1 /* 2 * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaClasses.inline.hpp" 27 #include "classfile/stringTable.hpp" 28 #include "code/codeCache.hpp" 29 #include "code/codeCacheExtensions.hpp" 30 #include "code/dependencyContext.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "interpreter/interpreter.hpp" 33 #include "interpreter/oopMapCache.hpp" 34 #include "interpreter/linkResolver.hpp" 35 #include "memory/allocation.inline.hpp" 36 #include "memory/oopFactory.hpp" 37 #include "memory/resourceArea.hpp" 38 #include "oops/objArrayOop.inline.hpp" 39 #include "oops/oop.inline.hpp" 40 #include "prims/methodHandles.hpp" 41 #include "runtime/compilationPolicy.hpp" 42 #include "runtime/javaCalls.hpp" 43 #include "runtime/timerTrace.hpp" 44 #include "runtime/reflection.hpp" 45 #include "runtime/signature.hpp" 46 #include "runtime/stubRoutines.hpp" 47 #include "utilities/exceptions.hpp" 48 49 50 /* 51 * JSR 292 reference implementation: method handles 52 * The JDK 7 reference implementation represented method handle 53 * combinations as chains. Each link in the chain had a "vmentry" 54 * field which pointed at a bit of assembly code which performed 55 * one transformation before dispatching to the next link in the chain. 56 * 57 * The current reference implementation pushes almost all code generation 58 * responsibility to (trusted) Java code. A method handle contains a 59 * pointer to its "LambdaForm", which embodies all details of the method 60 * handle's behavior. The LambdaForm is a normal Java object, managed 61 * by a runtime coded in Java. 62 */ 63 64 bool MethodHandles::_enabled = false; // set true after successful native linkage 65 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 66 67 /** 68 * Generates method handle adapters. Returns 'false' if memory allocation 69 * failed and true otherwise. 70 */ 71 void MethodHandles::generate_adapters() { 72 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 73 assert(_adapter_code == NULL, "generate only once"); 74 75 ResourceMark rm; 76 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime)); 77 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 78 CodeBuffer code(_adapter_code); 79 MethodHandlesAdapterGenerator g(&code); 80 g.generate(); 81 code.log_section_sizes("MethodHandlesAdapterBlob"); 82 } 83 84 //------------------------------------------------------------------------------ 85 // MethodHandlesAdapterGenerator::generate 86 // 87 void MethodHandlesAdapterGenerator::generate() { 88 // Generate generic method handle adapters. 89 // Generate interpreter entries 90 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 91 mk <= Interpreter::method_handle_invoke_LAST; 92 mk = Interpreter::MethodKind(1 + (int)mk)) { 93 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 94 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 95 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 96 if (entry != NULL) { 97 CodeCacheExtensions::handle_generated_pc(entry, vmIntrinsics::name_at(iid)); 98 Interpreter::set_entry_for_kind(mk, entry); 99 } 100 // If the entry is not set, it will throw AbstractMethodError. 101 } 102 } 103 104 void MethodHandles::set_enabled(bool z) { 105 if (_enabled != z) { 106 guarantee(z, "can only enable once"); 107 _enabled = z; 108 } 109 } 110 111 // MemberName support 112 113 // import java_lang_invoke_MemberName.* 114 enum { 115 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 116 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 117 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 118 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 119 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 120 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 121 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 122 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 123 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 124 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 125 }; 126 127 Handle MethodHandles::new_MemberName(TRAPS) { 128 Handle empty; 129 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 130 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 131 return Handle(THREAD, k->allocate_instance(THREAD)); 132 } 133 134 oop MethodHandles::init_MemberName(Handle mname, Handle target) { 135 // This method is used from java.lang.invoke.MemberName constructors. 136 // It fills in the new MemberName from a java.lang.reflect.Member. 137 Thread* thread = Thread::current(); 138 oop target_oop = target(); 139 Klass* target_klass = target_oop->klass(); 140 if (target_klass == SystemDictionary::reflect_Field_klass()) { 141 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 142 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 143 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 144 if (!k.is_null() && k->is_instance_klass()) { 145 fieldDescriptor fd(InstanceKlass::cast(k()), slot); 146 oop mname2 = init_field_MemberName(mname, fd); 147 if (mname2 != NULL) { 148 // Since we have the reified name and type handy, add them to the result. 149 if (java_lang_invoke_MemberName::name(mname2) == NULL) 150 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 151 if (java_lang_invoke_MemberName::type(mname2) == NULL) 152 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 153 } 154 return mname2; 155 } 156 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 157 oop clazz = java_lang_reflect_Method::clazz(target_oop); 158 int slot = java_lang_reflect_Method::slot(target_oop); 159 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 160 if (!k.is_null() && k->is_instance_klass()) { 161 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 162 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 163 return NULL; // do not resolve unless there is a concrete signature 164 CallInfo info(m, k()); 165 return init_method_MemberName(mname, info); 166 } 167 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 168 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 169 int slot = java_lang_reflect_Constructor::slot(target_oop); 170 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 171 if (!k.is_null() && k->is_instance_klass()) { 172 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 173 if (m == NULL) return NULL; 174 CallInfo info(m, k()); 175 return init_method_MemberName(mname, info); 176 } 177 } 178 return NULL; 179 } 180 181 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, bool intern) { 182 assert(info.resolved_appendix().is_null(), "only normal methods here"); 183 methodHandle m = info.resolved_method(); 184 assert(m.not_null(), "null method handle"); 185 KlassHandle m_klass = m->method_holder(); 186 assert(m.not_null(), "null holder for method handle"); 187 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 188 int vmindex = Method::invalid_vtable_index; 189 190 switch (info.call_kind()) { 191 case CallInfo::itable_call: 192 vmindex = info.itable_index(); 193 // More importantly, the itable index only works with the method holder. 194 assert(m_klass->verify_itable_index(vmindex), ""); 195 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 196 if (TraceInvokeDynamic) { 197 ttyLocker ttyl; 198 ResourceMark rm; 199 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 200 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 201 vmindex); 202 m->access_flags().print_on(tty); 203 if (!m->is_abstract()) { 204 tty->print("default"); 205 } 206 tty->cr(); 207 } 208 break; 209 210 case CallInfo::vtable_call: 211 vmindex = info.vtable_index(); 212 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 213 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe"); 214 if (m_klass->is_interface()) { 215 // This is a vtable call to an interface method (abstract "miranda method" or default method). 216 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 217 // (LinkResolver should help us figure this out.) 218 KlassHandle m_klass_non_interface = info.resolved_klass(); 219 if (m_klass_non_interface->is_interface()) { 220 m_klass_non_interface = SystemDictionary::Object_klass(); 221 #ifdef ASSERT 222 { ResourceMark rm; 223 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex); 224 assert(m->name() == m2->name() && m->signature() == m2->signature(), 225 "at %d, %s != %s", vmindex, 226 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 227 } 228 #endif //ASSERT 229 } 230 if (!m->is_public()) { 231 assert(m->is_public(), "virtual call must be to public interface method"); 232 return NULL; // elicit an error later in product build 233 } 234 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe"); 235 m_klass = m_klass_non_interface; 236 } 237 if (TraceInvokeDynamic) { 238 ttyLocker ttyl; 239 ResourceMark rm; 240 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 241 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 242 m_klass->internal_name(), vmindex); 243 m->access_flags().print_on(tty); 244 if (m->is_default_method()) { 245 tty->print("default"); 246 } 247 tty->cr(); 248 } 249 break; 250 251 case CallInfo::direct_call: 252 vmindex = Method::nonvirtual_vtable_index; 253 if (m->is_static()) { 254 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 255 } else if (m->is_initializer()) { 256 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 257 } else { 258 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 259 } 260 break; 261 262 default: assert(false, "bad CallInfo"); return NULL; 263 } 264 265 // @CallerSensitive annotation detected 266 if (m->caller_sensitive()) { 267 flags |= CALLER_SENSITIVE; 268 } 269 270 oop mname_oop = mname(); 271 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 272 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); 273 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 274 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror()); 275 // Note: name and type can be lazily computed by resolve_MemberName, 276 // if Java code needs them as resolved String and MethodType objects. 277 // The clazz must be eagerly stored, because it provides a GC 278 // root to help keep alive the Method*. 279 // If relevant, the vtable or itable value is stored as vmindex. 280 // This is done eagerly, since it is readily available without 281 // constructing any new objects. 282 return m->method_holder()->add_member_name(mname, intern); 283 } 284 285 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 286 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 287 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 288 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 289 Metadata* vmtarget = fd.field_holder(); 290 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 291 oop mname_oop = mname(); 292 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 293 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 294 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 295 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); 296 oop type = field_signature_type_or_null(fd.signature()); 297 oop name = field_name_or_null(fd.name()); 298 if (name != NULL) 299 java_lang_invoke_MemberName::set_name(mname_oop, name); 300 if (type != NULL) 301 java_lang_invoke_MemberName::set_type(mname_oop, type); 302 // Note: name and type can be lazily computed by resolve_MemberName, 303 // if Java code needs them as resolved String and Class objects. 304 // Note that the incoming type oop might be pre-resolved (non-null). 305 // The base clazz and field offset (vmindex) must be eagerly stored, 306 // because they unambiguously identify the field. 307 // Although the fieldDescriptor::_index would also identify the field, 308 // we do not use it, because it is harder to decode. 309 // TO DO: maybe intern mname_oop 310 return mname(); 311 } 312 313 // JVM 2.9 Special Methods: 314 // A method is signature polymorphic if and only if all of the following conditions hold : 315 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes. 316 // * It has a single formal parameter of type Object[]. 317 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. 318 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 319 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 320 if (klass == NULL) 321 return false; 322 // The following test will fail spuriously during bootstrap of MethodHandle itself: 323 // if (klass != SystemDictionary::MethodHandle_klass()) 324 // Test the name instead: 325 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() && 326 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { 327 return false; 328 } 329 330 // Look up signature polymorphic method with polymorphic return type 331 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 332 InstanceKlass* iklass = InstanceKlass::cast(klass); 333 Method* m = iklass->find_method(name, poly_sig); 334 if (m != NULL) { 335 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 336 int flags = m->access_flags().as_int(); 337 if ((flags & required) == required) { 338 return true; 339 } 340 } 341 342 // Look up signature polymorphic method with non-polymorphic (non Object) return type 343 int me; 344 int ms = iklass->find_method_by_name(name, &me); 345 if (ms == -1) return false; 346 for (; ms < me; ms++) { 347 Method* m = iklass->methods()->at(ms); 348 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 349 int flags = m->access_flags().as_int(); 350 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 351 return true; 352 } 353 } 354 return false; 355 } 356 357 358 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 359 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 360 switch (iid) { 361 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 362 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 363 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 364 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 365 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 366 } 367 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 368 return 0; 369 } 370 371 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 372 switch(id) { 373 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 374 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 375 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 376 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 377 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 378 default: 379 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 380 return Bytecodes::_illegal; 381 } 382 } 383 384 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 385 switch (iid) { 386 case vmIntrinsics::_invokeBasic: return 0; 387 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 388 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 389 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 390 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 391 } 392 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 393 return 0; 394 } 395 396 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 397 vmSymbols::SID name_id = vmSymbols::find_sid(name); 398 switch (name_id) { 399 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 400 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 401 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 402 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 403 404 // There is one static signature-polymorphic method for each JVM invocation mode. 405 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 406 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 407 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 408 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 409 } 410 411 // Cover the case of invokeExact and any future variants of invokeFoo. 412 Klass* mh_klass = SystemDictionary::well_known_klass( 413 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 414 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) { 415 return vmIntrinsics::_invokeGeneric; 416 } 417 418 // Cover the case of methods on VarHandle. 419 Klass* vh_klass = SystemDictionary::well_known_klass( 420 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) ); 421 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) { 422 return vmIntrinsics::_invokeGeneric; 423 } 424 425 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 426 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 427 return vmIntrinsics::_none; 428 } 429 430 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 431 if (klass != NULL && 432 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() || 433 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { 434 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 435 if (iid != vmIntrinsics::_none) 436 return iid; 437 if (is_method_handle_invoke_name(klass, name)) 438 return vmIntrinsics::_invokeGeneric; 439 } 440 return vmIntrinsics::_none; 441 } 442 443 444 // convert the external string or reflective type to an internal signature 445 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 446 if (java_lang_invoke_MethodType::is_instance(type_str)) { 447 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 448 } else if (java_lang_Class::is_instance(type_str)) { 449 return java_lang_Class::as_signature(type_str, false, THREAD); 450 } else if (java_lang_String::is_instance_inlined(type_str)) { 451 if (intern_if_not_found) { 452 return java_lang_String::as_symbol(type_str, THREAD); 453 } else { 454 return java_lang_String::as_symbol_or_null(type_str); 455 } 456 } else { 457 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 458 } 459 } 460 461 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 462 enum { OBJ_SIG_LEN = 18 }; 463 464 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 465 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 466 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 467 const int len = sig->utf8_length(); 468 for (int i = 0; i < len; i++) { 469 switch (sig->byte_at(i)) { 470 case 'L': 471 // only java/lang/Object is valid here 472 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 473 return false; 474 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 475 continue; 476 case '(': case ')': case 'V': 477 case 'I': case 'J': case 'F': case 'D': 478 continue; 479 //case '[': 480 //case 'Z': case 'B': case 'C': case 'S': 481 default: 482 return false; 483 } 484 } 485 return true; 486 } 487 488 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 489 Symbol* bsig = NULL; 490 if (sig == NULL) { 491 return sig; 492 } else if (is_basic_type_signature(sig)) { 493 sig->increment_refcount(); 494 return sig; // that was easy 495 } else if (sig->byte_at(0) != '(') { 496 BasicType bt = char2type(sig->byte_at(0)); 497 if (is_subword_type(bt)) { 498 bsig = vmSymbols::int_signature(); 499 } else { 500 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 501 bsig = vmSymbols::object_signature(); 502 } 503 } else { 504 ResourceMark rm; 505 stringStream buffer(128); 506 buffer.put('('); 507 int arg_pos = 0, keep_arg_pos = -1; 508 if (keep_last_arg) 509 keep_arg_pos = ArgumentCount(sig).size() - 1; 510 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 511 BasicType bt = ss.type(); 512 size_t this_arg_pos = buffer.size(); 513 if (ss.at_return_type()) { 514 buffer.put(')'); 515 } 516 if (arg_pos == keep_arg_pos) { 517 buffer.write((char*) ss.raw_bytes(), 518 (int) ss.raw_length()); 519 } else if (bt == T_OBJECT || bt == T_ARRAY) { 520 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 521 } else { 522 if (is_subword_type(bt)) 523 bt = T_INT; 524 buffer.put(type2char(bt)); 525 } 526 arg_pos++; 527 } 528 const char* sigstr = buffer.base(); 529 int siglen = (int) buffer.size(); 530 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 531 } 532 assert(is_basic_type_signature(bsig) || 533 // detune assert in case the injected argument is not a basic type: 534 keep_last_arg, ""); 535 return bsig; 536 } 537 538 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 539 Symbol* sig, 540 bool keep_arrays, 541 bool keep_basic_names) { 542 st = st ? st : tty; 543 int len = sig->utf8_length(); 544 int array = 0; 545 bool prev_type = false; 546 for (int i = 0; i < len; i++) { 547 char ch = sig->byte_at(i); 548 switch (ch) { 549 case '(': case ')': 550 prev_type = false; 551 st->put(ch); 552 continue; 553 case '[': 554 if (!keep_basic_names && keep_arrays) 555 st->put(ch); 556 array++; 557 continue; 558 case 'L': 559 { 560 if (prev_type) st->put(','); 561 int start = i+1, slash = start; 562 while (++i < len && (ch = sig->byte_at(i)) != ';') { 563 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 564 } 565 if (slash < i) start = slash; 566 if (!keep_basic_names) { 567 st->put('L'); 568 } else { 569 for (int j = start; j < i; j++) 570 st->put(sig->byte_at(j)); 571 prev_type = true; 572 } 573 break; 574 } 575 default: 576 { 577 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 578 ch = '['; 579 array = 0; 580 } 581 if (prev_type) st->put(','); 582 const char* n = NULL; 583 if (keep_basic_names) 584 n = type2name(char2type(ch)); 585 if (n == NULL) { 586 // unknown letter, or we don't want to know its name 587 st->put(ch); 588 } else { 589 st->print("%s", n); 590 prev_type = true; 591 } 592 break; 593 } 594 } 595 // Switch break goes here to take care of array suffix: 596 if (prev_type) { 597 while (array > 0) { 598 st->print("[]"); 599 --array; 600 } 601 } 602 array = 0; 603 } 604 } 605 606 607 608 static oop object_java_mirror() { 609 return SystemDictionary::Object_klass()->java_mirror(); 610 } 611 612 oop MethodHandles::field_name_or_null(Symbol* s) { 613 if (s == NULL) return NULL; 614 return StringTable::lookup(s); 615 } 616 617 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 618 if (s == NULL) return NULL; 619 BasicType bt = FieldType::basic_type(s); 620 if (is_java_primitive(bt)) { 621 assert(s->utf8_length() == 1, ""); 622 return java_lang_Class::primitive_mirror(bt); 623 } 624 // Here are some more short cuts for common types. 625 // They are optional, since reference types can be resolved lazily. 626 if (bt == T_OBJECT) { 627 if (s == vmSymbols::object_signature()) { 628 return object_java_mirror(); 629 } else if (s == vmSymbols::class_signature()) { 630 return SystemDictionary::Class_klass()->java_mirror(); 631 } else if (s == vmSymbols::string_signature()) { 632 return SystemDictionary::String_klass()->java_mirror(); 633 } 634 } 635 return NULL; 636 } 637 638 639 // An unresolved member name is a mere symbolic reference. 640 // Resolving it plants a vmtarget/vmindex in it, 641 // which refers directly to JVM internals. 642 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, bool clear_pending, TRAPS) { 643 Handle empty; 644 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 645 646 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 647 // Already resolved. 648 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 649 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 650 return mname; 651 } 652 653 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 654 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 655 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 656 int flags = java_lang_invoke_MemberName::flags(mname()); 657 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 658 if (!ref_kind_is_valid(ref_kind)) { 659 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 660 } 661 662 DEBUG_ONLY(int old_vmindex); 663 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 664 665 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 666 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 667 } 668 669 instanceKlassHandle defc; 670 { 671 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 672 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 673 if (!defc_klass->is_instance_klass()) { 674 if (!defc_klass->is_array_klass()) return empty; 675 defc_klass = SystemDictionary::Object_klass(); 676 } 677 defc = instanceKlassHandle(THREAD, defc_klass); 678 } 679 if (defc.is_null()) { 680 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 681 } 682 defc->link_class(CHECK_(empty)); // possible safepoint 683 684 // convert the external string name to an internal symbol 685 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 686 if (name == NULL) return empty; // no such name 687 if (name == vmSymbols::class_initializer_name()) 688 return empty; // illegal name 689 690 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 691 if ((flags & ALL_KINDS) == IS_METHOD && 692 (defc() == SystemDictionary::MethodHandle_klass()) && 693 (ref_kind == JVM_REF_invokeVirtual || 694 ref_kind == JVM_REF_invokeSpecial || 695 // static invocation mode is required for _linkToVirtual, etc.: 696 ref_kind == JVM_REF_invokeStatic)) { 697 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 698 if (iid != vmIntrinsics::_none && 699 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 700 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 701 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 702 mh_invoke_id = iid; 703 } 704 } 705 706 // convert the external string or reflective type to an internal signature 707 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 708 if (type == NULL) return empty; // no such signature exists in the VM 709 710 LinkInfo::AccessCheck access_check = caller.not_null() ? 711 LinkInfo::needs_access_check : 712 LinkInfo::skip_access_check; 713 714 // Time to do the lookup. 715 switch (flags & ALL_KINDS) { 716 case IS_METHOD: 717 { 718 CallInfo result; 719 LinkInfo link_info(defc, name, type, caller, access_check); 720 { 721 assert(!HAS_PENDING_EXCEPTION, ""); 722 if (ref_kind == JVM_REF_invokeStatic) { 723 LinkResolver::resolve_static_call(result, 724 link_info, false, THREAD); 725 } else if (ref_kind == JVM_REF_invokeInterface) { 726 LinkResolver::resolve_interface_call(result, Handle(), defc, 727 link_info, false, THREAD); 728 } else if (mh_invoke_id != vmIntrinsics::_none) { 729 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 730 LinkResolver::resolve_handle_call(result, link_info, THREAD); 731 } else if (ref_kind == JVM_REF_invokeSpecial) { 732 LinkResolver::resolve_special_call(result, 733 link_info, THREAD); 734 } else if (ref_kind == JVM_REF_invokeVirtual) { 735 LinkResolver::resolve_virtual_call(result, Handle(), defc, 736 link_info, false, THREAD); 737 } else { 738 assert(false, "ref_kind=%d", ref_kind); 739 } 740 if (HAS_PENDING_EXCEPTION) { 741 if (clear_pending) CLEAR_PENDING_EXCEPTION; 742 return empty; 743 } 744 } 745 if (result.resolved_appendix().not_null()) { 746 // The resolved MemberName must not be accompanied by an appendix argument, 747 // since there is no way to bind this value into the MemberName. 748 // Caller is responsible to prevent this from happening. 749 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 750 } 751 oop mname2 = init_method_MemberName(mname, result); 752 return Handle(THREAD, mname2); 753 } 754 case IS_CONSTRUCTOR: 755 { 756 CallInfo result; 757 LinkInfo link_info(defc, name, type, caller, access_check); 758 { 759 assert(!HAS_PENDING_EXCEPTION, ""); 760 if (name == vmSymbols::object_initializer_name()) { 761 LinkResolver::resolve_special_call(result, link_info, THREAD); 762 } else { 763 break; // will throw after end of switch 764 } 765 if (HAS_PENDING_EXCEPTION) { 766 if (clear_pending) CLEAR_PENDING_EXCEPTION; 767 return empty; 768 } 769 } 770 assert(result.is_statically_bound(), ""); 771 oop mname2 = init_method_MemberName(mname, result); 772 return Handle(THREAD, mname2); 773 } 774 case IS_FIELD: 775 { 776 fieldDescriptor result; // find_field initializes fd if found 777 { 778 assert(!HAS_PENDING_EXCEPTION, ""); 779 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check); 780 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 781 if (HAS_PENDING_EXCEPTION) { 782 if (clear_pending) CLEAR_PENDING_EXCEPTION; 783 return empty; 784 } 785 } 786 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 787 return Handle(THREAD, mname2); 788 } 789 default: 790 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 791 } 792 793 return empty; 794 } 795 796 // Conversely, a member name which is only initialized from JVM internals 797 // may have null defc, name, and type fields. 798 // Resolving it plants a vmtarget/vmindex in it, 799 // which refers directly to JVM internals. 800 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 801 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 802 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 803 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 804 if (vmtarget == NULL) { 805 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 806 } 807 808 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 809 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 810 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 811 int flags = java_lang_invoke_MemberName::flags(mname()); 812 813 if (suppress != 0) { 814 if (suppress & _suppress_defc) have_defc = true; 815 if (suppress & _suppress_name) have_name = true; 816 if (suppress & _suppress_type) have_type = true; 817 } 818 819 if (have_defc && have_name && have_type) return; // nothing needed 820 821 switch (flags & ALL_KINDS) { 822 case IS_METHOD: 823 case IS_CONSTRUCTOR: 824 { 825 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 826 methodHandle m(THREAD, (Method*)vmtarget); 827 DEBUG_ONLY(vmtarget = NULL); // safety 828 if (m.is_null()) break; 829 if (!have_defc) { 830 InstanceKlass* defc = m->method_holder(); 831 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 832 } 833 if (!have_name) { 834 //not java_lang_String::create_from_symbol; let's intern member names 835 Handle name = StringTable::intern(m->name(), CHECK); 836 java_lang_invoke_MemberName::set_name(mname(), name()); 837 } 838 if (!have_type) { 839 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 840 java_lang_invoke_MemberName::set_type(mname(), type()); 841 } 842 return; 843 } 844 case IS_FIELD: 845 { 846 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 847 if (!((Klass*) vmtarget)->is_instance_klass()) break; 848 instanceKlassHandle defc(THREAD, (Klass*) vmtarget); 849 DEBUG_ONLY(vmtarget = NULL); // safety 850 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 851 fieldDescriptor fd; // find_field initializes fd if found 852 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 853 break; // cannot expand 854 if (!have_defc) { 855 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 856 } 857 if (!have_name) { 858 //not java_lang_String::create_from_symbol; let's intern member names 859 Handle name = StringTable::intern(fd.name(), CHECK); 860 java_lang_invoke_MemberName::set_name(mname(), name()); 861 } 862 if (!have_type) { 863 // If it is a primitive field type, don't mess with short strings like "I". 864 Handle type = field_signature_type_or_null(fd.signature()); 865 if (type.is_null()) { 866 java_lang_String::create_from_symbol(fd.signature(), CHECK); 867 } 868 java_lang_invoke_MemberName::set_type(mname(), type()); 869 } 870 return; 871 } 872 } 873 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 874 } 875 876 int MethodHandles::find_MemberNames(KlassHandle k, 877 Symbol* name, Symbol* sig, 878 int mflags, KlassHandle caller, 879 int skip, objArrayHandle results) { 880 // %%% take caller into account! 881 882 Thread* thread = Thread::current(); 883 884 if (k.is_null() || !k->is_instance_klass()) return -1; 885 886 int rfill = 0, rlimit = results->length(), rskip = skip; 887 // overflow measurement: 888 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 889 890 int match_flags = mflags; 891 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 892 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 893 bool local_only = !(search_superc | search_intfc); 894 bool classes_only = false; 895 896 if (name != NULL) { 897 if (name->utf8_length() == 0) return 0; // a match is not possible 898 } 899 if (sig != NULL) { 900 if (sig->utf8_length() == 0) return 0; // a match is not possible 901 if (sig->byte_at(0) == '(') 902 match_flags &= ~(IS_FIELD | IS_TYPE); 903 else 904 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 905 } 906 907 if ((match_flags & IS_TYPE) != 0) { 908 // NYI, and Core Reflection works quite well for this query 909 } 910 911 if ((match_flags & IS_FIELD) != 0) { 912 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 913 if (name != NULL && st.name() != name) 914 continue; 915 if (sig != NULL && st.signature() != sig) 916 continue; 917 // passed the filters 918 if (rskip > 0) { 919 --rskip; 920 } else if (rfill < rlimit) { 921 Handle result(thread, results->obj_at(rfill++)); 922 if (!java_lang_invoke_MemberName::is_instance(result())) 923 return -99; // caller bug! 924 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 925 if (saved != result()) 926 results->obj_at_put(rfill-1, saved); // show saved instance to user 927 } else if (++overflow >= overflow_limit) { 928 match_flags = 0; break; // got tired of looking at overflow 929 } 930 } 931 } 932 933 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 934 // watch out for these guys: 935 Symbol* init_name = vmSymbols::object_initializer_name(); 936 Symbol* clinit_name = vmSymbols::class_initializer_name(); 937 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 938 bool negate_name_test = false; 939 // fix name so that it captures the intention of IS_CONSTRUCTOR 940 if (!(match_flags & IS_METHOD)) { 941 // constructors only 942 if (name == NULL) { 943 name = init_name; 944 } else if (name != init_name) { 945 return 0; // no constructors of this method name 946 } 947 } else if (!(match_flags & IS_CONSTRUCTOR)) { 948 // methods only 949 if (name == NULL) { 950 name = init_name; 951 negate_name_test = true; // if we see the name, we *omit* the entry 952 } else if (name == init_name) { 953 return 0; // no methods of this constructor name 954 } 955 } else { 956 // caller will accept either sort; no need to adjust name 957 } 958 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 959 Method* m = st.method(); 960 Symbol* m_name = m->name(); 961 if (m_name == clinit_name) 962 continue; 963 if (name != NULL && ((m_name != name) ^ negate_name_test)) 964 continue; 965 if (sig != NULL && m->signature() != sig) 966 continue; 967 // passed the filters 968 if (rskip > 0) { 969 --rskip; 970 } else if (rfill < rlimit) { 971 Handle result(thread, results->obj_at(rfill++)); 972 if (!java_lang_invoke_MemberName::is_instance(result())) 973 return -99; // caller bug! 974 CallInfo info(m); 975 // Since this is going through the methods to create MemberNames, don't search 976 // for matching methods already in the table 977 oop saved = MethodHandles::init_method_MemberName(result, info, /*intern*/false); 978 if (saved != result()) 979 results->obj_at_put(rfill-1, saved); // show saved instance to user 980 } else if (++overflow >= overflow_limit) { 981 match_flags = 0; break; // got tired of looking at overflow 982 } 983 } 984 } 985 986 // return number of elements we at leasted wanted to initialize 987 return rfill + overflow; 988 } 989 990 // Is it safe to remove stale entries from a dependency list? 991 static bool safe_to_expunge() { 992 // Since parallel GC threads can concurrently iterate over a dependency 993 // list during safepoint, it is safe to remove entries only when 994 // CodeCache lock is held. 995 return CodeCache_lock->owned_by_self(); 996 } 997 998 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 999 assert_locked_or_safepoint(CodeCache_lock); 1000 1001 oop context = java_lang_invoke_CallSite::context(call_site); 1002 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1003 // Try to purge stale entries on updates. 1004 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 1005 // in order to avoid memory leak, stale entries are purged whenever a dependency list 1006 // is changed (both on addition and removal). Though memory reclamation is delayed, 1007 // it avoids indefinite memory usage growth. 1008 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 1009 } 1010 1011 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 1012 assert_locked_or_safepoint(CodeCache_lock); 1013 1014 oop context = java_lang_invoke_CallSite::context(call_site); 1015 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1016 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 1017 } 1018 1019 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 1020 assert_lock_strong(Compile_lock); 1021 1022 int marked = 0; 1023 CallSiteDepChange changes(call_site(), target()); 1024 { 1025 NoSafepointVerifier nsv; 1026 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1027 1028 oop context = java_lang_invoke_CallSite::context(call_site()); 1029 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1030 marked = deps.mark_dependent_nmethods(changes); 1031 } 1032 if (marked > 0) { 1033 // At least one nmethod has been marked for deoptimization. 1034 VM_Deoptimize op; 1035 VMThread::execute(&op); 1036 } 1037 } 1038 1039 //------------------------------------------------------------------------------ 1040 // MemberNameTable 1041 // 1042 1043 MemberNameTable::MemberNameTable(int methods_cnt) 1044 : GrowableArray<jweak>(methods_cnt, true) { 1045 assert_locked_or_safepoint(MemberNameTable_lock); 1046 } 1047 1048 MemberNameTable::~MemberNameTable() { 1049 assert_locked_or_safepoint(MemberNameTable_lock); 1050 int len = this->length(); 1051 1052 for (int idx = 0; idx < len; idx++) { 1053 jweak ref = this->at(idx); 1054 JNIHandles::destroy_weak_global(ref); 1055 } 1056 } 1057 1058 oop MemberNameTable::add_member_name(jweak mem_name_wref) { 1059 assert_locked_or_safepoint(MemberNameTable_lock); 1060 this->push(mem_name_wref); 1061 return JNIHandles::resolve(mem_name_wref); 1062 } 1063 1064 oop MemberNameTable::find_or_add_member_name(jweak mem_name_wref) { 1065 assert_locked_or_safepoint(MemberNameTable_lock); 1066 oop new_mem_name = JNIHandles::resolve(mem_name_wref); 1067 1068 // Find matching member name in the list. 1069 // This is linear because these because these are short lists. 1070 int len = this->length(); 1071 int new_index = len; 1072 for (int idx = 0; idx < len; idx++) { 1073 oop mname = JNIHandles::resolve(this->at(idx)); 1074 if (mname == NULL) { 1075 new_index = idx; 1076 continue; 1077 } 1078 if (java_lang_invoke_MemberName::equals(new_mem_name, mname)) { 1079 JNIHandles::destroy_weak_global(mem_name_wref); 1080 return mname; 1081 } 1082 } 1083 // Not found, push the new one, or reuse empty slot 1084 this->at_put_grow(new_index, mem_name_wref); 1085 return new_mem_name; 1086 } 1087 1088 #if INCLUDE_JVMTI 1089 // It is called at safepoint only for RedefineClasses 1090 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) { 1091 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 1092 // For each redefined method 1093 for (int idx = 0; idx < length(); idx++) { 1094 oop mem_name = JNIHandles::resolve(this->at(idx)); 1095 if (mem_name == NULL) { 1096 continue; 1097 } 1098 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); 1099 1100 if (old_method == NULL || !old_method->is_old()) { 1101 continue; // skip uninteresting entries 1102 } 1103 if (old_method->is_deleted()) { 1104 // skip entries with deleted methods 1105 continue; 1106 } 1107 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); 1108 1109 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 1110 assert(old_method != new_method, "sanity check"); 1111 1112 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method); 1113 1114 if (log_is_enabled(Info, redefine, class, update)) { 1115 ResourceMark rm; 1116 if (!(*trace_name_printed)) { 1117 log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name()); 1118 *trace_name_printed = true; 1119 } 1120 log_debug(redefine, class, update, constantpool) 1121 ("MemberName method update: %s(%s)", 1122 new_method->name()->as_C_string(), new_method->signature()->as_C_string()); 1123 } 1124 } 1125 } 1126 #endif // INCLUDE_JVMTI 1127 1128 // 1129 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1130 // They are the private interface between this JVM and the HotSpot-specific 1131 // Java code that implements JSR 292 method handles. 1132 // 1133 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1134 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1135 // 1136 1137 #ifndef PRODUCT 1138 #define EACH_NAMED_CON(template, requirement) \ 1139 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1140 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1141 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1142 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1143 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1144 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1145 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1146 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1147 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1148 /*end*/ 1149 1150 #define IGNORE_REQ(req_expr) /* req_expr */ 1151 #define ONE_PLUS(scope,value) 1+ 1152 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1153 #define VALUE_COMMA(scope,value) scope::value, 1154 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1155 #define STRING_NULL(scope,value) #value "\0" 1156 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1157 1158 static bool advertise_con_value(int which) { 1159 if (which < 0) return false; 1160 bool ok = true; 1161 int count = 0; 1162 #define INC_COUNT(scope,value) \ 1163 ++count; 1164 #define CHECK_REQ(req_expr) \ 1165 if (which < count) return ok; \ 1166 ok = (req_expr); 1167 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1168 #undef INC_COUNT 1169 #undef CHECK_REQ 1170 assert(count == con_value_count, ""); 1171 if (which < count) return ok; 1172 return false; 1173 } 1174 1175 #undef ONE_PLUS 1176 #undef VALUE_COMMA 1177 #undef STRING_NULL 1178 #undef EACH_NAMED_CON 1179 #endif // PRODUCT 1180 1181 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1182 #ifndef PRODUCT 1183 if (advertise_con_value(which)) { 1184 assert(which >= 0 && which < con_value_count, ""); 1185 int con = con_values[which]; 1186 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1187 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1188 const char* str = &con_names[0]; 1189 for (int i = 0; i < which; i++) 1190 str += strlen(str) + 1; // skip name and null 1191 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1192 box->obj_at_put(0, name); 1193 } 1194 return con; 1195 } 1196 #endif 1197 return 0; 1198 } 1199 JVM_END 1200 1201 // void init(MemberName self, AccessibleObject ref) 1202 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1203 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1204 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1205 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1206 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1207 MethodHandles::init_MemberName(mname, target); 1208 } 1209 JVM_END 1210 1211 // void expand(MemberName self) 1212 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1213 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1214 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1215 MethodHandles::expand_MemberName(mname, 0, CHECK); 1216 } 1217 JVM_END 1218 1219 // The trusted Java code that calls this method should already have performed 1220 // access checks on behalf of the given caller. But, we can verify this. 1221 static void verify_method_handle(Handle mname, jclass caller_jh, TRAPS) { 1222 if (VerifyMethodHandles && caller_jh != NULL && 1223 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1224 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1225 if (reference_klass != NULL && reference_klass->is_objArray_klass()) { 1226 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1227 } 1228 1229 // Reflection::verify_class_access can only handle instance classes. 1230 if (reference_klass != NULL && reference_klass->is_instance_klass()) { 1231 // Emulate LinkResolver::check_klass_accessability. 1232 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1233 if (Reflection::verify_class_access(caller, 1234 reference_klass, 1235 true) != Reflection::ACCESS_OK) { 1236 THROW_MSG(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1237 } 1238 } 1239 } 1240 } 1241 1242 // void resolve(MemberName self, Class<?> caller) 1243 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1244 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1245 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1246 1247 verify_method_handle(mname, caller_jh, CHECK_NULL); 1248 1249 KlassHandle caller(THREAD, 1250 caller_jh == NULL ? (Klass*) NULL : 1251 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh))); 1252 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, /* !clear_pending */false, CHECK_NULL); 1253 1254 if (resolved.is_null()) { 1255 int flags = java_lang_invoke_MemberName::flags(mname()); 1256 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1257 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1258 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1259 } 1260 if ((flags & ALL_KINDS) == IS_FIELD) { 1261 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed"); 1262 } else if ((flags & ALL_KINDS) == IS_METHOD || 1263 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1264 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed"); 1265 } else { 1266 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1267 } 1268 } 1269 1270 return JNIHandles::make_local(THREAD, resolved()); 1271 } 1272 JVM_END 1273 1274 // void resolveOrNull(MemberName self, Class<?> caller) 1275 JVM_ENTRY(jobject, MHN_resolve_or_null_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1276 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1277 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1278 1279 verify_method_handle(mname, caller_jh, CHECK_NULL); 1280 1281 KlassHandle caller(THREAD, 1282 caller_jh == NULL ? (Klass*) NULL : 1283 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh))); 1284 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, /* clear_pending */true, CHECK_NULL); 1285 1286 return JNIHandles::make_local(THREAD, resolved()); 1287 } 1288 JVM_END 1289 1290 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1291 if (mname == NULL || 1292 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1293 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1294 } else { 1295 int flags = java_lang_invoke_MemberName::flags(mname); 1296 if ((flags & IS_FIELD) != 0 && 1297 (must_be_static 1298 ? (flags & JVM_ACC_STATIC) != 0 1299 : (flags & JVM_ACC_STATIC) == 0)) { 1300 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1301 return (jlong) vmindex; 1302 } 1303 } 1304 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1305 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1306 return 0; 1307 } 1308 1309 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1310 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1311 } 1312 JVM_END 1313 1314 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1315 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1316 } 1317 JVM_END 1318 1319 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1320 // use the other function to perform sanity checks: 1321 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1322 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1323 return JNIHandles::make_local(THREAD, clazz); 1324 } 1325 JVM_END 1326 1327 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1328 if (mname_jh == NULL) return NULL; 1329 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1330 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1331 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1332 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1333 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1334 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1335 result->obj_at_put(0, x); 1336 x = NULL; 1337 if (vmtarget == NULL) { 1338 x = NULL; 1339 } else if (vmtarget->is_klass()) { 1340 x = ((Klass*) vmtarget)->java_mirror(); 1341 } else if (vmtarget->is_method()) { 1342 x = mname(); 1343 } 1344 result->obj_at_put(1, x); 1345 return JNIHandles::make_local(env, result()); 1346 } 1347 JVM_END 1348 1349 1350 1351 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1352 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1353 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1354 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1355 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1356 if (clazz_jh == NULL || results_jh == NULL) return -1; 1357 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); 1358 1359 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1360 if (results.is_null() || !results->is_objArray()) return -1; 1361 1362 TempNewSymbol name = NULL; 1363 TempNewSymbol sig = NULL; 1364 if (name_jh != NULL) { 1365 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1366 if (name == NULL) return 0; // a match is not possible 1367 } 1368 if (sig_jh != NULL) { 1369 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1370 if (sig == NULL) return 0; // a match is not possible 1371 } 1372 1373 KlassHandle caller; 1374 if (caller_jh != NULL) { 1375 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1376 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1377 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); 1378 } 1379 1380 if (name != NULL && sig != NULL && results.not_null()) { 1381 // try a direct resolve 1382 // %%% TO DO 1383 } 1384 1385 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1386 caller, skip, results); 1387 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1388 return res; 1389 } 1390 JVM_END 1391 1392 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1393 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1394 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1395 { 1396 // Walk all nmethods depending on this call site. 1397 MutexLocker mu(Compile_lock, thread); 1398 MethodHandles::flush_dependent_nmethods(call_site, target); 1399 java_lang_invoke_CallSite::set_target(call_site(), target()); 1400 } 1401 } 1402 JVM_END 1403 1404 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1405 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1406 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1407 { 1408 // Walk all nmethods depending on this call site. 1409 MutexLocker mu(Compile_lock, thread); 1410 MethodHandles::flush_dependent_nmethods(call_site, target); 1411 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1412 } 1413 } 1414 JVM_END 1415 1416 // It is called by a Cleaner object which ensures that dropped CallSites properly 1417 // deallocate their dependency information. 1418 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1419 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1420 { 1421 // Walk all nmethods depending on this call site. 1422 MutexLocker mu1(Compile_lock, thread); 1423 1424 int marked = 0; 1425 { 1426 NoSafepointVerifier nsv; 1427 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1428 assert(safe_to_expunge(), "removal is not safe"); 1429 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1430 marked = deps.remove_all_dependents(); 1431 } 1432 if (marked > 0) { 1433 // At least one nmethod has been marked for deoptimization 1434 VM_Deoptimize op; 1435 VMThread::execute(&op); 1436 } 1437 } 1438 } 1439 JVM_END 1440 1441 /** 1442 * Throws a java/lang/UnsupportedOperationException unconditionally. 1443 * This is required by the specification of MethodHandle.invoke if 1444 * invoked directly. 1445 */ 1446 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1447 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1448 return NULL; 1449 } 1450 JVM_END 1451 1452 /** 1453 * Throws a java/lang/UnsupportedOperationException unconditionally. 1454 * This is required by the specification of MethodHandle.invokeExact if 1455 * invoked directly. 1456 */ 1457 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1458 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1459 return NULL; 1460 } 1461 JVM_END 1462 1463 /// JVM_RegisterMethodHandleMethods 1464 1465 #undef CS // Solaris builds complain 1466 1467 #define LANG "Ljava/lang/" 1468 #define JLINV "Ljava/lang/invoke/" 1469 1470 #define OBJ LANG "Object;" 1471 #define CLS LANG "Class;" 1472 #define STRG LANG "String;" 1473 #define CS JLINV "CallSite;" 1474 #define MT JLINV "MethodType;" 1475 #define MH JLINV "MethodHandle;" 1476 #define MEM JLINV "MemberName;" 1477 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1478 1479 #define CC (char*) /*cast a literal from (const char*)*/ 1480 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1481 1482 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1483 static JNINativeMethod MHN_methods[] = { 1484 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1485 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1486 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)}, 1487 {CC "resolveOrNull", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_or_null_Mem)}, 1488 // static native int getNamedCon(int which, Object[] name) 1489 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1490 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1491 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1492 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1493 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1494 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1495 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1496 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1497 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1498 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1499 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1500 }; 1501 1502 static JNINativeMethod MH_methods[] = { 1503 // UnsupportedOperationException throwers 1504 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1505 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1506 }; 1507 1508 /** 1509 * This one function is exported, used by NativeLookup. 1510 */ 1511 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1512 assert(!MethodHandles::enabled(), "must not be enabled"); 1513 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 1514 1515 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1516 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror); 1517 1518 { 1519 ThreadToNativeFromVM ttnfv(thread); 1520 1521 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1522 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1523 "register java.lang.invoke.MethodHandleNative natives"); 1524 1525 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1526 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1527 "register java.lang.invoke.MethodHandle natives"); 1528 } 1529 1530 if (TraceInvokeDynamic) { 1531 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1532 } 1533 1534 MethodHandles::set_enabled(true); 1535 } 1536 JVM_END