1 /* 2 * Copyright (c) 2008, 2018, 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/symbolTable.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/methodHandles.hpp" 33 #include "prims/jvmtiRedefineClassesTrace.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 (!EnableInvokeDynamic || 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 && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic"); 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, bool intern) { 177 assert(info.resolved_appendix().is_null(), "only normal methods here"); 178 methodHandle m = info.resolved_method(); 179 assert(m.not_null(), "null method handle"); 180 KlassHandle m_klass = m->method_holder(); 181 assert(m.not_null(), "null holder for method handle"); 182 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 183 int vmindex = Method::invalid_vtable_index; 184 185 switch (info.call_kind()) { 186 case CallInfo::itable_call: 187 vmindex = info.itable_index(); 188 // More importantly, the itable index only works with the method holder. 189 assert(m_klass->verify_itable_index(vmindex), ""); 190 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 191 if (TraceInvokeDynamic) { 192 ResourceMark rm; 193 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 194 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 195 vmindex); 196 m->access_flags().print_on(tty); 197 if (!m->is_abstract()) { 198 tty->print("default"); 199 } 200 tty->cr(); 201 } 202 break; 203 204 case CallInfo::vtable_call: 205 vmindex = info.vtable_index(); 206 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 207 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe"); 208 if (m_klass->is_interface()) { 209 // This is a vtable call to an interface method (abstract "miranda method" or default method). 210 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 211 // (LinkResolver should help us figure this out.) 212 KlassHandle m_klass_non_interface = info.resolved_klass(); 213 if (m_klass_non_interface->is_interface()) { 214 m_klass_non_interface = SystemDictionary::Object_klass(); 215 #ifdef ASSERT 216 { ResourceMark rm; 217 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex); 218 assert(m->name() == m2->name() && m->signature() == m2->signature(), 219 err_msg("at %d, %s != %s", vmindex, 220 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string())); 221 } 222 #endif //ASSERT 223 } 224 if (!m->is_public()) { 225 assert(m->is_public(), "virtual call must be to public interface method"); 226 return NULL; // elicit an error later in product build 227 } 228 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe"); 229 m_klass = m_klass_non_interface; 230 } 231 if (TraceInvokeDynamic) { 232 ResourceMark rm; 233 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 234 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 235 m_klass->internal_name(), vmindex); 236 m->access_flags().print_on(tty); 237 if (m->is_default_method()) { 238 tty->print("default"); 239 } 240 tty->cr(); 241 } 242 break; 243 244 case CallInfo::direct_call: 245 vmindex = Method::nonvirtual_vtable_index; 246 if (m->is_static()) { 247 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 248 } else if (m->is_initializer()) { 249 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 250 } else { 251 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 252 } 253 break; 254 255 default: assert(false, "bad CallInfo"); return NULL; 256 } 257 258 // @CallerSensitive annotation detected 259 if (m->caller_sensitive()) { 260 flags |= CALLER_SENSITIVE; 261 } 262 263 oop mname_oop = mname(); 264 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 265 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); 266 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 267 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror()); 268 // Note: name and type can be lazily computed by resolve_MemberName, 269 // if Java code needs them as resolved String and MethodType objects. 270 // The clazz must be eagerly stored, because it provides a GC 271 // root to help keep alive the Method*. 272 // If relevant, the vtable or itable value is stored as vmindex. 273 // This is done eagerly, since it is readily available without 274 // constructing any new objects. 275 return m->method_holder()->add_member_name(mname, intern); 276 } 277 278 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 279 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 280 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 281 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 282 Metadata* vmtarget = fd.field_holder(); 283 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 284 oop mname_oop = mname(); 285 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 286 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 287 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 288 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); 289 oop type = field_signature_type_or_null(fd.signature()); 290 oop name = field_name_or_null(fd.name()); 291 if (name != NULL) 292 java_lang_invoke_MemberName::set_name(mname_oop, name); 293 if (type != NULL) 294 java_lang_invoke_MemberName::set_type(mname_oop, type); 295 // Note: name and type can be lazily computed by resolve_MemberName, 296 // if Java code needs them as resolved String and Class objects. 297 // Note that the incoming type oop might be pre-resolved (non-null). 298 // The base clazz and field offset (vmindex) must be eagerly stored, 299 // because they unambiguously identify the field. 300 // Although the fieldDescriptor::_index would also identify the field, 301 // we do not use it, because it is harder to decode. 302 // TO DO: maybe intern mname_oop 303 return mname(); 304 } 305 306 // JVM 2.9 Special Methods: 307 // A method is signature polymorphic if and only if all of the following conditions hold : 308 // * It is declared in the java.lang.invoke.MethodHandle class. 309 // * It has a single formal parameter of type Object[]. 310 // * It has a return type of Object. 311 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 312 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 313 if (klass == NULL) 314 return false; 315 // The following test will fail spuriously during bootstrap of MethodHandle itself: 316 // if (klass != SystemDictionary::MethodHandle_klass()) 317 // Test the name instead: 318 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle()) 319 return false; 320 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 321 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig); 322 if (m == NULL) return false; 323 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 324 int flags = m->access_flags().as_int(); 325 return (flags & required) == required; 326 } 327 328 329 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 330 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid)); 331 switch (iid) { 332 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 333 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 334 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 335 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 336 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 337 } 338 assert(false, ""); 339 return 0; 340 } 341 342 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 343 switch (iid) { 344 case vmIntrinsics::_invokeBasic: return 0; 345 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 346 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 347 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 348 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 349 } 350 assert(false, err_msg("iid=%d", iid)); 351 return 0; 352 } 353 354 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 355 vmSymbols::SID name_id = vmSymbols::find_sid(name); 356 switch (name_id) { 357 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 358 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 359 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 360 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 361 362 // There is one static signature-polymorphic method for each JVM invocation mode. 363 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 364 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 365 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 366 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 367 } 368 369 // Cover the case of invokeExact and any future variants of invokeFoo. 370 Klass* mh_klass = SystemDictionary::well_known_klass( 371 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 372 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) 373 return vmIntrinsics::_invokeGeneric; 374 375 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 376 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 377 return vmIntrinsics::_none; 378 } 379 380 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 381 if (klass != NULL && 382 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) { 383 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 384 if (iid != vmIntrinsics::_none) 385 return iid; 386 if (is_method_handle_invoke_name(klass, name)) 387 return vmIntrinsics::_invokeGeneric; 388 } 389 return vmIntrinsics::_none; 390 } 391 392 393 // convert the external string or reflective type to an internal signature 394 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 395 if (java_lang_invoke_MethodType::is_instance(type_str)) { 396 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 397 } else if (java_lang_Class::is_instance(type_str)) { 398 return java_lang_Class::as_signature(type_str, false, THREAD); 399 } else if (java_lang_String::is_instance(type_str)) { 400 if (intern_if_not_found) { 401 return java_lang_String::as_symbol(type_str, THREAD); 402 } else { 403 return java_lang_String::as_symbol_or_null(type_str); 404 } 405 } else { 406 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 407 } 408 } 409 410 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 411 enum { OBJ_SIG_LEN = 18 }; 412 413 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 414 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 415 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 416 const int len = sig->utf8_length(); 417 for (int i = 0; i < len; i++) { 418 switch (sig->byte_at(i)) { 419 case 'L': 420 // only java/lang/Object is valid here 421 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 422 return false; 423 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 424 continue; 425 case '(': case ')': case 'V': 426 case 'I': case 'J': case 'F': case 'D': 427 continue; 428 //case '[': 429 //case 'Z': case 'B': case 'C': case 'S': 430 default: 431 return false; 432 } 433 } 434 return true; 435 } 436 437 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 438 Symbol* bsig = NULL; 439 if (sig == NULL) { 440 return sig; 441 } else if (is_basic_type_signature(sig)) { 442 sig->increment_refcount(); 443 return sig; // that was easy 444 } else if (sig->byte_at(0) != '(') { 445 BasicType bt = char2type(sig->byte_at(0)); 446 if (is_subword_type(bt)) { 447 bsig = vmSymbols::int_signature(); 448 } else { 449 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 450 bsig = vmSymbols::object_signature(); 451 } 452 } else { 453 ResourceMark rm; 454 stringStream buffer(128); 455 buffer.put('('); 456 int arg_pos = 0, keep_arg_pos = -1; 457 if (keep_last_arg) 458 keep_arg_pos = ArgumentCount(sig).size() - 1; 459 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 460 BasicType bt = ss.type(); 461 size_t this_arg_pos = buffer.size(); 462 if (ss.at_return_type()) { 463 buffer.put(')'); 464 } 465 if (arg_pos == keep_arg_pos) { 466 buffer.write((char*) ss.raw_bytes(), 467 (int) ss.raw_length()); 468 } else if (bt == T_OBJECT || bt == T_ARRAY) { 469 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 470 } else { 471 if (is_subword_type(bt)) 472 bt = T_INT; 473 buffer.put(type2char(bt)); 474 } 475 arg_pos++; 476 } 477 const char* sigstr = buffer.base(); 478 int siglen = (int) buffer.size(); 479 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 480 } 481 assert(is_basic_type_signature(bsig) || 482 // detune assert in case the injected argument is not a basic type: 483 keep_last_arg, ""); 484 return bsig; 485 } 486 487 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 488 Symbol* sig, 489 bool keep_arrays, 490 bool keep_basic_names) { 491 st = st ? st : tty; 492 int len = sig->utf8_length(); 493 int array = 0; 494 bool prev_type = false; 495 for (int i = 0; i < len; i++) { 496 char ch = sig->byte_at(i); 497 switch (ch) { 498 case '(': case ')': 499 prev_type = false; 500 st->put(ch); 501 continue; 502 case '[': 503 if (!keep_basic_names && keep_arrays) 504 st->put(ch); 505 array++; 506 continue; 507 case 'L': 508 { 509 if (prev_type) st->put(','); 510 int start = i+1, slash = start; 511 while (++i < len && (ch = sig->byte_at(i)) != ';') { 512 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 513 } 514 if (slash < i) start = slash; 515 if (!keep_basic_names) { 516 st->put('L'); 517 } else { 518 for (int j = start; j < i; j++) 519 st->put(sig->byte_at(j)); 520 prev_type = true; 521 } 522 break; 523 } 524 default: 525 { 526 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 527 ch = '['; 528 array = 0; 529 } 530 if (prev_type) st->put(','); 531 const char* n = NULL; 532 if (keep_basic_names) 533 n = type2name(char2type(ch)); 534 if (n == NULL) { 535 // unknown letter, or we don't want to know its name 536 st->put(ch); 537 } else { 538 st->print("%s", n); 539 prev_type = true; 540 } 541 break; 542 } 543 } 544 // Switch break goes here to take care of array suffix: 545 if (prev_type) { 546 while (array > 0) { 547 st->print("[]"); 548 --array; 549 } 550 } 551 array = 0; 552 } 553 } 554 555 556 557 static oop object_java_mirror() { 558 return SystemDictionary::Object_klass()->java_mirror(); 559 } 560 561 oop MethodHandles::field_name_or_null(Symbol* s) { 562 if (s == NULL) return NULL; 563 return StringTable::lookup(s); 564 } 565 566 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 567 if (s == NULL) return NULL; 568 BasicType bt = FieldType::basic_type(s); 569 if (is_java_primitive(bt)) { 570 assert(s->utf8_length() == 1, ""); 571 return java_lang_Class::primitive_mirror(bt); 572 } 573 // Here are some more short cuts for common types. 574 // They are optional, since reference types can be resolved lazily. 575 if (bt == T_OBJECT) { 576 if (s == vmSymbols::object_signature()) { 577 return object_java_mirror(); 578 } else if (s == vmSymbols::class_signature()) { 579 return SystemDictionary::Class_klass()->java_mirror(); 580 } else if (s == vmSymbols::string_signature()) { 581 return SystemDictionary::String_klass()->java_mirror(); 582 } 583 } 584 return NULL; 585 } 586 587 588 // An unresolved member name is a mere symbolic reference. 589 // Resolving it plants a vmtarget/vmindex in it, 590 // which refers directly to JVM internals. 591 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) { 592 Handle empty; 593 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 594 595 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 596 // Already resolved. 597 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 598 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 599 return mname; 600 } 601 602 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 603 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 604 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 605 int flags = java_lang_invoke_MemberName::flags(mname()); 606 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 607 if (!ref_kind_is_valid(ref_kind)) { 608 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 609 } 610 611 DEBUG_ONLY(int old_vmindex); 612 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 613 614 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 615 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 616 } 617 618 instanceKlassHandle defc; 619 { 620 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 621 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 622 if (!defc_klass->oop_is_instance()) { 623 if (!defc_klass->oop_is_array()) return empty; 624 defc_klass = SystemDictionary::Object_klass(); 625 } 626 defc = instanceKlassHandle(THREAD, defc_klass); 627 } 628 if (defc.is_null()) { 629 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 630 } 631 defc->link_class(CHECK_(empty)); // possible safepoint 632 633 // convert the external string name to an internal symbol 634 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 635 if (name == NULL) return empty; // no such name 636 if (name == vmSymbols::class_initializer_name()) 637 return empty; // illegal name 638 639 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 640 if ((flags & ALL_KINDS) == IS_METHOD && 641 (defc() == SystemDictionary::MethodHandle_klass()) && 642 (ref_kind == JVM_REF_invokeVirtual || 643 ref_kind == JVM_REF_invokeSpecial || 644 // static invocation mode is required for _linkToVirtual, etc.: 645 ref_kind == JVM_REF_invokeStatic)) { 646 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 647 if (iid != vmIntrinsics::_none && 648 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 649 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 650 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 651 mh_invoke_id = iid; 652 } 653 } 654 655 // convert the external string or reflective type to an internal signature 656 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 657 if (type == NULL) return empty; // no such signature exists in the VM 658 659 // Time to do the lookup. 660 switch (flags & ALL_KINDS) { 661 case IS_METHOD: 662 { 663 CallInfo result; 664 { 665 assert(!HAS_PENDING_EXCEPTION, ""); 666 if (ref_kind == JVM_REF_invokeStatic) { 667 LinkResolver::resolve_static_call(result, 668 defc, name, type, caller, caller.not_null(), false, THREAD); 669 } else if (ref_kind == JVM_REF_invokeInterface) { 670 LinkResolver::resolve_interface_call(result, Handle(), defc, 671 defc, name, type, caller, caller.not_null(), false, THREAD); 672 } else if (mh_invoke_id != vmIntrinsics::_none) { 673 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 674 LinkResolver::resolve_handle_call(result, 675 defc, name, type, caller, THREAD); 676 } else if (ref_kind == JVM_REF_invokeSpecial) { 677 LinkResolver::resolve_special_call(result, 678 Handle(), defc, name, type, caller, caller.not_null(), THREAD); 679 } else if (ref_kind == JVM_REF_invokeVirtual) { 680 LinkResolver::resolve_virtual_call(result, Handle(), defc, 681 defc, name, type, caller, caller.not_null(), false, THREAD); 682 } else { 683 assert(false, err_msg("ref_kind=%d", ref_kind)); 684 } 685 if (HAS_PENDING_EXCEPTION) { 686 return empty; 687 } 688 } 689 if (result.resolved_appendix().not_null()) { 690 // The resolved MemberName must not be accompanied by an appendix argument, 691 // since there is no way to bind this value into the MemberName. 692 // Caller is responsible to prevent this from happening. 693 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 694 } 695 oop mname2 = init_method_MemberName(mname, result); 696 return Handle(THREAD, mname2); 697 } 698 case IS_CONSTRUCTOR: 699 { 700 CallInfo result; 701 { 702 assert(!HAS_PENDING_EXCEPTION, ""); 703 if (name == vmSymbols::object_initializer_name()) { 704 LinkResolver::resolve_special_call(result, 705 Handle(), defc, name, type, caller, caller.not_null(), THREAD); 706 } else { 707 break; // will throw after end of switch 708 } 709 if (HAS_PENDING_EXCEPTION) { 710 return empty; 711 } 712 } 713 assert(result.is_statically_bound(), ""); 714 oop mname2 = init_method_MemberName(mname, result); 715 return Handle(THREAD, mname2); 716 } 717 case IS_FIELD: 718 { 719 fieldDescriptor result; // find_field initializes fd if found 720 { 721 assert(!HAS_PENDING_EXCEPTION, ""); 722 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD); 723 if (HAS_PENDING_EXCEPTION) { 724 return empty; 725 } 726 } 727 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 728 return Handle(THREAD, mname2); 729 } 730 default: 731 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 732 } 733 734 return empty; 735 } 736 737 // Conversely, a member name which is only initialized from JVM internals 738 // may have null defc, name, and type fields. 739 // Resolving it plants a vmtarget/vmindex in it, 740 // which refers directly to JVM internals. 741 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 742 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 743 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 744 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 745 if (vmtarget == NULL) { 746 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 747 } 748 749 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 750 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 751 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 752 int flags = java_lang_invoke_MemberName::flags(mname()); 753 754 if (suppress != 0) { 755 if (suppress & _suppress_defc) have_defc = true; 756 if (suppress & _suppress_name) have_name = true; 757 if (suppress & _suppress_type) have_type = true; 758 } 759 760 if (have_defc && have_name && have_type) return; // nothing needed 761 762 switch (flags & ALL_KINDS) { 763 case IS_METHOD: 764 case IS_CONSTRUCTOR: 765 { 766 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 767 methodHandle m(THREAD, (Method*)vmtarget); 768 DEBUG_ONLY(vmtarget = NULL); // safety 769 if (m.is_null()) break; 770 if (!have_defc) { 771 InstanceKlass* defc = m->method_holder(); 772 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 773 } 774 if (!have_name) { 775 //not java_lang_String::create_from_symbol; let's intern member names 776 Handle name = StringTable::intern(m->name(), CHECK); 777 java_lang_invoke_MemberName::set_name(mname(), name()); 778 } 779 if (!have_type) { 780 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 781 java_lang_invoke_MemberName::set_type(mname(), type()); 782 } 783 return; 784 } 785 case IS_FIELD: 786 { 787 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 788 if (!((Klass*) vmtarget)->oop_is_instance()) break; 789 instanceKlassHandle defc(THREAD, (Klass*) vmtarget); 790 DEBUG_ONLY(vmtarget = NULL); // safety 791 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 792 fieldDescriptor fd; // find_field initializes fd if found 793 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 794 break; // cannot expand 795 if (!have_defc) { 796 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 797 } 798 if (!have_name) { 799 //not java_lang_String::create_from_symbol; let's intern member names 800 Handle name = StringTable::intern(fd.name(), CHECK); 801 java_lang_invoke_MemberName::set_name(mname(), name()); 802 } 803 if (!have_type) { 804 // If it is a primitive field type, don't mess with short strings like "I". 805 Handle type = field_signature_type_or_null(fd.signature()); 806 if (type.is_null()) { 807 java_lang_String::create_from_symbol(fd.signature(), CHECK); 808 } 809 java_lang_invoke_MemberName::set_type(mname(), type()); 810 } 811 return; 812 } 813 } 814 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 815 } 816 817 int MethodHandles::find_MemberNames(KlassHandle k, 818 Symbol* name, Symbol* sig, 819 int mflags, KlassHandle caller, 820 int skip, objArrayHandle results) { 821 // %%% take caller into account! 822 823 Thread* thread = Thread::current(); 824 825 if (k.is_null() || !k->oop_is_instance()) return -1; 826 827 int rfill = 0, rlimit = results->length(), rskip = skip; 828 // overflow measurement: 829 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 830 831 int match_flags = mflags; 832 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 833 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 834 bool local_only = !(search_superc | search_intfc); 835 bool classes_only = false; 836 837 if (name != NULL) { 838 if (name->utf8_length() == 0) return 0; // a match is not possible 839 } 840 if (sig != NULL) { 841 if (sig->utf8_length() == 0) return 0; // a match is not possible 842 if (sig->byte_at(0) == '(') 843 match_flags &= ~(IS_FIELD | IS_TYPE); 844 else 845 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 846 } 847 848 if ((match_flags & IS_TYPE) != 0) { 849 // NYI, and Core Reflection works quite well for this query 850 } 851 852 if ((match_flags & IS_FIELD) != 0) { 853 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 854 if (name != NULL && st.name() != name) 855 continue; 856 if (sig != NULL && st.signature() != sig) 857 continue; 858 // passed the filters 859 if (rskip > 0) { 860 --rskip; 861 } else if (rfill < rlimit) { 862 Handle result(thread, results->obj_at(rfill++)); 863 if (!java_lang_invoke_MemberName::is_instance(result())) 864 return -99; // caller bug! 865 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 866 if (saved != result()) 867 results->obj_at_put(rfill-1, saved); // show saved instance to user 868 } else if (++overflow >= overflow_limit) { 869 match_flags = 0; break; // got tired of looking at overflow 870 } 871 } 872 } 873 874 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 875 // watch out for these guys: 876 Symbol* init_name = vmSymbols::object_initializer_name(); 877 Symbol* clinit_name = vmSymbols::class_initializer_name(); 878 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 879 bool negate_name_test = false; 880 // fix name so that it captures the intention of IS_CONSTRUCTOR 881 if (!(match_flags & IS_METHOD)) { 882 // constructors only 883 if (name == NULL) { 884 name = init_name; 885 } else if (name != init_name) { 886 return 0; // no constructors of this method name 887 } 888 } else if (!(match_flags & IS_CONSTRUCTOR)) { 889 // methods only 890 if (name == NULL) { 891 name = init_name; 892 negate_name_test = true; // if we see the name, we *omit* the entry 893 } else if (name == init_name) { 894 return 0; // no methods of this constructor name 895 } 896 } else { 897 // caller will accept either sort; no need to adjust name 898 } 899 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 900 Method* m = st.method(); 901 Symbol* m_name = m->name(); 902 if (m_name == clinit_name) 903 continue; 904 if (name != NULL && ((m_name != name) ^ negate_name_test)) 905 continue; 906 if (sig != NULL && m->signature() != sig) 907 continue; 908 // passed the filters 909 if (rskip > 0) { 910 --rskip; 911 } else if (rfill < rlimit) { 912 Handle result(thread, results->obj_at(rfill++)); 913 if (!java_lang_invoke_MemberName::is_instance(result())) 914 return -99; // caller bug! 915 CallInfo info(m); 916 // Since this is going through the methods to create MemberNames, don't search 917 // for matching methods already in the table 918 oop saved = MethodHandles::init_method_MemberName(result, info, /*intern*/false); 919 if (saved != result()) 920 results->obj_at_put(rfill-1, saved); // show saved instance to user 921 } else if (++overflow >= overflow_limit) { 922 match_flags = 0; break; // got tired of looking at overflow 923 } 924 } 925 } 926 927 // return number of elements we at leasted wanted to initialize 928 return rfill + overflow; 929 } 930 931 //------------------------------------------------------------------------------ 932 // MemberNameTable 933 // 934 935 MemberNameTable::MemberNameTable(int methods_cnt) 936 : GrowableArray<jweak>(methods_cnt, true) { 937 assert_locked_or_safepoint(MemberNameTable_lock); 938 } 939 940 MemberNameTable::~MemberNameTable() { 941 assert_locked_or_safepoint(MemberNameTable_lock); 942 int len = this->length(); 943 944 for (int idx = 0; idx < len; idx++) { 945 jweak ref = this->at(idx); 946 JNIHandles::destroy_weak_global(ref); 947 } 948 } 949 950 oop MemberNameTable::add_member_name(jweak mem_name_wref) { 951 assert_locked_or_safepoint(MemberNameTable_lock); 952 this->push(mem_name_wref); 953 return JNIHandles::resolve(mem_name_wref); 954 } 955 956 oop MemberNameTable::find_or_add_member_name(jweak mem_name_wref) { 957 assert_locked_or_safepoint(MemberNameTable_lock); 958 oop new_mem_name = JNIHandles::resolve(mem_name_wref); 959 960 // Find matching member name in the list. 961 // This is linear because these are short lists. 962 int len = this->length(); 963 int new_index = len; 964 for (int idx = 0; idx < len; idx++) { 965 oop mname = JNIHandles::resolve(this->at(idx)); 966 if (mname == NULL) { 967 new_index = idx; 968 continue; 969 } 970 if (java_lang_invoke_MemberName::equals(new_mem_name, mname)) { 971 JNIHandles::destroy_weak_global(mem_name_wref); 972 return mname; 973 } 974 } 975 976 if (new_index < len) { 977 assert(JNIHandles::resolve(this->at(new_index)) == NULL, "sanity"); 978 // destory the old handle 979 JNIHandles::destroy_weak_global(this->at(new_index)); 980 } 981 982 // Not found, push the new one, or reuse empty slot 983 this->at_put_grow(new_index, mem_name_wref); 984 return new_mem_name; 985 } 986 987 #if INCLUDE_JVMTI 988 // It is called at safepoint only for RedefineClasses 989 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) { 990 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 991 // For each redefined method 992 for (int idx = 0; idx < length(); idx++) { 993 oop mem_name = JNIHandles::resolve(this->at(idx)); 994 if (mem_name == NULL) { 995 continue; 996 } 997 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); 998 999 if (old_method == NULL || !old_method->is_old()) { 1000 continue; // skip uninteresting entries 1001 } 1002 if (old_method->is_deleted()) { 1003 // skip entries with deleted methods 1004 continue; 1005 } 1006 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); 1007 1008 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 1009 assert(old_method != new_method, "sanity check"); 1010 1011 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method); 1012 1013 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 1014 if (!(*trace_name_printed)) { 1015 // RC_TRACE_MESG macro has an embedded ResourceMark 1016 RC_TRACE_MESG(("adjust: name=%s", 1017 old_method->method_holder()->external_name())); 1018 *trace_name_printed = true; 1019 } 1020 // RC_TRACE macro has an embedded ResourceMark 1021 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)", 1022 new_method->name()->as_C_string(), 1023 new_method->signature()->as_C_string())); 1024 } 1025 } 1026 } 1027 #endif // INCLUDE_JVMTI 1028 1029 // 1030 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1031 // They are the private interface between this JVM and the HotSpot-specific 1032 // Java code that implements JSR 292 method handles. 1033 // 1034 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1035 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1036 // 1037 1038 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) { 1039 switch (which) { 1040 case MethodHandles::GC_COUNT_GWT: 1041 #ifdef COMPILER2 1042 return true; 1043 #else 1044 return false; 1045 #endif 1046 } 1047 return 0; 1048 } 1049 JVM_END 1050 1051 #ifndef PRODUCT 1052 #define EACH_NAMED_CON(template, requirement) \ 1053 template(MethodHandles,GC_COUNT_GWT) \ 1054 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1055 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1056 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1057 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1058 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1059 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1060 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1061 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1062 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1063 template(MethodHandles,GC_LAMBDA_SUPPORT) \ 1064 /*end*/ 1065 1066 #define IGNORE_REQ(req_expr) /* req_expr */ 1067 #define ONE_PLUS(scope,value) 1+ 1068 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1069 #define VALUE_COMMA(scope,value) scope::value, 1070 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1071 #define STRING_NULL(scope,value) #value "\0" 1072 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1073 1074 static bool advertise_con_value(int which) { 1075 if (which < 0) return false; 1076 bool ok = true; 1077 int count = 0; 1078 #define INC_COUNT(scope,value) \ 1079 ++count; 1080 #define CHECK_REQ(req_expr) \ 1081 if (which < count) return ok; \ 1082 ok = (req_expr); 1083 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1084 #undef INC_COUNT 1085 #undef CHECK_REQ 1086 assert(count == con_value_count, ""); 1087 if (which < count) return ok; 1088 return false; 1089 } 1090 1091 #undef ONE_PLUS 1092 #undef VALUE_COMMA 1093 #undef STRING_NULL 1094 #undef EACH_NAMED_CON 1095 #endif // PRODUCT 1096 1097 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1098 #ifndef PRODUCT 1099 if (advertise_con_value(which)) { 1100 assert(which >= 0 && which < con_value_count, ""); 1101 int con = con_values[which]; 1102 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1103 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1104 const char* str = &con_names[0]; 1105 for (int i = 0; i < which; i++) 1106 str += strlen(str) + 1; // skip name and null 1107 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1108 box->obj_at_put(0, name); 1109 } 1110 return con; 1111 } 1112 #endif 1113 return 0; 1114 } 1115 JVM_END 1116 1117 // void init(MemberName self, AccessibleObject ref) 1118 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1119 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1120 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1121 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1122 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1123 MethodHandles::init_MemberName(mname, target); 1124 } 1125 JVM_END 1126 1127 // void expand(MemberName self) 1128 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1129 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1130 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1131 MethodHandles::expand_MemberName(mname, 0, CHECK); 1132 } 1133 JVM_END 1134 1135 // void resolve(MemberName self, Class<?> caller) 1136 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1137 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1138 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1139 1140 // The trusted Java code that calls this method should already have performed 1141 // access checks on behalf of the given caller. But, we can verify this. 1142 if (VerifyMethodHandles && caller_jh != NULL && 1143 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1144 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1145 if (reference_klass != NULL && reference_klass->oop_is_objArray()) { 1146 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1147 } 1148 1149 // Reflection::verify_class_access can only handle instance classes. 1150 if (reference_klass != NULL && reference_klass->oop_is_instance()) { 1151 // Emulate LinkResolver::check_klass_accessability. 1152 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1153 if (!Reflection::verify_class_access(caller, 1154 reference_klass, 1155 true)) { 1156 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1157 } 1158 } 1159 } 1160 1161 KlassHandle caller(THREAD, 1162 caller_jh == NULL ? (Klass*) NULL : 1163 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh))); 1164 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1165 1166 if (resolved.is_null()) { 1167 int flags = java_lang_invoke_MemberName::flags(mname()); 1168 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1169 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1170 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1171 } 1172 if ((flags & ALL_KINDS) == IS_FIELD) { 1173 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); 1174 } else if ((flags & ALL_KINDS) == IS_METHOD || 1175 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1176 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); 1177 } else { 1178 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1179 } 1180 } 1181 1182 return JNIHandles::make_local(THREAD, resolved()); 1183 } 1184 JVM_END 1185 1186 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1187 if (mname == NULL || 1188 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1189 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1190 } else { 1191 int flags = java_lang_invoke_MemberName::flags(mname); 1192 if ((flags & IS_FIELD) != 0 && 1193 (must_be_static 1194 ? (flags & JVM_ACC_STATIC) != 0 1195 : (flags & JVM_ACC_STATIC) == 0)) { 1196 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1197 return (jlong) vmindex; 1198 } 1199 } 1200 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1201 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1202 return 0; 1203 } 1204 1205 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1206 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1207 } 1208 JVM_END 1209 1210 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1211 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1212 } 1213 JVM_END 1214 1215 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1216 // use the other function to perform sanity checks: 1217 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1218 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1219 return JNIHandles::make_local(THREAD, clazz); 1220 } 1221 JVM_END 1222 1223 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1224 if (mname_jh == NULL) return NULL; 1225 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1226 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1227 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1228 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1229 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1230 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1231 result->obj_at_put(0, x); 1232 x = NULL; 1233 if (vmtarget == NULL) { 1234 x = NULL; 1235 } else if (vmtarget->is_klass()) { 1236 x = ((Klass*) vmtarget)->java_mirror(); 1237 } else if (vmtarget->is_method()) { 1238 x = mname(); 1239 } 1240 result->obj_at_put(1, x); 1241 return JNIHandles::make_local(env, result()); 1242 } 1243 JVM_END 1244 1245 1246 1247 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1248 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1249 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1250 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1251 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1252 if (clazz_jh == NULL || results_jh == NULL) return -1; 1253 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); 1254 1255 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1256 if (results.is_null() || !results->is_objArray()) return -1; 1257 1258 TempNewSymbol name = NULL; 1259 TempNewSymbol sig = NULL; 1260 if (name_jh != NULL) { 1261 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1262 if (name == NULL) return 0; // a match is not possible 1263 } 1264 if (sig_jh != NULL) { 1265 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1266 if (sig == NULL) return 0; // a match is not possible 1267 } 1268 1269 KlassHandle caller; 1270 if (caller_jh != NULL) { 1271 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1272 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1273 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); 1274 } 1275 1276 if (name != NULL && sig != NULL && results.not_null()) { 1277 // try a direct resolve 1278 // %%% TO DO 1279 } 1280 1281 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1282 caller, skip, results); 1283 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1284 return res; 1285 } 1286 JVM_END 1287 1288 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1289 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1290 Handle target (THREAD, JNIHandles::resolve(target_jh)); 1291 { 1292 // Walk all nmethods depending on this call site. 1293 MutexLocker mu(Compile_lock, thread); 1294 Universe::flush_dependents_on(call_site, target); 1295 java_lang_invoke_CallSite::set_target(call_site(), target()); 1296 } 1297 } 1298 JVM_END 1299 1300 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1301 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1302 Handle target (THREAD, JNIHandles::resolve(target_jh)); 1303 { 1304 // Walk all nmethods depending on this call site. 1305 MutexLocker mu(Compile_lock, thread); 1306 Universe::flush_dependents_on(call_site, target); 1307 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1308 } 1309 } 1310 JVM_END 1311 1312 /** 1313 * Throws a java/lang/UnsupportedOperationException unconditionally. 1314 * This is required by the specification of MethodHandle.invoke if 1315 * invoked directly. 1316 */ 1317 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1318 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1319 return NULL; 1320 } 1321 JVM_END 1322 1323 /** 1324 * Throws a java/lang/UnsupportedOperationException unconditionally. 1325 * This is required by the specification of MethodHandle.invokeExact if 1326 * invoked directly. 1327 */ 1328 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1329 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1330 return NULL; 1331 } 1332 JVM_END 1333 1334 /// JVM_RegisterMethodHandleMethods 1335 1336 #undef CS // Solaris builds complain 1337 1338 #define LANG "Ljava/lang/" 1339 #define JLINV "Ljava/lang/invoke/" 1340 1341 #define OBJ LANG "Object;" 1342 #define CLS LANG "Class;" 1343 #define STRG LANG "String;" 1344 #define CS JLINV "CallSite;" 1345 #define MT JLINV "MethodType;" 1346 #define MH JLINV "MethodHandle;" 1347 #define MEM JLINV "MemberName;" 1348 1349 #define CC (char*) /*cast a literal from (const char*)*/ 1350 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1351 1352 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1353 static JNINativeMethod MHN_methods[] = { 1354 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1355 {CC"expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1356 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)}, 1357 {CC "getConstant", CC "(I)I", FN_PTR(MHN_getConstant)}, 1358 // static native int getNamedCon(int which, Object[] name) 1359 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1360 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1361 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1362 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1363 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1364 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1365 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1366 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1367 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1368 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1369 }; 1370 1371 static JNINativeMethod MH_methods[] = { 1372 // UnsupportedOperationException throwers 1373 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1374 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1375 }; 1376 1377 /** 1378 * Helper method to register native methods. 1379 */ 1380 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1381 int status = env->RegisterNatives(clazz, methods, nMethods); 1382 if (status != JNI_OK || env->ExceptionOccurred()) { 1383 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 1384 env->ExceptionClear(); 1385 return false; 1386 } 1387 return true; 1388 } 1389 1390 /** 1391 * This one function is exported, used by NativeLookup. 1392 */ 1393 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1394 if (!EnableInvokeDynamic) { 1395 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable."); 1396 return; // bind nothing 1397 } 1398 1399 assert(!MethodHandles::enabled(), "must not be enabled"); 1400 bool enable_MH = true; 1401 1402 jclass MH_class = NULL; 1403 if (SystemDictionary::MethodHandle_klass() == NULL) { 1404 enable_MH = false; 1405 } else { 1406 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1407 MH_class = (jclass) JNIHandles::make_local(env, mirror); 1408 } 1409 1410 if (enable_MH) { 1411 ThreadToNativeFromVM ttnfv(thread); 1412 1413 if (enable_MH) { 1414 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1415 } 1416 if (enable_MH) { 1417 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1418 } 1419 } 1420 1421 if (TraceInvokeDynamic) { 1422 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1423 } 1424 1425 if (enable_MH) { 1426 MethodHandles::generate_adapters(); 1427 MethodHandles::set_enabled(true); 1428 } 1429 } 1430 JVM_END