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