1 /* 2 * Copyright (c) 2008, 2015, 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 ttyLocker ttyl; 206 ResourceMark rm; 207 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 208 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 209 vmindex); 210 m->access_flags().print_on(tty); 211 if (!m->is_abstract()) { 212 tty->print("default"); 213 } 214 tty->cr(); 215 } 216 break; 217 218 case CallInfo::vtable_call: 219 vmindex = info.vtable_index(); 220 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 221 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe"); 222 if (m_klass->is_interface()) { 223 // This is a vtable call to an interface method (abstract "miranda method" or default method). 224 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 225 // (LinkResolver should help us figure this out.) 226 KlassHandle m_klass_non_interface = info.resolved_klass(); 227 if (m_klass_non_interface->is_interface()) { 228 m_klass_non_interface = SystemDictionary::Object_klass(); 229 #ifdef ASSERT 230 { ResourceMark rm; 231 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex); 232 assert(m->name() == m2->name() && m->signature() == m2->signature(), 233 "at %d, %s != %s", vmindex, 234 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 235 } 236 #endif //ASSERT 237 } 238 if (!m->is_public()) { 239 assert(m->is_public(), "virtual call must be to public interface method"); 240 return NULL; // elicit an error later in product build 241 } 242 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe"); 243 m_klass = m_klass_non_interface; 244 } 245 if (TraceInvokeDynamic) { 246 ttyLocker ttyl; 247 ResourceMark rm; 248 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 249 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 250 m_klass->internal_name(), vmindex); 251 m->access_flags().print_on(tty); 252 if (m->is_default_method()) { 253 tty->print("default"); 254 } 255 tty->cr(); 256 } 257 break; 258 259 case CallInfo::direct_call: 260 vmindex = Method::nonvirtual_vtable_index; 261 if (m->is_static()) { 262 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 263 } else if (m->is_initializer()) { 264 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 265 } else { 266 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 267 } 268 break; 269 270 default: assert(false, "bad CallInfo"); return NULL; 271 } 272 273 // @CallerSensitive annotation detected 274 if (m->caller_sensitive()) { 275 flags |= CALLER_SENSITIVE; 276 } 277 278 oop mname_oop = mname(); 279 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 280 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); 281 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 282 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror()); 283 // Note: name and type can be lazily computed by resolve_MemberName, 284 // if Java code needs them as resolved String and MethodType objects. 285 // The clazz must be eagerly stored, because it provides a GC 286 // root to help keep alive the Method*. 287 // If relevant, the vtable or itable value is stored as vmindex. 288 // This is done eagerly, since it is readily available without 289 // constructing any new objects. 290 // TO DO: maybe intern mname_oop 291 if (m->method_holder()->add_member_name(mname)) { 292 return mname(); 293 } else { 294 // Redefinition caused this to fail. Return NULL (and an exception?) 295 return NULL; 296 } 297 } 298 299 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 300 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 301 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 302 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 303 Metadata* vmtarget = fd.field_holder(); 304 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 305 oop mname_oop = mname(); 306 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 307 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 308 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 309 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); 310 oop type = field_signature_type_or_null(fd.signature()); 311 oop name = field_name_or_null(fd.name()); 312 if (name != NULL) 313 java_lang_invoke_MemberName::set_name(mname_oop, name); 314 if (type != NULL) 315 java_lang_invoke_MemberName::set_type(mname_oop, type); 316 // Note: name and type can be lazily computed by resolve_MemberName, 317 // if Java code needs them as resolved String and Class objects. 318 // Note that the incoming type oop might be pre-resolved (non-null). 319 // The base clazz and field offset (vmindex) must be eagerly stored, 320 // because they unambiguously identify the field. 321 // Although the fieldDescriptor::_index would also identify the field, 322 // we do not use it, because it is harder to decode. 323 // TO DO: maybe intern mname_oop 324 return mname(); 325 } 326 327 // JVM 2.9 Special Methods: 328 // A method is signature polymorphic if and only if all of the following conditions hold : 329 // * It is declared in the java.lang.invoke.MethodHandle class. 330 // * It has a single formal parameter of type Object[]. 331 // * It has a return type of Object. 332 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 333 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 334 if (klass == NULL) 335 return false; 336 // The following test will fail spuriously during bootstrap of MethodHandle itself: 337 // if (klass != SystemDictionary::MethodHandle_klass()) 338 // Test the name instead: 339 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle()) 340 return false; 341 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 342 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig); 343 if (m == NULL) return false; 344 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 345 int flags = m->access_flags().as_int(); 346 return (flags & required) == required; 347 } 348 349 350 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 351 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 352 switch (iid) { 353 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 354 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 355 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 356 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 357 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 358 } 359 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 360 return 0; 361 } 362 363 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 364 switch(id) { 365 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 366 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 367 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 368 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 369 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 370 default: 371 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 372 return Bytecodes::_illegal; 373 } 374 } 375 376 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 377 switch (iid) { 378 case vmIntrinsics::_invokeBasic: return 0; 379 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 380 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 381 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 382 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 383 } 384 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 385 return 0; 386 } 387 388 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 389 vmSymbols::SID name_id = vmSymbols::find_sid(name); 390 switch (name_id) { 391 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 392 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 393 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 394 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 395 396 // There is one static signature-polymorphic method for each JVM invocation mode. 397 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 398 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 399 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 400 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 401 } 402 403 // Cover the case of invokeExact and any future variants of invokeFoo. 404 Klass* mh_klass = SystemDictionary::well_known_klass( 405 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 406 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) 407 return vmIntrinsics::_invokeGeneric; 408 409 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 410 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 411 return vmIntrinsics::_none; 412 } 413 414 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 415 if (klass != NULL && 416 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) { 417 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 418 if (iid != vmIntrinsics::_none) 419 return iid; 420 if (is_method_handle_invoke_name(klass, name)) 421 return vmIntrinsics::_invokeGeneric; 422 } 423 return vmIntrinsics::_none; 424 } 425 426 427 // convert the external string or reflective type to an internal signature 428 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 429 if (java_lang_invoke_MethodType::is_instance(type_str)) { 430 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 431 } else if (java_lang_Class::is_instance(type_str)) { 432 return java_lang_Class::as_signature(type_str, false, THREAD); 433 } else if (java_lang_String::is_instance_inlined(type_str)) { 434 if (intern_if_not_found) { 435 return java_lang_String::as_symbol(type_str, THREAD); 436 } else { 437 return java_lang_String::as_symbol_or_null(type_str); 438 } 439 } else { 440 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 441 } 442 } 443 444 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 445 enum { OBJ_SIG_LEN = 18 }; 446 447 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 448 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 449 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 450 const int len = sig->utf8_length(); 451 for (int i = 0; i < len; i++) { 452 switch (sig->byte_at(i)) { 453 case 'L': 454 // only java/lang/Object is valid here 455 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 456 return false; 457 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 458 continue; 459 case '(': case ')': case 'V': 460 case 'I': case 'J': case 'F': case 'D': 461 continue; 462 //case '[': 463 //case 'Z': case 'B': case 'C': case 'S': 464 default: 465 return false; 466 } 467 } 468 return true; 469 } 470 471 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 472 Symbol* bsig = NULL; 473 if (sig == NULL) { 474 return sig; 475 } else if (is_basic_type_signature(sig)) { 476 sig->increment_refcount(); 477 return sig; // that was easy 478 } else if (sig->byte_at(0) != '(') { 479 BasicType bt = char2type(sig->byte_at(0)); 480 if (is_subword_type(bt)) { 481 bsig = vmSymbols::int_signature(); 482 } else { 483 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 484 bsig = vmSymbols::object_signature(); 485 } 486 } else { 487 ResourceMark rm; 488 stringStream buffer(128); 489 buffer.put('('); 490 int arg_pos = 0, keep_arg_pos = -1; 491 if (keep_last_arg) 492 keep_arg_pos = ArgumentCount(sig).size() - 1; 493 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 494 BasicType bt = ss.type(); 495 size_t this_arg_pos = buffer.size(); 496 if (ss.at_return_type()) { 497 buffer.put(')'); 498 } 499 if (arg_pos == keep_arg_pos) { 500 buffer.write((char*) ss.raw_bytes(), 501 (int) ss.raw_length()); 502 } else if (bt == T_OBJECT || bt == T_ARRAY) { 503 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 504 } else { 505 if (is_subword_type(bt)) 506 bt = T_INT; 507 buffer.put(type2char(bt)); 508 } 509 arg_pos++; 510 } 511 const char* sigstr = buffer.base(); 512 int siglen = (int) buffer.size(); 513 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 514 } 515 assert(is_basic_type_signature(bsig) || 516 // detune assert in case the injected argument is not a basic type: 517 keep_last_arg, ""); 518 return bsig; 519 } 520 521 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 522 Symbol* sig, 523 bool keep_arrays, 524 bool keep_basic_names) { 525 st = st ? st : tty; 526 int len = sig->utf8_length(); 527 int array = 0; 528 bool prev_type = false; 529 for (int i = 0; i < len; i++) { 530 char ch = sig->byte_at(i); 531 switch (ch) { 532 case '(': case ')': 533 prev_type = false; 534 st->put(ch); 535 continue; 536 case '[': 537 if (!keep_basic_names && keep_arrays) 538 st->put(ch); 539 array++; 540 continue; 541 case 'L': 542 { 543 if (prev_type) st->put(','); 544 int start = i+1, slash = start; 545 while (++i < len && (ch = sig->byte_at(i)) != ';') { 546 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 547 } 548 if (slash < i) start = slash; 549 if (!keep_basic_names) { 550 st->put('L'); 551 } else { 552 for (int j = start; j < i; j++) 553 st->put(sig->byte_at(j)); 554 prev_type = true; 555 } 556 break; 557 } 558 default: 559 { 560 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 561 ch = '['; 562 array = 0; 563 } 564 if (prev_type) st->put(','); 565 const char* n = NULL; 566 if (keep_basic_names) 567 n = type2name(char2type(ch)); 568 if (n == NULL) { 569 // unknown letter, or we don't want to know its name 570 st->put(ch); 571 } else { 572 st->print("%s", n); 573 prev_type = true; 574 } 575 break; 576 } 577 } 578 // Switch break goes here to take care of array suffix: 579 if (prev_type) { 580 while (array > 0) { 581 st->print("[]"); 582 --array; 583 } 584 } 585 array = 0; 586 } 587 } 588 589 590 591 static oop object_java_mirror() { 592 return SystemDictionary::Object_klass()->java_mirror(); 593 } 594 595 oop MethodHandles::field_name_or_null(Symbol* s) { 596 if (s == NULL) return NULL; 597 return StringTable::lookup(s); 598 } 599 600 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 601 if (s == NULL) return NULL; 602 BasicType bt = FieldType::basic_type(s); 603 if (is_java_primitive(bt)) { 604 assert(s->utf8_length() == 1, ""); 605 return java_lang_Class::primitive_mirror(bt); 606 } 607 // Here are some more short cuts for common types. 608 // They are optional, since reference types can be resolved lazily. 609 if (bt == T_OBJECT) { 610 if (s == vmSymbols::object_signature()) { 611 return object_java_mirror(); 612 } else if (s == vmSymbols::class_signature()) { 613 return SystemDictionary::Class_klass()->java_mirror(); 614 } else if (s == vmSymbols::string_signature()) { 615 return SystemDictionary::String_klass()->java_mirror(); 616 } 617 } 618 return NULL; 619 } 620 621 622 // An unresolved member name is a mere symbolic reference. 623 // Resolving it plants a vmtarget/vmindex in it, 624 // which refers directly to JVM internals. 625 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) { 626 Handle empty; 627 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 628 629 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 630 // Already resolved. 631 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 632 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 633 return mname; 634 } 635 636 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 637 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 638 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 639 int flags = java_lang_invoke_MemberName::flags(mname()); 640 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 641 if (!ref_kind_is_valid(ref_kind)) { 642 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 643 } 644 645 DEBUG_ONLY(int old_vmindex); 646 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 647 648 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 649 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 650 } 651 652 instanceKlassHandle defc; 653 { 654 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 655 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 656 if (!defc_klass->is_instance_klass()) { 657 if (!defc_klass->is_array_klass()) return empty; 658 defc_klass = SystemDictionary::Object_klass(); 659 } 660 defc = instanceKlassHandle(THREAD, defc_klass); 661 } 662 if (defc.is_null()) { 663 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 664 } 665 defc->link_class(CHECK_(empty)); // possible safepoint 666 667 // convert the external string name to an internal symbol 668 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 669 if (name == NULL) return empty; // no such name 670 if (name == vmSymbols::class_initializer_name()) 671 return empty; // illegal name 672 673 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 674 if ((flags & ALL_KINDS) == IS_METHOD && 675 (defc() == SystemDictionary::MethodHandle_klass()) && 676 (ref_kind == JVM_REF_invokeVirtual || 677 ref_kind == JVM_REF_invokeSpecial || 678 // static invocation mode is required for _linkToVirtual, etc.: 679 ref_kind == JVM_REF_invokeStatic)) { 680 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 681 if (iid != vmIntrinsics::_none && 682 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 683 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 684 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 685 mh_invoke_id = iid; 686 } 687 } 688 689 // convert the external string or reflective type to an internal signature 690 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 691 if (type == NULL) return empty; // no such signature exists in the VM 692 693 // Time to do the lookup. 694 switch (flags & ALL_KINDS) { 695 case IS_METHOD: 696 { 697 CallInfo result; 698 LinkInfo link_info(defc, name, type, caller, caller.not_null()); 699 { 700 assert(!HAS_PENDING_EXCEPTION, ""); 701 if (ref_kind == JVM_REF_invokeStatic) { 702 LinkResolver::resolve_static_call(result, 703 link_info, false, THREAD); 704 } else if (ref_kind == JVM_REF_invokeInterface) { 705 LinkResolver::resolve_interface_call(result, Handle(), defc, 706 link_info, false, THREAD); 707 } else if (mh_invoke_id != vmIntrinsics::_none) { 708 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 709 LinkResolver::resolve_handle_call(result, link_info, THREAD); 710 } else if (ref_kind == JVM_REF_invokeSpecial) { 711 LinkResolver::resolve_special_call(result, 712 link_info, THREAD); 713 } else if (ref_kind == JVM_REF_invokeVirtual) { 714 LinkResolver::resolve_virtual_call(result, Handle(), defc, 715 link_info, false, THREAD); 716 } else { 717 assert(false, "ref_kind=%d", ref_kind); 718 } 719 if (HAS_PENDING_EXCEPTION) { 720 return empty; 721 } 722 } 723 if (result.resolved_appendix().not_null()) { 724 // The resolved MemberName must not be accompanied by an appendix argument, 725 // since there is no way to bind this value into the MemberName. 726 // Caller is responsible to prevent this from happening. 727 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 728 } 729 oop mname2 = init_method_MemberName(mname, result); 730 return Handle(THREAD, mname2); 731 } 732 case IS_CONSTRUCTOR: 733 { 734 CallInfo result; 735 LinkInfo link_info(defc, name, type, caller, caller.not_null()); 736 { 737 assert(!HAS_PENDING_EXCEPTION, ""); 738 if (name == vmSymbols::object_initializer_name()) { 739 LinkResolver::resolve_special_call(result, link_info, THREAD); 740 } else { 741 break; // will throw after end of switch 742 } 743 if (HAS_PENDING_EXCEPTION) { 744 return empty; 745 } 746 } 747 assert(result.is_statically_bound(), ""); 748 oop mname2 = init_method_MemberName(mname, result); 749 return Handle(THREAD, mname2); 750 } 751 case IS_FIELD: 752 { 753 fieldDescriptor result; // find_field initializes fd if found 754 { 755 assert(!HAS_PENDING_EXCEPTION, ""); 756 LinkInfo link_info(defc, name, type, caller, /*check_access*/false); 757 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 758 if (HAS_PENDING_EXCEPTION) { 759 return empty; 760 } 761 } 762 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 763 return Handle(THREAD, mname2); 764 } 765 default: 766 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 767 } 768 769 return empty; 770 } 771 772 // Conversely, a member name which is only initialized from JVM internals 773 // may have null defc, name, and type fields. 774 // Resolving it plants a vmtarget/vmindex in it, 775 // which refers directly to JVM internals. 776 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 777 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 778 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 779 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 780 if (vmtarget == NULL) { 781 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 782 } 783 784 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 785 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 786 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 787 int flags = java_lang_invoke_MemberName::flags(mname()); 788 789 if (suppress != 0) { 790 if (suppress & _suppress_defc) have_defc = true; 791 if (suppress & _suppress_name) have_name = true; 792 if (suppress & _suppress_type) have_type = true; 793 } 794 795 if (have_defc && have_name && have_type) return; // nothing needed 796 797 switch (flags & ALL_KINDS) { 798 case IS_METHOD: 799 case IS_CONSTRUCTOR: 800 { 801 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 802 methodHandle m(THREAD, (Method*)vmtarget); 803 DEBUG_ONLY(vmtarget = NULL); // safety 804 if (m.is_null()) break; 805 if (!have_defc) { 806 InstanceKlass* defc = m->method_holder(); 807 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 808 } 809 if (!have_name) { 810 //not java_lang_String::create_from_symbol; let's intern member names 811 Handle name = StringTable::intern(m->name(), CHECK); 812 java_lang_invoke_MemberName::set_name(mname(), name()); 813 } 814 if (!have_type) { 815 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 816 java_lang_invoke_MemberName::set_type(mname(), type()); 817 } 818 return; 819 } 820 case IS_FIELD: 821 { 822 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 823 if (!((Klass*) vmtarget)->is_instance_klass()) break; 824 instanceKlassHandle defc(THREAD, (Klass*) vmtarget); 825 DEBUG_ONLY(vmtarget = NULL); // safety 826 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 827 fieldDescriptor fd; // find_field initializes fd if found 828 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 829 break; // cannot expand 830 if (!have_defc) { 831 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 832 } 833 if (!have_name) { 834 //not java_lang_String::create_from_symbol; let's intern member names 835 Handle name = StringTable::intern(fd.name(), CHECK); 836 java_lang_invoke_MemberName::set_name(mname(), name()); 837 } 838 if (!have_type) { 839 // If it is a primitive field type, don't mess with short strings like "I". 840 Handle type = field_signature_type_or_null(fd.signature()); 841 if (type.is_null()) { 842 java_lang_String::create_from_symbol(fd.signature(), CHECK); 843 } 844 java_lang_invoke_MemberName::set_type(mname(), type()); 845 } 846 return; 847 } 848 } 849 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 850 } 851 852 int MethodHandles::find_MemberNames(KlassHandle k, 853 Symbol* name, Symbol* sig, 854 int mflags, KlassHandle caller, 855 int skip, objArrayHandle results) { 856 // %%% take caller into account! 857 858 Thread* thread = Thread::current(); 859 860 if (k.is_null() || !k->is_instance_klass()) return -1; 861 862 int rfill = 0, rlimit = results->length(), rskip = skip; 863 // overflow measurement: 864 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 865 866 int match_flags = mflags; 867 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 868 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 869 bool local_only = !(search_superc | search_intfc); 870 bool classes_only = false; 871 872 if (name != NULL) { 873 if (name->utf8_length() == 0) return 0; // a match is not possible 874 } 875 if (sig != NULL) { 876 if (sig->utf8_length() == 0) return 0; // a match is not possible 877 if (sig->byte_at(0) == '(') 878 match_flags &= ~(IS_FIELD | IS_TYPE); 879 else 880 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 881 } 882 883 if ((match_flags & IS_TYPE) != 0) { 884 // NYI, and Core Reflection works quite well for this query 885 } 886 887 if ((match_flags & IS_FIELD) != 0) { 888 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 889 if (name != NULL && st.name() != name) 890 continue; 891 if (sig != NULL && st.signature() != sig) 892 continue; 893 // passed the filters 894 if (rskip > 0) { 895 --rskip; 896 } else if (rfill < rlimit) { 897 Handle result(thread, results->obj_at(rfill++)); 898 if (!java_lang_invoke_MemberName::is_instance(result())) 899 return -99; // caller bug! 900 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 901 if (saved != result()) 902 results->obj_at_put(rfill-1, saved); // show saved instance to user 903 } else if (++overflow >= overflow_limit) { 904 match_flags = 0; break; // got tired of looking at overflow 905 } 906 } 907 } 908 909 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 910 // watch out for these guys: 911 Symbol* init_name = vmSymbols::object_initializer_name(); 912 Symbol* clinit_name = vmSymbols::class_initializer_name(); 913 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 914 bool negate_name_test = false; 915 // fix name so that it captures the intention of IS_CONSTRUCTOR 916 if (!(match_flags & IS_METHOD)) { 917 // constructors only 918 if (name == NULL) { 919 name = init_name; 920 } else if (name != init_name) { 921 return 0; // no constructors of this method name 922 } 923 } else if (!(match_flags & IS_CONSTRUCTOR)) { 924 // methods only 925 if (name == NULL) { 926 name = init_name; 927 negate_name_test = true; // if we see the name, we *omit* the entry 928 } else if (name == init_name) { 929 return 0; // no methods of this constructor name 930 } 931 } else { 932 // caller will accept either sort; no need to adjust name 933 } 934 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 935 Method* m = st.method(); 936 Symbol* m_name = m->name(); 937 if (m_name == clinit_name) 938 continue; 939 if (name != NULL && ((m_name != name) ^ negate_name_test)) 940 continue; 941 if (sig != NULL && m->signature() != sig) 942 continue; 943 // passed the filters 944 if (rskip > 0) { 945 --rskip; 946 } else if (rfill < rlimit) { 947 Handle result(thread, results->obj_at(rfill++)); 948 if (!java_lang_invoke_MemberName::is_instance(result())) 949 return -99; // caller bug! 950 CallInfo info(m); 951 oop saved = MethodHandles::init_method_MemberName(result, info); 952 if (saved != result()) 953 results->obj_at_put(rfill-1, saved); // show saved instance to user 954 } else if (++overflow >= overflow_limit) { 955 match_flags = 0; break; // got tired of looking at overflow 956 } 957 } 958 } 959 960 // return number of elements we at leasted wanted to initialize 961 return rfill + overflow; 962 } 963 964 // Is it safe to remove stale entries from a dependency list? 965 static bool safe_to_expunge() { 966 // Since parallel GC threads can concurrently iterate over a dependency 967 // list during safepoint, it is safe to remove entries only when 968 // CodeCache lock is held. 969 return CodeCache_lock->owned_by_self(); 970 } 971 972 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 973 assert_locked_or_safepoint(CodeCache_lock); 974 975 oop context = java_lang_invoke_CallSite::context(call_site); 976 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 977 // Try to purge stale entries on updates. 978 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 979 // in order to avoid memory leak, stale entries are purged whenever a dependency list 980 // is changed (both on addition and removal). Though memory reclamation is delayed, 981 // it avoids indefinite memory usage growth. 982 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 983 } 984 985 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 986 assert_locked_or_safepoint(CodeCache_lock); 987 988 oop context = java_lang_invoke_CallSite::context(call_site); 989 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 990 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 991 } 992 993 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 994 assert_lock_strong(Compile_lock); 995 996 int marked = 0; 997 CallSiteDepChange changes(call_site(), target()); 998 { 999 NoSafepointVerifier nsv; 1000 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1001 1002 oop context = java_lang_invoke_CallSite::context(call_site()); 1003 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1004 marked = deps.mark_dependent_nmethods(changes); 1005 } 1006 if (marked > 0) { 1007 // At least one nmethod has been marked for deoptimization. 1008 VM_Deoptimize op; 1009 VMThread::execute(&op); 1010 } 1011 } 1012 1013 //------------------------------------------------------------------------------ 1014 // MemberNameTable 1015 // 1016 1017 MemberNameTable::MemberNameTable(int methods_cnt) 1018 : GrowableArray<jweak>(methods_cnt, true) { 1019 assert_locked_or_safepoint(MemberNameTable_lock); 1020 } 1021 1022 MemberNameTable::~MemberNameTable() { 1023 assert_locked_or_safepoint(MemberNameTable_lock); 1024 int len = this->length(); 1025 1026 for (int idx = 0; idx < len; idx++) { 1027 jweak ref = this->at(idx); 1028 JNIHandles::destroy_weak_global(ref); 1029 } 1030 } 1031 1032 void MemberNameTable::add_member_name(jweak mem_name_wref) { 1033 assert_locked_or_safepoint(MemberNameTable_lock); 1034 this->push(mem_name_wref); 1035 } 1036 1037 #if INCLUDE_JVMTI 1038 // It is called at safepoint only for RedefineClasses 1039 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) { 1040 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 1041 // For each redefined method 1042 for (int idx = 0; idx < length(); idx++) { 1043 oop mem_name = JNIHandles::resolve(this->at(idx)); 1044 if (mem_name == NULL) { 1045 continue; 1046 } 1047 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); 1048 1049 if (old_method == NULL || !old_method->is_old()) { 1050 continue; // skip uninteresting entries 1051 } 1052 if (old_method->is_deleted()) { 1053 // skip entries with deleted methods 1054 continue; 1055 } 1056 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); 1057 1058 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 1059 assert(old_method != new_method, "sanity check"); 1060 1061 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method); 1062 1063 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 1064 if (!(*trace_name_printed)) { 1065 // RC_TRACE_MESG macro has an embedded ResourceMark 1066 RC_TRACE_MESG(("adjust: name=%s", 1067 old_method->method_holder()->external_name())); 1068 *trace_name_printed = true; 1069 } 1070 // RC_TRACE macro has an embedded ResourceMark 1071 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)", 1072 new_method->name()->as_C_string(), 1073 new_method->signature()->as_C_string())); 1074 } 1075 } 1076 } 1077 #endif // INCLUDE_JVMTI 1078 1079 // 1080 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1081 // They are the private interface between this JVM and the HotSpot-specific 1082 // Java code that implements JSR 292 method handles. 1083 // 1084 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1085 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1086 // 1087 1088 #ifndef PRODUCT 1089 #define EACH_NAMED_CON(template, requirement) \ 1090 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1091 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1092 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1093 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1094 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1095 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1096 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1097 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1098 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1099 /*end*/ 1100 1101 #define IGNORE_REQ(req_expr) /* req_expr */ 1102 #define ONE_PLUS(scope,value) 1+ 1103 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1104 #define VALUE_COMMA(scope,value) scope::value, 1105 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1106 #define STRING_NULL(scope,value) #value "\0" 1107 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1108 1109 static bool advertise_con_value(int which) { 1110 if (which < 0) return false; 1111 bool ok = true; 1112 int count = 0; 1113 #define INC_COUNT(scope,value) \ 1114 ++count; 1115 #define CHECK_REQ(req_expr) \ 1116 if (which < count) return ok; \ 1117 ok = (req_expr); 1118 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1119 #undef INC_COUNT 1120 #undef CHECK_REQ 1121 assert(count == con_value_count, ""); 1122 if (which < count) return ok; 1123 return false; 1124 } 1125 1126 #undef ONE_PLUS 1127 #undef VALUE_COMMA 1128 #undef STRING_NULL 1129 #undef EACH_NAMED_CON 1130 #endif // PRODUCT 1131 1132 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1133 #ifndef PRODUCT 1134 if (advertise_con_value(which)) { 1135 assert(which >= 0 && which < con_value_count, ""); 1136 int con = con_values[which]; 1137 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1138 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1139 const char* str = &con_names[0]; 1140 for (int i = 0; i < which; i++) 1141 str += strlen(str) + 1; // skip name and null 1142 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1143 box->obj_at_put(0, name); 1144 } 1145 return con; 1146 } 1147 #endif 1148 return 0; 1149 } 1150 JVM_END 1151 1152 // void init(MemberName self, AccessibleObject ref) 1153 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1154 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1155 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1156 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1157 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1158 MethodHandles::init_MemberName(mname, target); 1159 } 1160 JVM_END 1161 1162 // void expand(MemberName self) 1163 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1164 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1165 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1166 MethodHandles::expand_MemberName(mname, 0, CHECK); 1167 } 1168 JVM_END 1169 1170 // void resolve(MemberName self, Class<?> caller) 1171 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1172 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1173 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1174 1175 // The trusted Java code that calls this method should already have performed 1176 // access checks on behalf of the given caller. But, we can verify this. 1177 if (VerifyMethodHandles && caller_jh != NULL && 1178 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1179 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1180 if (reference_klass != NULL && reference_klass->is_objArray_klass()) { 1181 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1182 } 1183 1184 // Reflection::verify_class_access can only handle instance classes. 1185 if (reference_klass != NULL && reference_klass->is_instance_klass()) { 1186 // Emulate LinkResolver::check_klass_accessability. 1187 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1188 if (!Reflection::verify_class_access(caller, 1189 reference_klass, 1190 true)) { 1191 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1192 } 1193 } 1194 } 1195 1196 KlassHandle caller(THREAD, 1197 caller_jh == NULL ? (Klass*) NULL : 1198 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh))); 1199 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1200 1201 if (resolved.is_null()) { 1202 int flags = java_lang_invoke_MemberName::flags(mname()); 1203 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1204 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1205 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1206 } 1207 if ((flags & ALL_KINDS) == IS_FIELD) { 1208 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); 1209 } else if ((flags & ALL_KINDS) == IS_METHOD || 1210 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1211 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); 1212 } else { 1213 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1214 } 1215 } 1216 1217 return JNIHandles::make_local(THREAD, resolved()); 1218 } 1219 JVM_END 1220 1221 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1222 if (mname == NULL || 1223 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1224 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1225 } else { 1226 int flags = java_lang_invoke_MemberName::flags(mname); 1227 if ((flags & IS_FIELD) != 0 && 1228 (must_be_static 1229 ? (flags & JVM_ACC_STATIC) != 0 1230 : (flags & JVM_ACC_STATIC) == 0)) { 1231 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1232 return (jlong) vmindex; 1233 } 1234 } 1235 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1236 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1237 return 0; 1238 } 1239 1240 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1241 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1242 } 1243 JVM_END 1244 1245 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1246 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1247 } 1248 JVM_END 1249 1250 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1251 // use the other function to perform sanity checks: 1252 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1253 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1254 return JNIHandles::make_local(THREAD, clazz); 1255 } 1256 JVM_END 1257 1258 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1259 if (mname_jh == NULL) return NULL; 1260 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1261 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1262 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1263 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1264 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1265 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1266 result->obj_at_put(0, x); 1267 x = NULL; 1268 if (vmtarget == NULL) { 1269 x = NULL; 1270 } else if (vmtarget->is_klass()) { 1271 x = ((Klass*) vmtarget)->java_mirror(); 1272 } else if (vmtarget->is_method()) { 1273 x = mname(); 1274 } 1275 result->obj_at_put(1, x); 1276 return JNIHandles::make_local(env, result()); 1277 } 1278 JVM_END 1279 1280 1281 1282 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1283 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1284 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1285 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1286 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1287 if (clazz_jh == NULL || results_jh == NULL) return -1; 1288 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); 1289 1290 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1291 if (results.is_null() || !results->is_objArray()) return -1; 1292 1293 TempNewSymbol name = NULL; 1294 TempNewSymbol sig = NULL; 1295 if (name_jh != NULL) { 1296 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1297 if (name == NULL) return 0; // a match is not possible 1298 } 1299 if (sig_jh != NULL) { 1300 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1301 if (sig == NULL) return 0; // a match is not possible 1302 } 1303 1304 KlassHandle caller; 1305 if (caller_jh != NULL) { 1306 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1307 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1308 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); 1309 } 1310 1311 if (name != NULL && sig != NULL && results.not_null()) { 1312 // try a direct resolve 1313 // %%% TO DO 1314 } 1315 1316 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1317 caller, skip, results); 1318 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1319 return res; 1320 } 1321 JVM_END 1322 1323 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1324 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1325 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1326 { 1327 // Walk all nmethods depending on this call site. 1328 MutexLocker mu(Compile_lock, thread); 1329 MethodHandles::flush_dependent_nmethods(call_site, target); 1330 java_lang_invoke_CallSite::set_target(call_site(), target()); 1331 } 1332 } 1333 JVM_END 1334 1335 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1336 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1337 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1338 { 1339 // Walk all nmethods depending on this call site. 1340 MutexLocker mu(Compile_lock, thread); 1341 MethodHandles::flush_dependent_nmethods(call_site, target); 1342 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1343 } 1344 } 1345 JVM_END 1346 1347 // It is called by a Cleaner object which ensures that dropped CallSites properly 1348 // deallocate their dependency information. 1349 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1350 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1351 { 1352 // Walk all nmethods depending on this call site. 1353 MutexLocker mu1(Compile_lock, thread); 1354 1355 int marked = 0; 1356 { 1357 NoSafepointVerifier nsv; 1358 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1359 assert(safe_to_expunge(), "removal is not safe"); 1360 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1361 marked = deps.remove_all_dependents(); 1362 } 1363 if (marked > 0) { 1364 // At least one nmethod has been marked for deoptimization 1365 VM_Deoptimize op; 1366 VMThread::execute(&op); 1367 } 1368 } 1369 } 1370 JVM_END 1371 1372 /** 1373 * Throws a java/lang/UnsupportedOperationException unconditionally. 1374 * This is required by the specification of MethodHandle.invoke if 1375 * invoked directly. 1376 */ 1377 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1378 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1379 return NULL; 1380 } 1381 JVM_END 1382 1383 /** 1384 * Throws a java/lang/UnsupportedOperationException unconditionally. 1385 * This is required by the specification of MethodHandle.invokeExact if 1386 * invoked directly. 1387 */ 1388 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1389 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1390 return NULL; 1391 } 1392 JVM_END 1393 1394 /// JVM_RegisterMethodHandleMethods 1395 1396 #undef CS // Solaris builds complain 1397 1398 #define LANG "Ljava/lang/" 1399 #define JLINV "Ljava/lang/invoke/" 1400 1401 #define OBJ LANG "Object;" 1402 #define CLS LANG "Class;" 1403 #define STRG LANG "String;" 1404 #define CS JLINV "CallSite;" 1405 #define MT JLINV "MethodType;" 1406 #define MH JLINV "MethodHandle;" 1407 #define MEM JLINV "MemberName;" 1408 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1409 1410 #define CC (char*) /*cast a literal from (const char*)*/ 1411 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1412 1413 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1414 static JNINativeMethod MHN_methods[] = { 1415 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1416 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1417 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)}, 1418 // static native int getNamedCon(int which, Object[] name) 1419 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1420 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1421 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1422 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1423 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1424 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1425 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1426 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1427 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1428 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1429 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1430 }; 1431 1432 static JNINativeMethod MH_methods[] = { 1433 // UnsupportedOperationException throwers 1434 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1435 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1436 }; 1437 1438 /** 1439 * Helper method to register native methods. 1440 */ 1441 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1442 int status = env->RegisterNatives(clazz, methods, nMethods); 1443 if (status != JNI_OK || env->ExceptionOccurred()) { 1444 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 1445 env->ExceptionClear(); 1446 return false; 1447 } 1448 return true; 1449 } 1450 1451 /** 1452 * This one function is exported, used by NativeLookup. 1453 */ 1454 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1455 assert(!MethodHandles::enabled(), "must not be enabled"); 1456 bool enable_MH = true; 1457 1458 jclass MH_class = NULL; 1459 if (SystemDictionary::MethodHandle_klass() == NULL) { 1460 enable_MH = false; 1461 } else { 1462 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1463 MH_class = (jclass) JNIHandles::make_local(env, mirror); 1464 } 1465 1466 if (enable_MH) { 1467 ThreadToNativeFromVM ttnfv(thread); 1468 1469 if (enable_MH) { 1470 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1471 } 1472 if (enable_MH) { 1473 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1474 } 1475 } 1476 1477 if (TraceInvokeDynamic) { 1478 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1479 } 1480 1481 if (enable_MH) { 1482 if (MethodHandles::generate_adapters() == false) { 1483 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters"); 1484 } 1485 MethodHandles::set_enabled(true); 1486 } 1487 } 1488 JVM_END