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