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 "oops/objArrayOop.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "prims/methodHandles.hpp" 40 #include "prims/jvmtiRedefineClassesTrace.hpp" 41 #include "runtime/compilationPolicy.hpp" 42 #include "runtime/javaCalls.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 /** 68 * Generates method handle adapters. Returns 'false' if memory allocation 69 * failed and true otherwise. 70 */ 71 bool MethodHandles::generate_adapters() { 72 if (SystemDictionary::MethodHandle_klass() == NULL) { 73 return true; 74 } 75 76 assert(_adapter_code == NULL, "generate only once"); 77 78 ResourceMark rm; 79 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); 80 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 81 if (_adapter_code == NULL) { 82 return false; 83 } 84 85 CodeBuffer code(_adapter_code); 86 MethodHandlesAdapterGenerator g(&code); 87 g.generate(); 88 code.log_section_sizes("MethodHandlesAdapterBlob"); 89 return true; 90 } 91 92 //------------------------------------------------------------------------------ 93 // MethodHandlesAdapterGenerator::generate 94 // 95 void MethodHandlesAdapterGenerator::generate() { 96 // Generate generic method handle adapters. 97 // Generate interpreter entries 98 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 99 mk <= Interpreter::method_handle_invoke_LAST; 100 mk = Interpreter::MethodKind(1 + (int)mk)) { 101 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 102 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 103 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 104 if (entry != NULL) { 105 CodeCacheExtensions::handle_generated_pc(entry, vmIntrinsics::name_at(iid)); 106 Interpreter::set_entry_for_kind(mk, entry); 107 } 108 // If the entry is not set, it will throw AbstractMethodError. 109 } 110 } 111 112 void MethodHandles::set_enabled(bool z) { 113 if (_enabled != z) { 114 guarantee(z, "can only enable once"); 115 _enabled = z; 116 } 117 } 118 119 // MemberName support 120 121 // import java_lang_invoke_MemberName.* 122 enum { 123 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 124 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 125 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 126 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 127 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 128 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 129 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 130 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 131 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 132 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 133 }; 134 135 Handle MethodHandles::new_MemberName(TRAPS) { 136 Handle empty; 137 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 138 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 139 return Handle(THREAD, k->allocate_instance(THREAD)); 140 } 141 142 oop MethodHandles::init_MemberName(Handle mname, Handle target) { 143 // This method is used from java.lang.invoke.MemberName constructors. 144 // It fills in the new MemberName from a java.lang.reflect.Member. 145 Thread* thread = Thread::current(); 146 oop target_oop = target(); 147 Klass* target_klass = target_oop->klass(); 148 if (target_klass == SystemDictionary::reflect_Field_klass()) { 149 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 150 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 151 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 152 if (!k.is_null() && k->is_instance_klass()) { 153 fieldDescriptor fd(InstanceKlass::cast(k()), slot); 154 oop mname2 = init_field_MemberName(mname, fd); 155 if (mname2 != NULL) { 156 // Since we have the reified name and type handy, add them to the result. 157 if (java_lang_invoke_MemberName::name(mname2) == NULL) 158 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 159 if (java_lang_invoke_MemberName::type(mname2) == NULL) 160 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 161 } 162 return mname2; 163 } 164 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 165 oop clazz = java_lang_reflect_Method::clazz(target_oop); 166 int slot = java_lang_reflect_Method::slot(target_oop); 167 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 168 if (!k.is_null() && k->is_instance_klass()) { 169 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 170 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 171 return NULL; // do not resolve unless there is a concrete signature 172 CallInfo info(m, k()); 173 return init_method_MemberName(mname, info); 174 } 175 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 176 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 177 int slot = java_lang_reflect_Constructor::slot(target_oop); 178 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 179 if (!k.is_null() && k->is_instance_klass()) { 180 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 181 if (m == NULL) return NULL; 182 CallInfo info(m, k()); 183 return init_method_MemberName(mname, info); 184 } 185 } 186 return NULL; 187 } 188 189 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 190 assert(info.resolved_appendix().is_null(), "only normal methods here"); 191 methodHandle m = info.resolved_method(); 192 assert(m.not_null(), "null method handle"); 193 KlassHandle m_klass = m->method_holder(); 194 assert(m.not_null(), "null holder for method handle"); 195 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 196 int vmindex = Method::invalid_vtable_index; 197 198 switch (info.call_kind()) { 199 case CallInfo::itable_call: 200 vmindex = info.itable_index(); 201 // More importantly, the itable index only works with the method holder. 202 assert(m_klass->verify_itable_index(vmindex), ""); 203 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 204 if (TraceInvokeDynamic) { 205 ResourceMark rm; 206 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 207 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 208 vmindex); 209 m->access_flags().print_on(tty); 210 if (!m->is_abstract()) { 211 tty->print("default"); 212 } 213 tty->cr(); 214 } 215 break; 216 217 case CallInfo::vtable_call: 218 vmindex = info.vtable_index(); 219 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 220 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe"); 221 if (m_klass->is_interface()) { 222 // This is a vtable call to an interface method (abstract "miranda method" or default method). 223 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 224 // (LinkResolver should help us figure this out.) 225 KlassHandle m_klass_non_interface = info.resolved_klass(); 226 if (m_klass_non_interface->is_interface()) { 227 m_klass_non_interface = SystemDictionary::Object_klass(); 228 #ifdef ASSERT 229 { ResourceMark rm; 230 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex); 231 assert(m->name() == m2->name() && m->signature() == m2->signature(), 232 "at %d, %s != %s", vmindex, 233 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 234 } 235 #endif //ASSERT 236 } 237 if (!m->is_public()) { 238 assert(m->is_public(), "virtual call must be to public interface method"); 239 return NULL; // elicit an error later in product build 240 } 241 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe"); 242 m_klass = m_klass_non_interface; 243 } 244 if (TraceInvokeDynamic) { 245 ResourceMark rm; 246 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 247 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 248 m_klass->internal_name(), vmindex); 249 m->access_flags().print_on(tty); 250 if (m->is_default_method()) { 251 tty->print("default"); 252 } 253 tty->cr(); 254 } 255 break; 256 257 case CallInfo::direct_call: 258 vmindex = Method::nonvirtual_vtable_index; 259 if (m->is_static()) { 260 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 261 } else if (m->is_initializer()) { 262 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 263 } else { 264 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 265 } 266 break; 267 268 default: assert(false, "bad CallInfo"); return NULL; 269 } 270 271 // @CallerSensitive annotation detected 272 if (m->caller_sensitive()) { 273 flags |= CALLER_SENSITIVE; 274 } 275 276 oop mname_oop = mname(); 277 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 278 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); 279 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 280 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror()); 281 // Note: name and type can be lazily computed by resolve_MemberName, 282 // if Java code needs them as resolved String and MethodType objects. 283 // The clazz must be eagerly stored, because it provides a GC 284 // root to help keep alive the Method*. 285 // If relevant, the vtable or itable value is stored as vmindex. 286 // This is done eagerly, since it is readily available without 287 // constructing any new objects. 288 // TO DO: maybe intern mname_oop 289 if (m->method_holder()->add_member_name(mname)) { 290 return mname(); 291 } else { 292 // Redefinition caused this to fail. Return NULL (and an exception?) 293 return NULL; 294 } 295 } 296 297 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 298 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 299 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 300 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 301 Metadata* vmtarget = fd.field_holder(); 302 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 303 oop mname_oop = mname(); 304 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 305 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 306 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 307 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); 308 oop type = field_signature_type_or_null(fd.signature()); 309 oop name = field_name_or_null(fd.name()); 310 if (name != NULL) 311 java_lang_invoke_MemberName::set_name(mname_oop, name); 312 if (type != NULL) 313 java_lang_invoke_MemberName::set_type(mname_oop, type); 314 // Note: name and type can be lazily computed by resolve_MemberName, 315 // if Java code needs them as resolved String and Class objects. 316 // Note that the incoming type oop might be pre-resolved (non-null). 317 // The base clazz and field offset (vmindex) must be eagerly stored, 318 // because they unambiguously identify the field. 319 // Although the fieldDescriptor::_index would also identify the field, 320 // we do not use it, because it is harder to decode. 321 // TO DO: maybe intern mname_oop 322 return mname(); 323 } 324 325 // JVM 2.9 Special Methods: 326 // A method is signature polymorphic if and only if all of the following conditions hold : 327 // * It is declared in the java.lang.invoke.MethodHandle class. 328 // * It has a single formal parameter of type Object[]. 329 // * It has a return type of Object. 330 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 331 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 332 if (klass == NULL) 333 return false; 334 // The following test will fail spuriously during bootstrap of MethodHandle itself: 335 // if (klass != SystemDictionary::MethodHandle_klass()) 336 // Test the name instead: 337 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle()) 338 return false; 339 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 340 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig); 341 if (m == NULL) return false; 342 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 343 int flags = m->access_flags().as_int(); 344 return (flags & required) == required; 345 } 346 347 348 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 349 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 350 switch (iid) { 351 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 352 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 353 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 354 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 355 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 356 } 357 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 358 return 0; 359 } 360 361 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 362 switch(id) { 363 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 364 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 365 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 366 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 367 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 368 default: 369 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 370 return Bytecodes::_illegal; 371 } 372 } 373 374 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 375 switch (iid) { 376 case vmIntrinsics::_invokeBasic: return 0; 377 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 378 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 379 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 380 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 381 } 382 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 383 return 0; 384 } 385 386 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 387 vmSymbols::SID name_id = vmSymbols::find_sid(name); 388 switch (name_id) { 389 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 390 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 391 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 392 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 393 394 // There is one static signature-polymorphic method for each JVM invocation mode. 395 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 396 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 397 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 398 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 399 } 400 401 // Cover the case of invokeExact and any future variants of invokeFoo. 402 Klass* mh_klass = SystemDictionary::well_known_klass( 403 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 404 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) 405 return vmIntrinsics::_invokeGeneric; 406 407 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 408 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 409 return vmIntrinsics::_none; 410 } 411 412 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 413 if (klass != NULL && 414 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) { 415 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 416 if (iid != vmIntrinsics::_none) 417 return iid; 418 if (is_method_handle_invoke_name(klass, name)) 419 return vmIntrinsics::_invokeGeneric; 420 } 421 return vmIntrinsics::_none; 422 } 423 424 425 // convert the external string or reflective type to an internal signature 426 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 427 if (java_lang_invoke_MethodType::is_instance(type_str)) { 428 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 429 } else if (java_lang_Class::is_instance(type_str)) { 430 return java_lang_Class::as_signature(type_str, false, THREAD); 431 } else if (java_lang_String::is_instance_inlined(type_str)) { 432 if (intern_if_not_found) { 433 return java_lang_String::as_symbol(type_str, THREAD); 434 } else { 435 return java_lang_String::as_symbol_or_null(type_str); 436 } 437 } else { 438 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 439 } 440 } 441 442 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 443 enum { OBJ_SIG_LEN = 18 }; 444 445 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 446 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 447 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 448 const int len = sig->utf8_length(); 449 for (int i = 0; i < len; i++) { 450 switch (sig->byte_at(i)) { 451 case 'L': 452 // only java/lang/Object is valid here 453 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 454 return false; 455 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 456 continue; 457 case '(': case ')': case 'V': 458 case 'I': case 'J': case 'F': case 'D': 459 continue; 460 //case '[': 461 //case 'Z': case 'B': case 'C': case 'S': 462 default: 463 return false; 464 } 465 } 466 return true; 467 } 468 469 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 470 Symbol* bsig = NULL; 471 if (sig == NULL) { 472 return sig; 473 } else if (is_basic_type_signature(sig)) { 474 sig->increment_refcount(); 475 return sig; // that was easy 476 } else if (sig->byte_at(0) != '(') { 477 BasicType bt = char2type(sig->byte_at(0)); 478 if (is_subword_type(bt)) { 479 bsig = vmSymbols::int_signature(); 480 } else { 481 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 482 bsig = vmSymbols::object_signature(); 483 } 484 } else { 485 ResourceMark rm; 486 stringStream buffer(128); 487 buffer.put('('); 488 int arg_pos = 0, keep_arg_pos = -1; 489 if (keep_last_arg) 490 keep_arg_pos = ArgumentCount(sig).size() - 1; 491 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 492 BasicType bt = ss.type(); 493 size_t this_arg_pos = buffer.size(); 494 if (ss.at_return_type()) { 495 buffer.put(')'); 496 } 497 if (arg_pos == keep_arg_pos) { 498 buffer.write((char*) ss.raw_bytes(), 499 (int) ss.raw_length()); 500 } else if (bt == T_OBJECT || bt == T_ARRAY) { 501 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 502 } else { 503 if (is_subword_type(bt)) 504 bt = T_INT; 505 buffer.put(type2char(bt)); 506 } 507 arg_pos++; 508 } 509 const char* sigstr = buffer.base(); 510 int siglen = (int) buffer.size(); 511 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 512 } 513 assert(is_basic_type_signature(bsig) || 514 // detune assert in case the injected argument is not a basic type: 515 keep_last_arg, ""); 516 return bsig; 517 } 518 519 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 520 Symbol* sig, 521 bool keep_arrays, 522 bool keep_basic_names) { 523 st = st ? st : tty; 524 int len = sig->utf8_length(); 525 int array = 0; 526 bool prev_type = false; 527 for (int i = 0; i < len; i++) { 528 char ch = sig->byte_at(i); 529 switch (ch) { 530 case '(': case ')': 531 prev_type = false; 532 st->put(ch); 533 continue; 534 case '[': 535 if (!keep_basic_names && keep_arrays) 536 st->put(ch); 537 array++; 538 continue; 539 case 'L': 540 { 541 if (prev_type) st->put(','); 542 int start = i+1, slash = start; 543 while (++i < len && (ch = sig->byte_at(i)) != ';') { 544 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 545 } 546 if (slash < i) start = slash; 547 if (!keep_basic_names) { 548 st->put('L'); 549 } else { 550 for (int j = start; j < i; j++) 551 st->put(sig->byte_at(j)); 552 prev_type = true; 553 } 554 break; 555 } 556 default: 557 { 558 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 559 ch = '['; 560 array = 0; 561 } 562 if (prev_type) st->put(','); 563 const char* n = NULL; 564 if (keep_basic_names) 565 n = type2name(char2type(ch)); 566 if (n == NULL) { 567 // unknown letter, or we don't want to know its name 568 st->put(ch); 569 } else { 570 st->print("%s", n); 571 prev_type = true; 572 } 573 break; 574 } 575 } 576 // Switch break goes here to take care of array suffix: 577 if (prev_type) { 578 while (array > 0) { 579 st->print("[]"); 580 --array; 581 } 582 } 583 array = 0; 584 } 585 } 586 587 588 589 static oop object_java_mirror() { 590 return SystemDictionary::Object_klass()->java_mirror(); 591 } 592 593 oop MethodHandles::field_name_or_null(Symbol* s) { 594 if (s == NULL) return NULL; 595 return StringTable::lookup(s); 596 } 597 598 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 599 if (s == NULL) return NULL; 600 BasicType bt = FieldType::basic_type(s); 601 if (is_java_primitive(bt)) { 602 assert(s->utf8_length() == 1, ""); 603 return java_lang_Class::primitive_mirror(bt); 604 } 605 // Here are some more short cuts for common types. 606 // They are optional, since reference types can be resolved lazily. 607 if (bt == T_OBJECT) { 608 if (s == vmSymbols::object_signature()) { 609 return object_java_mirror(); 610 } else if (s == vmSymbols::class_signature()) { 611 return SystemDictionary::Class_klass()->java_mirror(); 612 } else if (s == vmSymbols::string_signature()) { 613 return SystemDictionary::String_klass()->java_mirror(); 614 } 615 } 616 return NULL; 617 } 618 619 620 // An unresolved member name is a mere symbolic reference. 621 // Resolving it plants a vmtarget/vmindex in it, 622 // which refers directly to JVM internals. 623 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) { 624 Handle empty; 625 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 626 627 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 628 // Already resolved. 629 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 630 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 631 return mname; 632 } 633 634 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 635 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 636 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 637 int flags = java_lang_invoke_MemberName::flags(mname()); 638 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 639 if (!ref_kind_is_valid(ref_kind)) { 640 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 641 } 642 643 DEBUG_ONLY(int old_vmindex); 644 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 645 646 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 647 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 648 } 649 650 instanceKlassHandle defc; 651 { 652 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 653 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 654 if (!defc_klass->is_instance_klass()) { 655 if (!defc_klass->is_array_klass()) return empty; 656 defc_klass = SystemDictionary::Object_klass(); 657 } 658 defc = instanceKlassHandle(THREAD, defc_klass); 659 } 660 if (defc.is_null()) { 661 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 662 } 663 defc->link_class(CHECK_(empty)); // possible safepoint 664 665 // convert the external string name to an internal symbol 666 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 667 if (name == NULL) return empty; // no such name 668 if (name == vmSymbols::class_initializer_name()) 669 return empty; // illegal name 670 671 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 672 if ((flags & ALL_KINDS) == IS_METHOD && 673 (defc() == SystemDictionary::MethodHandle_klass()) && 674 (ref_kind == JVM_REF_invokeVirtual || 675 ref_kind == JVM_REF_invokeSpecial || 676 // static invocation mode is required for _linkToVirtual, etc.: 677 ref_kind == JVM_REF_invokeStatic)) { 678 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 679 if (iid != vmIntrinsics::_none && 680 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 681 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 682 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 683 mh_invoke_id = iid; 684 } 685 } 686 687 // convert the external string or reflective type to an internal signature 688 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 689 if (type == NULL) return empty; // no such signature exists in the VM 690 691 // Time to do the lookup. 692 switch (flags & ALL_KINDS) { 693 case IS_METHOD: 694 { 695 CallInfo result; 696 LinkInfo link_info(defc, name, type, caller); 697 { 698 assert(!HAS_PENDING_EXCEPTION, ""); 699 if (ref_kind == JVM_REF_invokeStatic) { 700 LinkResolver::resolve_static_call(result, 701 link_info, false, THREAD); 702 } else if (ref_kind == JVM_REF_invokeInterface) { 703 LinkResolver::resolve_interface_call(result, Handle(), defc, 704 link_info, false, THREAD); 705 } else if (mh_invoke_id != vmIntrinsics::_none) { 706 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 707 LinkResolver::resolve_handle_call(result, link_info, THREAD); 708 } else if (ref_kind == JVM_REF_invokeSpecial) { 709 LinkResolver::resolve_special_call(result, 710 link_info, THREAD); 711 } else if (ref_kind == JVM_REF_invokeVirtual) { 712 LinkResolver::resolve_virtual_call(result, Handle(), defc, 713 link_info, false, THREAD); 714 } else { 715 assert(false, "ref_kind=%d", ref_kind); 716 } 717 if (HAS_PENDING_EXCEPTION) { 718 return empty; 719 } 720 } 721 if (result.resolved_appendix().not_null()) { 722 // The resolved MemberName must not be accompanied by an appendix argument, 723 // since there is no way to bind this value into the MemberName. 724 // Caller is responsible to prevent this from happening. 725 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 726 } 727 oop mname2 = init_method_MemberName(mname, result); 728 return Handle(THREAD, mname2); 729 } 730 case IS_CONSTRUCTOR: 731 { 732 CallInfo result; 733 LinkInfo link_info(defc, name, type, caller); 734 { 735 assert(!HAS_PENDING_EXCEPTION, ""); 736 if (name == vmSymbols::object_initializer_name()) { 737 LinkResolver::resolve_special_call(result, link_info, THREAD); 738 } else { 739 break; // will throw after end of switch 740 } 741 if (HAS_PENDING_EXCEPTION) { 742 return empty; 743 } 744 } 745 assert(result.is_statically_bound(), ""); 746 oop mname2 = init_method_MemberName(mname, result); 747 return Handle(THREAD, mname2); 748 } 749 case IS_FIELD: 750 { 751 fieldDescriptor result; // find_field initializes fd if found 752 { 753 assert(!HAS_PENDING_EXCEPTION, ""); 754 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check); 755 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 756 if (HAS_PENDING_EXCEPTION) { 757 return empty; 758 } 759 } 760 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 761 return Handle(THREAD, mname2); 762 } 763 default: 764 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 765 } 766 767 return empty; 768 } 769 770 // Conversely, a member name which is only initialized from JVM internals 771 // may have null defc, name, and type fields. 772 // Resolving it plants a vmtarget/vmindex in it, 773 // which refers directly to JVM internals. 774 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 775 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 776 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 777 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 778 if (vmtarget == NULL) { 779 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 780 } 781 782 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 783 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 784 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 785 int flags = java_lang_invoke_MemberName::flags(mname()); 786 787 if (suppress != 0) { 788 if (suppress & _suppress_defc) have_defc = true; 789 if (suppress & _suppress_name) have_name = true; 790 if (suppress & _suppress_type) have_type = true; 791 } 792 793 if (have_defc && have_name && have_type) return; // nothing needed 794 795 switch (flags & ALL_KINDS) { 796 case IS_METHOD: 797 case IS_CONSTRUCTOR: 798 { 799 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 800 methodHandle m(THREAD, (Method*)vmtarget); 801 DEBUG_ONLY(vmtarget = NULL); // safety 802 if (m.is_null()) break; 803 if (!have_defc) { 804 InstanceKlass* defc = m->method_holder(); 805 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 806 } 807 if (!have_name) { 808 //not java_lang_String::create_from_symbol; let's intern member names 809 Handle name = StringTable::intern(m->name(), CHECK); 810 java_lang_invoke_MemberName::set_name(mname(), name()); 811 } 812 if (!have_type) { 813 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 814 java_lang_invoke_MemberName::set_type(mname(), type()); 815 } 816 return; 817 } 818 case IS_FIELD: 819 { 820 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 821 if (!((Klass*) vmtarget)->is_instance_klass()) break; 822 instanceKlassHandle defc(THREAD, (Klass*) vmtarget); 823 DEBUG_ONLY(vmtarget = NULL); // safety 824 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 825 fieldDescriptor fd; // find_field initializes fd if found 826 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 827 break; // cannot expand 828 if (!have_defc) { 829 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 830 } 831 if (!have_name) { 832 //not java_lang_String::create_from_symbol; let's intern member names 833 Handle name = StringTable::intern(fd.name(), CHECK); 834 java_lang_invoke_MemberName::set_name(mname(), name()); 835 } 836 if (!have_type) { 837 // If it is a primitive field type, don't mess with short strings like "I". 838 Handle type = field_signature_type_or_null(fd.signature()); 839 if (type.is_null()) { 840 java_lang_String::create_from_symbol(fd.signature(), CHECK); 841 } 842 java_lang_invoke_MemberName::set_type(mname(), type()); 843 } 844 return; 845 } 846 } 847 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 848 } 849 850 int MethodHandles::find_MemberNames(KlassHandle k, 851 Symbol* name, Symbol* sig, 852 int mflags, KlassHandle caller, 853 int skip, objArrayHandle results) { 854 // %%% take caller into account! 855 856 Thread* thread = Thread::current(); 857 858 if (k.is_null() || !k->is_instance_klass()) return -1; 859 860 int rfill = 0, rlimit = results->length(), rskip = skip; 861 // overflow measurement: 862 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 863 864 int match_flags = mflags; 865 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 866 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 867 bool local_only = !(search_superc | search_intfc); 868 bool classes_only = false; 869 870 if (name != NULL) { 871 if (name->utf8_length() == 0) return 0; // a match is not possible 872 } 873 if (sig != NULL) { 874 if (sig->utf8_length() == 0) return 0; // a match is not possible 875 if (sig->byte_at(0) == '(') 876 match_flags &= ~(IS_FIELD | IS_TYPE); 877 else 878 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 879 } 880 881 if ((match_flags & IS_TYPE) != 0) { 882 // NYI, and Core Reflection works quite well for this query 883 } 884 885 if ((match_flags & IS_FIELD) != 0) { 886 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 887 if (name != NULL && st.name() != name) 888 continue; 889 if (sig != NULL && st.signature() != sig) 890 continue; 891 // passed the filters 892 if (rskip > 0) { 893 --rskip; 894 } else if (rfill < rlimit) { 895 Handle result(thread, results->obj_at(rfill++)); 896 if (!java_lang_invoke_MemberName::is_instance(result())) 897 return -99; // caller bug! 898 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 899 if (saved != result()) 900 results->obj_at_put(rfill-1, saved); // show saved instance to user 901 } else if (++overflow >= overflow_limit) { 902 match_flags = 0; break; // got tired of looking at overflow 903 } 904 } 905 } 906 907 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 908 // watch out for these guys: 909 Symbol* init_name = vmSymbols::object_initializer_name(); 910 Symbol* clinit_name = vmSymbols::class_initializer_name(); 911 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 912 bool negate_name_test = false; 913 // fix name so that it captures the intention of IS_CONSTRUCTOR 914 if (!(match_flags & IS_METHOD)) { 915 // constructors only 916 if (name == NULL) { 917 name = init_name; 918 } else if (name != init_name) { 919 return 0; // no constructors of this method name 920 } 921 } else if (!(match_flags & IS_CONSTRUCTOR)) { 922 // methods only 923 if (name == NULL) { 924 name = init_name; 925 negate_name_test = true; // if we see the name, we *omit* the entry 926 } else if (name == init_name) { 927 return 0; // no methods of this constructor name 928 } 929 } else { 930 // caller will accept either sort; no need to adjust name 931 } 932 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 933 Method* m = st.method(); 934 Symbol* m_name = m->name(); 935 if (m_name == clinit_name) 936 continue; 937 if (name != NULL && ((m_name != name) ^ negate_name_test)) 938 continue; 939 if (sig != NULL && m->signature() != sig) 940 continue; 941 // passed the filters 942 if (rskip > 0) { 943 --rskip; 944 } else if (rfill < rlimit) { 945 Handle result(thread, results->obj_at(rfill++)); 946 if (!java_lang_invoke_MemberName::is_instance(result())) 947 return -99; // caller bug! 948 CallInfo info(m); 949 oop saved = MethodHandles::init_method_MemberName(result, info); 950 if (saved != result()) 951 results->obj_at_put(rfill-1, saved); // show saved instance to user 952 } else if (++overflow >= overflow_limit) { 953 match_flags = 0; break; // got tired of looking at overflow 954 } 955 } 956 } 957 958 // return number of elements we at leasted wanted to initialize 959 return rfill + overflow; 960 } 961 962 // Is it safe to remove stale entries from a dependency list? 963 static bool safe_to_expunge() { 964 // Since parallel GC threads can concurrently iterate over a dependency 965 // list during safepoint, it is safe to remove entries only when 966 // CodeCache lock is held. 967 return CodeCache_lock->owned_by_self(); 968 } 969 970 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 971 assert_locked_or_safepoint(CodeCache_lock); 972 973 oop context = java_lang_invoke_CallSite::context(call_site); 974 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 975 // Try to purge stale entries on updates. 976 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 977 // in order to avoid memory leak, stale entries are purged whenever a dependency list 978 // is changed (both on addition and removal). Though memory reclamation is delayed, 979 // it avoids indefinite memory usage growth. 980 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 981 } 982 983 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 984 assert_locked_or_safepoint(CodeCache_lock); 985 986 oop context = java_lang_invoke_CallSite::context(call_site); 987 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 988 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 989 } 990 991 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 992 assert_lock_strong(Compile_lock); 993 994 int marked = 0; 995 CallSiteDepChange changes(call_site(), target()); 996 { 997 NoSafepointVerifier nsv; 998 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 999 1000 oop context = java_lang_invoke_CallSite::context(call_site()); 1001 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1002 marked = deps.mark_dependent_nmethods(changes); 1003 } 1004 if (marked > 0) { 1005 // At least one nmethod has been marked for deoptimization. 1006 VM_Deoptimize op; 1007 VMThread::execute(&op); 1008 } 1009 } 1010 1011 //------------------------------------------------------------------------------ 1012 // MemberNameTable 1013 // 1014 1015 MemberNameTable::MemberNameTable(int methods_cnt) 1016 : GrowableArray<jweak>(methods_cnt, true) { 1017 assert_locked_or_safepoint(MemberNameTable_lock); 1018 } 1019 1020 MemberNameTable::~MemberNameTable() { 1021 assert_locked_or_safepoint(MemberNameTable_lock); 1022 int len = this->length(); 1023 1024 for (int idx = 0; idx < len; idx++) { 1025 jweak ref = this->at(idx); 1026 JNIHandles::destroy_weak_global(ref); 1027 } 1028 } 1029 1030 void MemberNameTable::add_member_name(jweak mem_name_wref) { 1031 assert_locked_or_safepoint(MemberNameTable_lock); 1032 this->push(mem_name_wref); 1033 } 1034 1035 #if INCLUDE_JVMTI 1036 // It is called at safepoint only for RedefineClasses 1037 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) { 1038 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 1039 // For each redefined method 1040 for (int idx = 0; idx < length(); idx++) { 1041 oop mem_name = JNIHandles::resolve(this->at(idx)); 1042 if (mem_name == NULL) { 1043 continue; 1044 } 1045 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); 1046 1047 if (old_method == NULL || !old_method->is_old()) { 1048 continue; // skip uninteresting entries 1049 } 1050 if (old_method->is_deleted()) { 1051 // skip entries with deleted methods 1052 continue; 1053 } 1054 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); 1055 1056 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 1057 assert(old_method != new_method, "sanity check"); 1058 1059 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method); 1060 1061 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 1062 if (!(*trace_name_printed)) { 1063 // RC_TRACE_MESG macro has an embedded ResourceMark 1064 RC_TRACE_MESG(("adjust: name=%s", 1065 old_method->method_holder()->external_name())); 1066 *trace_name_printed = true; 1067 } 1068 // RC_TRACE macro has an embedded ResourceMark 1069 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)", 1070 new_method->name()->as_C_string(), 1071 new_method->signature()->as_C_string())); 1072 } 1073 } 1074 } 1075 #endif // INCLUDE_JVMTI 1076 1077 // 1078 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1079 // They are the private interface between this JVM and the HotSpot-specific 1080 // Java code that implements JSR 292 method handles. 1081 // 1082 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1083 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1084 // 1085 1086 #ifndef PRODUCT 1087 #define EACH_NAMED_CON(template, requirement) \ 1088 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1089 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1090 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1091 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1092 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1093 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1094 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1095 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1096 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1097 /*end*/ 1098 1099 #define IGNORE_REQ(req_expr) /* req_expr */ 1100 #define ONE_PLUS(scope,value) 1+ 1101 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1102 #define VALUE_COMMA(scope,value) scope::value, 1103 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1104 #define STRING_NULL(scope,value) #value "\0" 1105 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1106 1107 static bool advertise_con_value(int which) { 1108 if (which < 0) return false; 1109 bool ok = true; 1110 int count = 0; 1111 #define INC_COUNT(scope,value) \ 1112 ++count; 1113 #define CHECK_REQ(req_expr) \ 1114 if (which < count) return ok; \ 1115 ok = (req_expr); 1116 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1117 #undef INC_COUNT 1118 #undef CHECK_REQ 1119 assert(count == con_value_count, ""); 1120 if (which < count) return ok; 1121 return false; 1122 } 1123 1124 #undef ONE_PLUS 1125 #undef VALUE_COMMA 1126 #undef STRING_NULL 1127 #undef EACH_NAMED_CON 1128 #endif // PRODUCT 1129 1130 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1131 #ifndef PRODUCT 1132 if (advertise_con_value(which)) { 1133 assert(which >= 0 && which < con_value_count, ""); 1134 int con = con_values[which]; 1135 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1136 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1137 const char* str = &con_names[0]; 1138 for (int i = 0; i < which; i++) 1139 str += strlen(str) + 1; // skip name and null 1140 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1141 box->obj_at_put(0, name); 1142 } 1143 return con; 1144 } 1145 #endif 1146 return 0; 1147 } 1148 JVM_END 1149 1150 // void init(MemberName self, AccessibleObject ref) 1151 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1152 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1153 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1154 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1155 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1156 MethodHandles::init_MemberName(mname, target); 1157 } 1158 JVM_END 1159 1160 // void expand(MemberName self) 1161 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1162 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1163 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1164 MethodHandles::expand_MemberName(mname, 0, CHECK); 1165 } 1166 JVM_END 1167 1168 // void resolve(MemberName self, Class<?> caller) 1169 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1170 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1171 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1172 1173 // The trusted Java code that calls this method should already have performed 1174 // access checks on behalf of the given caller. But, we can verify this. 1175 if (VerifyMethodHandles && caller_jh != NULL && 1176 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1177 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1178 if (reference_klass != NULL && reference_klass->is_objArray_klass()) { 1179 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1180 } 1181 1182 // Reflection::verify_class_access can only handle instance classes. 1183 if (reference_klass != NULL && reference_klass->is_instance_klass()) { 1184 // Emulate LinkResolver::check_klass_accessability. 1185 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1186 if (!Reflection::verify_class_access(caller, 1187 reference_klass, 1188 true)) { 1189 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1190 } 1191 } 1192 } 1193 1194 KlassHandle caller(THREAD, 1195 caller_jh == NULL ? (Klass*) NULL : 1196 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh))); 1197 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1198 1199 if (resolved.is_null()) { 1200 int flags = java_lang_invoke_MemberName::flags(mname()); 1201 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1202 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1203 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1204 } 1205 if ((flags & ALL_KINDS) == IS_FIELD) { 1206 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); 1207 } else if ((flags & ALL_KINDS) == IS_METHOD || 1208 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1209 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); 1210 } else { 1211 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1212 } 1213 } 1214 1215 return JNIHandles::make_local(THREAD, resolved()); 1216 } 1217 JVM_END 1218 1219 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1220 if (mname == NULL || 1221 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1222 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1223 } else { 1224 int flags = java_lang_invoke_MemberName::flags(mname); 1225 if ((flags & IS_FIELD) != 0 && 1226 (must_be_static 1227 ? (flags & JVM_ACC_STATIC) != 0 1228 : (flags & JVM_ACC_STATIC) == 0)) { 1229 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1230 return (jlong) vmindex; 1231 } 1232 } 1233 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1234 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1235 return 0; 1236 } 1237 1238 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1239 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1240 } 1241 JVM_END 1242 1243 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1244 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1245 } 1246 JVM_END 1247 1248 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1249 // use the other function to perform sanity checks: 1250 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1251 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1252 return JNIHandles::make_local(THREAD, clazz); 1253 } 1254 JVM_END 1255 1256 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1257 if (mname_jh == NULL) return NULL; 1258 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1259 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1260 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1261 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1262 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1263 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1264 result->obj_at_put(0, x); 1265 x = NULL; 1266 if (vmtarget == NULL) { 1267 x = NULL; 1268 } else if (vmtarget->is_klass()) { 1269 x = ((Klass*) vmtarget)->java_mirror(); 1270 } else if (vmtarget->is_method()) { 1271 x = mname(); 1272 } 1273 result->obj_at_put(1, x); 1274 return JNIHandles::make_local(env, result()); 1275 } 1276 JVM_END 1277 1278 1279 1280 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1281 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1282 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1283 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1284 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1285 if (clazz_jh == NULL || results_jh == NULL) return -1; 1286 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); 1287 1288 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1289 if (results.is_null() || !results->is_objArray()) return -1; 1290 1291 TempNewSymbol name = NULL; 1292 TempNewSymbol sig = NULL; 1293 if (name_jh != NULL) { 1294 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1295 if (name == NULL) return 0; // a match is not possible 1296 } 1297 if (sig_jh != NULL) { 1298 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1299 if (sig == NULL) return 0; // a match is not possible 1300 } 1301 1302 KlassHandle caller; 1303 if (caller_jh != NULL) { 1304 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1305 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1306 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); 1307 } 1308 1309 if (name != NULL && sig != NULL && results.not_null()) { 1310 // try a direct resolve 1311 // %%% TO DO 1312 } 1313 1314 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1315 caller, skip, results); 1316 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1317 return res; 1318 } 1319 JVM_END 1320 1321 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1322 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1323 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1324 { 1325 // Walk all nmethods depending on this call site. 1326 MutexLocker mu(Compile_lock, thread); 1327 MethodHandles::flush_dependent_nmethods(call_site, target); 1328 java_lang_invoke_CallSite::set_target(call_site(), target()); 1329 } 1330 } 1331 JVM_END 1332 1333 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1334 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1335 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1336 { 1337 // Walk all nmethods depending on this call site. 1338 MutexLocker mu(Compile_lock, thread); 1339 MethodHandles::flush_dependent_nmethods(call_site, target); 1340 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1341 } 1342 } 1343 JVM_END 1344 1345 // It is called by a Cleaner object which ensures that dropped CallSites properly 1346 // deallocate their dependency information. 1347 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1348 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1349 { 1350 // Walk all nmethods depending on this call site. 1351 MutexLocker mu1(Compile_lock, thread); 1352 1353 int marked = 0; 1354 { 1355 NoSafepointVerifier nsv; 1356 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1357 assert(safe_to_expunge(), "removal is not safe"); 1358 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1359 marked = deps.remove_all_dependents(); 1360 } 1361 if (marked > 0) { 1362 // At least one nmethod has been marked for deoptimization 1363 VM_Deoptimize op; 1364 VMThread::execute(&op); 1365 } 1366 } 1367 } 1368 JVM_END 1369 1370 /** 1371 * Throws a java/lang/UnsupportedOperationException unconditionally. 1372 * This is required by the specification of MethodHandle.invoke if 1373 * invoked directly. 1374 */ 1375 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1376 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1377 return NULL; 1378 } 1379 JVM_END 1380 1381 /** 1382 * Throws a java/lang/UnsupportedOperationException unconditionally. 1383 * This is required by the specification of MethodHandle.invokeExact if 1384 * invoked directly. 1385 */ 1386 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1387 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1388 return NULL; 1389 } 1390 JVM_END 1391 1392 /// JVM_RegisterMethodHandleMethods 1393 1394 #undef CS // Solaris builds complain 1395 1396 #define LANG "Ljava/lang/" 1397 #define JLINV "Ljava/lang/invoke/" 1398 1399 #define OBJ LANG "Object;" 1400 #define CLS LANG "Class;" 1401 #define STRG LANG "String;" 1402 #define CS JLINV "CallSite;" 1403 #define MT JLINV "MethodType;" 1404 #define MH JLINV "MethodHandle;" 1405 #define MEM JLINV "MemberName;" 1406 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1407 1408 #define CC (char*) /*cast a literal from (const char*)*/ 1409 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1410 1411 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1412 static JNINativeMethod MHN_methods[] = { 1413 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1414 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1415 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)}, 1416 // static native int getNamedCon(int which, Object[] name) 1417 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1418 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1419 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1420 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1421 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1422 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1423 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1424 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1425 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1426 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1427 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1428 }; 1429 1430 static JNINativeMethod MH_methods[] = { 1431 // UnsupportedOperationException throwers 1432 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1433 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1434 }; 1435 1436 /** 1437 * Helper method to register native methods. 1438 */ 1439 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1440 int status = env->RegisterNatives(clazz, methods, nMethods); 1441 if (status != JNI_OK || env->ExceptionOccurred()) { 1442 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 1443 env->ExceptionClear(); 1444 return false; 1445 } 1446 return true; 1447 } 1448 1449 /** 1450 * This one function is exported, used by NativeLookup. 1451 */ 1452 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1453 assert(!MethodHandles::enabled(), "must not be enabled"); 1454 bool enable_MH = true; 1455 1456 jclass MH_class = NULL; 1457 if (SystemDictionary::MethodHandle_klass() == NULL) { 1458 enable_MH = false; 1459 } else { 1460 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1461 MH_class = (jclass) JNIHandles::make_local(env, mirror); 1462 } 1463 1464 if (enable_MH) { 1465 ThreadToNativeFromVM ttnfv(thread); 1466 1467 if (enable_MH) { 1468 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1469 } 1470 if (enable_MH) { 1471 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1472 } 1473 } 1474 1475 if (TraceInvokeDynamic) { 1476 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1477 } 1478 1479 if (enable_MH) { 1480 if (MethodHandles::generate_adapters() == false) { 1481 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters"); 1482 } 1483 MethodHandles::set_enabled(true); 1484 } 1485 } 1486 JVM_END