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/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/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 (!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, "CodeCache: no room for MethodHandles adapters"); 71 { 72 CodeBuffer code(_adapter_code); 73 MethodHandlesAdapterGenerator g(&code); 74 g.generate(); 75 code.log_section_sizes("MethodHandlesAdapterBlob"); 76 } 77 } 78 79 //------------------------------------------------------------------------------ 80 // MethodHandlesAdapterGenerator::generate 81 // 82 void MethodHandlesAdapterGenerator::generate() { 83 // Generate generic method handle adapters. 84 // Generate interpreter entries 85 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 86 mk <= Interpreter::method_handle_invoke_LAST; 87 mk = Interpreter::MethodKind(1 + (int)mk)) { 88 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 89 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 90 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 91 if (entry != NULL) { 92 Interpreter::set_entry_for_kind(mk, entry); 93 } 94 // If the entry is not set, it will throw AbstractMethodError. 95 } 96 } 97 98 void MethodHandles::set_enabled(bool z) { 99 if (_enabled != z) { 100 guarantee(z && EnableInvokeDynamic, "can only enable once, and only if -XX:+EnableInvokeDynamic"); 101 _enabled = z; 102 } 103 } 104 105 // MemberName support 106 107 // import java_lang_invoke_MemberName.* 108 enum { 109 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 110 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 111 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 112 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 113 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 114 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 115 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 116 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 117 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 118 }; 119 120 Handle MethodHandles::new_MemberName(TRAPS) { 121 Handle empty; 122 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 123 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 124 return Handle(THREAD, k->allocate_instance(THREAD)); 125 } 126 127 oop MethodHandles::init_MemberName(Handle mname, Handle target) { 128 Thread* thread = Thread::current(); 129 oop target_oop = target(); 130 klassOop target_klass = target_oop->klass(); 131 if (target_klass == SystemDictionary::reflect_Field_klass()) { 132 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 133 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 134 int mods = java_lang_reflect_Field::modifiers(target_oop); 135 oop type = java_lang_reflect_Field::type(target_oop); 136 oop name = java_lang_reflect_Field::name(target_oop); 137 KlassHandle k(thread, java_lang_Class::as_klassOop(clazz)); 138 intptr_t offset = instanceKlass::cast(k())->field_offset(slot); 139 return init_field_MemberName(mname, k, accessFlags_from(mods), type, name, offset); 140 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 141 oop clazz = java_lang_reflect_Method::clazz(target_oop); 142 int slot = java_lang_reflect_Method::slot(target_oop); 143 KlassHandle k(thread, java_lang_Class::as_klassOop(clazz)); 144 if (!k.is_null() && k->oop_is_instance()) { 145 methodOop m = instanceKlass::cast(k())->method_with_idnum(slot); 146 return init_method_MemberName(mname, m, true, k); 147 } 148 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 149 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 150 int slot = java_lang_reflect_Constructor::slot(target_oop); 151 KlassHandle k(thread, java_lang_Class::as_klassOop(clazz)); 152 if (!k.is_null() && k->oop_is_instance()) { 153 methodOop m = instanceKlass::cast(k())->method_with_idnum(slot); 154 return init_method_MemberName(mname, m, false, k); 155 } 156 } else if (target_klass == SystemDictionary::MemberName_klass()) { 157 // Note: This only works if the MemberName has already been resolved. 158 oop clazz = java_lang_invoke_MemberName::clazz(target_oop); 159 int flags = java_lang_invoke_MemberName::flags(target_oop); 160 oop vmtarget = java_lang_invoke_MemberName::vmtarget(target_oop); 161 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(target_oop); 162 KlassHandle k(thread, java_lang_Class::as_klassOop(clazz)); 163 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 164 if (vmtarget == NULL) return NULL; // not resolved 165 if ((flags & IS_FIELD) != 0) { 166 assert(vmtarget->is_klass(), "field vmtarget is klassOop"); 167 int basic_mods = (ref_kind_is_static(ref_kind) ? JVM_ACC_STATIC : 0); 168 // FIXME: how does k (receiver_limit) contribute? 169 KlassHandle k_vmtarget(thread, klassOop(vmtarget)); 170 return init_field_MemberName(mname, k_vmtarget, accessFlags_from(basic_mods), NULL, NULL, vmindex); 171 } else if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 172 assert(vmtarget->is_method(), "method or constructor vmtarget is methodOop"); 173 return init_method_MemberName(mname, methodOop(vmtarget), ref_kind_does_dispatch(ref_kind), k); 174 } else { 175 return NULL; 176 } 177 } 178 return NULL; 179 } 180 181 oop MethodHandles::init_method_MemberName(Handle mname, methodOop m, bool do_dispatch, 182 KlassHandle resolved_klass_h) { 183 klassOop resolved_klass = resolved_klass_h(); 184 AccessFlags mods = m->access_flags(); 185 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 186 int vmindex = methodOopDesc::nonvirtual_vtable_index; // implies never any dispatch 187 bool is_itable_call = false; 188 klassOop m_klass = m->method_holder(); 189 // resolved_klass is a copy of CallInfo::resolved_klass, if available 190 if (resolved_klass == NULL) 191 resolved_klass = m_klass; 192 if (m->is_initializer()) { 193 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 194 } else if (mods.is_static()) { 195 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 196 } else if (resolved_klass != m_klass && 197 !Klass::cast(resolved_klass)->is_subtype_of(m_klass)) { 198 return NULL; // bad receiver limit 199 } else if (Klass::cast(resolved_klass)->is_interface() && 200 Klass::cast(m_klass)->is_interface()) { 201 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 202 vmindex = klassItable::compute_itable_index(m); 203 is_itable_call = true; 204 } else if (m_klass != resolved_klass && Klass::cast(m_klass)->is_interface()) { 205 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 206 // it is a miranda method, so m->vtable_index is not what we want 207 ResourceMark rm; 208 klassVtable* vt = instanceKlass::cast(resolved_klass)->vtable(); 209 vmindex = vt->index_of_miranda(m->name(), m->signature()); 210 } else if (!do_dispatch || m->can_be_statically_bound()) { 211 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 212 } else { 213 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 214 vmindex = m->vtable_index(); 215 } 216 217 if (vmindex >= 0 && !is_itable_call) { 218 if (Klass::cast(m_klass)->is_interface()) { 219 // This is a vtable call to an interface method (abstract "miranda method"). 220 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 221 // (LinkResolver should help us figure this out.) 222 KlassHandle m_klass_non_interface = resolved_klass; 223 if (m_klass_non_interface->is_interface()) { 224 m_klass_non_interface = SystemDictionary::Object_klass(); 225 #ifdef ASSERT 226 { ResourceMark rm; 227 methodOop m2 = m_klass_non_interface->vtable()->method_at(vmindex); 228 assert(m->name() == m2->name() && m->signature() == m2->signature(), 229 err_msg("at %d, %s != %s", vmindex, 230 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string())); 231 } 232 #endif //ASSERT 233 } 234 if (!m->is_public()) { 235 assert(m->is_public(), "virtual call must be to public interface method"); 236 return NULL; // elicit an error later in product build 237 } 238 assert(Klass::cast(resolved_klass)->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe"); 239 m_klass = m_klass_non_interface(); 240 } 241 } 242 243 oop mname_oop = mname(); 244 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 245 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m); 246 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index 247 java_lang_invoke_MemberName::set_clazz(mname_oop, Klass::cast(m_klass)->java_mirror()); 248 // Note: name and type can be lazily computed by resolve_MemberName, 249 // if Java code needs them as resolved String and MethodType objects. 250 // The clazz must be eagerly stored, because it provides a GC 251 // root to help keep alive the methodOop. 252 // If relevant, the vtable or itable value is stored as vmindex. 253 // This is done eagerly, since it is readily available without 254 // constructing any new objects. 255 instanceKlass::cast(m->method_holder())->add_member_name(m->method_idnum(), mname); 256 257 return mname(); 258 } 259 260 Handle MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, TRAPS) { 261 Handle empty; 262 if (info.resolved_appendix().not_null()) { 263 // The resolved MemberName must not be accompanied by an appendix argument, 264 // since there is no way to bind this value into the MemberName. 265 // Caller is responsible to prevent this from happening. 266 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 267 } 268 methodHandle m = info.resolved_method(); 269 KlassHandle defc = info.resolved_klass(); 270 int vmindex = -1; 271 if (defc->is_interface() && Klass::cast(m->method_holder())->is_interface()) { 272 // LinkResolver does not report itable indexes! (fix this?) 273 vmindex = klassItable::compute_itable_index(m()); 274 } else if (m->can_be_statically_bound()) { 275 // LinkResolver reports vtable index even for final methods! 276 vmindex = methodOopDesc::nonvirtual_vtable_index; 277 } else { 278 vmindex = info.vtable_index(); 279 } 280 oop res = init_method_MemberName(mname, m(), (vmindex >= 0), defc()); 281 assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), ""); 282 return Handle(THREAD, res); 283 } 284 285 oop MethodHandles::init_field_MemberName(Handle mname, KlassHandle field_holder, 286 AccessFlags mods, oop type, oop name, 287 intptr_t offset, bool is_setter) { 288 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 289 flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 290 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 291 oop vmtarget = field_holder(); 292 int vmindex = offset; // determines the field uniquely when combined with static bit 293 oop mname_oop = mname(); 294 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 295 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 296 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 297 java_lang_invoke_MemberName::set_clazz(mname_oop, field_holder()->java_mirror()); 298 if (name != NULL) 299 java_lang_invoke_MemberName::set_name(mname_oop, name); 300 if (type != NULL) 301 java_lang_invoke_MemberName::set_type(mname_oop, type); 302 // Note: name and type can be lazily computed by resolve_MemberName, 303 // if Java code needs them as resolved String and Class objects. 304 // Note that the incoming type oop might be pre-resolved (non-null). 305 // The base clazz and field offset (vmindex) must be eagerly stored, 306 // because they unambiguously identify the field. 307 // Although the fieldDescriptor::_index would also identify the field, 308 // we do not use it, because it is harder to decode. 309 return mname(); 310 } 311 312 Handle MethodHandles::init_field_MemberName(Handle mname, FieldAccessInfo& info, TRAPS) { 313 return Handle(); 314 #if 0 315 KlassHandle field_holder = info.klass(); 316 intptr_t field_offset = info.field_offset(); 317 return init_field_MemberName(mname_oop, field_holder(), 318 info.access_flags(), 319 type, name, 320 field_offset, false /*is_setter*/); 321 #endif 322 } 323 324 325 // JVM 2.9 Special Methods: 326 // A method is signature polymorphic if and only if all of the following conditions hold : 327 // * It is declared in the java.lang.invoke.MethodHandle class. 328 // * It has a single formal parameter of type Object[]. 329 // * It has a return type of Object. 330 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 331 bool MethodHandles::is_method_handle_invoke_name(klassOop klass, Symbol* name) { 332 if (klass == NULL) 333 return false; 334 // The following test will fail spuriously during bootstrap of MethodHandle itself: 335 // if (klass != SystemDictionary::MethodHandle_klass()) 336 // Test the name instead: 337 if (Klass::cast(klass)->name() != vmSymbols::java_lang_invoke_MethodHandle()) 338 return false; 339 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 340 methodOop m = instanceKlass::cast(klass)->find_method(name, poly_sig); 341 if (m == NULL) return false; 342 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 343 int flags = m->access_flags().as_int(); 344 return (flags & required) == required; 345 } 346 347 348 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 349 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid)); 350 switch (iid) { 351 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 352 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 353 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 354 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 355 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 356 } 357 assert(false, ""); 358 return 0; 359 } 360 361 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 362 switch (iid) { 363 case vmIntrinsics::_invokeBasic: return 0; 364 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 365 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 366 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 367 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 368 } 369 assert(false, err_msg("iid=%d", iid)); 370 return 0; 371 } 372 373 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 374 vmSymbols::SID name_id = vmSymbols::find_sid(name); 375 switch (name_id) { 376 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 377 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 378 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 379 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 380 381 // There is one static signature-polymorphic method for each JVM invocation mode. 382 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 383 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 384 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 385 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 386 } 387 388 // Cover the case of invokeExact and any future variants of invokeFoo. 389 klassOop mh_klass = SystemDictionary::well_known_klass( 390 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 391 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) 392 return vmIntrinsics::_invokeGeneric; 393 394 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 395 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 396 return vmIntrinsics::_none; 397 } 398 399 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(klassOop klass, Symbol* name) { 400 if (klass != NULL && 401 Klass::cast(klass)->name() == vmSymbols::java_lang_invoke_MethodHandle()) { 402 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 403 if (iid != vmIntrinsics::_none) 404 return iid; 405 if (is_method_handle_invoke_name(klass, name)) 406 return vmIntrinsics::_invokeGeneric; 407 } 408 return vmIntrinsics::_none; 409 } 410 411 412 // convert the external string or reflective type to an internal signature 413 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 414 if (java_lang_invoke_MethodType::is_instance(type_str)) { 415 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL); 416 } else if (java_lang_Class::is_instance(type_str)) { 417 return java_lang_Class::as_signature(type_str, false, CHECK_NULL); 418 } else if (java_lang_String::is_instance(type_str)) { 419 if (intern_if_not_found) { 420 return java_lang_String::as_symbol(type_str, CHECK_NULL); 421 } else { 422 return java_lang_String::as_symbol_or_null(type_str); 423 } 424 } else { 425 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 426 } 427 } 428 429 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 430 enum { OBJ_SIG_LEN = 18 }; 431 432 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 433 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 434 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 435 const int len = sig->utf8_length(); 436 for (int i = 0; i < len; i++) { 437 switch (sig->byte_at(i)) { 438 case 'L': 439 // only java/lang/Object is valid here 440 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 441 return false; 442 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 443 continue; 444 case '(': case ')': case 'V': 445 case 'I': case 'J': case 'F': case 'D': 446 continue; 447 //case '[': 448 //case 'Z': case 'B': case 'C': case 'S': 449 default: 450 return false; 451 } 452 } 453 return true; 454 } 455 456 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 457 Symbol* bsig = NULL; 458 if (sig == NULL) { 459 return sig; 460 } else if (is_basic_type_signature(sig)) { 461 sig->increment_refcount(); 462 return sig; // that was easy 463 } else if (sig->byte_at(0) != '(') { 464 BasicType bt = char2type(sig->byte_at(0)); 465 if (is_subword_type(bt)) { 466 bsig = vmSymbols::int_signature(); 467 } else { 468 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 469 bsig = vmSymbols::object_signature(); 470 } 471 } else { 472 ResourceMark rm; 473 stringStream buffer(128); 474 buffer.put('('); 475 int arg_pos = 0, keep_arg_pos = -1; 476 if (keep_last_arg) 477 keep_arg_pos = ArgumentCount(sig).size() - 1; 478 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 479 BasicType bt = ss.type(); 480 size_t this_arg_pos = buffer.size(); 481 if (ss.at_return_type()) { 482 buffer.put(')'); 483 } 484 if (arg_pos == keep_arg_pos) { 485 buffer.write((char*) ss.raw_bytes(), 486 (int) ss.raw_length()); 487 } else if (bt == T_OBJECT || bt == T_ARRAY) { 488 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 489 } else { 490 if (is_subword_type(bt)) 491 bt = T_INT; 492 buffer.put(type2char(bt)); 493 } 494 arg_pos++; 495 } 496 const char* sigstr = buffer.base(); 497 int siglen = (int) buffer.size(); 498 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 499 } 500 assert(is_basic_type_signature(bsig) || 501 // detune assert in case the injected argument is not a basic type: 502 keep_last_arg, ""); 503 return bsig; 504 } 505 506 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 507 Symbol* sig, 508 bool keep_arrays, 509 bool keep_basic_names) { 510 st = st ? st : tty; 511 int len = sig->utf8_length(); 512 int array = 0; 513 bool prev_type = false; 514 for (int i = 0; i < len; i++) { 515 char ch = sig->byte_at(i); 516 switch (ch) { 517 case '(': case ')': 518 prev_type = false; 519 st->put(ch); 520 continue; 521 case '[': 522 if (!keep_basic_names && keep_arrays) 523 st->put(ch); 524 array++; 525 continue; 526 case 'L': 527 { 528 if (prev_type) st->put(','); 529 int start = i+1, slash = start; 530 while (++i < len && (ch = sig->byte_at(i)) != ';') { 531 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 532 } 533 if (slash < i) start = slash; 534 if (!keep_basic_names) { 535 st->put('L'); 536 } else { 537 for (int j = start; j < i; j++) 538 st->put(sig->byte_at(j)); 539 prev_type = true; 540 } 541 break; 542 } 543 default: 544 { 545 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 546 ch = '['; 547 array = 0; 548 } 549 if (prev_type) st->put(','); 550 const char* n = NULL; 551 if (keep_basic_names) 552 n = type2name(char2type(ch)); 553 if (n == NULL) { 554 // unknown letter, or we don't want to know its name 555 st->put(ch); 556 } else { 557 st->print(n); 558 prev_type = true; 559 } 560 break; 561 } 562 } 563 // Switch break goes here to take care of array suffix: 564 if (prev_type) { 565 while (array > 0) { 566 st->print("[]"); 567 --array; 568 } 569 } 570 array = 0; 571 } 572 } 573 574 575 576 static oop object_java_mirror() { 577 return Klass::cast(SystemDictionary::Object_klass())->java_mirror(); 578 } 579 580 static oop field_name_or_null(Symbol* s) { 581 if (s == NULL) return NULL; 582 return StringTable::lookup(s); 583 } 584 585 static oop field_signature_type_or_null(Symbol* s) { 586 if (s == NULL) return NULL; 587 BasicType bt = FieldType::basic_type(s); 588 if (is_java_primitive(bt)) { 589 assert(s->utf8_length() == 1, ""); 590 return java_lang_Class::primitive_mirror(bt); 591 } 592 // Here are some more short cuts for common types. 593 // They are optional, since reference types can be resolved lazily. 594 if (bt == T_OBJECT) { 595 if (s == vmSymbols::object_signature()) { 596 return object_java_mirror(); 597 } else if (s == vmSymbols::class_signature()) { 598 return Klass::cast(SystemDictionary::Class_klass())->java_mirror(); 599 } else if (s == vmSymbols::string_signature()) { 600 return Klass::cast(SystemDictionary::String_klass())->java_mirror(); 601 } 602 } 603 return NULL; 604 } 605 606 // An unresolved member name is a mere symbolic reference. 607 // Resolving it plants a vmtarget/vmindex in it, 608 // which refers dirctly to JVM internals. 609 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) { 610 Handle empty; 611 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 612 613 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 614 // Already resolved. 615 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 616 assert(vmindex >= methodOopDesc::nonvirtual_vtable_index, ""); 617 return mname; 618 } 619 620 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 621 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 622 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 623 int flags = java_lang_invoke_MemberName::flags(mname()); 624 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 625 if (!ref_kind_is_valid(ref_kind)) { 626 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 627 } 628 629 DEBUG_ONLY(int old_vmindex); 630 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 631 632 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 633 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 634 } 635 636 instanceKlassHandle defc; 637 { 638 klassOop defc_klassOop = java_lang_Class::as_klassOop(defc_oop()); 639 if (defc_klassOop == NULL) return empty; // a primitive; no resolution possible 640 if (!Klass::cast(defc_klassOop)->oop_is_instance()) { 641 if (!Klass::cast(defc_klassOop)->oop_is_array()) return empty; 642 defc_klassOop = SystemDictionary::Object_klass(); 643 } 644 defc = instanceKlassHandle(THREAD, defc_klassOop); 645 } 646 if (defc.is_null()) { 647 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 648 } 649 defc->link_class(CHECK_(empty)); // possible safepoint 650 651 // convert the external string name to an internal symbol 652 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 653 if (name == NULL) return empty; // no such name 654 if (name == vmSymbols::class_initializer_name()) 655 return empty; // illegal name 656 657 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 658 if ((flags & ALL_KINDS) == IS_METHOD && 659 (defc() == SystemDictionary::MethodHandle_klass()) && 660 (ref_kind == JVM_REF_invokeVirtual || 661 ref_kind == JVM_REF_invokeSpecial || 662 // static invocation mode is required for _linkToVirtual, etc.: 663 ref_kind == JVM_REF_invokeStatic)) { 664 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 665 if (iid != vmIntrinsics::_none && 666 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 667 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 668 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 669 mh_invoke_id = iid; 670 } 671 } 672 673 // convert the external string or reflective type to an internal signature 674 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 675 if (type == NULL) return empty; // no such signature exists in the VM 676 677 // Time to do the lookup. 678 switch (flags & ALL_KINDS) { 679 case IS_METHOD: 680 { 681 CallInfo result; 682 bool do_dispatch = true; // default, neutral setting 683 { 684 assert(!HAS_PENDING_EXCEPTION, ""); 685 if (ref_kind == JVM_REF_invokeStatic) { 686 //do_dispatch = false; // no need, since statics are never dispatched 687 LinkResolver::resolve_static_call(result, 688 defc, name, type, caller, caller.not_null(), false, THREAD); 689 } else if (ref_kind == JVM_REF_invokeInterface) { 690 LinkResolver::resolve_interface_call(result, Handle(), defc, 691 defc, name, type, caller, caller.not_null(), false, THREAD); 692 } else if (mh_invoke_id != vmIntrinsics::_none) { 693 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 694 LinkResolver::resolve_handle_call(result, 695 defc, name, type, caller, THREAD); 696 } else if (ref_kind == JVM_REF_invokeSpecial) { 697 do_dispatch = false; // force non-virtual linkage 698 LinkResolver::resolve_special_call(result, 699 defc, name, type, caller, caller.not_null(), THREAD); 700 // CR 8029533: 701 // As a corner case, invokespecial can return a method *below* its resolved_klass. 702 // Since method search *starts* at the resolved_klass, the eventual 703 // method is almost always in a supertype *above* the resolved_klass. 704 // This pattern breaks when an invokespecial "over-reaches" beyond an 705 // immediate super to a method overridden by a super class. 706 // In that case, the selected method will be below the resolved_klass. 707 // (This is the behavior enabled by the famous ACC_SUPER classfile flag.) 708 // 709 // Downstream of this code, we make assumptions about resolved_klass being below m. 710 // (See init_method_MemberName, the comment "bad receiver limit".) 711 // We basically want to patch result._resolved_klass to be m.method_holder(). 712 // The simplest way to get this happier outcome is to re-resolve. 713 if (!HAS_PENDING_EXCEPTION && 714 caller.not_null() && 715 result.resolved_method().not_null()) { 716 // this is the m_klass value that will be checked later: 717 klassOop m_klass = result.resolved_method()->method_holder(); 718 if (m_klass != result.resolved_klass()() && 719 Klass::cast(m_klass)->is_subtype_of(result.resolved_klass()())) { 720 KlassHandle adjusted_defc(THREAD, m_klass); 721 LinkResolver::resolve_special_call(result, 722 adjusted_defc, name, type, caller, caller.not_null(), THREAD); 723 assert(HAS_PENDING_EXCEPTION // if there is something like an OOM, pass it up to caller 724 || result.resolved_method()->method_holder() == adjusted_defc(), 725 "same method, different resolved_klass"); 726 } 727 } 728 } else if (ref_kind == JVM_REF_invokeVirtual) { 729 LinkResolver::resolve_virtual_call(result, Handle(), defc, 730 defc, name, type, caller, caller.not_null(), false, THREAD); 731 } else { 732 assert(false, err_msg("ref_kind=%d", ref_kind)); 733 } 734 if (HAS_PENDING_EXCEPTION) { 735 return empty; 736 } 737 } 738 return init_method_MemberName(mname, result, THREAD); 739 } 740 case IS_CONSTRUCTOR: 741 { 742 CallInfo result; 743 { 744 assert(!HAS_PENDING_EXCEPTION, ""); 745 if (name == vmSymbols::object_initializer_name()) { 746 LinkResolver::resolve_special_call(result, 747 defc, name, type, caller, caller.not_null(), THREAD); 748 } else { 749 break; // will throw after end of switch 750 } 751 if (HAS_PENDING_EXCEPTION) { 752 return empty; 753 } 754 } 755 assert(result.is_statically_bound(), ""); 756 return init_method_MemberName(mname, result, THREAD); 757 } 758 case IS_FIELD: 759 { 760 // This is taken from LinkResolver::resolve_field, sans access checks. 761 fieldDescriptor fd; // find_field initializes fd if found 762 KlassHandle sel_klass(THREAD, instanceKlass::cast(defc())->find_field(name, type, &fd)); 763 // check if field exists; i.e., if a klass containing the field def has been selected 764 if (sel_klass.is_null()) return empty; // should not happen 765 oop type = field_signature_type_or_null(fd.signature()); 766 oop name = field_name_or_null(fd.name()); 767 bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind)); 768 mname = Handle(THREAD, 769 init_field_MemberName(mname, sel_klass, 770 fd.access_flags(), type, name, fd.offset(), is_setter)); 771 return mname; 772 } 773 default: 774 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 775 } 776 777 return empty; 778 } 779 780 // Conversely, a member name which is only initialized from JVM internals 781 // may have null defc, name, and type fields. 782 // Resolving it plants a vmtarget/vmindex in it, 783 // which refers directly to JVM internals. 784 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 785 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 786 oop vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 787 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 788 if (vmtarget == NULL) { 789 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 790 } 791 792 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 793 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 794 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 795 int flags = java_lang_invoke_MemberName::flags(mname()); 796 797 if (suppress != 0) { 798 if (suppress & _suppress_defc) have_defc = true; 799 if (suppress & _suppress_name) have_name = true; 800 if (suppress & _suppress_type) have_type = true; 801 } 802 803 if (have_defc && have_name && have_type) return; // nothing needed 804 805 switch (flags & ALL_KINDS) { 806 case IS_METHOD: 807 case IS_CONSTRUCTOR: 808 { 809 assert(vmtarget->is_method(), "method or constructor vmtarget is methodOop"); 810 methodHandle m(THREAD, methodOop(vmtarget)); 811 DEBUG_ONLY(vmtarget = NULL); // safety 812 if (m.is_null()) break; 813 if (!have_defc) { 814 klassOop defc = m->method_holder(); 815 java_lang_invoke_MemberName::set_clazz(mname(), Klass::cast(defc)->java_mirror()); 816 } 817 if (!have_name) { 818 //not java_lang_String::create_from_symbol; let's intern member names 819 Handle name = StringTable::intern(m->name(), CHECK); 820 java_lang_invoke_MemberName::set_name(mname(), name()); 821 } 822 if (!have_type) { 823 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 824 java_lang_invoke_MemberName::set_type(mname(), type()); 825 } 826 return; 827 } 828 case IS_FIELD: 829 { 830 // This is taken from LinkResolver::resolve_field, sans access checks. 831 assert(vmtarget->is_klass(), "field vmtarget is klassOop"); 832 if (!Klass::cast((klassOop) vmtarget)->oop_is_instance()) break; 833 instanceKlassHandle defc(THREAD, (klassOop) vmtarget); 834 DEBUG_ONLY(vmtarget = NULL); // safety 835 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 836 fieldDescriptor fd; // find_field initializes fd if found 837 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 838 break; // cannot expand 839 if (!have_defc) { 840 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 841 } 842 if (!have_name) { 843 //not java_lang_String::create_from_symbol; let's intern member names 844 Handle name = StringTable::intern(fd.name(), CHECK); 845 java_lang_invoke_MemberName::set_name(mname(), name()); 846 } 847 if (!have_type) { 848 // If it is a primitive field type, don't mess with short strings like "I". 849 Handle type = field_signature_type_or_null(fd.signature()); 850 if (type.is_null()) { 851 java_lang_String::create_from_symbol(fd.signature(), CHECK); 852 } 853 java_lang_invoke_MemberName::set_type(mname(), type()); 854 } 855 return; 856 } 857 } 858 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 859 } 860 861 int MethodHandles::find_MemberNames(KlassHandle k, 862 Symbol* name, Symbol* sig, 863 int mflags, KlassHandle caller, 864 int skip, objArrayHandle results) { 865 866 // %%% take caller into account! 867 868 Thread* thread = Thread::current(); 869 870 if (k.is_null() || !k->oop_is_instance()) return -1; 871 872 int rfill = 0, rlimit = results->length(), rskip = skip; 873 // overflow measurement: 874 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 875 876 int match_flags = mflags; 877 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 878 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 879 bool local_only = !(search_superc | search_intfc); 880 bool classes_only = false; 881 882 if (name != NULL) { 883 if (name->utf8_length() == 0) return 0; // a match is not possible 884 } 885 if (sig != NULL) { 886 if (sig->utf8_length() == 0) return 0; // a match is not possible 887 if (sig->byte_at(0) == '(') 888 match_flags &= ~(IS_FIELD | IS_TYPE); 889 else 890 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 891 } 892 893 if ((match_flags & IS_TYPE) != 0) { 894 // NYI, and Core Reflection works quite well for this query 895 } 896 897 if ((match_flags & IS_FIELD) != 0) { 898 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 899 if (name != NULL && st.name() != name) 900 continue; 901 if (sig != NULL && st.signature() != sig) 902 continue; 903 // passed the filters 904 if (rskip > 0) { 905 --rskip; 906 } else if (rfill < rlimit) { 907 Handle result(thread, results->obj_at(rfill++)); 908 if (!java_lang_invoke_MemberName::is_instance(result())) 909 return -99; // caller bug! 910 oop type = field_signature_type_or_null(st.signature()); 911 oop name = field_name_or_null(st.name()); 912 oop saved = MethodHandles::init_field_MemberName(result, st.klass(), 913 st.access_flags(), type, name, 914 st.offset()); 915 if (saved != result()) 916 results->obj_at_put(rfill-1, saved); // show saved instance to user 917 } else if (++overflow >= overflow_limit) { 918 match_flags = 0; break; // got tired of looking at overflow 919 } 920 } 921 } 922 923 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 924 // watch out for these guys: 925 Symbol* init_name = vmSymbols::object_initializer_name(); 926 Symbol* clinit_name = vmSymbols::class_initializer_name(); 927 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 928 bool negate_name_test = false; 929 // fix name so that it captures the intention of IS_CONSTRUCTOR 930 if (!(match_flags & IS_METHOD)) { 931 // constructors only 932 if (name == NULL) { 933 name = init_name; 934 } else if (name != init_name) { 935 return 0; // no constructors of this method name 936 } 937 } else if (!(match_flags & IS_CONSTRUCTOR)) { 938 // methods only 939 if (name == NULL) { 940 name = init_name; 941 negate_name_test = true; // if we see the name, we *omit* the entry 942 } else if (name == init_name) { 943 return 0; // no methods of this constructor name 944 } 945 } else { 946 // caller will accept either sort; no need to adjust name 947 } 948 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 949 methodOop m = st.method(); 950 Symbol* m_name = m->name(); 951 if (m_name == clinit_name) 952 continue; 953 if (name != NULL && ((m_name != name) ^ negate_name_test)) 954 continue; 955 if (sig != NULL && m->signature() != sig) 956 continue; 957 // passed the filters 958 if (rskip > 0) { 959 --rskip; 960 } else if (rfill < rlimit) { 961 Handle result(thread, results->obj_at(rfill++)); 962 if (!java_lang_invoke_MemberName::is_instance(result())) 963 return -99; // caller bug! 964 oop saved = MethodHandles::init_method_MemberName(result, m, true, KlassHandle()); 965 if (saved != result()) 966 results->obj_at_put(rfill-1, saved); // show saved instance to user 967 } else if (++overflow >= overflow_limit) { 968 match_flags = 0; break; // got tired of looking at overflow 969 } 970 } 971 } 972 973 // return number of elements we at leasted wanted to initialize 974 return rfill + overflow; 975 } 976 977 //------------------------------------------------------------------------------ 978 // MemberNameTable 979 // 980 981 MemberNameTable::MemberNameTable(int methods_cnt) 982 : GrowableArray<jweak>(methods_cnt, true) { 983 assert_locked_or_safepoint(MemberNameTable_lock); 984 } 985 986 MemberNameTable::~MemberNameTable() { 987 assert_locked_or_safepoint(MemberNameTable_lock); 988 int len = this->length(); 989 990 for (int idx = 0; idx < len; idx++) { 991 jweak ref = this->at(idx); 992 JNIHandles::destroy_weak_global(ref); 993 } 994 } 995 996 void MemberNameTable::add_member_name(int index, jweak mem_name_wref) { 997 assert_locked_or_safepoint(MemberNameTable_lock); 998 this->at_put_grow(index, mem_name_wref); 999 } 1000 1001 // Return a member name oop or NULL. 1002 oop MemberNameTable::get_member_name(int index) { 1003 assert_locked_or_safepoint(MemberNameTable_lock); 1004 jweak ref = this->at(index); 1005 oop mem_name = JNIHandles::resolve(ref); 1006 return mem_name; 1007 } 1008 1009 oop MemberNameTable::find_member_name_by_method(methodOop old_method) { 1010 assert_locked_or_safepoint(MemberNameTable_lock); 1011 oop found = NULL; 1012 int len = this->length(); 1013 1014 for (int idx = 0; idx < len; idx++) { 1015 oop mem_name = JNIHandles::resolve(this->at(idx)); 1016 if (mem_name == NULL) { 1017 continue; 1018 } 1019 methodOop method = (methodOop)java_lang_invoke_MemberName::vmtarget(mem_name); 1020 if (method == old_method) { 1021 found = mem_name; 1022 break; 1023 } 1024 } 1025 return found; 1026 } 1027 1028 // It is called at safepoint only 1029 void MemberNameTable::adjust_method_entries(methodOop* old_methods, methodOop* new_methods, 1030 int methods_length, bool *trace_name_printed) { 1031 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 1032 // search the MemberNameTable for uses of either obsolete or EMCP methods 1033 for (int j = 0; j < methods_length; j++) { 1034 methodOop old_method = old_methods[j]; 1035 methodOop new_method = new_methods[j]; 1036 oop mem_name = find_member_name_by_method(old_method); 1037 if (mem_name != NULL) { 1038 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method); 1039 1040 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 1041 if (!(*trace_name_printed)) { 1042 // RC_TRACE_MESG macro has an embedded ResourceMark 1043 RC_TRACE_MESG(("adjust: name=%s", 1044 Klass::cast(old_method->method_holder())->external_name())); 1045 *trace_name_printed = true; 1046 } 1047 // RC_TRACE macro has an embedded ResourceMark 1048 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)", 1049 new_method->name()->as_C_string(), 1050 new_method->signature()->as_C_string())); 1051 } 1052 } 1053 } 1054 } 1055 1056 // 1057 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1058 // They are the private interface between this JVM and the HotSpot-specific 1059 // Java code that implements JSR 292 method handles. 1060 // 1061 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1062 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1063 // 1064 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) { 1065 switch (which) { 1066 case MethodHandles::GC_COUNT_GWT: 1067 #ifdef COMPILER2 1068 return true; 1069 #else 1070 return false; 1071 #endif 1072 } 1073 return 0; 1074 } 1075 JVM_END 1076 1077 #ifndef PRODUCT 1078 #define EACH_NAMED_CON(template, requirement) \ 1079 template(MethodHandles,GC_COUNT_GWT) \ 1080 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1081 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1082 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1083 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1084 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1085 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1086 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1087 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1088 template(MethodHandles,GC_LAMBDA_SUPPORT) \ 1089 /*end*/ 1090 1091 #define IGNORE_REQ(req_expr) /* req_expr */ 1092 #define ONE_PLUS(scope,value) 1+ 1093 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1094 #define VALUE_COMMA(scope,value) scope::value, 1095 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1096 #define STRING_NULL(scope,value) #value "\0" 1097 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1098 1099 static bool advertise_con_value(int which) { 1100 if (which < 0) return false; 1101 bool ok = true; 1102 int count = 0; 1103 #define INC_COUNT(scope,value) \ 1104 ++count; 1105 #define CHECK_REQ(req_expr) \ 1106 if (which < count) return ok; \ 1107 ok = (req_expr); 1108 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1109 #undef INC_COUNT 1110 #undef CHECK_REQ 1111 assert(count == con_value_count, ""); 1112 if (which < count) return ok; 1113 return false; 1114 } 1115 1116 #undef ONE_PLUS 1117 #undef VALUE_COMMA 1118 #undef STRING_NULL 1119 #undef EACH_NAMED_CON 1120 #endif // PRODUCT 1121 1122 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1123 #ifndef PRODUCT 1124 if (advertise_con_value(which)) { 1125 assert(which >= 0 && which < con_value_count, ""); 1126 int con = con_values[which]; 1127 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1128 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1129 const char* str = &con_names[0]; 1130 for (int i = 0; i < which; i++) 1131 str += strlen(str) + 1; // skip name and null 1132 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1133 box->obj_at_put(0, name); 1134 } 1135 return con; 1136 } 1137 #endif 1138 return 0; 1139 } 1140 JVM_END 1141 1142 // void init(MemberName self, AccessibleObject ref) 1143 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1144 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1145 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1146 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1147 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1148 MethodHandles::init_MemberName(mname, target); 1149 } 1150 JVM_END 1151 1152 // void expand(MemberName self) 1153 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1154 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1155 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1156 MethodHandles::expand_MemberName(mname, 0, CHECK); 1157 } 1158 JVM_END 1159 1160 // void resolve(MemberName self, Class<?> caller) 1161 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1162 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1163 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1164 1165 // The trusted Java code that calls this method should already have performed 1166 // access checks on behalf of the given caller. But, we can verify this. 1167 if (VerifyMethodHandles && caller_jh != NULL && 1168 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1169 klassOop reference_klass = java_lang_Class::as_klassOop(java_lang_invoke_MemberName::clazz(mname())); 1170 if (reference_klass != NULL && Klass::cast(reference_klass)->oop_is_objArray()) { 1171 reference_klass = objArrayKlass::cast(reference_klass)->bottom_klass(); 1172 } 1173 1174 // Reflection::verify_class_access can only handle instance classes. 1175 if (reference_klass != NULL && Klass::cast(reference_klass)->oop_is_instance()) { 1176 // Emulate LinkResolver::check_klass_accessability. 1177 klassOop caller = java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh)); 1178 if (!Reflection::verify_class_access(caller, 1179 reference_klass, 1180 true)) { 1181 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), Klass::cast(reference_klass)->external_name()); 1182 } 1183 } 1184 } 1185 1186 KlassHandle caller(THREAD, 1187 caller_jh == NULL ? (klassOop) NULL : 1188 java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(caller_jh))); 1189 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1190 1191 if (resolved.is_null()) { 1192 int flags = java_lang_invoke_MemberName::flags(mname()); 1193 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1194 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1195 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1196 } 1197 if ((flags & ALL_KINDS) == IS_FIELD) { 1198 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); 1199 } else if ((flags & ALL_KINDS) == IS_METHOD || 1200 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1201 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); 1202 } else { 1203 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1204 } 1205 } 1206 1207 return JNIHandles::make_local(THREAD, resolved()); 1208 } 1209 JVM_END 1210 1211 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1212 if (mname == NULL || 1213 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1214 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1215 } else { 1216 int flags = java_lang_invoke_MemberName::flags(mname); 1217 if ((flags & IS_FIELD) != 0 && 1218 (must_be_static 1219 ? (flags & JVM_ACC_STATIC) != 0 1220 : (flags & JVM_ACC_STATIC) == 0)) { 1221 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1222 return (jlong) vmindex; 1223 } 1224 } 1225 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1226 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1227 return 0; 1228 } 1229 1230 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1231 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1232 } 1233 JVM_END 1234 1235 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1236 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1237 } 1238 JVM_END 1239 1240 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1241 // use the other function to perform sanity checks: 1242 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1243 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1244 return JNIHandles::make_local(THREAD, clazz); 1245 } 1246 JVM_END 1247 1248 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1249 if (mname_jh == NULL) return NULL; 1250 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1251 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1252 Handle vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1253 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1254 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1255 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1256 result->obj_at_put(0, x); 1257 x = NULL; 1258 if (vmtarget.is_null() || vmtarget->is_instance()) { 1259 x = vmtarget(); 1260 } else if (vmtarget->is_klass()) { 1261 x = Klass::cast((klassOop) vmtarget())->java_mirror(); 1262 } else { 1263 if (vmtarget->is_method()) { 1264 x = mname(); 1265 } else { 1266 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL); 1267 x = MethodHandles::init_MemberName(mname2(), vmtarget()); 1268 } 1269 } 1270 result->obj_at_put(1, x); 1271 return JNIHandles::make_local(env, result()); 1272 } 1273 JVM_END 1274 1275 1276 1277 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1278 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1279 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1280 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1281 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1282 if (clazz_jh == NULL || results_jh == NULL) return -1; 1283 KlassHandle k(THREAD, java_lang_Class::as_klassOop(JNIHandles::resolve_non_null(clazz_jh))); 1284 1285 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1286 if (results.is_null() || !results->is_objArray()) return -1; 1287 1288 TempNewSymbol name = NULL; 1289 TempNewSymbol sig = NULL; 1290 if (name_jh != NULL) { 1291 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1292 if (name == NULL) return 0; // a match is not possible 1293 } 1294 if (sig_jh != NULL) { 1295 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1296 if (sig == NULL) return 0; // a match is not possible 1297 } 1298 1299 KlassHandle caller; 1300 if (caller_jh != NULL) { 1301 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1302 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1303 caller = KlassHandle(THREAD, java_lang_Class::as_klassOop(caller_oop)); 1304 } 1305 1306 if (name != NULL && sig != NULL && results.not_null()) { 1307 // try a direct resolve 1308 // %%% TO DO 1309 } 1310 1311 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1312 caller, skip, results); 1313 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1314 return res; 1315 } 1316 JVM_END 1317 1318 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1319 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1320 Handle target (THREAD, JNIHandles::resolve(target_jh)); 1321 { 1322 // Walk all nmethods depending on this call site. 1323 MutexLocker mu(Compile_lock, thread); 1324 Universe::flush_dependents_on(call_site, target); 1325 java_lang_invoke_CallSite::set_target(call_site(), target()); 1326 } 1327 } 1328 JVM_END 1329 1330 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1331 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1332 Handle target (THREAD, JNIHandles::resolve(target_jh)); 1333 { 1334 // Walk all nmethods depending on this call site. 1335 MutexLocker mu(Compile_lock, thread); 1336 Universe::flush_dependents_on(call_site, target); 1337 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1338 } 1339 } 1340 JVM_END 1341 1342 /** 1343 * Throws a java/lang/UnsupportedOperationException unconditionally. 1344 * This is required by the specification of MethodHandle.invoke if 1345 * invoked directly. 1346 */ 1347 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1348 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1349 return NULL; 1350 } 1351 JVM_END 1352 1353 /** 1354 * Throws a java/lang/UnsupportedOperationException unconditionally. 1355 * This is required by the specification of MethodHandle.invokeExact if 1356 * invoked directly. 1357 */ 1358 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1359 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1360 return NULL; 1361 } 1362 JVM_END 1363 1364 /// JVM_RegisterMethodHandleMethods 1365 1366 #undef CS // Solaris builds complain 1367 1368 #define LANG "Ljava/lang/" 1369 #define JLINV "Ljava/lang/invoke/" 1370 1371 #define OBJ LANG"Object;" 1372 #define CLS LANG"Class;" 1373 #define STRG LANG"String;" 1374 #define CS JLINV"CallSite;" 1375 #define MT JLINV"MethodType;" 1376 #define MH JLINV"MethodHandle;" 1377 #define MEM JLINV"MemberName;" 1378 1379 #define CC (char*) /*cast a literal from (const char*)*/ 1380 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1381 1382 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1383 static JNINativeMethod MHN_methods[] = { 1384 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)}, 1385 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)}, 1386 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)}, 1387 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)}, 1388 // static native int getNamedCon(int which, Object[] name) 1389 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)}, 1390 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1391 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1392 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}, 1393 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)}, 1394 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1395 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1396 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)}, 1397 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)}, 1398 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)} 1399 }; 1400 1401 static JNINativeMethod MH_methods[] = { 1402 // UnsupportedOperationException throwers 1403 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)}, 1404 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)} 1405 }; 1406 1407 /** 1408 * Helper method to register native methods. 1409 */ 1410 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1411 int status = env->RegisterNatives(clazz, methods, nMethods); 1412 if (status != JNI_OK || env->ExceptionOccurred()) { 1413 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 1414 env->ExceptionClear(); 1415 return false; 1416 } 1417 return true; 1418 } 1419 1420 /** 1421 * This one function is exported, used by NativeLookup. 1422 */ 1423 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1424 if (!EnableInvokeDynamic) { 1425 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable."); 1426 return; // bind nothing 1427 } 1428 1429 assert(!MethodHandles::enabled(), "must not be enabled"); 1430 bool enable_MH = true; 1431 1432 jclass MH_class = NULL; 1433 if (SystemDictionary::MethodHandle_klass() == NULL) { 1434 enable_MH = false; 1435 } else { 1436 oop mirror = Klass::cast(SystemDictionary::MethodHandle_klass())->java_mirror(); 1437 MH_class = (jclass) JNIHandles::make_local(env, mirror); 1438 } 1439 1440 if (enable_MH) { 1441 ThreadToNativeFromVM ttnfv(thread); 1442 1443 if (enable_MH) { 1444 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1445 } 1446 if (enable_MH) { 1447 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1448 } 1449 } 1450 1451 if (TraceInvokeDynamic) { 1452 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1453 } 1454 1455 if (enable_MH) { 1456 MethodHandles::generate_adapters(); 1457 MethodHandles::set_enabled(true); 1458 } 1459 } 1460 JVM_END