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