1 /* 2 * Copyright (c) 2008, 2013, 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, 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 Thread* thread = Thread::current(); 131 oop target_oop = target(); 132 Klass* target_klass = target_oop->klass(); 133 if (target_klass == SystemDictionary::reflect_Field_klass()) { 134 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 135 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 136 int mods = java_lang_reflect_Field::modifiers(target_oop); 137 oop type = java_lang_reflect_Field::type(target_oop); 138 oop name = java_lang_reflect_Field::name(target_oop); 139 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 140 intptr_t offset = InstanceKlass::cast(k())->field_offset(slot); 141 return init_field_MemberName(mname, k, accessFlags_from(mods), type, name, offset); 142 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 143 oop clazz = java_lang_reflect_Method::clazz(target_oop); 144 int slot = java_lang_reflect_Method::slot(target_oop); 145 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 146 if (!k.is_null() && k->oop_is_instance()) { 147 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 148 return init_method_MemberName(mname, m, true, k); 149 } 150 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 151 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 152 int slot = java_lang_reflect_Constructor::slot(target_oop); 153 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 154 if (!k.is_null() && k->oop_is_instance()) { 155 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 156 return init_method_MemberName(mname, m, false, k); 157 } 158 } else if (target_klass == SystemDictionary::MemberName_klass()) { 159 // Note: This only works if the MemberName has already been resolved. 160 oop clazz = java_lang_invoke_MemberName::clazz(target_oop); 161 int flags = java_lang_invoke_MemberName::flags(target_oop); 162 Metadata* vmtarget=java_lang_invoke_MemberName::vmtarget(target_oop); 163 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(target_oop); 164 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 165 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 166 if (vmtarget == NULL) return NULL; // not resolved 167 if ((flags & IS_FIELD) != 0) { 168 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 169 int basic_mods = (ref_kind_is_static(ref_kind) ? JVM_ACC_STATIC : 0); 170 // FIXME: how does k (receiver_limit) contribute? 171 KlassHandle k_vmtarget(thread, (Klass*)vmtarget); 172 return init_field_MemberName(mname, k_vmtarget, accessFlags_from(basic_mods), NULL, NULL, vmindex); 173 } else if ((flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 174 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 175 return init_method_MemberName(mname, (Method*)vmtarget, ref_kind_does_dispatch(ref_kind), k); 176 } else { 177 return NULL; 178 } 179 } 180 return NULL; 181 } 182 183 oop MethodHandles::init_method_MemberName(Handle mname, Method* m, bool do_dispatch, 184 KlassHandle receiver_limit_h) { 185 Klass* receiver_limit = receiver_limit_h(); 186 AccessFlags mods = m->access_flags(); 187 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 188 int vmindex = Method::nonvirtual_vtable_index; // implies never any dispatch 189 Klass* mklass = m->method_holder(); 190 if (receiver_limit == NULL) 191 receiver_limit = mklass; 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 (receiver_limit != mklass && 197 !receiver_limit->is_subtype_of(mklass)) { 198 return NULL; // bad receiver limit 199 } else if (do_dispatch && receiver_limit->is_interface() && 200 mklass->is_interface()) { 201 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 202 receiver_limit = mklass; // ignore passed-in limit; interfaces are interconvertible 203 vmindex = klassItable::compute_itable_index(m); 204 } else if (do_dispatch && mklass != receiver_limit && mklass->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(receiver_limit)->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 // @CallerSensitive annotation detected 218 if (m->caller_sensitive()) { 219 flags |= CALLER_SENSITIVE; 220 } 221 222 oop mname_oop = mname(); 223 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 224 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m); 225 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 226 java_lang_invoke_MemberName::set_clazz( mname_oop, receiver_limit->java_mirror()); 227 // Note: name and type can be lazily computed by resolve_MemberName, 228 // if Java code needs them as resolved String and MethodType objects. 229 // The clazz must be eagerly stored, because it provides a GC 230 // root to help keep alive the Method*. 231 // If relevant, the vtable or itable value is stored as vmindex. 232 // This is done eagerly, since it is readily available without 233 // constructing any new objects. 234 // TO DO: maybe intern mname_oop 235 m->method_holder()->add_member_name(m->method_idnum(), mname); 236 237 return mname(); 238 } 239 240 Handle MethodHandles::init_method_MemberName(Handle mname, CallInfo& info, TRAPS) { 241 Handle empty; 242 if (info.resolved_appendix().not_null()) { 243 // The resolved MemberName must not be accompanied by an appendix argument, 244 // since there is no way to bind this value into the MemberName. 245 // Caller is responsible to prevent this from happening. 246 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 247 } 248 methodHandle m = info.resolved_method(); 249 KlassHandle defc = info.resolved_klass(); 250 int vmindex = Method::invalid_vtable_index; 251 if (defc->is_interface() && m->method_holder()->is_interface()) { 252 // static interface methods do not reference vtable or itable 253 if (m->is_static()) { 254 vmindex = Method::nonvirtual_vtable_index; 255 } 256 // interface methods invoked via invokespecial also 257 // do not reference vtable or itable. 258 int ref_kind = ((java_lang_invoke_MemberName::flags(mname()) >> 259 REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK); 260 if (ref_kind == JVM_REF_invokeSpecial) { 261 vmindex = Method::nonvirtual_vtable_index; 262 } 263 // If neither m is static nor ref_kind is invokespecial, 264 // set it to itable index. 265 if (vmindex == Method::invalid_vtable_index) { 266 // LinkResolver does not report itable indexes! (fix this?) 267 vmindex = klassItable::compute_itable_index(m()); 268 } 269 } else if (m->can_be_statically_bound()) { 270 // LinkResolver reports vtable index even for final methods! 271 vmindex = Method::nonvirtual_vtable_index; 272 } else { 273 vmindex = info.vtable_index(); 274 } 275 oop res = init_method_MemberName(mname, m(), (vmindex >= 0), defc()); 276 assert(res == NULL || (java_lang_invoke_MemberName::vmindex(res) == vmindex), ""); 277 return Handle(THREAD, res); 278 } 279 280 oop MethodHandles::init_field_MemberName(Handle mname, KlassHandle field_holder, 281 AccessFlags mods, oop type, oop name, 282 intptr_t offset, bool is_setter) { 283 int flags = (jushort)( mods.as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 284 flags |= IS_FIELD | ((mods.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 285 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 286 Metadata* vmtarget = field_holder(); 287 int vmindex = offset; // determines the field uniquely when combined with static bit 288 oop mname_oop = mname(); 289 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 290 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 291 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 292 java_lang_invoke_MemberName::set_clazz(mname_oop, field_holder->java_mirror()); 293 if (name != NULL) 294 java_lang_invoke_MemberName::set_name(mname_oop, name); 295 if (type != NULL) 296 java_lang_invoke_MemberName::set_type(mname_oop, type); 297 // Note: name and type can be lazily computed by resolve_MemberName, 298 // if Java code needs them as resolved String and Class objects. 299 // Note that the incoming type oop might be pre-resolved (non-null). 300 // The base clazz and field offset (vmindex) must be eagerly stored, 301 // because they unambiguously identify the field. 302 // Although the fieldDescriptor::_index would also identify the field, 303 // we do not use it, because it is harder to decode. 304 // TO DO: maybe intern mname_oop 305 return mname(); 306 } 307 308 Handle MethodHandles::init_field_MemberName(Handle mname, FieldAccessInfo& info, TRAPS) { 309 return Handle(); 310 #if 0 // FIXME 311 KlassHandle field_holder = info.klass(); 312 intptr_t field_offset = info.field_offset(); 313 return init_field_MemberName(mname_oop, field_holder(), 314 info.access_flags(), 315 type, name, 316 field_offset, false /*is_setter*/); 317 #endif 318 } 319 320 321 // JVM 2.9 Special Methods: 322 // A method is signature polymorphic if and only if all of the following conditions hold : 323 // * It is declared in the java.lang.invoke.MethodHandle class. 324 // * It has a single formal parameter of type Object[]. 325 // * It has a return type of Object. 326 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 327 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 328 if (klass == NULL) 329 return false; 330 // The following test will fail spuriously during bootstrap of MethodHandle itself: 331 // if (klass != SystemDictionary::MethodHandle_klass()) 332 // Test the name instead: 333 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle()) 334 return false; 335 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 336 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig); 337 if (m == NULL) return false; 338 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 339 int flags = m->access_flags().as_int(); 340 return (flags & required) == required; 341 } 342 343 344 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 345 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid)); 346 switch (iid) { 347 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 348 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 349 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 350 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 351 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 352 } 353 assert(false, ""); 354 return 0; 355 } 356 357 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 358 switch (iid) { 359 case vmIntrinsics::_invokeBasic: return 0; 360 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 361 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 362 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 363 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 364 } 365 assert(false, err_msg("iid=%d", iid)); 366 return 0; 367 } 368 369 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 370 vmSymbols::SID name_id = vmSymbols::find_sid(name); 371 switch (name_id) { 372 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 373 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 374 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 375 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 376 377 // There is one static signature-polymorphic method for each JVM invocation mode. 378 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 379 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 380 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 381 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 382 } 383 384 // Cover the case of invokeExact and any future variants of invokeFoo. 385 Klass* mh_klass = SystemDictionary::well_known_klass( 386 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 387 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) 388 return vmIntrinsics::_invokeGeneric; 389 390 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 391 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 392 return vmIntrinsics::_none; 393 } 394 395 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 396 if (klass != NULL && 397 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) { 398 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 399 if (iid != vmIntrinsics::_none) 400 return iid; 401 if (is_method_handle_invoke_name(klass, name)) 402 return vmIntrinsics::_invokeGeneric; 403 } 404 return vmIntrinsics::_none; 405 } 406 407 408 // convert the external string or reflective type to an internal signature 409 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 410 if (java_lang_invoke_MethodType::is_instance(type_str)) { 411 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, CHECK_NULL); 412 } else if (java_lang_Class::is_instance(type_str)) { 413 return java_lang_Class::as_signature(type_str, false, CHECK_NULL); 414 } else if (java_lang_String::is_instance(type_str)) { 415 if (intern_if_not_found) { 416 return java_lang_String::as_symbol(type_str, CHECK_NULL); 417 } else { 418 return java_lang_String::as_symbol_or_null(type_str); 419 } 420 } else { 421 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 422 } 423 } 424 425 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 426 enum { OBJ_SIG_LEN = 18 }; 427 428 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 429 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 430 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 431 const int len = sig->utf8_length(); 432 for (int i = 0; i < len; i++) { 433 switch (sig->byte_at(i)) { 434 case 'L': 435 // only java/lang/Object is valid here 436 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 437 return false; 438 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 439 continue; 440 case '(': case ')': case 'V': 441 case 'I': case 'J': case 'F': case 'D': 442 continue; 443 //case '[': 444 //case 'Z': case 'B': case 'C': case 'S': 445 default: 446 return false; 447 } 448 } 449 return true; 450 } 451 452 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 453 Symbol* bsig = NULL; 454 if (sig == NULL) { 455 return sig; 456 } else if (is_basic_type_signature(sig)) { 457 sig->increment_refcount(); 458 return sig; // that was easy 459 } else if (sig->byte_at(0) != '(') { 460 BasicType bt = char2type(sig->byte_at(0)); 461 if (is_subword_type(bt)) { 462 bsig = vmSymbols::int_signature(); 463 } else { 464 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 465 bsig = vmSymbols::object_signature(); 466 } 467 } else { 468 ResourceMark rm; 469 stringStream buffer(128); 470 buffer.put('('); 471 int arg_pos = 0, keep_arg_pos = -1; 472 if (keep_last_arg) 473 keep_arg_pos = ArgumentCount(sig).size() - 1; 474 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 475 BasicType bt = ss.type(); 476 size_t this_arg_pos = buffer.size(); 477 if (ss.at_return_type()) { 478 buffer.put(')'); 479 } 480 if (arg_pos == keep_arg_pos) { 481 buffer.write((char*) ss.raw_bytes(), 482 (int) ss.raw_length()); 483 } else if (bt == T_OBJECT || bt == T_ARRAY) { 484 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 485 } else { 486 if (is_subword_type(bt)) 487 bt = T_INT; 488 buffer.put(type2char(bt)); 489 } 490 arg_pos++; 491 } 492 const char* sigstr = buffer.base(); 493 int siglen = (int) buffer.size(); 494 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 495 } 496 assert(is_basic_type_signature(bsig) || 497 // detune assert in case the injected argument is not a basic type: 498 keep_last_arg, ""); 499 return bsig; 500 } 501 502 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 503 Symbol* sig, 504 bool keep_arrays, 505 bool keep_basic_names) { 506 st = st ? st : tty; 507 int len = sig->utf8_length(); 508 int array = 0; 509 bool prev_type = false; 510 for (int i = 0; i < len; i++) { 511 char ch = sig->byte_at(i); 512 switch (ch) { 513 case '(': case ')': 514 prev_type = false; 515 st->put(ch); 516 continue; 517 case '[': 518 if (!keep_basic_names && keep_arrays) 519 st->put(ch); 520 array++; 521 continue; 522 case 'L': 523 { 524 if (prev_type) st->put(','); 525 int start = i+1, slash = start; 526 while (++i < len && (ch = sig->byte_at(i)) != ';') { 527 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 528 } 529 if (slash < i) start = slash; 530 if (!keep_basic_names) { 531 st->put('L'); 532 } else { 533 for (int j = start; j < i; j++) 534 st->put(sig->byte_at(j)); 535 prev_type = true; 536 } 537 break; 538 } 539 default: 540 { 541 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 542 ch = '['; 543 array = 0; 544 } 545 if (prev_type) st->put(','); 546 const char* n = NULL; 547 if (keep_basic_names) 548 n = type2name(char2type(ch)); 549 if (n == NULL) { 550 // unknown letter, or we don't want to know its name 551 st->put(ch); 552 } else { 553 st->print(n); 554 prev_type = true; 555 } 556 break; 557 } 558 } 559 // Switch break goes here to take care of array suffix: 560 if (prev_type) { 561 while (array > 0) { 562 st->print("[]"); 563 --array; 564 } 565 } 566 array = 0; 567 } 568 } 569 570 571 572 static oop object_java_mirror() { 573 return SystemDictionary::Object_klass()->java_mirror(); 574 } 575 576 static oop field_name_or_null(Symbol* s) { 577 if (s == NULL) return NULL; 578 return StringTable::lookup(s); 579 } 580 581 static oop field_signature_type_or_null(Symbol* s) { 582 if (s == NULL) return NULL; 583 BasicType bt = FieldType::basic_type(s); 584 if (is_java_primitive(bt)) { 585 assert(s->utf8_length() == 1, ""); 586 return java_lang_Class::primitive_mirror(bt); 587 } 588 // Here are some more short cuts for common types. 589 // They are optional, since reference types can be resolved lazily. 590 if (bt == T_OBJECT) { 591 if (s == vmSymbols::object_signature()) { 592 return object_java_mirror(); 593 } else if (s == vmSymbols::class_signature()) { 594 return SystemDictionary::Class_klass()->java_mirror(); 595 } else if (s == vmSymbols::string_signature()) { 596 return SystemDictionary::String_klass()->java_mirror(); 597 } 598 } 599 return NULL; 600 } 601 602 603 // An unresolved member name is a mere symbolic reference. 604 // Resolving it plants a vmtarget/vmindex in it, 605 // which refers directly to JVM internals. 606 Handle MethodHandles::resolve_MemberName(Handle mname, TRAPS) { 607 Handle empty; 608 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 609 610 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 611 // Already resolved. 612 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 613 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 614 return mname; 615 } 616 617 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 618 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 619 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 620 int flags = java_lang_invoke_MemberName::flags(mname()); 621 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 622 if (!ref_kind_is_valid(ref_kind)) { 623 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 624 } 625 626 DEBUG_ONLY(int old_vmindex); 627 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 628 629 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 630 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 631 } 632 633 instanceKlassHandle defc; 634 { 635 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 636 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 637 if (!defc_klass->oop_is_instance()) { 638 if (!defc_klass->oop_is_array()) return empty; 639 defc_klass = SystemDictionary::Object_klass(); 640 } 641 defc = instanceKlassHandle(THREAD, defc_klass); 642 } 643 if (defc.is_null()) { 644 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 645 } 646 defc->link_class(CHECK_(empty)); // possible safepoint 647 648 // convert the external string name to an internal symbol 649 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 650 if (name == NULL) return empty; // no such name 651 if (name == vmSymbols::class_initializer_name()) 652 return empty; // illegal name 653 654 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 655 if ((flags & ALL_KINDS) == IS_METHOD && 656 (defc() == SystemDictionary::MethodHandle_klass()) && 657 (ref_kind == JVM_REF_invokeVirtual || 658 ref_kind == JVM_REF_invokeSpecial || 659 // static invocation mode is required for _linkToVirtual, etc.: 660 ref_kind == JVM_REF_invokeStatic)) { 661 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 662 if (iid != vmIntrinsics::_none && 663 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 664 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 665 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 666 mh_invoke_id = iid; 667 } 668 } 669 670 // convert the external string or reflective type to an internal signature 671 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 672 if (type == NULL) return empty; // no such signature exists in the VM 673 674 // Time to do the lookup. 675 switch (flags & ALL_KINDS) { 676 case IS_METHOD: 677 { 678 CallInfo result; 679 { 680 assert(!HAS_PENDING_EXCEPTION, ""); 681 if (ref_kind == JVM_REF_invokeStatic) { 682 LinkResolver::resolve_static_call(result, 683 defc, name, type, KlassHandle(), false, false, THREAD); 684 } else if (ref_kind == JVM_REF_invokeInterface) { 685 LinkResolver::resolve_interface_call(result, Handle(), defc, 686 defc, name, type, KlassHandle(), false, false, THREAD); 687 } else if (mh_invoke_id != vmIntrinsics::_none) { 688 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 689 LinkResolver::resolve_handle_call(result, 690 defc, name, type, KlassHandle(), THREAD); 691 } else if (ref_kind == JVM_REF_invokeSpecial) { 692 LinkResolver::resolve_special_call(result, 693 defc, name, type, KlassHandle(), false, THREAD); 694 } else if (ref_kind == JVM_REF_invokeVirtual) { 695 LinkResolver::resolve_virtual_call(result, Handle(), defc, 696 defc, name, type, KlassHandle(), false, false, THREAD); 697 } else { 698 assert(false, err_msg("ref_kind=%d", ref_kind)); 699 } 700 if (HAS_PENDING_EXCEPTION) { 701 return empty; 702 } 703 } 704 return init_method_MemberName(mname, result, THREAD); 705 } 706 case IS_CONSTRUCTOR: 707 { 708 CallInfo result; 709 { 710 assert(!HAS_PENDING_EXCEPTION, ""); 711 if (name == vmSymbols::object_initializer_name()) { 712 LinkResolver::resolve_special_call(result, 713 defc, name, type, KlassHandle(), false, THREAD); 714 } else { 715 break; // will throw after end of switch 716 } 717 if (HAS_PENDING_EXCEPTION) { 718 return empty; 719 } 720 } 721 assert(result.is_statically_bound(), ""); 722 return init_method_MemberName(mname, result, THREAD); 723 } 724 case IS_FIELD: 725 { 726 // This is taken from LinkResolver::resolve_field, sans access checks. 727 fieldDescriptor fd; // find_field initializes fd if found 728 KlassHandle sel_klass(THREAD, InstanceKlass::cast(defc())->find_field(name, type, &fd)); 729 // check if field exists; i.e., if a klass containing the field def has been selected 730 if (sel_klass.is_null()) return empty; // should not happen 731 oop type = field_signature_type_or_null(fd.signature()); 732 oop name = field_name_or_null(fd.name()); 733 bool is_setter = (ref_kind_is_valid(ref_kind) && ref_kind_is_setter(ref_kind)); 734 mname = Handle(THREAD, 735 init_field_MemberName(mname, sel_klass, 736 fd.access_flags(), type, name, fd.offset(), is_setter)); 737 return mname; 738 } 739 default: 740 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 741 } 742 743 return empty; 744 } 745 746 // Conversely, a member name which is only initialized from JVM internals 747 // may have null defc, name, and type fields. 748 // Resolving it plants a vmtarget/vmindex in it, 749 // which refers directly to JVM internals. 750 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 751 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 752 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 753 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 754 if (vmtarget == NULL) { 755 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 756 } 757 758 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 759 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 760 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 761 int flags = java_lang_invoke_MemberName::flags(mname()); 762 763 if (suppress != 0) { 764 if (suppress & _suppress_defc) have_defc = true; 765 if (suppress & _suppress_name) have_name = true; 766 if (suppress & _suppress_type) have_type = true; 767 } 768 769 if (have_defc && have_name && have_type) return; // nothing needed 770 771 switch (flags & ALL_KINDS) { 772 case IS_METHOD: 773 case IS_CONSTRUCTOR: 774 { 775 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 776 methodHandle m(THREAD, (Method*)vmtarget); 777 DEBUG_ONLY(vmtarget = NULL); // safety 778 if (m.is_null()) break; 779 if (!have_defc) { 780 InstanceKlass* defc = m->method_holder(); 781 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 782 } 783 if (!have_name) { 784 //not java_lang_String::create_from_symbol; let's intern member names 785 Handle name = StringTable::intern(m->name(), CHECK); 786 java_lang_invoke_MemberName::set_name(mname(), name()); 787 } 788 if (!have_type) { 789 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 790 java_lang_invoke_MemberName::set_type(mname(), type()); 791 } 792 return; 793 } 794 case IS_FIELD: 795 { 796 // This is taken from LinkResolver::resolve_field, sans access checks. 797 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 798 if (!((Klass*) vmtarget)->oop_is_instance()) break; 799 instanceKlassHandle defc(THREAD, (Klass*) vmtarget); 800 DEBUG_ONLY(vmtarget = NULL); // safety 801 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 802 fieldDescriptor fd; // find_field initializes fd if found 803 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 804 break; // cannot expand 805 if (!have_defc) { 806 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 807 } 808 if (!have_name) { 809 //not java_lang_String::create_from_symbol; let's intern member names 810 Handle name = StringTable::intern(fd.name(), CHECK); 811 java_lang_invoke_MemberName::set_name(mname(), name()); 812 } 813 if (!have_type) { 814 // If it is a primitive field type, don't mess with short strings like "I". 815 Handle type = field_signature_type_or_null(fd.signature()); 816 if (type.is_null()) { 817 java_lang_String::create_from_symbol(fd.signature(), CHECK); 818 } 819 java_lang_invoke_MemberName::set_type(mname(), type()); 820 } 821 return; 822 } 823 } 824 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 825 } 826 827 int MethodHandles::find_MemberNames(KlassHandle k, 828 Symbol* name, Symbol* sig, 829 int mflags, KlassHandle caller, 830 int skip, objArrayHandle results) { 831 // %%% take caller into account! 832 833 Thread* thread = Thread::current(); 834 835 if (k.is_null() || !k->oop_is_instance()) return -1; 836 837 int rfill = 0, rlimit = results->length(), rskip = skip; 838 // overflow measurement: 839 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 840 841 int match_flags = mflags; 842 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 843 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 844 bool local_only = !(search_superc | search_intfc); 845 bool classes_only = false; 846 847 if (name != NULL) { 848 if (name->utf8_length() == 0) return 0; // a match is not possible 849 } 850 if (sig != NULL) { 851 if (sig->utf8_length() == 0) return 0; // a match is not possible 852 if (sig->byte_at(0) == '(') 853 match_flags &= ~(IS_FIELD | IS_TYPE); 854 else 855 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 856 } 857 858 if ((match_flags & IS_TYPE) != 0) { 859 // NYI, and Core Reflection works quite well for this query 860 } 861 862 if ((match_flags & IS_FIELD) != 0) { 863 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 864 if (name != NULL && st.name() != name) 865 continue; 866 if (sig != NULL && st.signature() != sig) 867 continue; 868 // passed the filters 869 if (rskip > 0) { 870 --rskip; 871 } else if (rfill < rlimit) { 872 Handle result(thread, results->obj_at(rfill++)); 873 if (!java_lang_invoke_MemberName::is_instance(result())) 874 return -99; // caller bug! 875 oop type = field_signature_type_or_null(st.signature()); 876 oop name = field_name_or_null(st.name()); 877 oop saved = MethodHandles::init_field_MemberName(result, st.klass(), 878 st.access_flags(), type, name, 879 st.offset()); 880 if (saved != result()) 881 results->obj_at_put(rfill-1, saved); // show saved instance to user 882 } else if (++overflow >= overflow_limit) { 883 match_flags = 0; break; // got tired of looking at overflow 884 } 885 } 886 } 887 888 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 889 // watch out for these guys: 890 Symbol* init_name = vmSymbols::object_initializer_name(); 891 Symbol* clinit_name = vmSymbols::class_initializer_name(); 892 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 893 bool negate_name_test = false; 894 // fix name so that it captures the intention of IS_CONSTRUCTOR 895 if (!(match_flags & IS_METHOD)) { 896 // constructors only 897 if (name == NULL) { 898 name = init_name; 899 } else if (name != init_name) { 900 return 0; // no constructors of this method name 901 } 902 } else if (!(match_flags & IS_CONSTRUCTOR)) { 903 // methods only 904 if (name == NULL) { 905 name = init_name; 906 negate_name_test = true; // if we see the name, we *omit* the entry 907 } else if (name == init_name) { 908 return 0; // no methods of this constructor name 909 } 910 } else { 911 // caller will accept either sort; no need to adjust name 912 } 913 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 914 Method* m = st.method(); 915 Symbol* m_name = m->name(); 916 if (m_name == clinit_name) 917 continue; 918 if (name != NULL && ((m_name != name) ^ negate_name_test)) 919 continue; 920 if (sig != NULL && m->signature() != sig) 921 continue; 922 // passed the filters 923 if (rskip > 0) { 924 --rskip; 925 } else if (rfill < rlimit) { 926 Handle result(thread, results->obj_at(rfill++)); 927 if (!java_lang_invoke_MemberName::is_instance(result())) 928 return -99; // caller bug! 929 oop saved = MethodHandles::init_method_MemberName(result, m, true, NULL); 930 if (saved != result()) 931 results->obj_at_put(rfill-1, saved); // show saved instance to user 932 } else if (++overflow >= overflow_limit) { 933 match_flags = 0; break; // got tired of looking at overflow 934 } 935 } 936 } 937 938 // return number of elements we at leasted wanted to initialize 939 return rfill + overflow; 940 } 941 942 //------------------------------------------------------------------------------ 943 // MemberNameTable 944 // 945 946 MemberNameTable::MemberNameTable(int methods_cnt) 947 : GrowableArray<jweak>(methods_cnt, true) { 948 assert_locked_or_safepoint(MemberNameTable_lock); 949 } 950 951 MemberNameTable::~MemberNameTable() { 952 assert_locked_or_safepoint(MemberNameTable_lock); 953 int len = this->length(); 954 955 for (int idx = 0; idx < len; idx++) { 956 jweak ref = this->at(idx); 957 JNIHandles::destroy_weak_global(ref); 958 } 959 } 960 961 void MemberNameTable::add_member_name(int index, jweak mem_name_wref) { 962 assert_locked_or_safepoint(MemberNameTable_lock); 963 this->at_put_grow(index, mem_name_wref); 964 } 965 966 // Return a member name oop or NULL. 967 oop MemberNameTable::get_member_name(int index) { 968 assert_locked_or_safepoint(MemberNameTable_lock); 969 970 jweak ref = this->at(index); 971 oop mem_name = JNIHandles::resolve(ref); 972 return mem_name; 973 } 974 975 #if INCLUDE_JVMTI 976 oop MemberNameTable::find_member_name_by_method(Method* old_method) { 977 assert_locked_or_safepoint(MemberNameTable_lock); 978 oop found = NULL; 979 int len = this->length(); 980 981 for (int idx = 0; idx < len; idx++) { 982 oop mem_name = JNIHandles::resolve(this->at(idx)); 983 if (mem_name == NULL) { 984 continue; 985 } 986 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); 987 if (method == old_method) { 988 found = mem_name; 989 break; 990 } 991 } 992 return found; 993 } 994 995 // It is called at safepoint only 996 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods, 997 int methods_length, bool *trace_name_printed) { 998 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 999 // search the MemberNameTable for uses of either obsolete or EMCP methods 1000 for (int j = 0; j < methods_length; j++) { 1001 Method* old_method = old_methods[j]; 1002 Method* new_method = new_methods[j]; 1003 oop mem_name = find_member_name_by_method(old_method); 1004 if (mem_name != NULL) { 1005 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, new_method); 1006 1007 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 1008 if (!(*trace_name_printed)) { 1009 // RC_TRACE_MESG macro has an embedded ResourceMark 1010 RC_TRACE_MESG(("adjust: name=%s", 1011 old_method->method_holder()->external_name())); 1012 *trace_name_printed = true; 1013 } 1014 // RC_TRACE macro has an embedded ResourceMark 1015 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)", 1016 new_method->name()->as_C_string(), 1017 new_method->signature()->as_C_string())); 1018 } 1019 } 1020 } 1021 } 1022 #endif // INCLUDE_JVMTI 1023 1024 // 1025 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1026 // They are the private interface between this JVM and the HotSpot-specific 1027 // Java code that implements JSR 292 method handles. 1028 // 1029 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1030 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1031 // 1032 1033 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) { 1034 switch (which) { 1035 case MethodHandles::GC_COUNT_GWT: 1036 #ifdef COMPILER2 1037 return true; 1038 #else 1039 return false; 1040 #endif 1041 } 1042 return 0; 1043 } 1044 JVM_END 1045 1046 #ifndef PRODUCT 1047 #define EACH_NAMED_CON(template, requirement) \ 1048 template(MethodHandles,GC_COUNT_GWT) \ 1049 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1050 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1051 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1052 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1053 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1054 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1055 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1056 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1057 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1058 template(MethodHandles,GC_LAMBDA_SUPPORT) \ 1059 /*end*/ 1060 1061 #define IGNORE_REQ(req_expr) /* req_expr */ 1062 #define ONE_PLUS(scope,value) 1+ 1063 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1064 #define VALUE_COMMA(scope,value) scope::value, 1065 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1066 #define STRING_NULL(scope,value) #value "\0" 1067 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1068 1069 static bool advertise_con_value(int which) { 1070 if (which < 0) return false; 1071 bool ok = true; 1072 int count = 0; 1073 #define INC_COUNT(scope,value) \ 1074 ++count; 1075 #define CHECK_REQ(req_expr) \ 1076 if (which < count) return ok; \ 1077 ok = (req_expr); 1078 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1079 #undef INC_COUNT 1080 #undef CHECK_REQ 1081 assert(count == con_value_count, ""); 1082 if (which < count) return ok; 1083 return false; 1084 } 1085 1086 #undef ONE_PLUS 1087 #undef VALUE_COMMA 1088 #undef STRING_NULL 1089 #undef EACH_NAMED_CON 1090 #endif // PRODUCT 1091 1092 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1093 #ifndef PRODUCT 1094 if (advertise_con_value(which)) { 1095 assert(which >= 0 && which < con_value_count, ""); 1096 int con = con_values[which]; 1097 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1098 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1099 const char* str = &con_names[0]; 1100 for (int i = 0; i < which; i++) 1101 str += strlen(str) + 1; // skip name and null 1102 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1103 box->obj_at_put(0, name); 1104 } 1105 return con; 1106 } 1107 #endif 1108 return 0; 1109 } 1110 JVM_END 1111 1112 // void init(MemberName self, AccessibleObject ref) 1113 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1114 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1115 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1116 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1117 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1118 MethodHandles::init_MemberName(mname, target); 1119 } 1120 JVM_END 1121 1122 // void expand(MemberName self) 1123 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1124 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1125 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1126 MethodHandles::expand_MemberName(mname, 0, CHECK); 1127 } 1128 JVM_END 1129 1130 // void resolve(MemberName self, Class<?> caller) 1131 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1132 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1133 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1134 1135 // The trusted Java code that calls this method should already have performed 1136 // access checks on behalf of the given caller. But, we can verify this. 1137 if (VerifyMethodHandles && caller_jh != NULL && 1138 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1139 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1140 if (reference_klass != NULL && reference_klass->oop_is_objArray()) { 1141 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1142 } 1143 1144 // Reflection::verify_class_access can only handle instance classes. 1145 if (reference_klass != NULL && reference_klass->oop_is_instance()) { 1146 // Emulate LinkResolver::check_klass_accessability. 1147 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1148 if (!Reflection::verify_class_access(caller, 1149 reference_klass, 1150 true)) { 1151 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1152 } 1153 } 1154 } 1155 1156 Handle resolved = MethodHandles::resolve_MemberName(mname, CHECK_NULL); 1157 if (resolved.is_null()) { 1158 int flags = java_lang_invoke_MemberName::flags(mname()); 1159 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1160 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1161 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1162 } 1163 if ((flags & ALL_KINDS) == IS_FIELD) { 1164 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); 1165 } else if ((flags & ALL_KINDS) == IS_METHOD || 1166 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1167 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); 1168 } else { 1169 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1170 } 1171 } 1172 1173 return JNIHandles::make_local(THREAD, resolved()); 1174 } 1175 JVM_END 1176 1177 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1178 if (mname == NULL || 1179 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1180 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1181 } else { 1182 int flags = java_lang_invoke_MemberName::flags(mname); 1183 if ((flags & IS_FIELD) != 0 && 1184 (must_be_static 1185 ? (flags & JVM_ACC_STATIC) != 0 1186 : (flags & JVM_ACC_STATIC) == 0)) { 1187 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1188 return (jlong) vmindex; 1189 } 1190 } 1191 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1192 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1193 return 0; 1194 } 1195 1196 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1197 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1198 } 1199 JVM_END 1200 1201 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1202 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1203 } 1204 JVM_END 1205 1206 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1207 // use the other function to perform sanity checks: 1208 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1209 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1210 return JNIHandles::make_local(THREAD, clazz); 1211 } 1212 JVM_END 1213 1214 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1215 if (mname_jh == NULL) return NULL; 1216 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1217 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1218 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1219 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1220 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1221 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1222 result->obj_at_put(0, x); 1223 x = NULL; 1224 if (vmtarget == NULL) { 1225 x = NULL; 1226 } else if (vmtarget->is_klass()) { 1227 x = ((Klass*) vmtarget)->java_mirror(); 1228 } else if (vmtarget->is_method()) { 1229 Handle mname2 = MethodHandles::new_MemberName(CHECK_NULL); 1230 x = MethodHandles::init_method_MemberName(mname2, (Method*)vmtarget, false, NULL); 1231 } 1232 result->obj_at_put(1, x); 1233 return JNIHandles::make_local(env, result()); 1234 } 1235 JVM_END 1236 1237 1238 1239 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1240 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1241 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1242 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1243 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1244 if (clazz_jh == NULL || results_jh == NULL) return -1; 1245 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); 1246 1247 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1248 if (results.is_null() || !results->is_objArray()) return -1; 1249 1250 TempNewSymbol name = NULL; 1251 TempNewSymbol sig = NULL; 1252 if (name_jh != NULL) { 1253 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1254 if (name == NULL) return 0; // a match is not possible 1255 } 1256 if (sig_jh != NULL) { 1257 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1258 if (sig == NULL) return 0; // a match is not possible 1259 } 1260 1261 KlassHandle caller; 1262 if (caller_jh != NULL) { 1263 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1264 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1265 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); 1266 } 1267 1268 if (name != NULL && sig != NULL && results.not_null()) { 1269 // try a direct resolve 1270 // %%% TO DO 1271 } 1272 1273 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1274 caller, skip, results); 1275 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1276 return res; 1277 } 1278 JVM_END 1279 1280 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1281 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1282 Handle target (THREAD, JNIHandles::resolve(target_jh)); 1283 { 1284 // Walk all nmethods depending on this call site. 1285 MutexLocker mu(Compile_lock, thread); 1286 Universe::flush_dependents_on(call_site, target); 1287 java_lang_invoke_CallSite::set_target(call_site(), target()); 1288 } 1289 } 1290 JVM_END 1291 1292 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1293 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1294 Handle target (THREAD, JNIHandles::resolve(target_jh)); 1295 { 1296 // Walk all nmethods depending on this call site. 1297 MutexLocker mu(Compile_lock, thread); 1298 Universe::flush_dependents_on(call_site, target); 1299 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1300 } 1301 } 1302 JVM_END 1303 1304 /** 1305 * Throws a java/lang/UnsupportedOperationException unconditionally. 1306 * This is required by the specification of MethodHandle.invoke if 1307 * invoked directly. 1308 */ 1309 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1310 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1311 return NULL; 1312 } 1313 JVM_END 1314 1315 /** 1316 * Throws a java/lang/UnsupportedOperationException unconditionally. 1317 * This is required by the specification of MethodHandle.invokeExact if 1318 * invoked directly. 1319 */ 1320 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1321 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1322 return NULL; 1323 } 1324 JVM_END 1325 1326 /// JVM_RegisterMethodHandleMethods 1327 1328 #undef CS // Solaris builds complain 1329 1330 #define LANG "Ljava/lang/" 1331 #define JLINV "Ljava/lang/invoke/" 1332 1333 #define OBJ LANG"Object;" 1334 #define CLS LANG"Class;" 1335 #define STRG LANG"String;" 1336 #define CS JLINV"CallSite;" 1337 #define MT JLINV"MethodType;" 1338 #define MH JLINV"MethodHandle;" 1339 #define MEM JLINV"MemberName;" 1340 1341 #define CC (char*) /*cast a literal from (const char*)*/ 1342 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1343 1344 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1345 static JNINativeMethod MHN_methods[] = { 1346 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)}, 1347 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)}, 1348 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)}, 1349 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)}, 1350 // static native int getNamedCon(int which, Object[] name) 1351 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)}, 1352 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1353 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1354 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}, 1355 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)}, 1356 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1357 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1358 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)}, 1359 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)}, 1360 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)} 1361 }; 1362 1363 static JNINativeMethod MH_methods[] = { 1364 // UnsupportedOperationException throwers 1365 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)}, 1366 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)} 1367 }; 1368 1369 /** 1370 * Helper method to register native methods. 1371 */ 1372 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1373 int status = env->RegisterNatives(clazz, methods, nMethods); 1374 if (status != JNI_OK || env->ExceptionOccurred()) { 1375 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 1376 env->ExceptionClear(); 1377 return false; 1378 } 1379 return true; 1380 } 1381 1382 /** 1383 * This one function is exported, used by NativeLookup. 1384 */ 1385 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1386 if (!EnableInvokeDynamic) { 1387 warning("JSR 292 is disabled in this JVM. Use -XX:+UnlockDiagnosticVMOptions -XX:+EnableInvokeDynamic to enable."); 1388 return; // bind nothing 1389 } 1390 1391 assert(!MethodHandles::enabled(), "must not be enabled"); 1392 bool enable_MH = true; 1393 1394 jclass MH_class = NULL; 1395 if (SystemDictionary::MethodHandle_klass() == NULL) { 1396 enable_MH = false; 1397 } else { 1398 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1399 MH_class = (jclass) JNIHandles::make_local(env, mirror); 1400 } 1401 1402 if (enable_MH) { 1403 ThreadToNativeFromVM ttnfv(thread); 1404 1405 if (enable_MH) { 1406 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1407 } 1408 if (enable_MH) { 1409 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1410 } 1411 } 1412 1413 if (TraceInvokeDynamic) { 1414 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1415 } 1416 1417 if (enable_MH) { 1418 MethodHandles::generate_adapters(); 1419 MethodHandles::set_enabled(true); 1420 } 1421 } 1422 JVM_END