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_OBJECT_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_OBJECT_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 FLATTENED = java_lang_invoke_MemberName::MN_FLAT_FIELD, 142 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 143 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 144 LM_UNCONDITIONAL = java_lang_invoke_MemberName::MN_UNCONDITIONAL_MODE, 145 LM_MODULE = java_lang_invoke_MemberName::MN_MODULE_MODE, 146 LM_TRUSTED = java_lang_invoke_MemberName::MN_TRUSTED_MODE, 147 ALL_KINDS = IS_METHOD | IS_OBJECT_CONSTRUCTOR | IS_FIELD | IS_TYPE 148 }; 149 150 int MethodHandles::ref_kind_to_flags(int ref_kind) { 151 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind); 152 int flags = (ref_kind << REFERENCE_KIND_SHIFT); 153 if (ref_kind_is_field(ref_kind)) { 154 flags |= IS_FIELD; 155 } else if (ref_kind_is_method(ref_kind)) { 156 flags |= IS_METHOD; 157 } else if (ref_kind == JVM_REF_newInvokeSpecial) { 158 flags |= IS_OBJECT_CONSTRUCTOR; 159 } 160 return flags; 161 } 162 163 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) { 164 Handle empty; 165 Handle type(THREAD, java_lang_invoke_MemberName::type(mname())); 166 if (!java_lang_String::is_instance(type())) { 167 return type; // already resolved 168 } 169 Symbol* signature = java_lang_String::as_symbol_or_null(type()); 170 if (signature == nullptr) { 171 return empty; // no such signature exists in the VM 172 } 173 Handle resolved; 174 int flags = java_lang_invoke_MemberName::flags(mname()); 175 switch (flags & ALL_KINDS) { 176 case IS_METHOD: 177 case IS_OBJECT_CONSTRUCTOR: 178 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty)); 179 break; 180 case IS_FIELD: 181 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty)); 182 break; 183 default: 184 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 185 } 186 if (resolved.is_null()) { 187 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty); 188 } 189 return resolved; 190 } 191 192 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) { 193 // This method is used from java.lang.invoke.MemberName constructors. 194 // It fills in the new MemberName from a java.lang.reflect.Member. 195 oop target_oop = target(); 196 Klass* target_klass = target_oop->klass(); 197 if (target_klass == vmClasses::reflect_Field_klass()) { 198 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 199 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 200 Klass* k = java_lang_Class::as_Klass(clazz); 201 if (k != nullptr && k->is_instance_klass()) { 202 fieldDescriptor fd(InstanceKlass::cast(k), slot); 203 oop mname2 = init_field_MemberName(mname, fd); 204 if (mname2 != nullptr) { 205 // Since we have the reified name and type handy, add them to the result. 206 if (java_lang_invoke_MemberName::name(mname2) == nullptr) 207 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 208 if (java_lang_invoke_MemberName::type(mname2) == nullptr) 209 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 210 } 211 return mname2; 212 } 213 } else if (target_klass == vmClasses::reflect_Method_klass()) { 214 oop clazz = java_lang_reflect_Method::clazz(target_oop); 215 int slot = java_lang_reflect_Method::slot(target_oop); 216 Klass* k = java_lang_Class::as_Klass(clazz); 217 if (k != nullptr && k->is_instance_klass()) { 218 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 219 if (m == nullptr || is_signature_polymorphic(m->intrinsic_id())) 220 return nullptr; // do not resolve unless there is a concrete signature 221 CallInfo info(m, k, CHECK_NULL); 222 return init_method_MemberName(mname, info); 223 } 224 } else if (target_klass == vmClasses::reflect_Constructor_klass()) { 225 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 226 int slot = java_lang_reflect_Constructor::slot(target_oop); 227 Klass* k = java_lang_Class::as_Klass(clazz); 228 if (k != nullptr && k->is_instance_klass()) { 229 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 230 if (m == nullptr) return nullptr; 231 CallInfo info(m, k, CHECK_NULL); 232 return init_method_MemberName(mname, info); 233 } 234 } 235 return nullptr; 236 } 237 238 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 239 assert(info.resolved_appendix().is_null(), "only normal methods here"); 240 methodHandle m(Thread::current(), info.resolved_method()); 241 assert(m.not_null(), "null method handle"); 242 InstanceKlass* m_klass = m->method_holder(); 243 assert(m_klass != nullptr, "null holder for method handle"); 244 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 245 int vmindex = Method::invalid_vtable_index; 246 LogTarget(Debug, methodhandles, indy) lt_indy; 247 248 switch (info.call_kind()) { 249 case CallInfo::itable_call: 250 vmindex = info.itable_index(); 251 // More importantly, the itable index only works with the method holder. 252 assert(m_klass->verify_itable_index(vmindex), ""); 253 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 254 if (lt_indy.is_enabled()) { 255 ResourceMark rm; 256 LogStream ls(lt_indy); 257 ls.print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 258 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 259 vmindex); 260 m->access_flags().print_on(&ls); 261 if (!m->is_abstract()) { 262 if (!m->is_private()) { 263 ls.print("default"); 264 } 265 else { 266 ls.print("private-intf"); 267 } 268 } 269 ls.cr(); 270 } 271 break; 272 273 case CallInfo::vtable_call: 274 vmindex = info.vtable_index(); 275 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 276 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe"); 277 if (m_klass->is_interface()) { 278 // This is a vtable call to an interface method (abstract "miranda method" or default method). 279 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 280 // (LinkResolver should help us figure this out.) 281 assert(info.resolved_klass()->is_instance_klass(), "subtype of interface must be an instance klass"); 282 InstanceKlass* m_klass_non_interface = InstanceKlass::cast(info.resolved_klass()); 283 if (m_klass_non_interface->is_interface()) { 284 m_klass_non_interface = vmClasses::Object_klass(); 285 #ifdef ASSERT 286 { ResourceMark rm; 287 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex); 288 assert(m->name() == m2->name() && m->signature() == m2->signature(), 289 "at %d, %s != %s", vmindex, 290 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 291 } 292 #endif //ASSERT 293 } 294 if (!m->is_public()) { 295 assert(m->is_public(), "virtual call must be to public interface method"); 296 return nullptr; // elicit an error later in product build 297 } 298 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe"); 299 m_klass = m_klass_non_interface; 300 } 301 if (lt_indy.is_enabled()) { 302 ResourceMark rm; 303 LogStream ls(lt_indy); 304 ls.print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 305 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 306 m_klass->internal_name(), vmindex); 307 m->access_flags().print_on(&ls); 308 if (m->is_default_method()) { 309 ls.print("default"); 310 } 311 ls.cr(); 312 } 313 break; 314 315 case CallInfo::direct_call: 316 vmindex = Method::nonvirtual_vtable_index; 317 if (m->is_static()) { 318 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 319 } else if (m->is_object_constructor()) { 320 flags |= IS_OBJECT_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 321 } else { 322 // "special" reflects that this is a direct call, not that it 323 // necessarily originates from an invokespecial. We can also do 324 // direct calls for private and/or final non-static methods. 325 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 326 } 327 break; 328 329 default: assert(false, "bad CallInfo"); return nullptr; 330 } 331 332 // @CallerSensitive annotation detected 333 if (m->caller_sensitive()) { 334 flags |= CALLER_SENSITIVE; 335 } 336 337 Handle resolved_method = info.resolved_method_name(); 338 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m() || m->is_old(), 339 "Should not change after link resolution"); 340 341 oop mname_oop = mname(); 342 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 343 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method()); 344 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index 345 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror()); 346 // Note: name and type can be lazily computed by resolve_MemberName, 347 // if Java code needs them as resolved String and MethodType objects. 348 // If relevant, the vtable or itable value is stored as vmindex. 349 // This is done eagerly, since it is readily available without 350 // constructing any new objects. 351 return mname(); 352 } 353 354 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 355 InstanceKlass* ik = fd.field_holder(); 356 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 357 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 358 if (fd.is_trusted_final()) flags |= TRUSTED_FINAL; 359 if (fd.is_flat()) flags |= FLATTENED;; 360 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 361 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 362 363 oop mname_oop = mname(); 364 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 365 java_lang_invoke_MemberName::set_method (mname_oop, nullptr); 366 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 367 java_lang_invoke_MemberName::set_clazz (mname_oop, ik->java_mirror()); 368 369 oop type = field_signature_type_or_null(fd.signature()); 370 oop name = field_name_or_null(fd.name()); 371 if (name != nullptr) 372 java_lang_invoke_MemberName::set_name(mname_oop, name); 373 if (type != nullptr) 374 java_lang_invoke_MemberName::set_type(mname_oop, type); 375 // Note: name and type can be lazily computed by resolve_MemberName, 376 // if Java code needs them as resolved String and Class objects. 377 // Note that the incoming type oop might be pre-resolved (non-null). 378 // The base clazz and field offset (vmindex) must be eagerly stored, 379 // because they unambiguously identify the field. 380 // Although the fieldDescriptor::_index would also identify the field, 381 // we do not use it, because it is harder to decode. 382 // TO DO: maybe intern mname_oop 383 return mname(); 384 } 385 386 // JVM 2.9 Special Methods: 387 // A method is signature polymorphic if and only if all of the following conditions hold : 388 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes. 389 // * It has a single formal parameter of type Object[]. 390 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. 391 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 392 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 393 if (klass == nullptr) 394 return false; 395 // The following test will fail spuriously during bootstrap of MethodHandle itself: 396 // if (klass != vmClasses::MethodHandle_klass()) 397 // Test the name instead: 398 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() && 399 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { 400 return false; 401 } 402 403 // Look up signature polymorphic method with polymorphic return type 404 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 405 InstanceKlass* iklass = InstanceKlass::cast(klass); 406 Method* m = iklass->find_method(name, poly_sig); 407 if (m != nullptr) { 408 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 409 int flags = m->access_flags().as_int(); 410 if ((flags & required) == required) { 411 return true; 412 } 413 } 414 415 // Look up signature polymorphic method with non-polymorphic (non Object) return type 416 int me; 417 int ms = iklass->find_method_by_name(name, &me); 418 if (ms == -1) return false; 419 for (; ms < me; ms++) { 420 Method* m = iklass->methods()->at(ms); 421 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 422 int flags = m->access_flags().as_int(); 423 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 424 return true; 425 } 426 } 427 return false; 428 } 429 430 431 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 432 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid)); 433 switch (iid) { 434 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 435 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 436 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 437 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 438 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 439 case vmIntrinsics::_linkToNative: return vmSymbols::linkToNative_name(); 440 default: 441 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid)); 442 return 0; 443 } 444 } 445 446 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 447 switch(id) { 448 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 449 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 450 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 451 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 452 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 453 default: 454 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 455 return Bytecodes::_illegal; 456 } 457 } 458 459 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 460 switch (iid) { 461 case vmIntrinsics::_invokeBasic: return 0; 462 case vmIntrinsics::_linkToNative: return 0; 463 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 464 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 465 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 466 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 467 default: 468 fatal("unexpected intrinsic id: %d %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid)); 469 return 0; 470 } 471 } 472 473 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 474 vmSymbolID name_id = vmSymbols::find_sid(name); 475 switch (name_id) { 476 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 477 case VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 478 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 479 case VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 480 481 // There is one static signature-polymorphic method for each JVM invocation mode. 482 case VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 483 case VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 484 case VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 485 case VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 486 case VM_SYMBOL_ENUM_NAME(linkToNative_name): return vmIntrinsics::_linkToNative; 487 default: break; 488 } 489 490 // Cover the case of invokeExact and any future variants of invokeFoo. 491 Klass* mh_klass = vmClasses::klass_at(VM_CLASS_ID(MethodHandle_klass)); 492 if (mh_klass != nullptr && is_method_handle_invoke_name(mh_klass, name)) { 493 return vmIntrinsics::_invokeGeneric; 494 } 495 496 // Cover the case of methods on VarHandle. 497 Klass* vh_klass = vmClasses::klass_at(VM_CLASS_ID(VarHandle_klass)); 498 if (vh_klass != nullptr && is_method_handle_invoke_name(vh_klass, name)) { 499 return vmIntrinsics::_invokeGeneric; 500 } 501 502 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 503 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 504 return vmIntrinsics::_none; 505 } 506 507 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 508 if (klass != nullptr && 509 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() || 510 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { 511 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 512 if (iid != vmIntrinsics::_none) 513 return iid; 514 if (is_method_handle_invoke_name(klass, name)) 515 return vmIntrinsics::_invokeGeneric; 516 } 517 return vmIntrinsics::_none; 518 } 519 520 // Returns true if method is signature polymorphic and public 521 bool MethodHandles::is_signature_polymorphic_public_name(Klass* klass, Symbol* name) { 522 if (is_signature_polymorphic_name(klass, name)) { 523 InstanceKlass* iklass = InstanceKlass::cast(klass); 524 int me; 525 int ms = iklass->find_method_by_name(name, &me); 526 assert(ms != -1, ""); 527 for (; ms < me; ms++) { 528 Method* m = iklass->methods()->at(ms); 529 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS | JVM_ACC_PUBLIC; 530 int flags = m->access_flags().as_int(); 531 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 532 return true; 533 } 534 } 535 } 536 return false; 537 } 538 539 // convert the external string or reflective type to an internal signature 540 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 541 if (java_lang_invoke_MethodType::is_instance(type_str)) { 542 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found); 543 } else if (java_lang_Class::is_instance(type_str)) { 544 return java_lang_Class::as_signature(type_str, false); 545 } else if (java_lang_String::is_instance(type_str)) { 546 if (intern_if_not_found) { 547 return java_lang_String::as_symbol(type_str); 548 } else { 549 return java_lang_String::as_symbol_or_null(type_str); 550 } 551 } else { 552 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", nullptr); 553 } 554 } 555 556 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 557 enum { OBJ_SIG_LEN = 18 }; 558 559 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 560 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 561 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 562 for (SignatureStream ss(sig, sig->starts_with(JVM_SIGNATURE_FUNC)); !ss.is_done(); ss.next()) { 563 switch (ss.type()) { 564 case T_OBJECT: 565 // only java/lang/Object is valid here 566 if (strncmp((char*) ss.raw_bytes(), OBJ_SIG, OBJ_SIG_LEN) != 0) 567 return false; 568 break; 569 case T_VOID: 570 case T_INT: 571 case T_LONG: 572 case T_FLOAT: 573 case T_DOUBLE: 574 break; 575 default: 576 // subword types (T_BYTE etc.), Q-descriptors, arrays 577 return false; 578 } 579 } 580 return true; 581 } 582 583 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg) { 584 Symbol* bsig = nullptr; 585 if (sig == nullptr) { 586 return sig; 587 } else if (is_basic_type_signature(sig)) { 588 sig->increment_refcount(); 589 return sig; // that was easy 590 } else if (!sig->starts_with(JVM_SIGNATURE_FUNC)) { 591 BasicType bt = Signature::basic_type(sig); 592 if (is_subword_type(bt)) { 593 bsig = vmSymbols::int_signature(); 594 } else { 595 assert(is_reference_type(bt), "is_basic_type_signature was false"); 596 bsig = vmSymbols::object_signature(); 597 } 598 } else { 599 ResourceMark rm; 600 stringStream buffer(128); 601 buffer.put(JVM_SIGNATURE_FUNC); 602 int arg_pos = 0, keep_arg_pos = -1; 603 if (keep_last_arg) 604 keep_arg_pos = ArgumentCount(sig).size() - 1; 605 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 606 BasicType bt = ss.type(); 607 size_t this_arg_pos = buffer.size(); 608 if (ss.at_return_type()) { 609 buffer.put(JVM_SIGNATURE_ENDFUNC); 610 } 611 if (arg_pos == keep_arg_pos) { 612 buffer.write((char*) ss.raw_bytes(), 613 (int) ss.raw_length()); 614 } else if (is_reference_type(bt)) { 615 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 616 } else { 617 if (is_subword_type(bt)) 618 bt = T_INT; 619 buffer.put(type2char(bt)); 620 } 621 arg_pos++; 622 } 623 const char* sigstr = buffer.base(); 624 int siglen = (int) buffer.size(); 625 bsig = SymbolTable::new_symbol(sigstr, siglen); 626 } 627 assert(is_basic_type_signature(bsig) || 628 // detune assert in case the injected argument is not a basic type: 629 keep_last_arg, ""); 630 return bsig; 631 } 632 633 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 634 Symbol* sig) { 635 st = st ? st : tty; 636 bool prev_type = false; 637 bool is_method = (sig->char_at(0) == JVM_SIGNATURE_FUNC); 638 if (is_method) st->put(JVM_SIGNATURE_FUNC); 639 for (SignatureStream ss(sig, is_method); !ss.is_done(); ss.next()) { 640 if (ss.at_return_type()) 641 st->put(JVM_SIGNATURE_ENDFUNC); 642 else if (prev_type) 643 st->put(','); 644 const char* cp = (const char*) ss.raw_bytes(); 645 if (ss.is_array()) { 646 st->put(JVM_SIGNATURE_ARRAY); 647 if (ss.array_prefix_length() == 1) 648 st->put(cp[1]); 649 else 650 st->put(JVM_SIGNATURE_CLASS); 651 } else { 652 st->put(cp[0]); 653 } 654 } 655 } 656 657 658 659 static oop object_java_mirror() { 660 return vmClasses::Object_klass()->java_mirror(); 661 } 662 663 oop MethodHandles::field_name_or_null(Symbol* s) { 664 if (s == nullptr) return nullptr; 665 return StringTable::lookup(s); 666 } 667 668 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 669 if (s == nullptr) return nullptr; 670 BasicType bt = Signature::basic_type(s); 671 if (is_java_primitive(bt)) { 672 assert(s->utf8_length() == 1, ""); 673 return java_lang_Class::primitive_mirror(bt); 674 } 675 // Here are some more short cuts for common types. 676 // They are optional, since reference types can be resolved lazily. 677 if (bt == T_OBJECT) { 678 if (s == vmSymbols::object_signature()) { 679 return object_java_mirror(); 680 } else if (s == vmSymbols::class_signature()) { 681 return vmClasses::Class_klass()->java_mirror(); 682 } else if (s == vmSymbols::string_signature()) { 683 return vmClasses::String_klass()->java_mirror(); 684 } 685 } 686 return nullptr; 687 } 688 689 // An unresolved member name is a mere symbolic reference. 690 // Resolving it plants a vmtarget/vmindex in it, 691 // which refers directly to JVM internals. 692 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, int lookup_mode, 693 bool speculative_resolve, TRAPS) { 694 Handle empty; 695 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 696 697 if (java_lang_invoke_MemberName::vmtarget(mname()) != nullptr) { 698 // Already resolved. 699 DEBUG_ONLY(intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname())); 700 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 701 return mname; 702 } 703 704 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 705 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 706 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 707 int flags = java_lang_invoke_MemberName::flags(mname()); 708 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 709 if (!ref_kind_is_valid(ref_kind)) { 710 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 711 } 712 713 DEBUG_ONLY(intptr_t old_vmindex); 714 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 715 716 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 717 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 718 } 719 720 InstanceKlass* defc = nullptr; 721 { 722 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 723 if (defc_klass == nullptr) return empty; // a primitive; no resolution possible 724 if (!defc_klass->is_instance_klass()) { 725 if (!defc_klass->is_array_klass()) return empty; 726 defc_klass = vmClasses::Object_klass(); 727 } 728 defc = InstanceKlass::cast(defc_klass); 729 } 730 if (defc == nullptr) { 731 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 732 } 733 defc->link_class(CHECK_(empty)); // possible safepoint 734 735 // convert the external string name to an internal symbol 736 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 737 if (name == nullptr) return empty; // no such name 738 if (name == vmSymbols::class_initializer_name()) 739 return empty; // illegal name 740 741 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 742 if ((flags & ALL_KINDS) == IS_METHOD && 743 (defc == vmClasses::MethodHandle_klass() || defc == vmClasses::VarHandle_klass()) && 744 (ref_kind == JVM_REF_invokeVirtual || 745 ref_kind == JVM_REF_invokeSpecial || 746 // static invocation mode is required for _linkToVirtual, etc.: 747 ref_kind == JVM_REF_invokeStatic)) { 748 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 749 if (iid != vmIntrinsics::_none && 750 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 751 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 752 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 753 mh_invoke_id = iid; 754 } 755 } 756 757 // convert the external string or reflective type to an internal signature 758 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 759 if (type == nullptr) return empty; // no such signature exists in the VM 760 761 // skip access check if it's trusted lookup 762 LinkInfo::AccessCheck access_check = caller != nullptr ? 763 LinkInfo::AccessCheck::required : 764 LinkInfo::AccessCheck::skip; 765 // skip loader constraints if it's trusted lookup or a public lookup 766 LinkInfo::LoaderConstraintCheck loader_constraint_check = (caller != nullptr && (lookup_mode & LM_UNCONDITIONAL) == 0) ? 767 LinkInfo::LoaderConstraintCheck::required : 768 LinkInfo::LoaderConstraintCheck::skip; 769 770 // Time to do the lookup. 771 switch (flags & ALL_KINDS) { 772 case IS_METHOD: 773 { 774 CallInfo result; 775 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check); 776 { 777 assert(!HAS_PENDING_EXCEPTION, ""); 778 if (ref_kind == JVM_REF_invokeStatic) { 779 LinkResolver::resolve_static_call(result, 780 link_info, false, THREAD); 781 } else if (ref_kind == JVM_REF_invokeInterface) { 782 LinkResolver::resolve_interface_call(result, Handle(), defc, 783 link_info, false, THREAD); 784 } else if (mh_invoke_id != vmIntrinsics::_none) { 785 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 786 LinkResolver::resolve_handle_call(result, link_info, THREAD); 787 } else if (ref_kind == JVM_REF_invokeSpecial) { 788 LinkResolver::resolve_special_call(result, Handle(), 789 link_info, THREAD); 790 } else if (ref_kind == JVM_REF_invokeVirtual) { 791 LinkResolver::resolve_virtual_call(result, Handle(), defc, 792 link_info, false, THREAD); 793 } else { 794 assert(false, "ref_kind=%d", ref_kind); 795 } 796 if (HAS_PENDING_EXCEPTION) { 797 if (speculative_resolve) { 798 CLEAR_PENDING_EXCEPTION; 799 } 800 return empty; 801 } 802 } 803 if (result.resolved_appendix().not_null()) { 804 // The resolved MemberName must not be accompanied by an appendix argument, 805 // since there is no way to bind this value into the MemberName. 806 // Caller is responsible to prevent this from happening. 807 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 808 } 809 result.set_resolved_method_name(CHECK_(empty)); 810 oop mname2 = init_method_MemberName(mname, result); 811 return Handle(THREAD, mname2); 812 } 813 case IS_OBJECT_CONSTRUCTOR: 814 { 815 CallInfo result; 816 LinkInfo link_info(defc, name, type, caller, access_check, loader_constraint_check); 817 { 818 assert(!HAS_PENDING_EXCEPTION, ""); 819 if (name == vmSymbols::object_initializer_name() && type->is_void_method_signature()) { 820 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD); 821 } else if (name == vmSymbols::inline_factory_name()) { 822 LinkResolver::resolve_static_call(result, link_info, false, THREAD); 823 } else { 824 break; // will throw after end of switch 825 } 826 if (HAS_PENDING_EXCEPTION) { 827 if (speculative_resolve) { 828 CLEAR_PENDING_EXCEPTION; 829 } 830 return empty; 831 } 832 } 833 assert(result.is_statically_bound(), ""); 834 result.set_resolved_method_name(CHECK_(empty)); 835 oop mname2 = init_method_MemberName(mname, result); 836 return Handle(THREAD, mname2); 837 } 838 case IS_FIELD: 839 { 840 fieldDescriptor result; // find_field initializes fd if found 841 { 842 assert(!HAS_PENDING_EXCEPTION, ""); 843 LinkInfo link_info(defc, name, type, caller, LinkInfo::AccessCheck::skip, loader_constraint_check); 844 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 845 if (HAS_PENDING_EXCEPTION) { 846 if (speculative_resolve) { 847 CLEAR_PENDING_EXCEPTION; 848 } 849 return empty; 850 } 851 } 852 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 853 return Handle(THREAD, mname2); 854 } 855 default: 856 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 857 } 858 859 return empty; 860 } 861 862 // Conversely, a member name which is only initialized from JVM internals 863 // may have null defc, name, and type fields. 864 // Resolving it plants a vmtarget/vmindex in it, 865 // which refers directly to JVM internals. 866 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 867 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 868 869 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != nullptr); 870 bool have_name = (java_lang_invoke_MemberName::name(mname()) != nullptr); 871 bool have_type = (java_lang_invoke_MemberName::type(mname()) != nullptr); 872 int flags = java_lang_invoke_MemberName::flags(mname()); 873 874 if (suppress != 0) { 875 if (suppress & _suppress_defc) have_defc = true; 876 if (suppress & _suppress_name) have_name = true; 877 if (suppress & _suppress_type) have_type = true; 878 } 879 880 if (have_defc && have_name && have_type) return; // nothing needed 881 882 switch (flags & ALL_KINDS) { 883 case IS_METHOD: 884 case IS_OBJECT_CONSTRUCTOR: 885 { 886 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 887 if (vmtarget == nullptr) { 888 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 889 } 890 methodHandle m(THREAD, vmtarget); 891 DEBUG_ONLY(vmtarget = nullptr); // safety 892 if (!have_defc) { 893 InstanceKlass* defc = m->method_holder(); 894 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 895 } 896 if (!have_name) { 897 //not java_lang_String::create_from_symbol; let's intern member names 898 oop name = StringTable::intern(m->name(), CHECK); 899 java_lang_invoke_MemberName::set_name(mname(), name); 900 } 901 if (!have_type) { 902 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 903 java_lang_invoke_MemberName::set_type(mname(), type()); 904 } 905 return; 906 } 907 case IS_FIELD: 908 { 909 oop clazz = java_lang_invoke_MemberName::clazz(mname()); 910 if (clazz == nullptr) { 911 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)"); 912 } 913 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz)); 914 DEBUG_ONLY(clazz = nullptr); // safety 915 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 916 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 917 fieldDescriptor fd; // find_field initializes fd if found 918 if (!defc->find_field_from_offset(checked_cast<int>(vmindex), is_static, &fd)) 919 break; // cannot expand 920 if (!have_name) { 921 //not java_lang_String::create_from_symbol; let's intern member names 922 oop name = StringTable::intern(fd.name(), CHECK); 923 java_lang_invoke_MemberName::set_name(mname(), name); 924 } 925 if (!have_type) { 926 // If it is a primitive field type, don't mess with short strings like "I". 927 Handle type (THREAD, field_signature_type_or_null(fd.signature())); 928 if (type.is_null()) { 929 type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 930 } 931 java_lang_invoke_MemberName::set_type(mname(), type()); 932 } 933 return; 934 } 935 } 936 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 937 } 938 939 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 940 assert_locked_or_safepoint(CodeCache_lock); 941 942 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site); 943 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 944 // Try to purge stale entries on updates. 945 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 946 // in order to avoid memory leak, stale entries are purged whenever a dependency list 947 // is changed (both on addition and removal). Though memory reclamation is delayed, 948 // it avoids indefinite memory usage growth. 949 deps.add_dependent_nmethod(nm); 950 } 951 952 void MethodHandles::clean_dependency_context(oop call_site) { 953 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site); 954 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 955 deps.clean_unloading_dependents(); 956 } 957 958 void MethodHandles::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, Handle call_site, Handle target) { 959 assert_lock_strong(Compile_lock); 960 961 CallSiteDepChange changes(call_site, target); 962 { 963 NoSafepointVerifier nsv; 964 MutexLocker ml(CodeCache_lock, Mutex::_no_safepoint_check_flag); 965 966 oop context = java_lang_invoke_CallSite::context_no_keepalive(call_site()); 967 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 968 deps.mark_dependent_nmethods(deopt_scope, changes); 969 } 970 } 971 972 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) { 973 if (log_is_enabled(Info, methodhandles)) { 974 const char* name = vmIntrinsics::name_at(iid); 975 if (*name == '_') name += 1; 976 const size_t len = strlen(name) + 50; 977 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal); 978 const char* suffix = ""; 979 if (is_signature_polymorphic(iid)) { 980 if (is_signature_polymorphic_static(iid)) 981 suffix = "/static"; 982 else 983 suffix = "/private"; 984 } 985 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix); 986 trace_method_handle(_masm, qname); 987 // LSan appears unable to keep track of qname, ignore it. 988 LSAN_IGNORE_OBJECT(qname); 989 // Note: Don't free the allocated char array because it's used 990 // during runtime. 991 } 992 } 993 994 // 995 // Here are the native methods in java.lang.invoke.MethodHandleNatives 996 // They are the private interface between this JVM and the HotSpot-specific 997 // Java code that implements JSR 292 method handles. 998 // 999 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1000 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1001 // 1002 1003 #ifndef PRODUCT 1004 #define EACH_NAMED_CON(template, requirement) \ 1005 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1006 template(java_lang_invoke_MemberName,MN_IS_OBJECT_CONSTRUCTOR) \ 1007 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1008 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1009 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1010 template(java_lang_invoke_MemberName,MN_TRUSTED_FINAL) \ 1011 template(java_lang_invoke_MemberName,MN_HIDDEN_MEMBER) \ 1012 template(java_lang_invoke_MemberName,MN_FLAT_FIELD) \ 1013 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1014 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1015 template(java_lang_invoke_MemberName,MN_NESTMATE_CLASS) \ 1016 template(java_lang_invoke_MemberName,MN_HIDDEN_CLASS) \ 1017 template(java_lang_invoke_MemberName,MN_STRONG_LOADER_LINK) \ 1018 template(java_lang_invoke_MemberName,MN_ACCESS_VM_ANNOTATIONS) \ 1019 template(java_lang_invoke_MemberName,MN_MODULE_MODE) \ 1020 template(java_lang_invoke_MemberName,MN_UNCONDITIONAL_MODE) \ 1021 template(java_lang_invoke_MemberName,MN_TRUSTED_MODE) \ 1022 /*end*/ 1023 1024 #define IGNORE_REQ(req_expr) /* req_expr */ 1025 #define ONE_PLUS(scope,value) 1+ 1026 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1027 #define VALUE_COMMA(scope,value) scope::value, 1028 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1029 #define STRING_NULL(scope,value) #value "\0" 1030 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1031 1032 static bool advertise_con_value(int which) { 1033 if (which < 0) return false; 1034 bool ok = true; 1035 int count = 0; 1036 #define INC_COUNT(scope,value) \ 1037 ++count; 1038 #define CHECK_REQ(req_expr) \ 1039 if (which < count) return ok; \ 1040 ok = (req_expr); 1041 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1042 #undef INC_COUNT 1043 #undef CHECK_REQ 1044 assert(count == con_value_count, ""); 1045 if (which < count) return ok; 1046 return false; 1047 } 1048 1049 #undef ONE_PLUS 1050 #undef VALUE_COMMA 1051 #undef STRING_NULL 1052 #undef EACH_NAMED_CON 1053 #endif // PRODUCT 1054 1055 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1056 #ifndef PRODUCT 1057 if (advertise_con_value(which)) { 1058 assert(which >= 0 && which < con_value_count, ""); 1059 int con = con_values[which]; 1060 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1061 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1062 const char* str = &con_names[0]; 1063 for (int i = 0; i < which; i++) 1064 str += strlen(str) + 1; // skip name and null 1065 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1066 box->obj_at_put(0, name); 1067 } 1068 return con; 1069 } 1070 #endif 1071 return 0; 1072 } 1073 JVM_END 1074 1075 // void init(MemberName self, AccessibleObject ref) 1076 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1077 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1078 if (target_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1079 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1080 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1081 MethodHandles::init_MemberName(mname, target, CHECK); 1082 } 1083 JVM_END 1084 1085 // void expand(MemberName self) 1086 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1087 if (mname_jh == nullptr) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1088 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1089 MethodHandles::expand_MemberName(mname, 0, CHECK); 1090 } 1091 JVM_END 1092 1093 // void resolve(MemberName self, Class<?> caller) 1094 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh, 1095 jint lookup_mode, jboolean speculative_resolve)) { 1096 if (mname_jh == nullptr) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1097 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1098 1099 // The trusted Java code that calls this method should already have performed 1100 // access checks on behalf of the given caller. But, we can verify this. 1101 // This only verifies from the context of the lookup class. It does not 1102 // verify the lookup context for a Lookup object teleported from one module 1103 // to another. Such Lookup object can only access the intersection of the set 1104 // of accessible classes from both lookup class and previous lookup class. 1105 if (VerifyMethodHandles && (lookup_mode & LM_TRUSTED) == LM_TRUSTED && caller_jh != nullptr && 1106 java_lang_invoke_MemberName::clazz(mname()) != nullptr) { 1107 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1108 if (reference_klass != nullptr && reference_klass->is_objArray_klass()) { 1109 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1110 } 1111 1112 // Reflection::verify_class_access can only handle instance classes. 1113 if (reference_klass != nullptr && reference_klass->is_instance_klass()) { 1114 // Emulate LinkResolver::check_klass_accessability. 1115 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1116 // access check on behalf of the caller if this is not a public lookup 1117 // i.e. lookup mode is not UNCONDITIONAL 1118 if ((lookup_mode & LM_UNCONDITIONAL) == 0 1119 && Reflection::verify_class_access(caller, 1120 InstanceKlass::cast(reference_klass), 1121 true) != Reflection::ACCESS_OK) { 1122 ResourceMark rm(THREAD); 1123 stringStream ss; 1124 ss.print("caller %s tried to access %s", caller->class_in_module_of_loader(), 1125 reference_klass->class_in_module_of_loader()); 1126 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), ss.as_string()); 1127 } 1128 } 1129 } 1130 1131 Klass* caller = caller_jh == nullptr ? nullptr : 1132 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1133 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, lookup_mode, 1134 speculative_resolve == JNI_TRUE, 1135 CHECK_NULL); 1136 1137 if (resolved.is_null()) { 1138 int flags = java_lang_invoke_MemberName::flags(mname()); 1139 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1140 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1141 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1142 } 1143 if (speculative_resolve) { 1144 assert(!HAS_PENDING_EXCEPTION, "No exceptions expected when resolving speculatively"); 1145 return nullptr; 1146 } 1147 if ((flags & ALL_KINDS) == IS_FIELD) { 1148 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed"); 1149 } else if ((flags & ALL_KINDS) == IS_METHOD || 1150 (flags & ALL_KINDS) == IS_OBJECT_CONSTRUCTOR) { 1151 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed"); 1152 } else { 1153 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1154 } 1155 } 1156 1157 return JNIHandles::make_local(THREAD, resolved()); 1158 } 1159 JVM_END 1160 1161 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1162 if (mname == nullptr || 1163 java_lang_invoke_MemberName::clazz(mname) == nullptr) { 1164 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1165 } else { 1166 int flags = java_lang_invoke_MemberName::flags(mname); 1167 if ((flags & IS_FIELD) != 0 && 1168 (must_be_static 1169 ? (flags & JVM_ACC_STATIC) != 0 1170 : (flags & JVM_ACC_STATIC) == 0)) { 1171 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname); 1172 return (jlong) vmindex; 1173 } 1174 } 1175 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1176 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1177 return 0; 1178 } 1179 1180 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1181 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1182 } 1183 JVM_END 1184 1185 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1186 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1187 } 1188 JVM_END 1189 1190 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1191 // use the other function to perform sanity checks: 1192 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1193 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1194 return JNIHandles::make_local(THREAD, clazz); 1195 } 1196 JVM_END 1197 1198 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1199 if (mname_jh == nullptr) return nullptr; 1200 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1201 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1202 objArrayHandle result = oopFactory::new_objArray_handle(vmClasses::Object_klass(), 2, CHECK_NULL); 1203 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1204 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1205 result->obj_at_put(0, x); 1206 1207 int flags = java_lang_invoke_MemberName::flags(mname()); 1208 if ((flags & IS_FIELD) != 0) { 1209 x = java_lang_invoke_MemberName::clazz(mname()); 1210 } else { 1211 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1212 assert(vmtarget != nullptr && vmtarget->is_method(), "vmtarget is only method"); 1213 x = mname(); 1214 } 1215 result->obj_at_put(1, x); 1216 return JNIHandles::make_local(THREAD, result()); 1217 } 1218 JVM_END 1219 1220 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1221 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1222 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1223 DeoptimizationScope deopt_scope; 1224 { 1225 // Walk all nmethods depending on this call site. 1226 MutexLocker mu(thread, Compile_lock); 1227 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target); 1228 java_lang_invoke_CallSite::set_target(call_site(), target()); 1229 // This is assumed to be an 'atomic' operation by verification. 1230 // So keep it under lock for now. 1231 deopt_scope.deoptimize_marked(); 1232 } 1233 } 1234 JVM_END 1235 1236 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1237 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1238 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1239 DeoptimizationScope deopt_scope; 1240 { 1241 // Walk all nmethods depending on this call site. 1242 MutexLocker mu(thread, Compile_lock); 1243 MethodHandles::mark_dependent_nmethods(&deopt_scope, call_site, target); 1244 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1245 // This is assumed to be an 'atomic' operation by verification. 1246 // So keep it under lock for now. 1247 deopt_scope.deoptimize_marked(); 1248 } 1249 } 1250 JVM_END 1251 1252 JVM_ENTRY(void, MHN_copyOutBootstrapArguments(JNIEnv* env, jobject igcls, 1253 jobject caller_jh, jintArray index_info_jh, 1254 jint start, jint end, 1255 jobjectArray buf_jh, jint pos, 1256 jboolean resolve, jobject ifna_jh)) { 1257 Klass* caller_k = java_lang_Class::as_Klass(JNIHandles::resolve(caller_jh)); 1258 if (caller_k == nullptr || !caller_k->is_instance_klass()) { 1259 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad caller"); 1260 } 1261 InstanceKlass* caller = InstanceKlass::cast(caller_k); 1262 typeArrayOop index_info_oop = (typeArrayOop) JNIHandles::resolve(index_info_jh); 1263 if (index_info_oop == nullptr || 1264 index_info_oop->klass() != Universe::intArrayKlassObj() || 1265 typeArrayOop(index_info_oop)->length() < 2) { 1266 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (0)"); 1267 } 1268 typeArrayHandle index_info(THREAD, index_info_oop); 1269 int bss_index_in_pool = index_info->int_at(1); 1270 // While we are here, take a quick look at the index info: 1271 if (bss_index_in_pool <= 0 || 1272 bss_index_in_pool >= caller->constants()->length() || 1273 index_info->int_at(0) 1274 != caller->constants()->bootstrap_argument_count_at(bss_index_in_pool)) { 1275 THROW_MSG(vmSymbols::java_lang_InternalError(), "bad index info (1)"); 1276 } 1277 objArrayHandle buf(THREAD, (objArrayOop) JNIHandles::resolve(buf_jh)); 1278 if (start < 0) { 1279 for (int pseudo_index = -4; pseudo_index < 0; pseudo_index++) { 1280 if (start == pseudo_index) { 1281 if (start >= end || 0 > pos || pos >= buf->length()) break; 1282 oop pseudo_arg = nullptr; 1283 switch (pseudo_index) { 1284 case -4: // bootstrap method 1285 { 1286 int bsm_index = caller->constants()->bootstrap_method_ref_index_at(bss_index_in_pool); 1287 pseudo_arg = caller->constants()->resolve_possibly_cached_constant_at(bsm_index, CHECK); 1288 break; 1289 } 1290 case -3: // name 1291 { 1292 Symbol* name = caller->constants()->name_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic); 1293 Handle str = java_lang_String::create_from_symbol(name, CHECK); 1294 pseudo_arg = str(); 1295 break; 1296 } 1297 case -2: // type 1298 { 1299 Symbol* type = caller->constants()->signature_ref_at(bss_index_in_pool, Bytecodes::_invokedynamic); 1300 Handle th; 1301 if (type->char_at(0) == JVM_SIGNATURE_FUNC) { 1302 th = SystemDictionary::find_method_handle_type(type, caller, CHECK); 1303 } else { 1304 th = SystemDictionary::find_java_mirror_for_type(type, caller, SignatureStream::NCDFError, CHECK); 1305 } 1306 pseudo_arg = th(); 1307 break; 1308 } 1309 case -1: // argument count 1310 { 1311 int argc = caller->constants()->bootstrap_argument_count_at(bss_index_in_pool); 1312 jvalue argc_value; argc_value.i = (jint)argc; 1313 pseudo_arg = java_lang_boxing_object::create(T_INT, &argc_value, CHECK); 1314 break; 1315 } 1316 } 1317 1318 // Store the pseudo-argument, and advance the pointers. 1319 buf->obj_at_put(pos++, pseudo_arg); 1320 ++start; 1321 } 1322 } 1323 // When we are done with this there may be regular arguments to process too. 1324 } 1325 Handle ifna(THREAD, JNIHandles::resolve(ifna_jh)); 1326 caller->constants()-> 1327 copy_bootstrap_arguments_at(bss_index_in_pool, 1328 start, end, buf, pos, 1329 (resolve == JNI_TRUE), ifna, CHECK); 1330 } 1331 JVM_END 1332 1333 // It is called by a Cleaner object which ensures that dropped CallSites properly 1334 // deallocate their dependency information. 1335 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1336 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1337 DeoptimizationScope deopt_scope; 1338 { 1339 NoSafepointVerifier nsv; 1340 MutexLocker ml(THREAD, CodeCache_lock, Mutex::_no_safepoint_check_flag); 1341 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1342 deps.remove_and_mark_for_deoptimization_all_dependents(&deopt_scope); 1343 // This is assumed to be an 'atomic' operation by verification. 1344 // So keep it under lock for now. 1345 deopt_scope.deoptimize_marked(); 1346 } 1347 } 1348 JVM_END 1349 1350 /** 1351 * Throws a java/lang/UnsupportedOperationException unconditionally. 1352 * This is required by the specification of MethodHandle.invoke if 1353 * invoked directly. 1354 */ 1355 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1356 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1357 return nullptr; 1358 } 1359 JVM_END 1360 1361 /** 1362 * Throws a java/lang/UnsupportedOperationException unconditionally. 1363 * This is required by the specification of MethodHandle.invokeExact if 1364 * invoked directly. 1365 */ 1366 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1367 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1368 return nullptr; 1369 } 1370 JVM_END 1371 1372 /// JVM_RegisterMethodHandleMethods 1373 1374 #define LANG "Ljava/lang/" 1375 #define JLINV "Ljava/lang/invoke/" 1376 1377 #define OBJ LANG "Object;" 1378 #define CLS LANG "Class;" 1379 #define STRG LANG "String;" 1380 #define CS JLINV "CallSite;" 1381 #define MT JLINV "MethodType;" 1382 #define MH JLINV "MethodHandle;" 1383 #define MEM JLINV "MemberName;" 1384 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1385 1386 #define CC (char*) /*cast a literal from (const char*)*/ 1387 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1388 1389 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1390 static JNINativeMethod MHN_methods[] = { 1391 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1392 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1393 {CC "resolve", CC "(" MEM "" CLS "IZ)" MEM, FN_PTR(MHN_resolve_Mem)}, 1394 // static native int getNamedCon(int which, Object[] name) 1395 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1396 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1397 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1398 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1399 {CC "copyOutBootstrapArguments", CC "(" CLS "[III[" OBJ "IZ" OBJ ")V", FN_PTR(MHN_copyOutBootstrapArguments)}, 1400 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1401 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1402 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1403 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1404 }; 1405 1406 static JNINativeMethod MH_methods[] = { 1407 // UnsupportedOperationException throwers 1408 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1409 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1410 }; 1411 1412 /** 1413 * This one function is exported, used by NativeLookup. 1414 */ 1415 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1416 assert(!MethodHandles::enabled(), "must not be enabled"); 1417 assert(vmClasses::MethodHandle_klass() != nullptr, "should be present"); 1418 1419 oop mirror = vmClasses::MethodHandle_klass()->java_mirror(); 1420 jclass MH_class = (jclass) JNIHandles::make_local(THREAD, mirror); 1421 1422 { 1423 ThreadToNativeFromVM ttnfv(thread); 1424 1425 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1426 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1427 "register java.lang.invoke.MethodHandleNative natives"); 1428 1429 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1430 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1431 "register java.lang.invoke.MethodHandle natives"); 1432 } 1433 1434 log_debug(methodhandles, indy)("MethodHandle support loaded (using LambdaForms)"); 1435 1436 MethodHandles::set_enabled(true); 1437 } 1438 JVM_END