1 /* 2 * Copyright (c) 2008, 2023, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaClasses.inline.hpp" 27 #include "classfile/stringTable.hpp" 28 #include "classfile/symbolTable.hpp" 29 #include "classfile/systemDictionary.hpp" 30 #include "classfile/vmClasses.hpp" 31 #include "code/codeCache.hpp" 32 #include "code/dependencyContext.hpp" 33 #include "compiler/compileBroker.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "interpreter/oopMapCache.hpp" 36 #include "interpreter/linkResolver.hpp" 37 #include "jvm_io.h" 38 #include "logging/log.hpp" 39 #include "logging/logStream.hpp" 40 #include "memory/allocation.inline.hpp" 41 #include "memory/oopFactory.hpp" 42 #include "memory/resourceArea.hpp" 43 #include "memory/universe.hpp" 44 #include "oops/klass.inline.hpp" 45 #include "oops/objArrayKlass.hpp" 46 #include "oops/objArrayOop.inline.hpp" 47 #include "oops/oop.inline.hpp" 48 #include "oops/typeArrayOop.inline.hpp" 49 #include "prims/methodHandles.hpp" 50 #include "runtime/deoptimization.hpp" 51 #include "runtime/fieldDescriptor.inline.hpp" 52 #include "runtime/handles.inline.hpp" 53 #include "runtime/interfaceSupport.inline.hpp" 54 #include "runtime/javaCalls.hpp" 55 #include "runtime/jniHandles.inline.hpp" 56 #include "runtime/timerTrace.hpp" 57 #include "runtime/reflection.hpp" 58 #include "runtime/reflectionUtils.hpp" 59 #include "runtime/safepointVerifiers.hpp" 60 #include "runtime/signature.hpp" 61 #include "runtime/stubRoutines.hpp" 62 #include "sanitizers/leak.hpp" 63 #include "utilities/exceptions.hpp" 64 65 66 /* 67 * JSR 292 reference implementation: method handles 68 * The JDK 7 reference implementation represented method handle 69 * combinations as chains. Each link in the chain had a "vmentry" 70 * field which pointed at a bit of assembly code which performed 71 * one transformation before dispatching to the next link in the chain. 72 * 73 * The current reference implementation pushes almost all code generation 74 * responsibility to (trusted) Java code. A method handle contains a 75 * pointer to its "LambdaForm", which embodies all details of the method 76 * handle's behavior. The LambdaForm is a normal Java object, managed 77 * by a runtime coded in Java. 78 */ 79 80 bool MethodHandles::_enabled = false; // set true after successful native linkage 81 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = nullptr; 82 83 /** 84 * Generates method handle adapters. Returns 'false' if memory allocation 85 * failed and true otherwise. 86 */ 87 void MethodHandles::generate_adapters() { 88 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present"); 89 assert(_adapter_code == nullptr, "generate only once"); 90 91 ResourceMark rm; 92 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime)); 93 // The adapter entry is required to be aligned to CodeEntryAlignment. 94 // So we need additional bytes due to alignment. 95 int adapter_num = (int)Interpreter::method_handle_invoke_LAST - (int)Interpreter::method_handle_invoke_FIRST + 1; 96 int max_aligned_bytes = adapter_num * CodeEntryAlignment; 97 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size + max_aligned_bytes); 98 CodeBuffer code(_adapter_code); 99 MethodHandlesAdapterGenerator g(&code); 100 g.generate(); 101 code.log_section_sizes("MethodHandlesAdapterBlob"); 102 } 103 104 //------------------------------------------------------------------------------ 105 // MethodHandlesAdapterGenerator::generate 106 // 107 void MethodHandlesAdapterGenerator::generate() { 108 // Generate generic method handle adapters. 109 // Generate interpreter entries 110 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 111 mk <= Interpreter::method_handle_invoke_LAST; 112 mk = Interpreter::MethodKind(1 + (int)mk)) { 113 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 114 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 115 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 116 if (entry != nullptr) { 117 Interpreter::set_entry_for_kind(mk, entry); 118 } 119 // If the entry is not set, it will throw AbstractMethodError. 120 } 121 } 122 123 void MethodHandles::set_enabled(bool z) { 124 if (_enabled != z) { 125 guarantee(z, "can only enable once"); 126 _enabled = z; 127 } 128 } 129 130 // MemberName support 131 132 // import java_lang_invoke_MemberName.* 133 enum { 134 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 135 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 136 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 137 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 138 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 139 TRUSTED_FINAL = java_lang_invoke_MemberName::MN_TRUSTED_FINAL, 140 HIDDEN_MEMBER = java_lang_invoke_MemberName::MN_HIDDEN_MEMBER, 141 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 142 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 143 LM_UNCONDITIONAL = java_lang_invoke_MemberName::MN_UNCONDITIONAL_MODE, 144 LM_MODULE = java_lang_invoke_MemberName::MN_MODULE_MODE, 145 LM_TRUSTED = java_lang_invoke_MemberName::MN_TRUSTED_MODE, 146 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 147 }; 148 149 int MethodHandles::ref_kind_to_flags(int ref_kind) { 150 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind); 151 int flags = (ref_kind << REFERENCE_KIND_SHIFT); 152 if (ref_kind_is_field(ref_kind)) { 153 flags |= IS_FIELD; 154 } else if (ref_kind_is_method(ref_kind)) { 155 flags |= IS_METHOD; 156 } else if (ref_kind == JVM_REF_newInvokeSpecial) { 157 flags |= IS_CONSTRUCTOR; 158 } 159 return flags; 160 } 161 162 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) { 163 Handle empty; 164 Handle type(THREAD, java_lang_invoke_MemberName::type(mname())); 165 if (!java_lang_String::is_instance(type())) { 166 return type; // already resolved 167 } 168 Symbol* signature = java_lang_String::as_symbol_or_null(type()); 169 if (signature == nullptr) { 170 return empty; // no such signature exists in the VM 171 } 172 Handle resolved; 173 int flags = java_lang_invoke_MemberName::flags(mname()); 174 switch (flags & ALL_KINDS) { 175 case IS_METHOD: 176 case IS_CONSTRUCTOR: 177 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty)); 178 break; 179 case IS_FIELD: 180 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty)); 181 break; 182 default: 183 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 184 } 185 if (resolved.is_null()) { 186 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty); 187 } 188 return resolved; 189 } 190 191 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) { 192 // This method is used from java.lang.invoke.MemberName constructors. 193 // It fills in the new MemberName from a java.lang.reflect.Member. 194 oop target_oop = target(); 195 Klass* target_klass = target_oop->klass(); 196 if (target_klass == vmClasses::reflect_Field_klass()) { 197 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 198 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 199 Klass* k = java_lang_Class::as_Klass(clazz); 200 if (k != nullptr && k->is_instance_klass()) { 201 fieldDescriptor fd(InstanceKlass::cast(k), slot); 202 oop mname2 = init_field_MemberName(mname, fd); 203 if (mname2 != nullptr) { 204 // Since we have the reified name and type handy, add them to the result. 205 if (java_lang_invoke_MemberName::name(mname2) == nullptr) 206 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 207 if (java_lang_invoke_MemberName::type(mname2) == nullptr) 208 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 209 } 210 return mname2; 211 } 212 } else if (target_klass == vmClasses::reflect_Method_klass()) { 213 oop clazz = java_lang_reflect_Method::clazz(target_oop); 214 int slot = java_lang_reflect_Method::slot(target_oop); 215 Klass* k = java_lang_Class::as_Klass(clazz); 216 if (k != nullptr && k->is_instance_klass()) { 217 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 218 if (m == nullptr || is_signature_polymorphic(m->intrinsic_id())) 219 return nullptr; // do not resolve unless there is a concrete signature 220 CallInfo info(m, k, CHECK_NULL); 221 return init_method_MemberName(mname, info); 222 } 223 } else if (target_klass == vmClasses::reflect_Constructor_klass()) { 224 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 225 int slot = java_lang_reflect_Constructor::slot(target_oop); 226 Klass* k = java_lang_Class::as_Klass(clazz); 227 if (k != nullptr && k->is_instance_klass()) { 228 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 229 if (m == nullptr) return nullptr; 230 CallInfo info(m, k, CHECK_NULL); 231 return init_method_MemberName(mname, info); 232 } 233 } 234 return nullptr; 235 } 236 237 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 238 assert(info.resolved_appendix().is_null(), "only normal methods here"); 239 methodHandle m(Thread::current(), info.resolved_method()); 240 assert(m.not_null(), "null method handle"); 241 InstanceKlass* m_klass = m->method_holder(); 242 assert(m_klass != nullptr, "null holder for method handle"); 243 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 244 int vmindex = Method::invalid_vtable_index; 245 LogTarget(Debug, methodhandles, indy) lt_indy; 246 247 switch (info.call_kind()) { 248 case CallInfo::itable_call: 249 vmindex = info.itable_index(); 250 // More importantly, the itable index only works with the method holder. 251 assert(m_klass->verify_itable_index(vmindex), ""); 252 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 253 if (lt_indy.is_enabled()) { 254 ResourceMark rm; 255 LogStream ls(lt_indy); 256 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 257 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 258 vmindex); 259 m->access_flags().print_on(&ls); 260 if (!m->is_abstract()) { 261 if (!m->is_private()) { 262 ls.print("default"); 263 } 264 else { 265 ls.print("private-intf"); 266 } 267 } 268 ls.cr(); 269 } 270 break; 271 272 case CallInfo::vtable_call: 273 vmindex = info.vtable_index(); 274 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 275 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe"); 276 if (m_klass->is_interface()) { 277 // This is a vtable call to an interface method (abstract "miranda method" or default method). 278 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 279 // (LinkResolver should help us figure this out.) 280 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass"); 281 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass()); 282 if (m_klass_non_interface->is_interface()) { 283 m_klass_non_interface = vmClasses::Object_klass(); 284 #ifdef ASSERT 285 { ResourceMark rm; 286 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex); 287 assert(m->name() == m2->name() && m->signature() == m2->signature(), 288 "at %d, %s != %s", vmindex, 289 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 290 } 291 #endif //ASSERT 292 } 293 if (!m->is_public()) { 294 assert(m->is_public(), "virtual call must be to public interface method"); 295 return nullptr; // elicit an error later in product build 296 } 297 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe"); 298 m_klass = m_klass_non_interface; 299 } 300 if (lt_indy.is_enabled()) { 301 ResourceMark rm; 302 LogStream ls(lt_indy); 303 ls.print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 304 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 305 m_klass->internal_name(), vmindex); 306 m->access_flags().print_on(&ls); 307 if (m->is_default_method()) { 308 ls.print("default"); 309 } 310 ls.cr(); 311 } 312 break; 313 314 case CallInfo::direct_call: 315 vmindex = Method::nonvirtual_vtable_index; 316 if (m->is_static()) { 317 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 318 } else if (m->is_initializer()) { 319 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 320 } else { 321 // "special" reflects that this is a direct call, not that it 322 // necessarily originates from an invokespecial. We can also do 323 // direct calls for private and/or final non-static methods. 324 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 325 } 326 break; 327 328 default: assert(false, "bad CallInfo"); return nullptr; 329 } 330 331 // @CallerSensitive annotation detected 332 if (m->caller_sensitive()) { 333 flags |= CALLER_SENSITIVE; 334 } 335 336 Handle resolved_method = info.resolved_method_name(); 337 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(), 338 "Should not change after link resolution"); 339 340 oop mname_oop = mname(); 341 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 342 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method()); 343 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index 344 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror()); 345 // Note: name and type can be lazily computed by resolve_MemberName, 346 // if Java code needs them as resolved String and MethodType objects. 347 // If relevant, the vtable or itable value is stored as vmindex. 348 // This is done eagerly, since it is readily available without 349 // constructing any new objects. 350 return mname(); 351 } 352 353 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 354 InstanceKlass* ik = fd.field_holder(); 355 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 356 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 357 if (fd.is_trusted_final()) flags |= TRUSTED_FINAL; 358 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 359 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 360 361 oop mname_oop = mname(); 362 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 363 java_lang_invoke_MemberName::set_method (mname_oop, nullptr); 364 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 365 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror()); 366 367 oop type = field_signature_type_or_null(fd.signature()); 368 oop name = field_name_or_null(fd.name()); 369 if (name != nullptr) 370 java_lang_invoke_MemberName::set_name(mname_oop, name); 371 if (type != nullptr) 372 java_lang_invoke_MemberName::set_type(mname_oop, type); 373 // Note: name and type can be lazily computed by resolve_MemberName, 374 // if Java code needs them as resolved String and Class objects. 375 // Note that the incoming type oop might be pre-resolved (non-null). 376 // The base clazz and field offset (vmindex) must be eagerly stored, 377 // because they unambiguously identify the field. 378 // Although the fieldDescriptor::_index would also identify the field, 379 // we do not use it, because it is harder to decode. 380 // TO DO: maybe intern mname_oop 381 return mname(); 382 } 383 384 // JVM 2.9 Special Methods: 385 // A method is signature polymorphic if and only if all of the following conditions hold : 386 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes. 387 // * It has a single formal parameter of type Object[]. 388 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. 389 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 390 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 391 if (klass == nullptr) 392 return false; 393 // The following test will fail spuriously during bootstrap of MethodHandle itself: 394 // if (klass != vmClasses::MethodHandle_klass()) 395 // Test the name instead: 396 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() && 397 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { 398 return false; 399 } 400 401 // Look up signature polymorphic method with polymorphic return type 402 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 403 InstanceKlass* iklass = InstanceKlass::cast(klass); 404 Method* m = iklass->find_method(name, poly_sig); 405 if (m != nullptr) { 406 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 407 int flags = m->access_flags().as_int(); 408 if ((flags & required) == required) { 409 return true; 410 } 411 } 412 413 // Look up signature polymorphic method with non-polymorphic (non Object) return type 414 int me; 415 int ms = iklass->find_method_by_name(name, &me); 416 if (ms == -1) return false; 417 for (; ms < me; ms++) { 418 Method* m = iklass->methods()->at(ms); 419 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 420 int flags = m->access_flags().as_int(); 421 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 422 return true; 423 } 424 } 425 return false; 426 } 427 428 429 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 430 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid)); 431 switch (iid) { 432 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 433 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 434 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 435 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 436 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 437 case vmIntrinsics::_linkToNative: return vmSymbols::linkToNative_name(); 438 default: 439 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid)); 440 return 0; 441 } 442 } 443 444 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 445 switch(id) { 446 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 447 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 448 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 449 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 450 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 451 default: 452 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 453 return Bytecodes::_illegal; 454 } 455 } 456 457 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 458 switch (iid) { 459 case vmIntrinsics::_invokeBasic: return 0; 460 case vmIntrinsics::_linkToNative: return 0; 461 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 462 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 463 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 464 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 465 default: 466 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid)); 467 return 0; 468 } 469 } 470 471 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 472 vmSymbolID name_id = vmSymbols::find_sid(name); 473 switch (name_id) { 474 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 475 case VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 476 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 477 case VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 478 479 // There is one static signature-polymorphic method for each JVM invocation mode. 480 case VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 481 case VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 482 case VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 483 case VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 484 case VM_SYMBOL_ENUM_NAME(linkToNative_name): return vmIntrinsics::_linkToNative; 485 default: break; 486 } 487 488 // Cover the case of invokeExact and any future variants of invokeFoo. 489 Klass* mh_klass = vmClasses::klass_at(VM_CLASS_ID(MethodHandle_klass)); 490 if (mh_klass != nullptr && is_method_handle_invoke_name(mh_klass, name)) { 491 return vmIntrinsics::_invokeGeneric; 492 } 493 494 // Cover the case of methods on VarHandle. 495 Klass* vh_klass = vmClasses::klass_at(VM_CLASS_ID(VarHandle_klass)); 496 if (vh_klass != nullptr && is_method_handle_invoke_name(vh_klass, name)) { 497 return vmIntrinsics::_invokeGeneric; 498 } 499 500 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 501 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 502 return vmIntrinsics::_none; 503 } 504 505 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 506 if (klass != nullptr && 507 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() || 508 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { 509 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 510 if (iid != vmIntrinsics::_none) 511 return iid; 512 if (is_method_handle_invoke_name(klass, name)) 513 return vmIntrinsics::_invokeGeneric; 514 } 515 return vmIntrinsics::_none; 516 } 517 518 // Returns true if method is signature polymorphic and public 519 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) { 520 if (is_signature_polymorphic_name(klass, name)) { 521 InstanceKlass* iklass = InstanceKlass::cast(klass); 522 int me; 523 int ms = iklass->find_method_by_name(name, &me); 524 assert(ms != -1, ""); 525 for (; ms < me; ms++) { 526 Method* m = iklass->methods()->at(ms); 527 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC; 528 int flags = m->access_flags().as_int(); 529 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 530 return true; 531 } 532 } 533 } 534 return false; 535 } 536 537 // convert the external string or reflective type to an internal signature 538 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 539 if (java_lang_invoke_MethodType::is_instance(type_str)) { 540 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found); 541 } else if (java_lang_Class::is_instance(type_str)) { 542 return java_lang_Class::as_signature(type_str, false); 543 } else if (java_lang_String::is_instance(type_str)) { 544 if (intern_if_not_found) { 545 return java_lang_String::as_symbol(type_str); 546 } else { 547 return java_lang_String::as_symbol_or_null(type_str); 548 } 549 } else { 550 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", nullptr); 551 } 552 } 553 554 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 555 enum { OBJ_SIG_LEN = 18 }; 556 557 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 558 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 559 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 560 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) { 561 switch (ss.type()) { 562 case T_OBJECT: 563 // only java/lang/Object is valid here 564 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0) 565 return false; 566 break; 567 case T_VOID: 568 case T_INT: 569 case T_LONG: 570 case T_FLOAT: 571 case T_DOUBLE: 572 break; 573 default: 574 // subword types (T_BYTE etc.), Q-descriptors, arrays 575 return false; 576 } 577 } 578 return true; 579 } 580 581 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg) { 582 Symbol* bsig = nullptr; 583 if (sig == nullptr) { 584 return sig; 585 } else if (is_basic_type_signature(sig)) { 586 sig->increment_refcount(); 587 return sig; // that was easy 588 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) { 589 BasicType bt = Signature::basic_type(sig); 590 if (is_subword_type(bt)) { 591 bsig = vmSymbols::int_signature(); 592 } else { 593 assert(is_reference_type(bt), "is_basic_type_signature was false"); 594 bsig = vmSymbols::object_signature(); 595 } 596 } else { 597 ResourceMark rm; 598 stringStream buffer(128); 599 buffer.put(JVM_SIGNATURE_FUNC); 600 int arg_pos = 0, keep_arg_pos = -1; 601 if (keep_last_arg) 602 keep_arg_pos = ArgumentCount(sig).size() - 1; 603 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 604 BasicType bt = ss.type(); 605 size_t this_arg_pos = buffer.size(); 606 if (ss.at_return_type()) { 607 buffer.put(JVM_SIGNATURE_ENDFUNC); 608 } 609 if (arg_pos == keep_arg_pos) { 610 buffer.write((char*) ss.raw_bytes(), 611 (int) ss.raw_length()); 612 } else if (is_reference_type(bt)) { 613 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 614 } else { 615 if (is_subword_type(bt)) 616 bt = T_INT; 617 buffer.put(type2char(bt)); 618 } 619 arg_pos++; 620 } 621 const char* sigstr = buffer.base(); 622 int siglen = (int) buffer.size(); 623 bsig = SymbolTable::new_symbol(sigstr, siglen); 624 } 625 assert(is_basic_type_signature(bsig) || 626 // detune assert in case the injected argument is not a basic type: 627 keep_last_arg, ""); 628 return bsig; 629 } 630 631 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 632 Symbol* sig) { 633 st = st ? st : tty; 634 bool prev_type = false; 635 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC); 636 if (is_method) st->put(JVM_SIGNATURE_FUNC); 637 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) { 638 if (ss.at_return_type()) 639 st->put(JVM_SIGNATURE_ENDFUNC); 640 else if (prev_type) 641 st->put(','); 642 const char* cp = (const char*) ss.raw_bytes(); 643 if (ss.is_array()) { 644 st->put(JVM_SIGNATURE_ARRAY); 645 if (ss.array_prefix_length() == 1) 646 st->put(cp[1]); 647 else 648 st->put(JVM_SIGNATURE_CLASS); 649 } else { 650 st->put(cp[0]); 651 } 652 } 653 } 654 655 656 657 static oop object_java_mirror() { 658 return vmClasses::Object_klass()->java_mirror(); 659 } 660 661 oop MethodHandles::field_name_or_null(Symbol* s) { 662 if (s == nullptr) return nullptr; 663 return StringTable::lookup(s); 664 } 665 666 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 667 if (s == nullptr) return nullptr; 668 BasicType bt = Signature::basic_type(s); 669 if (is_java_primitive(bt)) { 670 assert(s->utf8_length() == 1, ""); 671 return java_lang_Class::primitive_mirror(bt); 672 } 673 // Here are some more short cuts for common types. 674 // They are optional, since reference types can be resolved lazily. 675 if (bt == T_OBJECT) { 676 if (s == vmSymbols::object_signature()) { 677 return object_java_mirror(); 678 } else if (s == vmSymbols::class_signature()) { 679 return vmClasses::Class_klass()->java_mirror(); 680 } else if (s == vmSymbols::string_signature()) { 681 return vmClasses::String_klass()->java_mirror(); 682 } 683 } 684 return nullptr; 685 } 686 687 // An unresolved member name is a mere symbolic reference. 688 // Resolving it plants a vmtarget/vmindex in it, 689 // which refers directly to JVM internals. 690 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, int lookup_mode, 691 bool speculative_resolve, TRAPS) { 692 Handle empty; 693 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 694 695 if (java_lang_invoke_MemberName::vmtarget(mname()) != nullptr) { 696 // Already resolved. 697 DEBUG_ONLY(intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname())); 698 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 699 return mname; 700 } 701 702 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 703 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 704 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 705 int flags = java_lang_invoke_MemberName::flags(mname()); 706 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 707 if (!ref_kind_is_valid(ref_kind)) { 708 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 709 } 710 711 DEBUG_ONLY(intptr_t old_vmindex); 712 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 713 714 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 715 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 716 } 717 718 InstanceKlass* defc = nullptr; 719 { 720 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 721 if (defc_klass == nullptr) return empty; // a primitive; no resolution possible 722 if (!defc_klass->is_instance_klass()) { 723 if (!defc_klass->is_array_klass()) return empty; 724 defc_klass = vmClasses::Object_klass(); 725 } 726 defc = InstanceKlass::cast(defc_klass); 727 } 728 if (defc == nullptr) { 729 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 730 } 731 defc->link_class(CHECK_(empty)); // possible safepoint 732 733 // convert the external string name to an internal symbol 734 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 735 if (name == nullptr) return empty; // no such name 736 if (name == vmSymbols::class_initializer_name()) 737 return empty; // illegal name 738 739 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 740 if ((flags & ALL_KINDS) == IS_METHOD && 741 (defc == vmClasses::MethodHandle_klass() || defc == vmClasses::VarHandle_klass()) && 742 (ref_kind == JVM_REF_invokeVirtual || 743 ref_kind == JVM_REF_invokeSpecial || 744 // static invocation mode is required for _linkToVirtual, etc.: 745 ref_kind == JVM_REF_invokeStatic)) { 746 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 747 if (iid != vmIntrinsics::_none && 748 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 749 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 750 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 751 mh_invoke_id = iid; 752 } 753 } 754 755 // convert the external string or reflective type to an internal signature 756 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 757 if (type == nullptr) return empty; // no such signature exists in the VM 758 759 // skip access check if it's trusted lookup 760 LinkInfo::AccessCheck access_check = caller != nullptr ? 761 LinkInfo::AccessCheck::required : 762 LinkInfo::AccessCheck::skip; 763 // skip loader constraints if it's trusted lookup or a public lookup 764 LinkInfo::LoaderConstraintCheck loader_constraint_check = (caller != nullptr && (lookup_mode & LM_UNCONDITIONAL) == 0) ? 765 LinkInfo::LoaderConstraintCheck::required : 766 LinkInfo::LoaderConstraintCheck::skip; 767 768 // Time to do the lookup. 769 switch (flags & ALL_KINDS) { 770 case IS_METHOD: 771 { 772 CallInfo result; 773 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check); 774 { 775 assert(!HAS_PENDING_EXCEPTION, ""); 776 if (ref_kind == JVM_REF_invokeStatic) { 777 LinkResolver::resolve_static_call(result, 778 link_info, false, THREAD); 779 } else if (ref_kind == JVM_REF_invokeInterface) { 780 LinkResolver::resolve_interface_call(result, Handle(), defc, 781 link_info, false, THREAD); 782 } else if (mh_invoke_id != vmIntrinsics::_none) { 783 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 784 LinkResolver::resolve_handle_call(result, link_info, THREAD); 785 } else if (ref_kind == JVM_REF_invokeSpecial) { 786 LinkResolver::resolve_special_call(result, Handle(), 787 link_info, THREAD); 788 } else if (ref_kind == JVM_REF_invokeVirtual) { 789 LinkResolver::resolve_virtual_call(result, Handle(), defc, 790 link_info, false, THREAD); 791 } else { 792 assert(false, "ref_kind=%d", ref_kind); 793 } 794 if (HAS_PENDING_EXCEPTION) { 795 if (speculative_resolve) { 796 CLEAR_PENDING_EXCEPTION; 797 } 798 return empty; 799 } 800 } 801 if (result.resolved_appendix().not_null()) { 802 // The resolved MemberName must not be accompanied by an appendix argument, 803 // since there is no way to bind this value into the MemberName. 804 // Caller is responsible to prevent this from happening. 805 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 806 } 807 result.set_resolved_method_name(CHECK_(empty)); 808 oop mname2 = init_method_MemberName(mname, result); 809 return Handle(THREAD, mname2); 810 } 811 case IS_CONSTRUCTOR: 812 { 813 CallInfo result; 814 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check); 815 { 816 assert(!HAS_PENDING_EXCEPTION, ""); 817 if (name == vmSymbols::object_initializer_name()) { 818 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD); 819 } else { 820 break; // will throw after end of switch 821 } 822 if (HAS_PENDING_EXCEPTION) { 823 if (speculative_resolve) { 824 CLEAR_PENDING_EXCEPTION; 825 } 826 return empty; 827 } 828 } 829 assert(result.is_statically_bound(), ""); 830 result.set_resolved_method_name(CHECK_(empty)); 831 oop mname2 = init_method_MemberName(mname, result); 832 return Handle(THREAD, mname2); 833 } 834 case IS_FIELD: 835 { 836 fieldDescriptor result; // find_field initializes fd if found 837 { 838 assert(!HAS_PENDING_EXCEPTION, ""); 839 LinkInfo link_info(defc, name, type, caller, LinkInfo::AccessCheck::skip, loader_constraint_check); 840 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 841 if (HAS_PENDING_EXCEPTION) { 842 if (speculative_resolve) { 843 CLEAR_PENDING_EXCEPTION; 844 } 845 return empty; 846 } 847 } 848 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 849 return Handle(THREAD, mname2); 850 } 851 default: 852 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 853 } 854 855 return empty; 856 } 857 858 // Conversely, a member name which is only initialized from JVM internals 859 // may have null defc, name, and type fields. 860 // Resolving it plants a vmtarget/vmindex in it, 861 // which refers directly to JVM internals. 862 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 863 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 864 865 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != nullptr); 866 bool have_name = (java_lang_invoke_MemberName::name(mname()) != nullptr); 867 bool have_type = (java_lang_invoke_MemberName::type(mname()) != nullptr); 868 int flags = java_lang_invoke_MemberName::flags(mname()); 869 870 if (suppress != 0) { 871 if (suppress & _suppress_defc) have_defc = true; 872 if (suppress & _suppress_name) have_name = true; 873 if (suppress & _suppress_type) have_type = true; 874 } 875 876 if (have_defc && have_name && have_type) return; // nothing needed 877 878 switch (flags & ALL_KINDS) { 879 case IS_METHOD: 880 case IS_CONSTRUCTOR: 881 { 882 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 883 if (vmtarget == nullptr) { 884 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 885 } 886 methodHandle m(THREAD, vmtarget); 887 DEBUG_ONLY(vmtarget = nullptr); // safety 888 if (!have_defc) { 889 InstanceKlass* defc = m->method_holder(); 890 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 891 } 892 if (!have_name) { 893 //not java_lang_String::create_from_symbol; let's intern member names 894 oop name = StringTable::intern(m->name(), CHECK); 895 java_lang_invoke_MemberName::set_name(mname(), name); 896 } 897 if (!have_type) { 898 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 899 java_lang_invoke_MemberName::set_type(mname(), type()); 900 } 901 return; 902 } 903 case IS_FIELD: 904 { 905 oop clazz = java_lang_invoke_MemberName::clazz(mname()); 906 if (clazz == nullptr) { 907 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)"); 908 } 909 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz)); 910 DEBUG_ONLY(clazz = nullptr); // safety 911 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 912 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 913 fieldDescriptor fd; // find_field initializes fd if found 914 if (!defc->find_field_from_offset(checked_cast<int>(vmindex), is_static, &fd)) 915 break; // cannot expand 916 if (!have_name) { 917 //not java_lang_String::create_from_symbol; let's intern member names 918 oop name = StringTable::intern(fd.name(), CHECK); 919 java_lang_invoke_MemberName::set_name(mname(), name); 920 } 921 if (!have_type) { 922 // If it is a primitive field type, don't mess with short strings like "I". 923 Handle type (THREAD, field_signature_type_or_null(fd.signature())); 924 if (type.is_null()) { 925 type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 926 } 927 java_lang_invoke_MemberName::set_type(mname(), type()); 928 } 929 return; 930 } 931 } 932 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 933 } 934 935 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 936 assert_locked_or_safepoint(CodeCache_lock); 937 938 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site); 939 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 940 // Try to purge stale entries on updates. 941 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 942 // in order to avoid memory leak, stale entries are purged whenever a dependency list 943 // is changed (both on addition and removal). Though memory reclamation is delayed, 944 // it avoids indefinite memory usage growth. 945 deps.add_dependent_nmethod(nm); 946 } 947 948 void MethodHandles::clean_dependency_context(oop call_site) { 949 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site); 950 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 951 deps.clean_unloading_dependents(); 952 } 953 954 void MethodHandles::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, Handle call_site, Handle target) { 955 assert_lock_strong(Compile_lock); 956 957 CallSiteDepChange changes(call_site, target); 958 { 959 NoSafepointVerifier nsv; 960 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag); 961 962 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site()); 963 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 964 deps.mark_dependent_nmethods(deopt_scope, changes); 965 } 966 } 967 968 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) { 969 if (log_is_enabled(Info, methodhandles)) { 970 const char* name = vmIntrinsics::name_at(iid); 971 if (*name == '_') name += 1; 972 const size_t len = strlen(name) + 50; 973 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal); 974 const char* suffix = ""; 975 if (is_signature_polymorphic(iid)) { 976 if (is_signature_polymorphic_static(iid)) 977 suffix = "/static"; 978 else 979 suffix = "/private"; 980 } 981 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix); 982 trace_method_handle(_masm, qname); 983 // LSan appears unable to keep track of qname, ignore it. 984 LSAN_IGNORE_OBJECT(qname); 985 // Note: Don't free the allocated char array because it's used 986 // during runtime. 987 } 988 } 989 990 // 991 // Here are the native methods in java.lang.invoke.MethodHandleNatives 992 // They are the private interface between this JVM and the HotSpot-specific 993 // Java code that implements JSR 292 method handles. 994 // 995 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 996 // that intrinsic (non-JNI) native methods are defined in HotSpot. 997 // 998 999 #ifndef PRODUCT 1000 #define EACH_NAMED_CON(template, requirement) \ 1001 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1002 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1003 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1004 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1005 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1006 template(java_lang_invoke_MemberName,MN_TRUSTED_FINAL) \ 1007 template(java_lang_invoke_MemberName,MN_HIDDEN_MEMBER) \ 1008 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1009 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1010 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \ 1011 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \ 1012 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \ 1013 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \ 1014 template(java_lang_invoke_MemberName,MN_MODULE_MODE) \ 1015 template(java_lang_invoke_MemberName,MN_UNCONDITIONAL_MODE) \ 1016 template(java_lang_invoke_MemberName,MN_TRUSTED_MODE) \ 1017 /*end*/ 1018 1019 #define IGNORE_REQ(req_expr) /* req_expr */ 1020 #define ONE_PLUS(scope,value) 1+ 1021 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1022 #define VALUE_COMMA(scope,value) scope::value, 1023 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1024 #define STRING_NULL(scope,value) #value "\0" 1025 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1026 1027 static bool advertise_con_value(int which) { 1028 if (which < 0) return false; 1029 bool ok = true; 1030 int count = 0; 1031 #define INC_COUNT(scope,value) \ 1032 ++count; 1033 #define CHECK_REQ(req_expr) \ 1034 if (which < count) return ok; \ 1035 ok = (req_expr); 1036 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1037 #undef INC_COUNT 1038 #undef CHECK_REQ 1039 assert(count == con_value_count, ""); 1040 if (which < count) return ok; 1041 return false; 1042 } 1043 1044 #undef ONE_PLUS 1045 #undef VALUE_COMMA 1046 #undef STRING_NULL 1047 #undef EACH_NAMED_CON 1048 #endif // PRODUCT 1049 1050 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1051 #ifndef PRODUCT 1052 if (advertise_con_value(which)) { 1053 assert(which >= 0 && which < con_value_count, ""); 1054 int con = con_values[which]; 1055 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1056 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1057 const char* str = &con_names[0]; 1058 for (int i = 0; i < which; i++) 1059 str += strlen(str) + 1; // skip name and null 1060 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1061 box->obj_at_put(0, name); 1062 } 1063 return con; 1064 } 1065 #endif 1066 return 0; 1067 } 1068 JVM_END 1069 1070 // void init(MemberName self, AccessibleObject ref) 1071 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1072 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1073 if (target_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1074 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1075 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1076 MethodHandles::init_MemberName(mname, target, CHECK); 1077 } 1078 JVM_END 1079 1080 // void expand(MemberName self) 1081 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1082 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1083 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1084 MethodHandles::expand_MemberName(mname, 0, CHECK); 1085 } 1086 JVM_END 1087 1088 // void resolve(MemberName self, Class<?> caller) 1089 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh, 1090 jint lookup_mode, jboolean speculative_resolve)) { 1091 if (mname_jh == nullptr) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1092 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1093 1094 // The trusted Java code that calls this method should already have performed 1095 // access checks on behalf of the given caller. But, we can verify this. 1096 // This only verifies from the context of the lookup class. It does not 1097 // verify the lookup context for a Lookup object teleported from one module 1098 // to another. Such Lookup object can only access the intersection of the set 1099 // of accessible classes from both lookup class and previous lookup class. 1100 if (VerifyMethodHandles && (lookup_mode & LM_TRUSTED) == LM_TRUSTED && caller_jh != nullptr && 1101 java_lang_invoke_MemberName::clazz(mname()) != nullptr) { 1102 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1103 if (reference_klass != nullptr && reference_klass->is_objArray_klass()) { 1104 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1105 } 1106 1107 // Reflection::verify_class_access can only handle instance classes. 1108 if (reference_klass != nullptr && reference_klass->is_instance_klass()) { 1109 // Emulate LinkResolver::check_klass_accessability. 1110 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1111 // access check on behalf of the caller if this is not a public lookup 1112 // i.e. lookup mode is not UNCONDITIONAL 1113 if ((lookup_mode & LM_UNCONDITIONAL) == 0 1114 && Reflection::verify_class_access(caller, 1115 InstanceKlass::cast(reference_klass), 1116 true) != Reflection::ACCESS_OK) { 1117 ResourceMark rm(THREAD); 1118 stringStream ss; 1119 ss.print("caller %s tried to access %s", caller->class_in_module_of_loader(), 1120 reference_klass->class_in_module_of_loader()); 1121 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), ss.as_string()); 1122 } 1123 } 1124 } 1125 1126 Klass* caller = caller_jh == nullptr ? nullptr : 1127 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1128 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, lookup_mode, 1129 speculative_resolve == JNI_TRUE, 1130 CHECK_NULL); 1131 1132 if (resolved.is_null()) { 1133 int flags = java_lang_invoke_MemberName::flags(mname()); 1134 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1135 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1136 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1137 } 1138 if (speculative_resolve) { 1139 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively"); 1140 return nullptr; 1141 } 1142 if ((flags & ALL_KINDS) == IS_FIELD) { 1143 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed"); 1144 } else if ((flags & ALL_KINDS) == IS_METHOD || 1145 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1146 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed"); 1147 } else { 1148 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1149 } 1150 } 1151 1152 return JNIHandles::make_local(THREAD, resolved()); 1153 } 1154 JVM_END 1155 1156 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1157 if (mname == nullptr || 1158 java_lang_invoke_MemberName::clazz(mname) == nullptr) { 1159 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1160 } else { 1161 int flags = java_lang_invoke_MemberName::flags(mname); 1162 if ((flags & IS_FIELD) != 0 && 1163 (must_be_static 1164 ? (flags & JVM_ACC_STATIC) != 0 1165 : (flags & JVM_ACC_STATIC) == 0)) { 1166 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname); 1167 return (jlong) vmindex; 1168 } 1169 } 1170 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1171 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1172 return 0; 1173 } 1174 1175 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1176 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1177 } 1178 JVM_END 1179 1180 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1181 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1182 } 1183 JVM_END 1184 1185 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1186 // use the other function to perform sanity checks: 1187 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1188 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1189 return JNIHandles::make_local(THREAD, clazz); 1190 } 1191 JVM_END 1192 1193 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1194 if (mname_jh == nullptr) return nullptr; 1195 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1196 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1197 objArrayHandle result = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 2, CHECK_NULL); 1198 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1199 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1200 result->obj_at_put(0, x); 1201 1202 int flags = java_lang_invoke_MemberName::flags(mname()); 1203 if ((flags & IS_FIELD) != 0) { 1204 x = java_lang_invoke_MemberName::clazz(mname()); 1205 } else { 1206 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1207 assert(vmtarget != nullptr && vmtarget->is_method(), "vmtarget is only method"); 1208 x = mname(); 1209 } 1210 result->obj_at_put(1, x); 1211 return JNIHandles::make_local(THREAD, result()); 1212 } 1213 JVM_END 1214 1215 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1216 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1217 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1218 DeoptimizationScope deopt_scope; 1219 { 1220 // Walk all nmethods depending on this call site. 1221 MutexLocker mu(thread, Compile_lock); 1222 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target); 1223 java_lang_invoke_CallSite::set_target(call_site(), target()); 1224 // This is assumed to be an 'atomic' operation by verification. 1225 // So keep it under lock for now. 1226 deopt_scope.deoptimize_marked(); 1227 } 1228 } 1229 JVM_END 1230 1231 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1232 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1233 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1234 DeoptimizationScope deopt_scope; 1235 { 1236 // Walk all nmethods depending on this call site. 1237 MutexLocker mu(thread, Compile_lock); 1238 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target); 1239 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1240 // This is assumed to be an 'atomic' operation by verification. 1241 // So keep it under lock for now. 1242 deopt_scope.deoptimize_marked(); 1243 } 1244 } 1245 JVM_END 1246 1247 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls, 1248 jobject caller_jh, jintArray index_info_jh, 1249 jint start, jint end, 1250 jobjectArray buf_jh, jint pos, 1251 jboolean resolve, jobject ifna_jh)) { 1252 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh)); 1253 if (caller_k == nullptr || !caller_k->is_instance_klass()) { 1254 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller"); 1255 } 1256 InstanceKlass* caller = InstanceKlass::cast(caller_k); 1257 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh); 1258 if (index_info_oop == nullptr || 1259 index_info_oop->klass() != Universe::intArrayKlassObj() || 1260 typeArrayOop(index_info_oop)->length() < 2) { 1261 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)"); 1262 } 1263 typeArrayHandle index_info(THREAD, index_info_oop); 1264 int bss_index_in_pool = index_info->int_at(1); 1265 // While we are here, take a quick look at the index info: 1266 if (bss_index_in_pool <= 0 || 1267 bss_index_in_pool >= caller->constants()->length() || 1268 index_info->int_at(0) 1269 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) { 1270 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)"); 1271 } 1272 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh)); 1273 if (start < 0) { 1274 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) { 1275 if (start == pseudo_index) { 1276 if (start >= end || 0 > pos || pos >= buf->length()) break; 1277 oop pseudo_arg = nullptr; 1278 switch (pseudo_index) { 1279 case -4: // bootstrap method 1280 { 1281 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool); 1282 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK); 1283 break; 1284 } 1285 case -3: // name 1286 { 1287 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic); 1288 Handle str = java_lang_String::create_from_symbol(name, CHECK); 1289 pseudo_arg = str(); 1290 break; 1291 } 1292 case -2: // type 1293 { 1294 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic); 1295 Handle th; 1296 if (type->char_at(0) == JVM_SIGNATURE_FUNC) { 1297 th = SystemDictionary::find_method_handle_type(type, caller, CHECK); 1298 } else { 1299 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK); 1300 } 1301 pseudo_arg = th(); 1302 break; 1303 } 1304 case -1: // argument count 1305 { 1306 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool); 1307 jvalue argc_value; argc_value.i = (jint)argc; 1308 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK); 1309 break; 1310 } 1311 } 1312 1313 // Store the pseudo-argument, and advance the pointers. 1314 buf->obj_at_put(pos++, pseudo_arg); 1315 ++start; 1316 } 1317 } 1318 // When we are done with this there may be regular arguments to process too. 1319 } 1320 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh)); 1321 caller->constants()-> 1322 copy_bootstrap_arguments_at(bss_index_in_pool, 1323 start, end, buf, pos, 1324 (resolve == JNI_TRUE), ifna, CHECK); 1325 } 1326 JVM_END 1327 1328 // It is called by a Cleaner object which ensures that dropped CallSites properly 1329 // deallocate their dependency information. 1330 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1331 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1332 DeoptimizationScope deopt_scope; 1333 { 1334 NoSafepointVerifier nsv; 1335 MutexLocker ml(THREAD, CodeCache_lock, Mutex::_no_safepoint_check_flag); 1336 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1337 deps.remove_and_mark_for_deoptimization_all_dependents(&deopt_scope); 1338 // This is assumed to be an 'atomic' operation by verification. 1339 // So keep it under lock for now. 1340 deopt_scope.deoptimize_marked(); 1341 } 1342 } 1343 JVM_END 1344 1345 /** 1346 * Throws a java/lang/UnsupportedOperationException unconditionally. 1347 * This is required by the specification of MethodHandle.invoke if 1348 * invoked directly. 1349 */ 1350 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1351 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1352 return nullptr; 1353 } 1354 JVM_END 1355 1356 /** 1357 * Throws a java/lang/UnsupportedOperationException unconditionally. 1358 * This is required by the specification of MethodHandle.invokeExact if 1359 * invoked directly. 1360 */ 1361 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1362 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1363 return nullptr; 1364 } 1365 JVM_END 1366 1367 /// JVM_RegisterMethodHandleMethods 1368 1369 #define LANG "Ljava/lang/" 1370 #define JLINV "Ljava/lang/invoke/" 1371 1372 #define OBJ LANG "Object;" 1373 #define CLS LANG "Class;" 1374 #define STRG LANG "String;" 1375 #define CS JLINV "CallSite;" 1376 #define MT JLINV "MethodType;" 1377 #define MH JLINV "MethodHandle;" 1378 #define MEM JLINV "MemberName;" 1379 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1380 1381 #define CC (char*) /*cast a literal from (const char*)*/ 1382 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1383 1384 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1385 static JNINativeMethod MHN_methods[] = { 1386 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1387 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1388 {CC "resolve", CC "(" MEM "" CLS "IZ)" MEM, FN_PTR(MHN_resolve_Mem)}, 1389 // static native int getNamedCon(int which, Object[] name) 1390 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1391 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1392 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1393 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1394 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)}, 1395 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1396 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1397 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1398 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1399 }; 1400 1401 static JNINativeMethod MH_methods[] = { 1402 // UnsupportedOperationException throwers 1403 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1404 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1405 }; 1406 1407 /** 1408 * This one function is exported, used by NativeLookup. 1409 */ 1410 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1411 assert(!MethodHandles::enabled(), "must not be enabled"); 1412 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present"); 1413 1414 oop mirror = vmClasses::MethodHandle_klass()->java_mirror(); 1415 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mirror); 1416 1417 { 1418 ThreadToNativeFromVM ttnfv(thread); 1419 1420 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1421 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1422 "register java.lang.invoke.MethodHandleNative natives"); 1423 1424 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1425 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1426 "register java.lang.invoke.MethodHandle natives"); 1427 } 1428 1429 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)"); 1430 1431 MethodHandles::set_enabled(true); 1432 } 1433 JVM_END