1 /* 2 * Copyright (c) 2008, 2014, 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/stringTable.hpp" 27 #include "compiler/compileBroker.hpp" 28 #include "interpreter/interpreter.hpp" 29 #include "interpreter/oopMapCache.hpp" 30 #include "memory/allocation.inline.hpp" 31 #include "memory/oopFactory.hpp" 32 #include "prims/jvmtiRedefineClassesTrace.hpp" 33 #include "prims/methodHandles.hpp" 34 #include "runtime/compilationPolicy.hpp" 35 #include "runtime/javaCalls.hpp" 36 #include "runtime/reflection.hpp" 37 #include "runtime/signature.hpp" 38 #include "runtime/stubRoutines.hpp" 39 40 41 /* 42 * JSR 292 reference implementation: method handles 43 * The JDK 7 reference implementation represented method handle 44 * combinations as chains. Each link in the chain had a "vmentry" 45 * field which pointed at a bit of assembly code which performed 46 * one transformation before dispatching to the next link in the chain. 47 * 48 * The current reference implementation pushes almost all code generation 49 * responsibility to (trusted) Java code. A method handle contains a 50 * pointer to its "LambdaForm", which embodies all details of the method 51 * handle's behavior. The LambdaForm is a normal Java object, managed 52 * by a runtime coded in Java. 53 */ 54 55 bool MethodHandles::_enabled = false; // set true after successful native linkage 56 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 57 58 //------------------------------------------------------------------------------ 59 // MethodHandles::generate_adapters 60 // 61 void MethodHandles::generate_adapters() { 62 if (SystemDictionary::MethodHandle_klass() == NULL) return; 63 64 assert(_adapter_code == NULL, "generate only once"); 65 66 ResourceMark rm; 67 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); 68 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 69 if (_adapter_code == NULL) 70 vm_exit_out_of_memory(adapter_code_size, OOM_MALLOC_ERROR, 71 "CodeCache: no room for MethodHandles adapters"); 72 { 73 CodeBuffer code(_adapter_code); 74 MethodHandlesAdapterGenerator g(&code); 75 g.generate(); 76 code.log_section_sizes("MethodHandlesAdapterBlob"); 77 } 78 } 79 80 //------------------------------------------------------------------------------ 81 // MethodHandlesAdapterGenerator::generate 82 // 83 void MethodHandlesAdapterGenerator::generate() { 84 // Generate generic method handle adapters. 85 // Generate interpreter entries 86 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 87 mk <= Interpreter::method_handle_invoke_LAST; 88 mk = Interpreter::MethodKind(1 + (int)mk)) { 89 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 90 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 91 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 92 if (entry != NULL) { 93 Interpreter::set_entry_for_kind(mk, entry); 94 } 95 // If the entry is not set, it will throw AbstractMethodError. 96 } 97 } 98 99 void MethodHandles::set_enabled(bool z) { 100 if (_enabled != z) { 101 guarantee(z, "can only enable once"); 102 _enabled = z; 103 } 104 } 105 106 // MemberName support 107 108 // import java_lang_invoke_MemberName.* 109 enum { 110 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 111 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 112 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 113 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 114 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 115 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 116 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 117 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 118 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 119 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 120 }; 121 122 Handle MethodHandles::new_MemberName(TRAPS) { 123 Handle empty; 124 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 125 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 126 return Handle(THREAD, k->allocate_instance(THREAD)); 127 } 128 129 oop MethodHandles::init_MemberName(Handle mname, Handle target) { 130 // This method is used from java.lang.invoke.MemberName constructors. 131 // It fills in the new MemberName from a java.lang.reflect.Member. 132 Thread* thread = Thread::current(); 133 oop target_oop = target(); 134 Klass* target_klass = target_oop->klass(); 135 if (target_klass == SystemDictionary::reflect_Field_klass()) { 136 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 137 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 138 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 139 if (!k.is_null() && k->oop_is_instance()) { 140 fieldDescriptor fd(InstanceKlass::cast(k()), slot); 141 oop mname2 = init_field_MemberName(mname, fd); 142 if (mname2 != NULL) { 143 // Since we have the reified name and type handy, add them to the result. 144 if (java_lang_invoke_MemberName::name(mname2) == NULL) 145 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 146 if (java_lang_invoke_MemberName::type(mname2) == NULL) 147 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 148 } 149 return mname2; 150 } 151 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 152 oop clazz = java_lang_reflect_Method::clazz(target_oop); 153 int slot = java_lang_reflect_Method::slot(target_oop); 154 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 155 if (!k.is_null() && k->oop_is_instance()) { 156 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 157 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 158 return NULL; // do not resolve unless there is a concrete signature 159 CallInfo info(m, k()); 160 return init_method_MemberName(mname, info); 161 } 162 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 163 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 164 int slot = java_lang_reflect_Constructor::slot(target_oop); 165 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 166 if (!k.is_null() && k->oop_is_instance()) { 167 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 168 if (m == NULL) return NULL; 169 CallInfo info(m, k()); 170 return init_method_MemberName(mname, info); 171 } 172 } 173 return NULL; 174 } 175 176 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 177 assert(info.resolved_appendix().is_null(), "only normal methods here"); 178 methodHandle m = info.resolved_method(); 179 KlassHandle m_klass = m->method_holder(); 180 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 181 int vmindex = Method::invalid_vtable_index; 182 183 switch (info.call_kind()) { 184 case CallInfo::itable_call: 185 vmindex = info.itable_index(); 186 // More importantly, the itable index only works with the method holder. 187 assert(m_klass->verify_itable_index(vmindex), ""); 188 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 189 if (TraceInvokeDynamic) { 190 ResourceMark rm; 191 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 192 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 193 vmindex); 194 m->access_flags().print_on(tty); 195 if (!m->is_abstract()) { 196 tty->print("default"); 197 } 198 tty->cr(); 199 } 200 break; 201 202 case CallInfo::vtable_call: 203 vmindex = info.vtable_index(); 204 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 205 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe"); 206 if (m_klass->is_interface()) { 207 // This is a vtable call to an interface method (abstract "miranda method" or default method). 208 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 209 // (LinkResolver should help us figure this out.) 210 KlassHandle m_klass_non_interface = info.resolved_klass(); 211 if (m_klass_non_interface->is_interface()) { 212 m_klass_non_interface = SystemDictionary::Object_klass(); 213 #ifdef ASSERT 214 { ResourceMark rm; 215 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex); 216 assert(m->name() == m2->name() && m->signature() == m2->signature(), 217 err_msg("at %d, %s != %s", vmindex, 218 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string())); 219 } 220 #endif //ASSERT 221 } 222 if (!m->is_public()) { 223 assert(m->is_public(), "virtual call must be to public interface method"); 224 return NULL; // elicit an error later in product build 225 } 226 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe"); 227 m_klass = m_klass_non_interface; 228 } 229 if (TraceInvokeDynamic) { 230 ResourceMark rm; 231 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 232 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 233 m_klass->internal_name(), vmindex); 234 m->access_flags().print_on(tty); 235 if (m->is_default_method()) { 236 tty->print("default"); 237 } 238 tty->cr(); 239 } 240 break; 241 242 case CallInfo::direct_call: 243 vmindex = Method::nonvirtual_vtable_index; 244 if (m->is_static()) { 245 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 246 } else if (m->is_initializer()) { 247 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 248 } else { 249 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 250 } 251 break; 252 253 default: assert(false, "bad CallInfo"); return NULL; 254 } 255 256 // @CallerSensitive annotation detected 257 if (m->caller_sensitive()) { 258 flags |= CALLER_SENSITIVE; 259 } 260 261 oop mname_oop = mname(); 262 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 263 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); 264 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 265 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror()); 266 // Note: name and type can be lazily computed by resolve_MemberName, 267 // if Java code needs them as resolved String and MethodType objects. 268 // The clazz must be eagerly stored, because it provides a GC 269 // root to help keep alive the Method*. 270 // If relevant, the vtable or itable value is stored as vmindex. 271 // This is done eagerly, since it is readily available without 272 // constructing any new objects. 273 // TO DO: maybe intern mname_oop 274 m->method_holder()->add_member_name(m->method_idnum(), mname); 275 276 return mname(); 277 } 278 279 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 280 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 281 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 282 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 283 Metadata* vmtarget = fd.field_holder(); 284 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 285 oop mname_oop = mname(); 286 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 287 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 288 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 289 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); 290 oop type = field_signature_type_or_null(fd.signature()); 291 oop name = field_name_or_null(fd.name()); 292 if (name != NULL) 293 java_lang_invoke_MemberName::set_name(mname_oop, name); 294 if (type != NULL) 295 java_lang_invoke_MemberName::set_type(mname_oop, type); 296 // Note: name and type can be lazily computed by resolve_MemberName, 297 // if Java code needs them as resolved String and Class objects. 298 // Note that the incoming type oop might be pre-resolved (non-null). 299 // The base clazz and field offset (vmindex) must be eagerly stored, 300 // because they unambiguously identify the field. 301 // Although the fieldDescriptor::_index would also identify the field, 302 // we do not use it, because it is harder to decode. 303 // TO DO: maybe intern mname_oop 304 return mname(); 305 } 306 307 // JVM 2.9 Special Methods: 308 // A method is signature polymorphic if and only if all of the following conditions hold : 309 // * It is declared in the java.lang.invoke.MethodHandle class. 310 // * It has a single formal parameter of type Object[]. 311 // * It has a return type of Object. 312 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 313 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 314 if (klass == NULL) 315 return false; 316 // The following test will fail spuriously during bootstrap of MethodHandle itself: 317 // if (klass != SystemDictionary::MethodHandle_klass()) 318 // Test the name instead: 319 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle()) 320 return false; 321 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 322 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig); 323 if (m == NULL) return false; 324 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 325 int flags = m->access_flags().as_int(); 326 return (flags & required) == required; 327 } 328 329 330 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 331 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid)); 332 switch (iid) { 333 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 334 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 335 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 336 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 337 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 338 } 339 assert(false, ""); 340 return 0; 341 } 342 343 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 344 switch (iid) { 345 case vmIntrinsics::_invokeBasic: return 0; 346 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 347 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 348 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 349 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 350 } 351 assert(false, err_msg("iid=%d", iid)); 352 return 0; 353 } 354 355 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 356 vmSymbols::SID name_id = vmSymbols::find_sid(name); 357 switch (name_id) { 358 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 359 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 360 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 361 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 362 363 // There is one static signature-polymorphic method for each JVM invocation mode. 364 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 365 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 366 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 367 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 368 } 369 370 // Cover the case of invokeExact and any future variants of invokeFoo. 371 Klass* mh_klass = SystemDictionary::well_known_klass( 372 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 373 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) 374 return vmIntrinsics::_invokeGeneric; 375 376 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 377 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 378 return vmIntrinsics::_none; 379 } 380 381 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 382 if (klass != NULL && 383 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) { 384 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 385 if (iid != vmIntrinsics::_none) 386 return iid; 387 if (is_method_handle_invoke_name(klass, name)) 388 return vmIntrinsics::_invokeGeneric; 389 } 390 return vmIntrinsics::_none; 391 } 392 393 394 // convert the external string or reflective type to an internal signature 395 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 396 if (java_lang_invoke_MethodType::is_instance(type_str)) { 397 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL); 398 } else if (java_lang_Class::is_instance(type_str)) { 399 return java_lang_Class::as_signature(type_str, false, CHECK_NULL); 400 } else if (java_lang_String::is_instance(type_str)) { 401 if (intern_if_not_found) { 402 return java_lang_String::as_symbol(type_str, CHECK_NULL); 403 } else { 404 return java_lang_String::as_symbol_or_null(type_str); 405 } 406 } else { 407 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 408 } 409 } 410 411 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 412 enum { OBJ_SIG_LEN = 18 }; 413 414 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 415 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 416 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 417 const int len = sig->utf8_length(); 418 for (int i = 0; i < len; i++) { 419 switch (sig->byte_at(i)) { 420 case 'L': 421 // only java/lang/Object is valid here 422 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 423 return false; 424 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 425 continue; 426 case '(': case ')': case 'V': 427 case 'I': case 'J': case 'F': case 'D': 428 continue; 429 //case '[': 430 //case 'Z': case 'B': case 'C': case 'S': 431 default: 432 return false; 433 } 434 } 435 return true; 436 } 437 438 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 439 Symbol* bsig = NULL; 440 if (sig == NULL) { 441 return sig; 442 } else if (is_basic_type_signature(sig)) { 443 sig->increment_refcount(); 444 return sig; // that was easy 445 } else if (sig->byte_at(0) != '(') { 446 BasicType bt = char2type(sig->byte_at(0)); 447 if (is_subword_type(bt)) { 448 bsig = vmSymbols::int_signature(); 449 } else { 450 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 451 bsig = vmSymbols::object_signature(); 452 } 453 } else { 454 ResourceMark rm; 455 stringStream buffer(128); 456 buffer.put('('); 457 int arg_pos = 0, keep_arg_pos = -1; 458 if (keep_last_arg) 459 keep_arg_pos = ArgumentCount(sig).size() - 1; 460 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 461 BasicType bt = ss.type(); 462 size_t this_arg_pos = buffer.size(); 463 if (ss.at_return_type()) { 464 buffer.put(')'); 465 } 466 if (arg_pos == keep_arg_pos) { 467 buffer.write((char*) ss.raw_bytes(), 468 (int) ss.raw_length()); 469 } else if (bt == T_OBJECT || bt == T_ARRAY) { 470 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 471 } else { 472 if (is_subword_type(bt)) 473 bt = T_INT; 474 buffer.put(type2char(bt)); 475 } 476 arg_pos++; 477 } 478 const char* sigstr = buffer.base(); 479 int siglen = (int) buffer.size(); 480 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 481 } 482 assert(is_basic_type_signature(bsig) || 483 // detune assert in case the injected argument is not a basic type: 484 keep_last_arg, ""); 485 return bsig; 486 } 487 488 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 489 Symbol* sig, 490 bool keep_arrays, 491 bool keep_basic_names) { 492 st = st ? st : tty; 493 int len = sig->utf8_length(); 494 int array = 0; 495 bool prev_type = false; 496 for (int i = 0; i < len; i++) { 497 char ch = sig->byte_at(i); 498 switch (ch) { 499 case '(': case ')': 500 prev_type = false; 501 st->put(ch); 502 continue; 503 case '[': 504 if (!keep_basic_names && keep_arrays) 505 st->put(ch); 506 array++; 507 continue; 508 case 'L': 509 { 510 if (prev_type) st->put(','); 511 int start = i+1, slash = start; 512 while (++i < len && (ch = sig->byte_at(i)) != ';') { 513 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 514 } 515 if (slash < i) start = slash; 516 if (!keep_basic_names) { 517 st->put('L'); 518 } else { 519 for (int j = start; j < i; j++) 520 st->put(sig->byte_at(j)); 521 prev_type = true; 522 } 523 break; 524 } 525 default: 526 { 527 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 528 ch = '['; 529 array = 0; 530 } 531 if (prev_type) st->put(','); 532 const char* n = NULL; 533 if (keep_basic_names) 534 n = type2name(char2type(ch)); 535 if (n == NULL) { 536 // unknown letter, or we don't want to know its name 537 st->put(ch); 538 } else { 539 st->print("%s", n); 540 prev_type = true; 541 } 542 break; 543 } 544 } 545 // Switch break goes here to take care of array suffix: 546 if (prev_type) { 547 while (array > 0) { 548 st->print("[]"); 549 --array; 550 } 551 } 552 array = 0; 553 } 554 } 555 556 557 558 static oop object_java_mirror() { 559 return SystemDictionary::Object_klass()->java_mirror(); 560 } 561 562 oop MethodHandles::field_name_or_null(Symbol* s) { 563 if (s == NULL) return NULL; 564 return StringTable::lookup(s); 565 } 566 567 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 568 if (s == NULL) return NULL; 569 BasicType bt = FieldType::basic_type(s); 570 if (is_java_primitive(bt)) { 571 assert(s->utf8_length() == 1, ""); 572 return java_lang_Class::primitive_mirror(bt); 573 } 574 // Here are some more short cuts for common types. 575 // They are optional, since reference types can be resolved lazily. 576 if (bt == T_OBJECT) { 577 if (s == vmSymbols::object_signature()) { 578 return object_java_mirror(); 579 } else if (s == vmSymbols::class_signature()) { 580 return SystemDictionary::Class_klass()->java_mirror(); 581 } else if (s == vmSymbols::string_signature()) { 582 return SystemDictionary::String_klass()->java_mirror(); 583 } 584 } 585 return NULL; 586 } 587 588 589 // An unresolved member name is a mere symbolic reference. 590 // Resolving it plants a vmtarget/vmindex in it, 591 // which refers directly to JVM internals. 592 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) { 593 Handle empty; 594 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 595 596 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 597 // Already resolved. 598 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 599 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 600 return mname; 601 } 602 603 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 604 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 605 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 606 int flags = java_lang_invoke_MemberName::flags(mname()); 607 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 608 if (!ref_kind_is_valid(ref_kind)) { 609 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 610 } 611 612 DEBUG_ONLY(int old_vmindex); 613 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 614 615 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 616 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 617 } 618 619 instanceKlassHandle defc; 620 { 621 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 622 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 623 if (!defc_klass->oop_is_instance()) { 624 if (!defc_klass->oop_is_array()) return empty; 625 defc_klass = SystemDictionary::Object_klass(); 626 } 627 defc = instanceKlassHandle(THREAD, defc_klass); 628 } 629 if (defc.is_null()) { 630 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 631 } 632 defc->link_class(CHECK_(empty)); // possible safepoint 633 634 // convert the external string name to an internal symbol 635 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 636 if (name == NULL) return empty; // no such name 637 if (name == vmSymbols::class_initializer_name()) 638 return empty; // illegal name 639 640 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 641 if ((flags & ALL_KINDS) == IS_METHOD && 642 (defc() == SystemDictionary::MethodHandle_klass()) && 643 (ref_kind == JVM_REF_invokeVirtual || 644 ref_kind == JVM_REF_invokeSpecial || 645 // static invocation mode is required for _linkToVirtual, etc.: 646 ref_kind == JVM_REF_invokeStatic)) { 647 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 648 if (iid != vmIntrinsics::_none && 649 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 650 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 651 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 652 mh_invoke_id = iid; 653 } 654 } 655 656 // convert the external string or reflective type to an internal signature 657 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 658 if (type == NULL) return empty; // no such signature exists in the VM 659 660 // Time to do the lookup. 661 switch (flags & ALL_KINDS) { 662 case IS_METHOD: 663 { 664 CallInfo result; 665 { 666 assert(!HAS_PENDING_EXCEPTION, ""); 667 if (ref_kind == JVM_REF_invokeStatic) { 668 LinkResolver::resolve_static_call(result, 669 defc, name, type, caller, caller.not_null(), false, THREAD); 670 } else if (ref_kind == JVM_REF_invokeInterface) { 671 LinkResolver::resolve_interface_call(result, Handle(), defc, 672 defc, name, type, caller, caller.not_null(), false, THREAD); 673 } else if (mh_invoke_id != vmIntrinsics::_none) { 674 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 675 LinkResolver::resolve_handle_call(result, 676 defc, name, type, caller, THREAD); 677 } else if (ref_kind == JVM_REF_invokeSpecial) { 678 LinkResolver::resolve_special_call(result, 679 defc, name, type, caller, caller.not_null(), THREAD); 680 } else if (ref_kind == JVM_REF_invokeVirtual) { 681 LinkResolver::resolve_virtual_call(result, Handle(), defc, 682 defc, name, type, caller, caller.not_null(), false, THREAD); 683 } else { 684 assert(false, err_msg("ref_kind=%d", ref_kind)); 685 } 686 if (HAS_PENDING_EXCEPTION) { 687 return empty; 688 } 689 } 690 if (result.resolved_appendix().not_null()) { 691 // The resolved MemberName must not be accompanied by an appendix argument, 692 // since there is no way to bind this value into the MemberName. 693 // Caller is responsible to prevent this from happening. 694 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 695 } 696 oop mname2 = init_method_MemberName(mname, result); 697 return Handle(THREAD, mname2); 698 } 699 case IS_CONSTRUCTOR: 700 { 701 CallInfo result; 702 { 703 assert(!HAS_PENDING_EXCEPTION, ""); 704 if (name == vmSymbols::object_initializer_name()) { 705 LinkResolver::resolve_special_call(result, 706 defc, name, type, caller, caller.not_null(), THREAD); 707 } else { 708 break; // will throw after end of switch 709 } 710 if (HAS_PENDING_EXCEPTION) { 711 return empty; 712 } 713 } 714 assert(result.is_statically_bound(), ""); 715 oop mname2 = init_method_MemberName(mname, result); 716 return Handle(THREAD, mname2); 717 } 718 case IS_FIELD: 719 { 720 fieldDescriptor result; // find_field initializes fd if found 721 { 722 assert(!HAS_PENDING_EXCEPTION, ""); 723 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD); 724 if (HAS_PENDING_EXCEPTION) { 725 return empty; 726 } 727 } 728 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 729 return Handle(THREAD, mname2); 730 } 731 default: 732 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 733 } 734 735 return empty; 736 } 737 738 // Conversely, a member name which is only initialized from JVM internals 739 // may have null defc, name, and type fields. 740 // Resolving it plants a vmtarget/vmindex in it, 741 // which refers directly to JVM internals. 742 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 743 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 744 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 745 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 746 if (vmtarget == NULL) { 747 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 748 } 749 750 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 751 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 752 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 753 int flags = java_lang_invoke_MemberName::flags(mname()); 754 755 if (suppress != 0) { 756 if (suppress & _suppress_defc) have_defc = true; 757 if (suppress & _suppress_name) have_name = true; 758 if (suppress & _suppress_type) have_type = true; 759 } 760 761 if (have_defc && have_name && have_type) return; // nothing needed 762 763 switch (flags & ALL_KINDS) { 764 case IS_METHOD: 765 case IS_CONSTRUCTOR: 766 { 767 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 768 methodHandle m(THREAD, (Method*)vmtarget); 769 DEBUG_ONLY(vmtarget = NULL); // safety 770 if (m.is_null()) break; 771 if (!have_defc) { 772 InstanceKlass* defc = m->method_holder(); 773 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 774 } 775 if (!have_name) { 776 //not java_lang_String::create_from_symbol; let's intern member names 777 Handle name = StringTable::intern(m->name(), CHECK); 778 java_lang_invoke_MemberName::set_name(mname(), name()); 779 } 780 if (!have_type) { 781 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 782 java_lang_invoke_MemberName::set_type(mname(), type()); 783 } 784 return; 785 } 786 case IS_FIELD: 787 { 788 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 789 if (!((Klass*) vmtarget)->oop_is_instance()) break; 790 instanceKlassHandle defc(THREAD, (Klass*) vmtarget); 791 DEBUG_ONLY(vmtarget = NULL); // safety 792 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 793 fieldDescriptor fd; // find_field initializes fd if found 794 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 795 break; // cannot expand 796 if (!have_defc) { 797 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 798 } 799 if (!have_name) { 800 //not java_lang_String::create_from_symbol; let's intern member names 801 Handle name = StringTable::intern(fd.name(), CHECK); 802 java_lang_invoke_MemberName::set_name(mname(), name()); 803 } 804 if (!have_type) { 805 // If it is a primitive field type, don't mess with short strings like "I". 806 Handle type = field_signature_type_or_null(fd.signature()); 807 if (type.is_null()) { 808 java_lang_String::create_from_symbol(fd.signature(), CHECK); 809 } 810 java_lang_invoke_MemberName::set_type(mname(), type()); 811 } 812 return; 813 } 814 } 815 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 816 } 817 818 int MethodHandles::find_MemberNames(KlassHandle k, 819 Symbol* name, Symbol* sig, 820 int mflags, KlassHandle caller, 821 int skip, objArrayHandle results) { 822 // %%% take caller into account! 823 824 Thread* thread = Thread::current(); 825 826 if (k.is_null() || !k->oop_is_instance()) return -1; 827 828 int rfill = 0, rlimit = results->length(), rskip = skip; 829 // overflow measurement: 830 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 831 832 int match_flags = mflags; 833 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 834 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 835 bool local_only = !(search_superc | search_intfc); 836 bool classes_only = false; 837 838 if (name != NULL) { 839 if (name->utf8_length() == 0) return 0; // a match is not possible 840 } 841 if (sig != NULL) { 842 if (sig->utf8_length() == 0) return 0; // a match is not possible 843 if (sig->byte_at(0) == '(') 844 match_flags &= ~(IS_FIELD | IS_TYPE); 845 else 846 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 847 } 848 849 if ((match_flags & IS_TYPE) != 0) { 850 // NYI, and Core Reflection works quite well for this query 851 } 852 853 if ((match_flags & IS_FIELD) != 0) { 854 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 855 if (name != NULL && st.name() != name) 856 continue; 857 if (sig != NULL && st.signature() != sig) 858 continue; 859 // passed the filters 860 if (rskip > 0) { 861 --rskip; 862 } else if (rfill < rlimit) { 863 Handle result(thread, results->obj_at(rfill++)); 864 if (!java_lang_invoke_MemberName::is_instance(result())) 865 return -99; // caller bug! 866 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 867 if (saved != result()) 868 results->obj_at_put(rfill-1, saved); // show saved instance to user 869 } else if (++overflow >= overflow_limit) { 870 match_flags = 0; break; // got tired of looking at overflow 871 } 872 } 873 } 874 875 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 876 // watch out for these guys: 877 Symbol* init_name = vmSymbols::object_initializer_name(); 878 Symbol* clinit_name = vmSymbols::class_initializer_name(); 879 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 880 bool negate_name_test = false; 881 // fix name so that it captures the intention of IS_CONSTRUCTOR 882 if (!(match_flags & IS_METHOD)) { 883 // constructors only 884 if (name == NULL) { 885 name = init_name; 886 } else if (name != init_name) { 887 return 0; // no constructors of this method name 888 } 889 } else if (!(match_flags & IS_CONSTRUCTOR)) { 890 // methods only 891 if (name == NULL) { 892 name = init_name; 893 negate_name_test = true; // if we see the name, we *omit* the entry 894 } else if (name == init_name) { 895 return 0; // no methods of this constructor name 896 } 897 } else { 898 // caller will accept either sort; no need to adjust name 899 } 900 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 901 Method* m = st.method(); 902 Symbol* m_name = m->name(); 903 if (m_name == clinit_name) 904 continue; 905 if (name != NULL && ((m_name != name) ^ negate_name_test)) 906 continue; 907 if (sig != NULL && m->signature() != sig) 908 continue; 909 // passed the filters 910 if (rskip > 0) { 911 --rskip; 912 } else if (rfill < rlimit) { 913 Handle result(thread, results->obj_at(rfill++)); 914 if (!java_lang_invoke_MemberName::is_instance(result())) 915 return -99; // caller bug! 916 CallInfo info(m); 917 oop saved = MethodHandles::init_method_MemberName(result, info); 918 if (saved != result()) 919 results->obj_at_put(rfill-1, saved); // show saved instance to user 920 } else if (++overflow >= overflow_limit) { 921 match_flags = 0; break; // got tired of looking at overflow 922 } 923 } 924 } 925 926 // return number of elements we at leasted wanted to initialize 927 return rfill + overflow; 928 } 929 930 //------------------------------------------------------------------------------ 931 // MemberNameTable 932 // 933 934 MemberNameTable::MemberNameTable(int methods_cnt) 935 : GrowableArray<jweak>(methods_cnt, true) { 936 assert_locked_or_safepoint(MemberNameTable_lock); 937 } 938 939 MemberNameTable::~MemberNameTable() { 940 assert_locked_or_safepoint(MemberNameTable_lock); 941 int len = this->length(); 942 943 for (int idx = 0; idx < len; idx++) { 944 jweak ref = this->at(idx); 945 JNIHandles::destroy_weak_global(ref); 946 } 947 } 948 949 void MemberNameTable::add_member_name(int index, jweak mem_name_wref) { 950 assert_locked_or_safepoint(MemberNameTable_lock); 951 this->at_put_grow(index, mem_name_wref); 952 } 953 954 // Return a member name oop or NULL. 955 oop MemberNameTable::get_member_name(int index) { 956 assert_locked_or_safepoint(MemberNameTable_lock); 957 958 jweak ref = this->at(index); 959 oop mem_name = JNIHandles::resolve(ref); 960 return mem_name; 961 } 962 963 #if INCLUDE_JVMTI 964 oop MemberNameTable::find_member_name_by_method(Method* old_method) { 965 assert_locked_or_safepoint(MemberNameTable_lock); 966 oop found = NULL; 967 int len = this->length(); 968 969 for (int idx = 0; idx < len; idx++) { 970 oop mem_name = JNIHandles::resolve(this->at(idx)); 971 if (mem_name == NULL) { 972 continue; 973 } 974 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); 975 if (method == old_method) { 976 found = mem_name; 977 break; 978 } 979 } 980 return found; 981 } 982 983 // It is called at safepoint only 984 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods, 985 int methods_length, bool *trace_name_printed) { 986 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 987 // search the MemberNameTable for uses of either obsolete or EMCP methods 988 for (int j = 0; j < methods_length; j++) { 989 Method* old_method = old_methods[j]; 990 Method* new_method = new_methods[j]; 991 oop mem_name = find_member_name_by_method(old_method); 992 if (mem_name != NULL) { 993 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method); 994 995 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 996 if (!(*trace_name_printed)) { 997 // RC_TRACE_MESG macro has an embedded ResourceMark 998 RC_TRACE_MESG(("adjust: name=%s", 999 old_method->method_holder()->external_name())); 1000 *trace_name_printed = true; 1001 } 1002 // RC_TRACE macro has an embedded ResourceMark 1003 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)", 1004 new_method->name()->as_C_string(), 1005 new_method->signature()->as_C_string())); 1006 } 1007 } 1008 } 1009 } 1010 #endif // INCLUDE_JVMTI 1011 1012 // 1013 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1014 // They are the private interface between this JVM and the HotSpot-specific 1015 // Java code that implements JSR 292 method handles. 1016 // 1017 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1018 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1019 // 1020 1021 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) { 1022 switch (which) { 1023 case MethodHandles::GC_COUNT_GWT: 1024 #ifdef COMPILER2 1025 return true; 1026 #else 1027 return false; 1028 #endif 1029 } 1030 return 0; 1031 } 1032 JVM_END 1033 1034 #ifndef PRODUCT 1035 #define EACH_NAMED_CON(template, requirement) \ 1036 template(MethodHandles,GC_COUNT_GWT) \ 1037 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1038 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1039 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1040 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1041 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1042 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1043 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1044 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1045 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1046 template(MethodHandles,GC_LAMBDA_SUPPORT) \ 1047 /*end*/ 1048 1049 #define IGNORE_REQ(req_expr) /* req_expr */ 1050 #define ONE_PLUS(scope,value) 1+ 1051 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1052 #define VALUE_COMMA(scope,value) scope::value, 1053 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1054 #define STRING_NULL(scope,value) #value "\0" 1055 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1056 1057 static bool advertise_con_value(int which) { 1058 if (which < 0) return false; 1059 bool ok = true; 1060 int count = 0; 1061 #define INC_COUNT(scope,value) \ 1062 ++count; 1063 #define CHECK_REQ(req_expr) \ 1064 if (which < count) return ok; \ 1065 ok = (req_expr); 1066 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1067 #undef INC_COUNT 1068 #undef CHECK_REQ 1069 assert(count == con_value_count, ""); 1070 if (which < count) return ok; 1071 return false; 1072 } 1073 1074 #undef ONE_PLUS 1075 #undef VALUE_COMMA 1076 #undef STRING_NULL 1077 #undef EACH_NAMED_CON 1078 #endif // PRODUCT 1079 1080 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1081 #ifndef PRODUCT 1082 if (advertise_con_value(which)) { 1083 assert(which >= 0 && which < con_value_count, ""); 1084 int con = con_values[which]; 1085 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1086 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1087 const char* str = &con_names[0]; 1088 for (int i = 0; i < which; i++) 1089 str += strlen(str) + 1; // skip name and null 1090 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1091 box->obj_at_put(0, name); 1092 } 1093 return con; 1094 } 1095 #endif 1096 return 0; 1097 } 1098 JVM_END 1099 1100 // void init(MemberName self, AccessibleObject ref) 1101 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1102 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1103 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1104 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1105 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1106 MethodHandles::init_MemberName(mname, target); 1107 } 1108 JVM_END 1109 1110 // void expand(MemberName self) 1111 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1112 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1113 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1114 MethodHandles::expand_MemberName(mname, 0, CHECK); 1115 } 1116 JVM_END 1117 1118 // void resolve(MemberName self, Class<?> caller) 1119 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1120 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1121 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1122 1123 // The trusted Java code that calls this method should already have performed 1124 // access checks on behalf of the given caller. But, we can verify this. 1125 if (VerifyMethodHandles && caller_jh != NULL && 1126 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1127 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1128 if (reference_klass != NULL && reference_klass->oop_is_objArray()) { 1129 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1130 } 1131 1132 // Reflection::verify_class_access can only handle instance classes. 1133 if (reference_klass != NULL && reference_klass->oop_is_instance()) { 1134 // Emulate LinkResolver::check_klass_accessability. 1135 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1136 if (!Reflection::verify_class_access(caller, 1137 reference_klass, 1138 true)) { 1139 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1140 } 1141 } 1142 } 1143 1144 KlassHandle caller(THREAD, 1145 caller_jh == NULL ? (Klass*) NULL : 1146 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh))); 1147 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1148 1149 if (resolved.is_null()) { 1150 int flags = java_lang_invoke_MemberName::flags(mname()); 1151 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1152 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1153 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1154 } 1155 if ((flags & ALL_KINDS) == IS_FIELD) { 1156 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); 1157 } else if ((flags & ALL_KINDS) == IS_METHOD || 1158 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1159 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); 1160 } else { 1161 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1162 } 1163 } 1164 1165 return JNIHandles::make_local(THREAD, resolved()); 1166 } 1167 JVM_END 1168 1169 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1170 if (mname == NULL || 1171 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1172 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1173 } else { 1174 int flags = java_lang_invoke_MemberName::flags(mname); 1175 if ((flags & IS_FIELD) != 0 && 1176 (must_be_static 1177 ? (flags & JVM_ACC_STATIC) != 0 1178 : (flags & JVM_ACC_STATIC) == 0)) { 1179 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1180 return (jlong) vmindex; 1181 } 1182 } 1183 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1184 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1185 return 0; 1186 } 1187 1188 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1189 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1190 } 1191 JVM_END 1192 1193 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1194 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1195 } 1196 JVM_END 1197 1198 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1199 // use the other function to perform sanity checks: 1200 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1201 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1202 return JNIHandles::make_local(THREAD, clazz); 1203 } 1204 JVM_END 1205 1206 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1207 if (mname_jh == NULL) return NULL; 1208 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1209 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1210 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1211 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1212 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1213 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1214 result->obj_at_put(0, x); 1215 x = NULL; 1216 if (vmtarget == NULL) { 1217 x = NULL; 1218 } else if (vmtarget->is_klass()) { 1219 x = ((Klass*) vmtarget)->java_mirror(); 1220 } else if (vmtarget->is_method()) { 1221 x = mname(); 1222 } 1223 result->obj_at_put(1, x); 1224 return JNIHandles::make_local(env, result()); 1225 } 1226 JVM_END 1227 1228 1229 1230 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1231 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1232 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1233 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1234 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1235 if (clazz_jh == NULL || results_jh == NULL) return -1; 1236 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); 1237 1238 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1239 if (results.is_null() || !results->is_objArray()) return -1; 1240 1241 TempNewSymbol name = NULL; 1242 TempNewSymbol sig = NULL; 1243 if (name_jh != NULL) { 1244 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1245 if (name == NULL) return 0; // a match is not possible 1246 } 1247 if (sig_jh != NULL) { 1248 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1249 if (sig == NULL) return 0; // a match is not possible 1250 } 1251 1252 KlassHandle caller; 1253 if (caller_jh != NULL) { 1254 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1255 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1256 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); 1257 } 1258 1259 if (name != NULL && sig != NULL && results.not_null()) { 1260 // try a direct resolve 1261 // %%% TO DO 1262 } 1263 1264 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1265 caller, skip, results); 1266 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1267 return res; 1268 } 1269 JVM_END 1270 1271 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1272 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1273 Handle target (THREAD, JNIHandles::resolve(target_jh)); 1274 { 1275 // Walk all nmethods depending on this call site. 1276 MutexLocker mu(Compile_lock, thread); 1277 Universe::flush_dependents_on(call_site, target); 1278 java_lang_invoke_CallSite::set_target(call_site(), target()); 1279 } 1280 } 1281 JVM_END 1282 1283 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1284 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1285 Handle target (THREAD, JNIHandles::resolve(target_jh)); 1286 { 1287 // Walk all nmethods depending on this call site. 1288 MutexLocker mu(Compile_lock, thread); 1289 Universe::flush_dependents_on(call_site, target); 1290 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1291 } 1292 } 1293 JVM_END 1294 1295 /** 1296 * Throws a java/lang/UnsupportedOperationException unconditionally. 1297 * This is required by the specification of MethodHandle.invoke if 1298 * invoked directly. 1299 */ 1300 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1301 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1302 return NULL; 1303 } 1304 JVM_END 1305 1306 /** 1307 * Throws a java/lang/UnsupportedOperationException unconditionally. 1308 * This is required by the specification of MethodHandle.invokeExact if 1309 * invoked directly. 1310 */ 1311 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1312 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1313 return NULL; 1314 } 1315 JVM_END 1316 1317 /// JVM_RegisterMethodHandleMethods 1318 1319 #undef CS // Solaris builds complain 1320 1321 #define LANG "Ljava/lang/" 1322 #define JLINV "Ljava/lang/invoke/" 1323 1324 #define OBJ LANG"Object;" 1325 #define CLS LANG"Class;" 1326 #define STRG LANG"String;" 1327 #define CS JLINV"CallSite;" 1328 #define MT JLINV"MethodType;" 1329 #define MH JLINV"MethodHandle;" 1330 #define MEM JLINV"MemberName;" 1331 1332 #define CC (char*) /*cast a literal from (const char*)*/ 1333 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1334 1335 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1336 static JNINativeMethod MHN_methods[] = { 1337 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)}, 1338 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)}, 1339 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)}, 1340 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)}, 1341 // static native int getNamedCon(int which, Object[] name) 1342 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)}, 1343 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1344 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1345 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}, 1346 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)}, 1347 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1348 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1349 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)}, 1350 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)}, 1351 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)} 1352 }; 1353 1354 static JNINativeMethod MH_methods[] = { 1355 // UnsupportedOperationException throwers 1356 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)}, 1357 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)} 1358 }; 1359 1360 /** 1361 * Helper method to register native methods. 1362 */ 1363 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1364 int status = env->RegisterNatives(clazz, methods, nMethods); 1365 if (status != JNI_OK || env->ExceptionOccurred()) { 1366 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 1367 env->ExceptionClear(); 1368 return false; 1369 } 1370 return true; 1371 } 1372 1373 /** 1374 * This one function is exported, used by NativeLookup. 1375 */ 1376 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1377 assert(!MethodHandles::enabled(), "must not be enabled"); 1378 bool enable_MH = true; 1379 1380 jclass MH_class = NULL; 1381 if (SystemDictionary::MethodHandle_klass() == NULL) { 1382 enable_MH = false; 1383 } else { 1384 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1385 MH_class = (jclass) JNIHandles::make_local(env, mirror); 1386 } 1387 1388 if (enable_MH) { 1389 ThreadToNativeFromVM ttnfv(thread); 1390 1391 if (enable_MH) { 1392 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1393 } 1394 if (enable_MH) { 1395 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1396 } 1397 } 1398 1399 if (TraceInvokeDynamic) { 1400 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1401 } 1402 1403 if (enable_MH) { 1404 MethodHandles::generate_adapters(); 1405 MethodHandles::set_enabled(true); 1406 } 1407 } 1408 JVM_END