method 1422 { 1423 int bsm_index = caller->constants()->invoke_dynamic_bootstrap_method_ref_index_at(bss_index_in_pool); 1424 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK); 1425 break; 1426 } 1427 case -3: // name 1428 { 1429 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool); 1430 Handle str = java_lang_String::create_from_symbol(name, CHECK); 1431 pseudo_arg = str(); 1432 break; 1433 } 1434 case -2: // type 1435 { 1436 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool); 1437 Handle th; 1438 if (type->byte_at(0) == '(') { 1439 th = SystemDictionary::find_method_handle_type(type, caller, CHECK); 1440 } else { 1441 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK); 1442 } 1443 pseudo_arg = th(); 1444 break; 1445 } 1446 case -1: // argument count 1447 { 1448 int argc = caller->constants()->invoke_dynamic_argument_count_at(bss_index_in_pool); 1449 jvalue argc_value; argc_value.i = (jint)argc; 1450 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK); 1451 break; 1452 } 1453 } 1454 1455 // Store the pseudo-argument, and advance the pointers. 1456 buf->obj_at_put(pos++, pseudo_arg); 1457 ++start; 1458 } 1459 } 1460 // When we are done with this there may be regular arguments to process too. 1461 } 1462 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh)); 1463 caller->constants()-> 1464 copy_bootstrap_arguments_at(bss_index_in_pool, 1465 start, end, buf, pos, 1466 (resolve == JNI_TRUE), ifna, CHECK); 1467 } 1468 JVM_END 1469 1470 // It is called by a Cleaner object which ensures that dropped CallSites properly 1471 // deallocate their dependency information. 1472 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1473 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1474 { 1475 // Walk all nmethods depending on this call site. 1476 MutexLocker mu1(Compile_lock, thread); 1477 1478 int marked = 0; 1479 { 1480 NoSafepointVerifier nsv; 1481 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1482 assert(safe_to_expunge(), "removal is not safe"); 1483 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1484 marked = deps.remove_all_dependents(); 1485 } 1486 if (marked > 0) { 1487 // At least one nmethod has been marked for deoptimization 1488 VM_Deoptimize op; 1489 VMThread::execute(&op); 1490 } 1491 } 1492 } 1493 JVM_END 1494 1495 /** 1496 * Throws a java/lang/UnsupportedOperationException unconditionally. 1497 * This is required by the specification of MethodHandle.invoke if 1498 * invoked directly. 1499 */ 1500 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1501 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1502 return NULL; 1503 } 1504 JVM_END 1505 1506 /** 1507 * Throws a java/lang/UnsupportedOperationException unconditionally. 1508 * This is required by the specification of MethodHandle.invokeExact if 1509 * invoked directly. 1510 */ 1511 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1512 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1513 return NULL; 1514 } 1515 JVM_END 1516 1517 /// JVM_RegisterMethodHandleMethods 1518 1519 #undef CS // Solaris builds complain 1520 1521 #define LANG "Ljava/lang/" 1522 #define JLINV "Ljava/lang/invoke/" 1523 1524 #define OBJ LANG "Object;" 1525 #define CLS LANG "Class;" 1526 #define STRG LANG "String;" 1527 #define CS JLINV "CallSite;" 1528 #define MT JLINV "MethodType;" 1529 #define MH JLINV "MethodHandle;" 1530 #define MEM JLINV "MemberName;" 1531 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1532 1533 #define CC (char*) /*cast a literal from (const char*)*/ 1534 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1535 1536 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1537 static JNINativeMethod MHN_methods[] = { 1538 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1539 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1540 {CC "resolve", CC "(" MEM "" CLS "Z)" MEM, FN_PTR(MHN_resolve_Mem)}, 1541 // static native int getNamedCon(int which, Object[] name) 1542 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1543 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1544 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1545 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1546 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1547 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1548 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1549 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)}, 1550 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1551 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1552 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1553 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1554 }; 1555 1556 static JNINativeMethod MH_methods[] = { 1557 // UnsupportedOperationException throwers 1558 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1559 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1560 }; 1561 1562 /** 1563 * This one function is exported, used by NativeLookup. 1564 */ 1565 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1566 assert(!MethodHandles::enabled(), "must not be enabled"); 1567 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 1568 1569 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1570 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror); 1571 1572 { 1573 ThreadToNativeFromVM ttnfv(thread); 1574 1575 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1576 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1577 "register java.lang.invoke.MethodHandleNative natives"); 1578 1579 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1580 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1581 "register java.lang.invoke.MethodHandle natives"); 1582 } 1583 1584 if (TraceInvokeDynamic) { 1585 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1586 } 1587 1588 MethodHandles::set_enabled(true); 1589 } 1590 JVM_END