1 /* 2 * Copyright (c) 2008, 2017, 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/dependencyContext.hpp" 30 #include "compiler/compileBroker.hpp" 31 #include "interpreter/interpreter.hpp" 32 #include "interpreter/oopMapCache.hpp" 33 #include "interpreter/linkResolver.hpp" 34 #include "memory/allocation.inline.hpp" 35 #include "memory/oopFactory.hpp" 36 #include "memory/resourceArea.hpp" 37 #include "oops/objArrayOop.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "prims/methodHandles.hpp" 40 #include "runtime/compilationPolicy.hpp" 41 #include "runtime/javaCalls.hpp" 42 #include "runtime/timerTrace.hpp" 43 #include "runtime/reflection.hpp" 44 #include "runtime/signature.hpp" 45 #include "runtime/stubRoutines.hpp" 46 #include "utilities/exceptions.hpp" 47 48 49 /* 50 * JSR 292 reference implementation: method handles 51 * The JDK 7 reference implementation represented method handle 52 * combinations as chains. Each link in the chain had a "vmentry" 53 * field which pointed at a bit of assembly code which performed 54 * one transformation before dispatching to the next link in the chain. 55 * 56 * The current reference implementation pushes almost all code generation 57 * responsibility to (trusted) Java code. A method handle contains a 58 * pointer to its "LambdaForm", which embodies all details of the method 59 * handle's behavior. The LambdaForm is a normal Java object, managed 60 * by a runtime coded in Java. 61 */ 62 63 bool MethodHandles::_enabled = false; // set true after successful native linkage 64 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 65 66 /** 67 * Generates method handle adapters. Returns 'false' if memory allocation 68 * failed and true otherwise. 69 */ 70 void MethodHandles::generate_adapters() { 71 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 72 assert(_adapter_code == NULL, "generate only once"); 73 74 ResourceMark rm; 75 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime)); 76 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 77 CodeBuffer code(_adapter_code); 78 MethodHandlesAdapterGenerator g(&code); 79 g.generate(); 80 code.log_section_sizes("MethodHandlesAdapterBlob"); 81 } 82 83 //------------------------------------------------------------------------------ 84 // MethodHandlesAdapterGenerator::generate 85 // 86 void MethodHandlesAdapterGenerator::generate() { 87 // Generate generic method handle adapters. 88 // Generate interpreter entries 89 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 90 mk <= Interpreter::method_handle_invoke_LAST; 91 mk = Interpreter::MethodKind(1 + (int)mk)) { 92 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 93 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 94 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 95 if (entry != NULL) { 96 Interpreter::set_entry_for_kind(mk, entry); 97 } 98 // If the entry is not set, it will throw AbstractMethodError. 99 } 100 } 101 102 void MethodHandles::set_enabled(bool z) { 103 if (_enabled != z) { 104 guarantee(z, "can only enable once"); 105 _enabled = z; 106 } 107 } 108 109 // MemberName support 110 111 // import java_lang_invoke_MemberName.* 112 enum { 113 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 114 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 115 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 116 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 117 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 118 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 119 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 120 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 121 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 122 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 123 }; 124 125 Handle MethodHandles::new_MemberName(TRAPS) { 126 Handle empty; 127 InstanceKlass* k = SystemDictionary::MemberName_klass(); 128 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 129 return Handle(THREAD, k->allocate_instance(THREAD)); 130 } 131 132 oop MethodHandles::init_MemberName(Handle mname, Handle target) { 133 // This method is used from java.lang.invoke.MemberName constructors. 134 // It fills in the new MemberName from a java.lang.reflect.Member. 135 Thread* thread = Thread::current(); 136 oop target_oop = target(); 137 Klass* target_klass = target_oop->klass(); 138 if (target_klass == SystemDictionary::reflect_Field_klass()) { 139 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 140 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 141 Klass* k = java_lang_Class::as_Klass(clazz); 142 if (k != NULL && k->is_instance_klass()) { 143 fieldDescriptor fd(InstanceKlass::cast(k), slot); 144 oop mname2 = init_field_MemberName(mname, fd); 145 if (mname2 != NULL) { 146 // Since we have the reified name and type handy, add them to the result. 147 if (java_lang_invoke_MemberName::name(mname2) == NULL) 148 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 149 if (java_lang_invoke_MemberName::type(mname2) == NULL) 150 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 151 } 152 return mname2; 153 } 154 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 155 oop clazz = java_lang_reflect_Method::clazz(target_oop); 156 int slot = java_lang_reflect_Method::slot(target_oop); 157 Klass* k = java_lang_Class::as_Klass(clazz); 158 if (k != NULL && k->is_instance_klass()) { 159 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 160 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 161 return NULL; // do not resolve unless there is a concrete signature 162 CallInfo info(m, k); 163 return init_method_MemberName(mname, info); 164 } 165 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 166 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 167 int slot = java_lang_reflect_Constructor::slot(target_oop); 168 Klass* k = java_lang_Class::as_Klass(clazz); 169 if (k != NULL && k->is_instance_klass()) { 170 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 171 if (m == NULL) return NULL; 172 CallInfo info(m, k); 173 return init_method_MemberName(mname, info); 174 } 175 } 176 return NULL; 177 } 178 179 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 180 assert(info.resolved_appendix().is_null(), "only normal methods here"); 181 methodHandle m = info.resolved_method(); 182 assert(m.not_null(), "null method handle"); 183 Klass* m_klass = m->method_holder(); 184 assert(m_klass != NULL, "null holder for method handle"); 185 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 186 int vmindex = Method::invalid_vtable_index; 187 188 switch (info.call_kind()) { 189 case CallInfo::itable_call: 190 vmindex = info.itable_index(); 191 // More importantly, the itable index only works with the method holder. 192 assert(m_klass->verify_itable_index(vmindex), ""); 193 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 194 if (TraceInvokeDynamic) { 195 ttyLocker ttyl; 196 ResourceMark rm; 197 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 198 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 199 vmindex); 200 m->access_flags().print_on(tty); 201 if (!m->is_abstract()) { 202 tty->print("default"); 203 } 204 tty->cr(); 205 } 206 break; 207 208 case CallInfo::vtable_call: 209 vmindex = info.vtable_index(); 210 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 211 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe"); 212 if (m_klass->is_interface()) { 213 // This is a vtable call to an interface method (abstract "miranda method" or default method). 214 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 215 // (LinkResolver should help us figure this out.) 216 Klass* m_klass_non_interface = info.resolved_klass(); 217 if (m_klass_non_interface->is_interface()) { 218 m_klass_non_interface = SystemDictionary::Object_klass(); 219 #ifdef ASSERT 220 { ResourceMark rm; 221 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex); 222 assert(m->name() == m2->name() && m->signature() == m2->signature(), 223 "at %d, %s != %s", vmindex, 224 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 225 } 226 #endif //ASSERT 227 } 228 if (!m->is_public()) { 229 assert(m->is_public(), "virtual call must be to public interface method"); 230 return NULL; // elicit an error later in product build 231 } 232 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe"); 233 m_klass = m_klass_non_interface; 234 } 235 if (TraceInvokeDynamic) { 236 ttyLocker ttyl; 237 ResourceMark rm; 238 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 239 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 240 m_klass->internal_name(), vmindex); 241 m->access_flags().print_on(tty); 242 if (m->is_default_method()) { 243 tty->print("default"); 244 } 245 tty->cr(); 246 } 247 break; 248 249 case CallInfo::direct_call: 250 vmindex = Method::nonvirtual_vtable_index; 251 if (m->is_static()) { 252 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 253 } else if (m->is_initializer()) { 254 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 255 } else { 256 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 257 } 258 break; 259 260 default: assert(false, "bad CallInfo"); return NULL; 261 } 262 263 // @CallerSensitive annotation detected 264 if (m->caller_sensitive()) { 265 flags |= CALLER_SENSITIVE; 266 } 267 268 oop mname_oop = mname(); 269 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 270 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); 271 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 272 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror()); 273 // Note: name and type can be lazily computed by resolve_MemberName, 274 // if Java code needs them as resolved String and MethodType objects. 275 // The clazz must be eagerly stored, because it provides a GC 276 // root to help keep alive the Method*. 277 // If relevant, the vtable or itable value is stored as vmindex. 278 // This is done eagerly, since it is readily available without 279 // constructing any new objects. 280 // TO DO: maybe intern mname_oop 281 if (m->method_holder()->add_member_name(mname)) { 282 return mname(); 283 } else { 284 // Redefinition caused this to fail. Return NULL (and an exception?) 285 return NULL; 286 } 287 } 288 289 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 290 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 291 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 292 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 293 Metadata* vmtarget = fd.field_holder(); 294 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 295 oop mname_oop = mname(); 296 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 297 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 298 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 299 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); 300 oop type = field_signature_type_or_null(fd.signature()); 301 oop name = field_name_or_null(fd.name()); 302 if (name != NULL) 303 java_lang_invoke_MemberName::set_name(mname_oop, name); 304 if (type != NULL) 305 java_lang_invoke_MemberName::set_type(mname_oop, type); 306 // Note: name and type can be lazily computed by resolve_MemberName, 307 // if Java code needs them as resolved String and Class objects. 308 // Note that the incoming type oop might be pre-resolved (non-null). 309 // The base clazz and field offset (vmindex) must be eagerly stored, 310 // because they unambiguously identify the field. 311 // Although the fieldDescriptor::_index would also identify the field, 312 // we do not use it, because it is harder to decode. 313 // TO DO: maybe intern mname_oop 314 return mname(); 315 } 316 317 // JVM 2.9 Special Methods: 318 // A method is signature polymorphic if and only if all of the following conditions hold : 319 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes. 320 // * It has a single formal parameter of type Object[]. 321 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. 322 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 323 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 324 if (klass == NULL) 325 return false; 326 // The following test will fail spuriously during bootstrap of MethodHandle itself: 327 // if (klass != SystemDictionary::MethodHandle_klass()) 328 // Test the name instead: 329 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() && 330 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { 331 return false; 332 } 333 334 // Look up signature polymorphic method with polymorphic return type 335 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 336 InstanceKlass* iklass = InstanceKlass::cast(klass); 337 Method* m = iklass->find_method(name, poly_sig); 338 if (m != NULL) { 339 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 340 int flags = m->access_flags().as_int(); 341 if ((flags & required) == required) { 342 return true; 343 } 344 } 345 346 // Look up signature polymorphic method with non-polymorphic (non Object) return type 347 int me; 348 int ms = iklass->find_method_by_name(name, &me); 349 if (ms == -1) return false; 350 for (; ms < me; ms++) { 351 Method* m = iklass->methods()->at(ms); 352 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 353 int flags = m->access_flags().as_int(); 354 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 355 return true; 356 } 357 } 358 return false; 359 } 360 361 362 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 363 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 364 switch (iid) { 365 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 366 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 367 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 368 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 369 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 370 } 371 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 372 return 0; 373 } 374 375 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 376 switch(id) { 377 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 378 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 379 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 380 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 381 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 382 default: 383 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 384 return Bytecodes::_illegal; 385 } 386 } 387 388 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 389 switch (iid) { 390 case vmIntrinsics::_invokeBasic: return 0; 391 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 392 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 393 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 394 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 395 } 396 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 397 return 0; 398 } 399 400 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 401 vmSymbols::SID name_id = vmSymbols::find_sid(name); 402 switch (name_id) { 403 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 404 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 405 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 406 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 407 408 // There is one static signature-polymorphic method for each JVM invocation mode. 409 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 410 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 411 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 412 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 413 } 414 415 // Cover the case of invokeExact and any future variants of invokeFoo. 416 Klass* mh_klass = SystemDictionary::well_known_klass( 417 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 418 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) { 419 return vmIntrinsics::_invokeGeneric; 420 } 421 422 // Cover the case of methods on VarHandle. 423 Klass* vh_klass = SystemDictionary::well_known_klass( 424 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) ); 425 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) { 426 return vmIntrinsics::_invokeGeneric; 427 } 428 429 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 430 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 431 return vmIntrinsics::_none; 432 } 433 434 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 435 if (klass != NULL && 436 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() || 437 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { 438 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 439 if (iid != vmIntrinsics::_none) 440 return iid; 441 if (is_method_handle_invoke_name(klass, name)) 442 return vmIntrinsics::_invokeGeneric; 443 } 444 return vmIntrinsics::_none; 445 } 446 447 448 // convert the external string or reflective type to an internal signature 449 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 450 if (java_lang_invoke_MethodType::is_instance(type_str)) { 451 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 452 } else if (java_lang_Class::is_instance(type_str)) { 453 return java_lang_Class::as_signature(type_str, false, THREAD); 454 } else if (java_lang_String::is_instance_inlined(type_str)) { 455 if (intern_if_not_found) { 456 return java_lang_String::as_symbol(type_str, THREAD); 457 } else { 458 return java_lang_String::as_symbol_or_null(type_str); 459 } 460 } else { 461 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 462 } 463 } 464 465 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 466 enum { OBJ_SIG_LEN = 18 }; 467 468 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 469 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 470 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 471 const int len = sig->utf8_length(); 472 for (int i = 0; i < len; i++) { 473 switch (sig->byte_at(i)) { 474 case 'L': 475 // only java/lang/Object is valid here 476 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 477 return false; 478 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 479 continue; 480 case '(': case ')': case 'V': 481 case 'I': case 'J': case 'F': case 'D': 482 continue; 483 //case '[': 484 //case 'Z': case 'B': case 'C': case 'S': 485 default: 486 return false; 487 } 488 } 489 return true; 490 } 491 492 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 493 Symbol* bsig = NULL; 494 if (sig == NULL) { 495 return sig; 496 } else if (is_basic_type_signature(sig)) { 497 sig->increment_refcount(); 498 return sig; // that was easy 499 } else if (sig->byte_at(0) != '(') { 500 BasicType bt = char2type(sig->byte_at(0)); 501 if (is_subword_type(bt)) { 502 bsig = vmSymbols::int_signature(); 503 } else { 504 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 505 bsig = vmSymbols::object_signature(); 506 } 507 } else { 508 ResourceMark rm; 509 stringStream buffer(128); 510 buffer.put('('); 511 int arg_pos = 0, keep_arg_pos = -1; 512 if (keep_last_arg) 513 keep_arg_pos = ArgumentCount(sig).size() - 1; 514 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 515 BasicType bt = ss.type(); 516 size_t this_arg_pos = buffer.size(); 517 if (ss.at_return_type()) { 518 buffer.put(')'); 519 } 520 if (arg_pos == keep_arg_pos) { 521 buffer.write((char*) ss.raw_bytes(), 522 (int) ss.raw_length()); 523 } else if (bt == T_OBJECT || bt == T_ARRAY) { 524 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 525 } else { 526 if (is_subword_type(bt)) 527 bt = T_INT; 528 buffer.put(type2char(bt)); 529 } 530 arg_pos++; 531 } 532 const char* sigstr = buffer.base(); 533 int siglen = (int) buffer.size(); 534 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 535 } 536 assert(is_basic_type_signature(bsig) || 537 // detune assert in case the injected argument is not a basic type: 538 keep_last_arg, ""); 539 return bsig; 540 } 541 542 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 543 Symbol* sig, 544 bool keep_arrays, 545 bool keep_basic_names) { 546 st = st ? st : tty; 547 int len = sig->utf8_length(); 548 int array = 0; 549 bool prev_type = false; 550 for (int i = 0; i < len; i++) { 551 char ch = sig->byte_at(i); 552 switch (ch) { 553 case '(': case ')': 554 prev_type = false; 555 st->put(ch); 556 continue; 557 case '[': 558 if (!keep_basic_names && keep_arrays) 559 st->put(ch); 560 array++; 561 continue; 562 case 'L': 563 { 564 if (prev_type) st->put(','); 565 int start = i+1, slash = start; 566 while (++i < len && (ch = sig->byte_at(i)) != ';') { 567 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 568 } 569 if (slash < i) start = slash; 570 if (!keep_basic_names) { 571 st->put('L'); 572 } else { 573 for (int j = start; j < i; j++) 574 st->put(sig->byte_at(j)); 575 prev_type = true; 576 } 577 break; 578 } 579 default: 580 { 581 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 582 ch = '['; 583 array = 0; 584 } 585 if (prev_type) st->put(','); 586 const char* n = NULL; 587 if (keep_basic_names) 588 n = type2name(char2type(ch)); 589 if (n == NULL) { 590 // unknown letter, or we don't want to know its name 591 st->put(ch); 592 } else { 593 st->print("%s", n); 594 prev_type = true; 595 } 596 break; 597 } 598 } 599 // Switch break goes here to take care of array suffix: 600 if (prev_type) { 601 while (array > 0) { 602 st->print("[]"); 603 --array; 604 } 605 } 606 array = 0; 607 } 608 } 609 610 611 612 static oop object_java_mirror() { 613 return SystemDictionary::Object_klass()->java_mirror(); 614 } 615 616 oop MethodHandles::field_name_or_null(Symbol* s) { 617 if (s == NULL) return NULL; 618 return StringTable::lookup(s); 619 } 620 621 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 622 if (s == NULL) return NULL; 623 BasicType bt = FieldType::basic_type(s); 624 if (is_java_primitive(bt)) { 625 assert(s->utf8_length() == 1, ""); 626 return java_lang_Class::primitive_mirror(bt); 627 } 628 // Here are some more short cuts for common types. 629 // They are optional, since reference types can be resolved lazily. 630 if (bt == T_OBJECT) { 631 if (s == vmSymbols::object_signature()) { 632 return object_java_mirror(); 633 } else if (s == vmSymbols::class_signature()) { 634 return SystemDictionary::Class_klass()->java_mirror(); 635 } else if (s == vmSymbols::string_signature()) { 636 return SystemDictionary::String_klass()->java_mirror(); 637 } 638 } 639 return NULL; 640 } 641 642 643 // An unresolved member name is a mere symbolic reference. 644 // Resolving it plants a vmtarget/vmindex in it, 645 // which refers directly to JVM internals. 646 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, TRAPS) { 647 Handle empty; 648 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 649 650 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 651 // Already resolved. 652 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 653 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 654 return mname; 655 } 656 657 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 658 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 659 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 660 int flags = java_lang_invoke_MemberName::flags(mname()); 661 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 662 if (!ref_kind_is_valid(ref_kind)) { 663 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 664 } 665 666 DEBUG_ONLY(int old_vmindex); 667 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 668 669 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 670 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 671 } 672 673 InstanceKlass* defc = NULL; 674 { 675 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 676 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 677 if (!defc_klass->is_instance_klass()) { 678 if (!defc_klass->is_array_klass()) return empty; 679 defc_klass = SystemDictionary::Object_klass(); 680 } 681 defc = InstanceKlass::cast(defc_klass); 682 } 683 if (defc == NULL) { 684 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 685 } 686 defc->link_class(CHECK_(empty)); // possible safepoint 687 688 // convert the external string name to an internal symbol 689 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 690 if (name == NULL) return empty; // no such name 691 if (name == vmSymbols::class_initializer_name()) 692 return empty; // illegal name 693 694 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 695 if ((flags & ALL_KINDS) == IS_METHOD && 696 (defc == SystemDictionary::MethodHandle_klass()) && 697 (ref_kind == JVM_REF_invokeVirtual || 698 ref_kind == JVM_REF_invokeSpecial || 699 // static invocation mode is required for _linkToVirtual, etc.: 700 ref_kind == JVM_REF_invokeStatic)) { 701 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 702 if (iid != vmIntrinsics::_none && 703 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 704 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 705 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 706 mh_invoke_id = iid; 707 } 708 } 709 710 // convert the external string or reflective type to an internal signature 711 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 712 if (type == NULL) return empty; // no such signature exists in the VM 713 714 LinkInfo::AccessCheck access_check = caller != NULL ? 715 LinkInfo::needs_access_check : 716 LinkInfo::skip_access_check; 717 718 // Time to do the lookup. 719 switch (flags & ALL_KINDS) { 720 case IS_METHOD: 721 { 722 CallInfo result; 723 LinkInfo link_info(defc, name, type, caller, access_check); 724 { 725 assert(!HAS_PENDING_EXCEPTION, ""); 726 if (ref_kind == JVM_REF_invokeStatic) { 727 LinkResolver::resolve_static_call(result, 728 link_info, false, THREAD); 729 } else if (ref_kind == JVM_REF_invokeInterface) { 730 LinkResolver::resolve_interface_call(result, Handle(), defc, 731 link_info, false, THREAD); 732 } else if (mh_invoke_id != vmIntrinsics::_none) { 733 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 734 LinkResolver::resolve_handle_call(result, link_info, THREAD); 735 } else if (ref_kind == JVM_REF_invokeSpecial) { 736 LinkResolver::resolve_special_call(result, 737 link_info, THREAD); 738 } else if (ref_kind == JVM_REF_invokeVirtual) { 739 LinkResolver::resolve_virtual_call(result, Handle(), defc, 740 link_info, false, THREAD); 741 } else { 742 assert(false, "ref_kind=%d", ref_kind); 743 } 744 if (HAS_PENDING_EXCEPTION) { 745 return empty; 746 } 747 } 748 if (result.resolved_appendix().not_null()) { 749 // The resolved MemberName must not be accompanied by an appendix argument, 750 // since there is no way to bind this value into the MemberName. 751 // Caller is responsible to prevent this from happening. 752 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 753 } 754 oop mname2 = init_method_MemberName(mname, result); 755 return Handle(THREAD, mname2); 756 } 757 case IS_CONSTRUCTOR: 758 { 759 CallInfo result; 760 LinkInfo link_info(defc, name, type, caller, access_check); 761 { 762 assert(!HAS_PENDING_EXCEPTION, ""); 763 if (name == vmSymbols::object_initializer_name()) { 764 LinkResolver::resolve_special_call(result, link_info, THREAD); 765 } else { 766 break; // will throw after end of switch 767 } 768 if (HAS_PENDING_EXCEPTION) { 769 return empty; 770 } 771 } 772 assert(result.is_statically_bound(), ""); 773 oop mname2 = init_method_MemberName(mname, result); 774 return Handle(THREAD, mname2); 775 } 776 case IS_FIELD: 777 { 778 fieldDescriptor result; // find_field initializes fd if found 779 { 780 assert(!HAS_PENDING_EXCEPTION, ""); 781 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check); 782 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 783 if (HAS_PENDING_EXCEPTION) { 784 return empty; 785 } 786 } 787 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 788 return Handle(THREAD, mname2); 789 } 790 default: 791 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 792 } 793 794 return empty; 795 } 796 797 // Conversely, a member name which is only initialized from JVM internals 798 // may have null defc, name, and type fields. 799 // Resolving it plants a vmtarget/vmindex in it, 800 // which refers directly to JVM internals. 801 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 802 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 803 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 804 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 805 if (vmtarget == NULL) { 806 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 807 } 808 809 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 810 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 811 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 812 int flags = java_lang_invoke_MemberName::flags(mname()); 813 814 if (suppress != 0) { 815 if (suppress & _suppress_defc) have_defc = true; 816 if (suppress & _suppress_name) have_name = true; 817 if (suppress & _suppress_type) have_type = true; 818 } 819 820 if (have_defc && have_name && have_type) return; // nothing needed 821 822 switch (flags & ALL_KINDS) { 823 case IS_METHOD: 824 case IS_CONSTRUCTOR: 825 { 826 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 827 methodHandle m(THREAD, (Method*)vmtarget); 828 DEBUG_ONLY(vmtarget = NULL); // safety 829 if (m.is_null()) break; 830 if (!have_defc) { 831 InstanceKlass* defc = m->method_holder(); 832 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 833 } 834 if (!have_name) { 835 //not java_lang_String::create_from_symbol; let's intern member names 836 oop name = StringTable::intern(m->name(), CHECK); 837 java_lang_invoke_MemberName::set_name(mname(), name); 838 } 839 if (!have_type) { 840 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 841 java_lang_invoke_MemberName::set_type(mname(), type()); 842 } 843 return; 844 } 845 case IS_FIELD: 846 { 847 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 848 if (!((Klass*) vmtarget)->is_instance_klass()) break; 849 InstanceKlass* defc = InstanceKlass::cast((Klass*) vmtarget); 850 DEBUG_ONLY(vmtarget = NULL); // safety 851 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 852 fieldDescriptor fd; // find_field initializes fd if found 853 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 854 break; // cannot expand 855 if (!have_defc) { 856 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 857 } 858 if (!have_name) { 859 //not java_lang_String::create_from_symbol; let's intern member names 860 oop name = StringTable::intern(fd.name(), CHECK); 861 java_lang_invoke_MemberName::set_name(mname(), name); 862 } 863 if (!have_type) { 864 // If it is a primitive field type, don't mess with short strings like "I". 865 Handle type (THREAD, field_signature_type_or_null(fd.signature())); 866 if (type.is_null()) { 867 type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 868 } 869 java_lang_invoke_MemberName::set_type(mname(), type()); 870 } 871 return; 872 } 873 } 874 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 875 } 876 877 int MethodHandles::find_MemberNames(Klass* k, 878 Symbol* name, Symbol* sig, 879 int mflags, Klass* caller, 880 int skip, objArrayHandle results) { 881 // %%% take caller into account! 882 883 Thread* thread = Thread::current(); 884 885 if (k == NULL || !k->is_instance_klass()) return -1; 886 887 int rfill = 0, rlimit = results->length(), rskip = skip; 888 // overflow measurement: 889 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 890 891 int match_flags = mflags; 892 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 893 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 894 bool local_only = !(search_superc | search_intfc); 895 bool classes_only = false; 896 897 if (name != NULL) { 898 if (name->utf8_length() == 0) return 0; // a match is not possible 899 } 900 if (sig != NULL) { 901 if (sig->utf8_length() == 0) return 0; // a match is not possible 902 if (sig->byte_at(0) == '(') 903 match_flags &= ~(IS_FIELD | IS_TYPE); 904 else 905 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 906 } 907 908 if ((match_flags & IS_TYPE) != 0) { 909 // NYI, and Core Reflection works quite well for this query 910 } 911 912 if ((match_flags & IS_FIELD) != 0) { 913 InstanceKlass* ik = InstanceKlass::cast(k); 914 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 915 if (name != NULL && st.name() != name) 916 continue; 917 if (sig != NULL && st.signature() != sig) 918 continue; 919 // passed the filters 920 if (rskip > 0) { 921 --rskip; 922 } else if (rfill < rlimit) { 923 Handle result(thread, results->obj_at(rfill++)); 924 if (!java_lang_invoke_MemberName::is_instance(result())) 925 return -99; // caller bug! 926 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 927 if (saved != result()) 928 results->obj_at_put(rfill-1, saved); // show saved instance to user 929 } else if (++overflow >= overflow_limit) { 930 match_flags = 0; break; // got tired of looking at overflow 931 } 932 } 933 } 934 935 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 936 // watch out for these guys: 937 Symbol* init_name = vmSymbols::object_initializer_name(); 938 Symbol* clinit_name = vmSymbols::class_initializer_name(); 939 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 940 bool negate_name_test = false; 941 // fix name so that it captures the intention of IS_CONSTRUCTOR 942 if (!(match_flags & IS_METHOD)) { 943 // constructors only 944 if (name == NULL) { 945 name = init_name; 946 } else if (name != init_name) { 947 return 0; // no constructors of this method name 948 } 949 } else if (!(match_flags & IS_CONSTRUCTOR)) { 950 // methods only 951 if (name == NULL) { 952 name = init_name; 953 negate_name_test = true; // if we see the name, we *omit* the entry 954 } else if (name == init_name) { 955 return 0; // no methods of this constructor name 956 } 957 } else { 958 // caller will accept either sort; no need to adjust name 959 } 960 InstanceKlass* ik = InstanceKlass::cast(k); 961 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 962 Method* m = st.method(); 963 Symbol* m_name = m->name(); 964 if (m_name == clinit_name) 965 continue; 966 if (name != NULL && ((m_name != name) ^ negate_name_test)) 967 continue; 968 if (sig != NULL && m->signature() != sig) 969 continue; 970 // passed the filters 971 if (rskip > 0) { 972 --rskip; 973 } else if (rfill < rlimit) { 974 Handle result(thread, results->obj_at(rfill++)); 975 if (!java_lang_invoke_MemberName::is_instance(result())) 976 return -99; // caller bug! 977 CallInfo info(m); 978 oop saved = MethodHandles::init_method_MemberName(result, info); 979 if (saved != result()) 980 results->obj_at_put(rfill-1, saved); // show saved instance to user 981 } else if (++overflow >= overflow_limit) { 982 match_flags = 0; break; // got tired of looking at overflow 983 } 984 } 985 } 986 987 // return number of elements we at leasted wanted to initialize 988 return rfill + overflow; 989 } 990 991 // Is it safe to remove stale entries from a dependency list? 992 static bool safe_to_expunge() { 993 // Since parallel GC threads can concurrently iterate over a dependency 994 // list during safepoint, it is safe to remove entries only when 995 // CodeCache lock is held. 996 return CodeCache_lock->owned_by_self(); 997 } 998 999 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 1000 assert_locked_or_safepoint(CodeCache_lock); 1001 1002 oop context = java_lang_invoke_CallSite::context(call_site); 1003 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1004 // Try to purge stale entries on updates. 1005 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 1006 // in order to avoid memory leak, stale entries are purged whenever a dependency list 1007 // is changed (both on addition and removal). Though memory reclamation is delayed, 1008 // it avoids indefinite memory usage growth. 1009 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 1010 } 1011 1012 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 1013 assert_locked_or_safepoint(CodeCache_lock); 1014 1015 oop context = java_lang_invoke_CallSite::context(call_site); 1016 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1017 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 1018 } 1019 1020 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 1021 assert_lock_strong(Compile_lock); 1022 1023 int marked = 0; 1024 CallSiteDepChange changes(call_site, target); 1025 { 1026 NoSafepointVerifier nsv; 1027 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1028 1029 oop context = java_lang_invoke_CallSite::context(call_site()); 1030 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1031 marked = deps.mark_dependent_nmethods(changes); 1032 } 1033 if (marked > 0) { 1034 // At least one nmethod has been marked for deoptimization. 1035 VM_Deoptimize op; 1036 VMThread::execute(&op); 1037 } 1038 } 1039 1040 //------------------------------------------------------------------------------ 1041 // MemberNameTable 1042 // 1043 1044 MemberNameTable::MemberNameTable(int methods_cnt) 1045 : GrowableArray<jweak>(methods_cnt, true) { 1046 assert_locked_or_safepoint(MemberNameTable_lock); 1047 } 1048 1049 MemberNameTable::~MemberNameTable() { 1050 assert_locked_or_safepoint(MemberNameTable_lock); 1051 int len = this->length(); 1052 1053 for (int idx = 0; idx < len; idx++) { 1054 jweak ref = this->at(idx); 1055 JNIHandles::destroy_weak_global(ref); 1056 } 1057 } 1058 1059 void MemberNameTable::add_member_name(jweak mem_name_wref) { 1060 assert_locked_or_safepoint(MemberNameTable_lock); 1061 this->push(mem_name_wref); 1062 } 1063 1064 #if INCLUDE_JVMTI 1065 // It is called at safepoint only for RedefineClasses 1066 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) { 1067 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 1068 // For each redefined method 1069 for (int idx = 0; idx < length(); idx++) { 1070 oop mem_name = JNIHandles::resolve(this->at(idx)); 1071 if (mem_name == NULL) { 1072 continue; 1073 } 1074 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); 1075 1076 if (old_method == NULL || !old_method->is_old()) { 1077 continue; // skip uninteresting entries 1078 } 1079 if (old_method->is_deleted()) { 1080 // skip entries with deleted methods 1081 continue; 1082 } 1083 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); 1084 1085 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 1086 assert(old_method != new_method, "sanity check"); 1087 1088 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method); 1089 1090 if (log_is_enabled(Info, redefine, class, update)) { 1091 ResourceMark rm; 1092 if (!(*trace_name_printed)) { 1093 log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name()); 1094 *trace_name_printed = true; 1095 } 1096 log_debug(redefine, class, update, constantpool) 1097 ("MemberName method update: %s(%s)", 1098 new_method->name()->as_C_string(), new_method->signature()->as_C_string()); 1099 } 1100 } 1101 } 1102 #endif // INCLUDE_JVMTI 1103 1104 // 1105 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1106 // They are the private interface between this JVM and the HotSpot-specific 1107 // Java code that implements JSR 292 method handles. 1108 // 1109 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1110 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1111 // 1112 1113 #ifndef PRODUCT 1114 #define EACH_NAMED_CON(template, requirement) \ 1115 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1116 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1117 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1118 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1119 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1120 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1121 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1122 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1123 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1124 /*end*/ 1125 1126 #define IGNORE_REQ(req_expr) /* req_expr */ 1127 #define ONE_PLUS(scope,value) 1+ 1128 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1129 #define VALUE_COMMA(scope,value) scope::value, 1130 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1131 #define STRING_NULL(scope,value) #value "\0" 1132 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1133 1134 static bool advertise_con_value(int which) { 1135 if (which < 0) return false; 1136 bool ok = true; 1137 int count = 0; 1138 #define INC_COUNT(scope,value) \ 1139 ++count; 1140 #define CHECK_REQ(req_expr) \ 1141 if (which < count) return ok; \ 1142 ok = (req_expr); 1143 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1144 #undef INC_COUNT 1145 #undef CHECK_REQ 1146 assert(count == con_value_count, ""); 1147 if (which < count) return ok; 1148 return false; 1149 } 1150 1151 #undef ONE_PLUS 1152 #undef VALUE_COMMA 1153 #undef STRING_NULL 1154 #undef EACH_NAMED_CON 1155 #endif // PRODUCT 1156 1157 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1158 #ifndef PRODUCT 1159 if (advertise_con_value(which)) { 1160 assert(which >= 0 && which < con_value_count, ""); 1161 int con = con_values[which]; 1162 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1163 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1164 const char* str = &con_names[0]; 1165 for (int i = 0; i < which; i++) 1166 str += strlen(str) + 1; // skip name and null 1167 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1168 box->obj_at_put(0, name); 1169 } 1170 return con; 1171 } 1172 #endif 1173 return 0; 1174 } 1175 JVM_END 1176 1177 // void init(MemberName self, AccessibleObject ref) 1178 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1179 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1180 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1181 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1182 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1183 MethodHandles::init_MemberName(mname, target); 1184 } 1185 JVM_END 1186 1187 // void expand(MemberName self) 1188 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1189 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1190 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1191 MethodHandles::expand_MemberName(mname, 0, CHECK); 1192 } 1193 JVM_END 1194 1195 // void resolve(MemberName self, Class<?> caller) 1196 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1197 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1198 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1199 1200 // The trusted Java code that calls this method should already have performed 1201 // access checks on behalf of the given caller. But, we can verify this. 1202 if (VerifyMethodHandles && caller_jh != NULL && 1203 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1204 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1205 if (reference_klass != NULL && reference_klass->is_objArray_klass()) { 1206 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1207 } 1208 1209 // Reflection::verify_class_access can only handle instance classes. 1210 if (reference_klass != NULL && reference_klass->is_instance_klass()) { 1211 // Emulate LinkResolver::check_klass_accessability. 1212 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1213 if (caller != SystemDictionary::Object_klass() 1214 && Reflection::verify_class_access(caller, 1215 InstanceKlass::cast(reference_klass), 1216 true) != Reflection::ACCESS_OK) { 1217 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1218 } 1219 } 1220 } 1221 1222 Klass* caller = caller_jh == NULL ? NULL : 1223 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1224 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1225 1226 if (resolved.is_null()) { 1227 int flags = java_lang_invoke_MemberName::flags(mname()); 1228 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1229 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1230 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1231 } 1232 if ((flags & ALL_KINDS) == IS_FIELD) { 1233 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed"); 1234 } else if ((flags & ALL_KINDS) == IS_METHOD || 1235 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1236 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed"); 1237 } else { 1238 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1239 } 1240 } 1241 1242 return JNIHandles::make_local(THREAD, resolved()); 1243 } 1244 JVM_END 1245 1246 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1247 if (mname == NULL || 1248 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1249 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1250 } else { 1251 int flags = java_lang_invoke_MemberName::flags(mname); 1252 if ((flags & IS_FIELD) != 0 && 1253 (must_be_static 1254 ? (flags & JVM_ACC_STATIC) != 0 1255 : (flags & JVM_ACC_STATIC) == 0)) { 1256 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1257 return (jlong) vmindex; 1258 } 1259 } 1260 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1261 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1262 return 0; 1263 } 1264 1265 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1266 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1267 } 1268 JVM_END 1269 1270 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1271 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1272 } 1273 JVM_END 1274 1275 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1276 // use the other function to perform sanity checks: 1277 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1278 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1279 return JNIHandles::make_local(THREAD, clazz); 1280 } 1281 JVM_END 1282 1283 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1284 if (mname_jh == NULL) return NULL; 1285 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1286 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1287 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1288 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1289 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1290 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1291 result->obj_at_put(0, x); 1292 x = NULL; 1293 if (vmtarget == NULL) { 1294 x = NULL; 1295 } else if (vmtarget->is_klass()) { 1296 x = ((Klass*) vmtarget)->java_mirror(); 1297 } else if (vmtarget->is_method()) { 1298 x = mname(); 1299 } 1300 result->obj_at_put(1, x); 1301 return JNIHandles::make_local(env, result()); 1302 } 1303 JVM_END 1304 1305 1306 1307 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1308 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1309 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1310 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1311 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1312 if (clazz_jh == NULL || results_jh == NULL) return -1; 1313 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)); 1314 1315 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1316 if (results.is_null() || !results->is_objArray()) return -1; 1317 1318 TempNewSymbol name = NULL; 1319 TempNewSymbol sig = NULL; 1320 if (name_jh != NULL) { 1321 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1322 if (name == NULL) return 0; // a match is not possible 1323 } 1324 if (sig_jh != NULL) { 1325 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1326 if (sig == NULL) return 0; // a match is not possible 1327 } 1328 1329 Klass* caller = NULL; 1330 if (caller_jh != NULL) { 1331 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1332 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1333 caller = java_lang_Class::as_Klass(caller_oop); 1334 } 1335 1336 if (name != NULL && sig != NULL && results.not_null()) { 1337 // try a direct resolve 1338 // %%% TO DO 1339 } 1340 1341 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1342 caller, skip, results); 1343 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1344 return res; 1345 } 1346 JVM_END 1347 1348 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1349 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1350 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1351 { 1352 // Walk all nmethods depending on this call site. 1353 MutexLocker mu(Compile_lock, thread); 1354 MethodHandles::flush_dependent_nmethods(call_site, target); 1355 java_lang_invoke_CallSite::set_target(call_site(), target()); 1356 } 1357 } 1358 JVM_END 1359 1360 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1361 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1362 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1363 { 1364 // Walk all nmethods depending on this call site. 1365 MutexLocker mu(Compile_lock, thread); 1366 MethodHandles::flush_dependent_nmethods(call_site, target); 1367 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1368 } 1369 } 1370 JVM_END 1371 1372 // It is called by a Cleaner object which ensures that dropped CallSites properly 1373 // deallocate their dependency information. 1374 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1375 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1376 { 1377 // Walk all nmethods depending on this call site. 1378 MutexLocker mu1(Compile_lock, thread); 1379 1380 int marked = 0; 1381 { 1382 NoSafepointVerifier nsv; 1383 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1384 assert(safe_to_expunge(), "removal is not safe"); 1385 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1386 marked = deps.remove_all_dependents(); 1387 } 1388 if (marked > 0) { 1389 // At least one nmethod has been marked for deoptimization 1390 VM_Deoptimize op; 1391 VMThread::execute(&op); 1392 } 1393 } 1394 } 1395 JVM_END 1396 1397 /** 1398 * Throws a java/lang/UnsupportedOperationException unconditionally. 1399 * This is required by the specification of MethodHandle.invoke if 1400 * invoked directly. 1401 */ 1402 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1403 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1404 return NULL; 1405 } 1406 JVM_END 1407 1408 /** 1409 * Throws a java/lang/UnsupportedOperationException unconditionally. 1410 * This is required by the specification of MethodHandle.invokeExact if 1411 * invoked directly. 1412 */ 1413 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1414 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1415 return NULL; 1416 } 1417 JVM_END 1418 1419 /// JVM_RegisterMethodHandleMethods 1420 1421 #undef CS // Solaris builds complain 1422 1423 #define LANG "Ljava/lang/" 1424 #define JLINV "Ljava/lang/invoke/" 1425 1426 #define OBJ LANG "Object;" 1427 #define CLS LANG "Class;" 1428 #define STRG LANG "String;" 1429 #define CS JLINV "CallSite;" 1430 #define MT JLINV "MethodType;" 1431 #define MH JLINV "MethodHandle;" 1432 #define MEM JLINV "MemberName;" 1433 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1434 1435 #define CC (char*) /*cast a literal from (const char*)*/ 1436 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1437 1438 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1439 static JNINativeMethod MHN_methods[] = { 1440 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1441 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1442 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)}, 1443 // static native int getNamedCon(int which, Object[] name) 1444 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1445 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1446 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1447 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1448 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1449 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1450 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1451 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1452 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1453 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1454 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1455 }; 1456 1457 static JNINativeMethod MH_methods[] = { 1458 // UnsupportedOperationException throwers 1459 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1460 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1461 }; 1462 1463 /** 1464 * This one function is exported, used by NativeLookup. 1465 */ 1466 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1467 assert(!MethodHandles::enabled(), "must not be enabled"); 1468 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 1469 1470 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1471 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror); 1472 1473 { 1474 ThreadToNativeFromVM ttnfv(thread); 1475 1476 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1477 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1478 "register java.lang.invoke.MethodHandleNative natives"); 1479 1480 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1481 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1482 "register java.lang.invoke.MethodHandle natives"); 1483 } 1484 1485 if (TraceInvokeDynamic) { 1486 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1487 } 1488 1489 MethodHandles::set_enabled(true); 1490 } 1491 JVM_END