1 /* 2 * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "classfile/javaClasses.inline.hpp" 27 #include "classfile/stringTable.hpp" 28 #include "code/codeCache.hpp" 29 #include "compiler/compileBroker.hpp" 30 #include "interpreter/interpreter.hpp" 31 #include "interpreter/oopMapCache.hpp" 32 #include "interpreter/linkResolver.hpp" 33 #include "memory/allocation.inline.hpp" 34 #include "memory/oopFactory.hpp" 35 #include "oops/objArrayOop.inline.hpp" 36 #include "oops/oop.inline.hpp" 37 #include "prims/methodHandles.hpp" 38 #include "runtime/compilationPolicy.hpp" 39 #include "runtime/javaCalls.hpp" 40 #include "runtime/reflection.hpp" 41 #include "runtime/signature.hpp" 42 #include "runtime/stubRoutines.hpp" 43 #include "utilities/exceptions.hpp" 44 45 46 /* 47 * JSR 292 reference implementation: method handles 48 * The JDK 7 reference implementation represented method handle 49 * combinations as chains. Each link in the chain had a "vmentry" 50 * field which pointed at a bit of assembly code which performed 51 * one transformation before dispatching to the next link in the chain. 52 * 53 * The current reference implementation pushes almost all code generation 54 * responsibility to (trusted) Java code. A method handle contains a 55 * pointer to its "LambdaForm", which embodies all details of the method 56 * handle's behavior. The LambdaForm is a normal Java object, managed 57 * by a runtime coded in Java. 58 */ 59 60 bool MethodHandles::_enabled = false; // set true after successful native linkage 61 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 62 63 64 /** 65 * Generates method handle adapters. Returns 'false' if memory allocation 66 * failed and true otherwise. 67 */ 68 bool MethodHandles::generate_adapters() { 69 if (SystemDictionary::MethodHandle_klass() == NULL) { 70 return true; 71 } 72 73 assert(_adapter_code == NULL, "generate only once"); 74 75 ResourceMark rm; 76 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); 77 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 78 if (_adapter_code == NULL) { 79 return false; 80 } 81 82 CodeBuffer code(_adapter_code); 83 MethodHandlesAdapterGenerator g(&code); 84 g.generate(); 85 code.log_section_sizes("MethodHandlesAdapterBlob"); 86 return true; 87 } 88 89 //------------------------------------------------------------------------------ 90 // MethodHandlesAdapterGenerator::generate 91 // 92 void MethodHandlesAdapterGenerator::generate() { 93 // Generate generic method handle adapters. 94 // Generate interpreter entries 95 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 96 mk <= Interpreter::method_handle_invoke_LAST; 97 mk = Interpreter::MethodKind(1 + (int)mk)) { 98 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 99 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 100 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 101 if (entry != NULL) { 102 Interpreter::set_entry_for_kind(mk, entry); 103 } 104 // If the entry is not set, it will throw AbstractMethodError. 105 } 106 } 107 108 void MethodHandles::set_enabled(bool z) { 109 if (_enabled != z) { 110 guarantee(z, "can only enable once"); 111 _enabled = z; 112 } 113 } 114 115 // MemberName support 116 117 // import java_lang_invoke_MemberName.* 118 enum { 119 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 120 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 121 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 122 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 123 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 124 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 125 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 126 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 127 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 128 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 129 }; 130 131 Handle MethodHandles::new_MemberName(TRAPS) { 132 Handle empty; 133 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 134 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 135 return Handle(THREAD, k->allocate_instance(THREAD)); 136 } 137 138 oop MethodHandles::init_MemberName(Handle mname, Handle target) { 139 // This method is used from java.lang.invoke.MemberName constructors. 140 // It fills in the new MemberName from a java.lang.reflect.Member. 141 Thread* thread = Thread::current(); 142 oop target_oop = target(); 143 Klass* target_klass = target_oop->klass(); 144 if (target_klass == SystemDictionary::reflect_Field_klass()) { 145 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 146 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 147 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 148 if (!k.is_null() && k->oop_is_instance()) { 149 fieldDescriptor fd(InstanceKlass::cast(k()), slot); 150 oop mname2 = init_field_MemberName(mname, fd); 151 if (mname2 != NULL) { 152 // Since we have the reified name and type handy, add them to the result. 153 if (java_lang_invoke_MemberName::name(mname2) == NULL) 154 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 155 if (java_lang_invoke_MemberName::type(mname2) == NULL) 156 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 157 } 158 return mname2; 159 } 160 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 161 oop clazz = java_lang_reflect_Method::clazz(target_oop); 162 int slot = java_lang_reflect_Method::slot(target_oop); 163 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 164 if (!k.is_null() && k->oop_is_instance()) { 165 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 166 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 167 return NULL; // do not resolve unless there is a concrete signature 168 CallInfo info(m, k()); 169 return init_method_MemberName(mname, info); 170 } 171 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 172 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 173 int slot = java_lang_reflect_Constructor::slot(target_oop); 174 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 175 if (!k.is_null() && k->oop_is_instance()) { 176 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 177 if (m == NULL) return NULL; 178 CallInfo info(m, k()); 179 return init_method_MemberName(mname, info); 180 } 181 } 182 return NULL; 183 } 184 185 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 186 assert(info.resolved_appendix().is_null(), "only normal methods here"); 187 methodHandle m = info.resolved_method(); 188 KlassHandle m_klass = m->method_holder(); 189 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 190 int vmindex = Method::invalid_vtable_index; 191 192 switch (info.call_kind()) { 193 case CallInfo::itable_call: 194 vmindex = info.itable_index(); 195 // More importantly, the itable index only works with the method holder. 196 assert(m_klass->verify_itable_index(vmindex), ""); 197 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 198 if (TraceInvokeDynamic) { 199 ResourceMark rm; 200 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 201 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 202 vmindex); 203 m->access_flags().print_on(tty); 204 if (!m->is_abstract()) { 205 tty->print("default"); 206 } 207 tty->cr(); 208 } 209 break; 210 211 case CallInfo::vtable_call: 212 vmindex = info.vtable_index(); 213 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 214 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe"); 215 if (m_klass->is_interface()) { 216 // This is a vtable call to an interface method (abstract "miranda method" or default method). 217 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 218 // (LinkResolver should help us figure this out.) 219 KlassHandle m_klass_non_interface = info.resolved_klass(); 220 if (m_klass_non_interface->is_interface()) { 221 m_klass_non_interface = SystemDictionary::Object_klass(); 222 #ifdef ASSERT 223 { ResourceMark rm; 224 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex); 225 assert(m->name()->equals(m2->name()) && m->signature()->equals(m2->signature()), 226 err_msg("at %d, %s != %s", vmindex, 227 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string())); 228 } 229 #endif //ASSERT 230 } 231 if (!m->is_public()) { 232 assert(m->is_public(), "virtual call must be to public interface method"); 233 return NULL; // elicit an error later in product build 234 } 235 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe"); 236 m_klass = m_klass_non_interface; 237 } 238 if (TraceInvokeDynamic) { 239 ResourceMark rm; 240 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 241 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 242 m_klass->internal_name(), vmindex); 243 m->access_flags().print_on(tty); 244 if (m->is_default_method()) { 245 tty->print("default"); 246 } 247 tty->cr(); 248 } 249 break; 250 251 case CallInfo::direct_call: 252 vmindex = Method::nonvirtual_vtable_index; 253 if (m->is_static()) { 254 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 255 } else if (m->is_initializer()) { 256 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 257 } else { 258 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 259 } 260 break; 261 262 default: assert(false, "bad CallInfo"); return NULL; 263 } 264 265 // @CallerSensitive annotation detected 266 if (m->caller_sensitive()) { 267 flags |= CALLER_SENSITIVE; 268 } 269 270 oop mname_oop = mname(); 271 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 272 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); 273 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 274 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror()); 275 // Note: name and type can be lazily computed by resolve_MemberName, 276 // if Java code needs them as resolved String and MethodType objects. 277 // The clazz must be eagerly stored, because it provides a GC 278 // root to help keep alive the Method*. 279 // If relevant, the vtable or itable value is stored as vmindex. 280 // This is done eagerly, since it is readily available without 281 // constructing any new objects. 282 // TO DO: maybe intern mname_oop 283 if (m->method_holder()->add_member_name(mname)) { 284 return mname(); 285 } else { 286 // Redefinition caused this to fail. Return NULL (and an exception?) 287 return NULL; 288 } 289 } 290 291 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 292 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 293 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 294 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 295 Metadata* vmtarget = fd.field_holder(); 296 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 297 oop mname_oop = mname(); 298 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 299 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 300 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 301 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); 302 oop type = field_signature_type_or_null(fd.signature()); 303 oop name = field_name_or_null(fd.name()); 304 if (name != NULL) 305 java_lang_invoke_MemberName::set_name(mname_oop, name); 306 if (type != NULL) 307 java_lang_invoke_MemberName::set_type(mname_oop, type); 308 // Note: name and type can be lazily computed by resolve_MemberName, 309 // if Java code needs them as resolved String and Class objects. 310 // Note that the incoming type oop might be pre-resolved (non-null). 311 // The base clazz and field offset (vmindex) must be eagerly stored, 312 // because they unambiguously identify the field. 313 // Although the fieldDescriptor::_index would also identify the field, 314 // we do not use it, because it is harder to decode. 315 // TO DO: maybe intern mname_oop 316 return mname(); 317 } 318 319 // JVM 2.9 Special Methods: 320 // A method is signature polymorphic if and only if all of the following conditions hold : 321 // * It is declared in the java.lang.invoke.MethodHandle class. 322 // * It has a single formal parameter of type Object[]. 323 // * It has a return type of Object. 324 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 325 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 326 if (klass == NULL) 327 return false; 328 // The following test will fail spuriously during bootstrap of MethodHandle itself: 329 // if (klass != SystemDictionary::MethodHandle_klass()) 330 // Test the name instead: 331 if (klass->name()->not_equals(vmSymbols::java_lang_invoke_MethodHandle())) 332 return false; 333 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 334 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig); 335 if (m == NULL) return false; 336 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 337 int flags = m->access_flags().as_int(); 338 return (flags & required) == required; 339 } 340 341 342 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 343 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid)); 344 switch (iid) { 345 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 346 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 347 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 348 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 349 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 350 } 351 assert(false, ""); 352 return 0; 353 } 354 355 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 356 switch (iid) { 357 case vmIntrinsics::_invokeBasic: return 0; 358 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 359 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 360 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 361 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 362 } 363 assert(false, err_msg("iid=%d", iid)); 364 return 0; 365 } 366 367 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 368 vmSymbols::SID name_id = vmSymbols::find_sid(name); 369 switch (name_id) { 370 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 371 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 372 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 373 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 374 375 // There is one static signature-polymorphic method for each JVM invocation mode. 376 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 377 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 378 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 379 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 380 } 381 382 // Cover the case of invokeExact and any future variants of invokeFoo. 383 Klass* mh_klass = SystemDictionary::well_known_klass( 384 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 385 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) 386 return vmIntrinsics::_invokeGeneric; 387 388 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 389 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 390 return vmIntrinsics::_none; 391 } 392 393 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 394 if (klass != NULL && 395 klass->name()->equals(vmSymbols::java_lang_invoke_MethodHandle())) { 396 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 397 if (iid != vmIntrinsics::_none) 398 return iid; 399 if (is_method_handle_invoke_name(klass, name)) 400 return vmIntrinsics::_invokeGeneric; 401 } 402 return vmIntrinsics::_none; 403 } 404 405 406 // convert the external string or reflective type to an internal signature 407 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 408 if (java_lang_invoke_MethodType::is_instance(type_str)) { 409 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 410 } else if (java_lang_Class::is_instance(type_str)) { 411 return java_lang_Class::as_signature(type_str, false, THREAD); 412 } else if (java_lang_String::is_instance_inlined(type_str)) { 413 if (intern_if_not_found) { 414 return java_lang_String::as_symbol(type_str, THREAD); 415 } else { 416 return java_lang_String::as_symbol_or_null(type_str); 417 } 418 } else { 419 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 420 } 421 } 422 423 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 424 enum { OBJ_SIG_LEN = 18 }; 425 426 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 427 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 428 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 429 const int len = sig->utf8_length(); 430 for (int i = 0; i < len; i++) { 431 switch (sig->byte_at(i)) { 432 case 'L': 433 // only java/lang/Object is valid here 434 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 435 return false; 436 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 437 continue; 438 case '(': case ')': case 'V': 439 case 'I': case 'J': case 'F': case 'D': 440 continue; 441 //case '[': 442 //case 'Z': case 'B': case 'C': case 'S': 443 default: 444 return false; 445 } 446 } 447 return true; 448 } 449 450 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 451 Symbol* bsig = NULL; 452 if (sig == NULL) { 453 return sig; 454 } else if (is_basic_type_signature(sig)) { 455 sig->increment_refcount(); 456 return sig; // that was easy 457 } else if (sig->byte_at(0) != '(') { 458 BasicType bt = char2type(sig->byte_at(0)); 459 if (is_subword_type(bt)) { 460 bsig = vmSymbols::int_signature(); 461 } else { 462 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 463 bsig = vmSymbols::object_signature(); 464 } 465 } else { 466 ResourceMark rm; 467 stringStream buffer(128); 468 buffer.put('('); 469 int arg_pos = 0, keep_arg_pos = -1; 470 if (keep_last_arg) 471 keep_arg_pos = ArgumentCount(sig).size() - 1; 472 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 473 BasicType bt = ss.type(); 474 size_t this_arg_pos = buffer.size(); 475 if (ss.at_return_type()) { 476 buffer.put(')'); 477 } 478 if (arg_pos == keep_arg_pos) { 479 buffer.write((char*) ss.raw_bytes(), 480 (int) ss.raw_length()); 481 } else if (bt == T_OBJECT || bt == T_ARRAY) { 482 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 483 } else { 484 if (is_subword_type(bt)) 485 bt = T_INT; 486 buffer.put(type2char(bt)); 487 } 488 arg_pos++; 489 } 490 const char* sigstr = buffer.base(); 491 int siglen = (int) buffer.size(); 492 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 493 } 494 assert(is_basic_type_signature(bsig) || 495 // detune assert in case the injected argument is not a basic type: 496 keep_last_arg, ""); 497 return bsig; 498 } 499 500 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 501 Symbol* sig, 502 bool keep_arrays, 503 bool keep_basic_names) { 504 st = st ? st : tty; 505 int len = sig->utf8_length(); 506 int array = 0; 507 bool prev_type = false; 508 for (int i = 0; i < len; i++) { 509 char ch = sig->byte_at(i); 510 switch (ch) { 511 case '(': case ')': 512 prev_type = false; 513 st->put(ch); 514 continue; 515 case '[': 516 if (!keep_basic_names && keep_arrays) 517 st->put(ch); 518 array++; 519 continue; 520 case 'L': 521 { 522 if (prev_type) st->put(','); 523 int start = i+1, slash = start; 524 while (++i < len && (ch = sig->byte_at(i)) != ';') { 525 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 526 } 527 if (slash < i) start = slash; 528 if (!keep_basic_names) { 529 st->put('L'); 530 } else { 531 for (int j = start; j < i; j++) 532 st->put(sig->byte_at(j)); 533 prev_type = true; 534 } 535 break; 536 } 537 default: 538 { 539 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 540 ch = '['; 541 array = 0; 542 } 543 if (prev_type) st->put(','); 544 const char* n = NULL; 545 if (keep_basic_names) 546 n = type2name(char2type(ch)); 547 if (n == NULL) { 548 // unknown letter, or we don't want to know its name 549 st->put(ch); 550 } else { 551 st->print("%s", n); 552 prev_type = true; 553 } 554 break; 555 } 556 } 557 // Switch break goes here to take care of array suffix: 558 if (prev_type) { 559 while (array > 0) { 560 st->print("[]"); 561 --array; 562 } 563 } 564 array = 0; 565 } 566 } 567 568 569 570 static oop object_java_mirror() { 571 return SystemDictionary::Object_klass()->java_mirror(); 572 } 573 574 oop MethodHandles::field_name_or_null(Symbol* s) { 575 if (s == NULL) return NULL; 576 return StringTable::lookup(s); 577 } 578 579 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 580 if (s == NULL) return NULL; 581 BasicType bt = FieldType::basic_type(s); 582 if (is_java_primitive(bt)) { 583 assert(s->utf8_length() == 1, ""); 584 return java_lang_Class::primitive_mirror(bt); 585 } 586 // Here are some more short cuts for common types. 587 // They are optional, since reference types can be resolved lazily. 588 if (bt == T_OBJECT) { 589 if (s->equals(vmSymbols::object_signature())) { 590 return object_java_mirror(); 591 } else if (s->equals(vmSymbols::class_signature())) { 592 return SystemDictionary::Class_klass()->java_mirror(); 593 } else if (s->equals(vmSymbols::string_signature())) { 594 return SystemDictionary::String_klass()->java_mirror(); 595 } 596 } 597 return NULL; 598 } 599 600 601 // An unresolved member name is a mere symbolic reference. 602 // Resolving it plants a vmtarget/vmindex in it, 603 // which refers directly to JVM internals. 604 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) { 605 Handle empty; 606 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 607 608 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 609 // Already resolved. 610 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 611 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 612 return mname; 613 } 614 615 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 616 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 617 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 618 int flags = java_lang_invoke_MemberName::flags(mname()); 619 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 620 if (!ref_kind_is_valid(ref_kind)) { 621 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 622 } 623 624 DEBUG_ONLY(int old_vmindex); 625 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 626 627 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 628 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 629 } 630 631 instanceKlassHandle defc; 632 { 633 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 634 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 635 if (!defc_klass->oop_is_instance()) { 636 if (!defc_klass->oop_is_array()) return empty; 637 defc_klass = SystemDictionary::Object_klass(); 638 } 639 defc = instanceKlassHandle(THREAD, defc_klass); 640 } 641 if (defc.is_null()) { 642 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 643 } 644 defc->link_class(CHECK_(empty)); // possible safepoint 645 646 // convert the external string name to an internal symbol 647 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 648 if (name == NULL) return empty; // no such name 649 if (name == vmSymbols::class_initializer_name()) 650 return empty; // illegal name 651 652 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 653 if ((flags & ALL_KINDS) == IS_METHOD && 654 (defc() == SystemDictionary::MethodHandle_klass()) && 655 (ref_kind == JVM_REF_invokeVirtual || 656 ref_kind == JVM_REF_invokeSpecial || 657 // static invocation mode is required for _linkToVirtual, etc.: 658 ref_kind == JVM_REF_invokeStatic)) { 659 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 660 if (iid != vmIntrinsics::_none && 661 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 662 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 663 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 664 mh_invoke_id = iid; 665 } 666 } 667 668 // convert the external string or reflective type to an internal signature 669 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 670 if (type == NULL) return empty; // no such signature exists in the VM 671 672 // Time to do the lookup. 673 switch (flags & ALL_KINDS) { 674 case IS_METHOD: 675 { 676 CallInfo result; 677 { 678 assert(!HAS_PENDING_EXCEPTION, ""); 679 if (ref_kind == JVM_REF_invokeStatic) { 680 LinkResolver::resolve_static_call(result, 681 defc, name, type, caller, caller.not_null(), false, THREAD); 682 } else if (ref_kind == JVM_REF_invokeInterface) { 683 LinkResolver::resolve_interface_call(result, Handle(), defc, 684 defc, name, type, caller, caller.not_null(), false, THREAD); 685 } else if (mh_invoke_id != vmIntrinsics::_none) { 686 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 687 LinkResolver::resolve_handle_call(result, 688 defc, name, type, caller, THREAD); 689 } else if (ref_kind == JVM_REF_invokeSpecial) { 690 LinkResolver::resolve_special_call(result, 691 defc, name, type, caller, caller.not_null(), THREAD); 692 } else if (ref_kind == JVM_REF_invokeVirtual) { 693 LinkResolver::resolve_virtual_call(result, Handle(), defc, 694 defc, name, type, caller, caller.not_null(), false, THREAD); 695 } else { 696 assert(false, err_msg("ref_kind=%d", ref_kind)); 697 } 698 if (HAS_PENDING_EXCEPTION) { 699 return empty; 700 } 701 } 702 if (result.resolved_appendix().not_null()) { 703 // The resolved MemberName must not be accompanied by an appendix argument, 704 // since there is no way to bind this value into the MemberName. 705 // Caller is responsible to prevent this from happening. 706 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 707 } 708 oop mname2 = init_method_MemberName(mname, result); 709 return Handle(THREAD, mname2); 710 } 711 case IS_CONSTRUCTOR: 712 { 713 CallInfo result; 714 { 715 assert(!HAS_PENDING_EXCEPTION, ""); 716 if (name == vmSymbols::object_initializer_name()) { 717 LinkResolver::resolve_special_call(result, 718 defc, name, type, caller, caller.not_null(), THREAD); 719 } else { 720 break; // will throw after end of switch 721 } 722 if (HAS_PENDING_EXCEPTION) { 723 return empty; 724 } 725 } 726 assert(result.is_statically_bound(), ""); 727 oop mname2 = init_method_MemberName(mname, result); 728 return Handle(THREAD, mname2); 729 } 730 case IS_FIELD: 731 { 732 fieldDescriptor result; // find_field initializes fd if found 733 { 734 assert(!HAS_PENDING_EXCEPTION, ""); 735 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD); 736 if (HAS_PENDING_EXCEPTION) { 737 return empty; 738 } 739 } 740 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 741 return Handle(THREAD, mname2); 742 } 743 default: 744 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 745 } 746 747 return empty; 748 } 749 750 // Conversely, a member name which is only initialized from JVM internals 751 // may have null defc, name, and type fields. 752 // Resolving it plants a vmtarget/vmindex in it, 753 // which refers directly to JVM internals. 754 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 755 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 756 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 757 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 758 if (vmtarget == NULL) { 759 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 760 } 761 762 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 763 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 764 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 765 int flags = java_lang_invoke_MemberName::flags(mname()); 766 767 if (suppress != 0) { 768 if (suppress & _suppress_defc) have_defc = true; 769 if (suppress & _suppress_name) have_name = true; 770 if (suppress & _suppress_type) have_type = true; 771 } 772 773 if (have_defc && have_name && have_type) return; // nothing needed 774 775 switch (flags & ALL_KINDS) { 776 case IS_METHOD: 777 case IS_CONSTRUCTOR: 778 { 779 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 780 methodHandle m(THREAD, (Method*)vmtarget); 781 DEBUG_ONLY(vmtarget = NULL); // safety 782 if (m.is_null()) break; 783 if (!have_defc) { 784 InstanceKlass* defc = m->method_holder(); 785 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 786 } 787 if (!have_name) { 788 //not java_lang_String::create_from_symbol; let's intern member names 789 Handle name = StringTable::intern(m->name(), CHECK); 790 java_lang_invoke_MemberName::set_name(mname(), name()); 791 } 792 if (!have_type) { 793 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 794 java_lang_invoke_MemberName::set_type(mname(), type()); 795 } 796 return; 797 } 798 case IS_FIELD: 799 { 800 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 801 if (!((Klass*) vmtarget)->oop_is_instance()) break; 802 instanceKlassHandle defc(THREAD, (Klass*) vmtarget); 803 DEBUG_ONLY(vmtarget = NULL); // safety 804 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 805 fieldDescriptor fd; // find_field initializes fd if found 806 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 807 break; // cannot expand 808 if (!have_defc) { 809 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 810 } 811 if (!have_name) { 812 //not java_lang_String::create_from_symbol; let's intern member names 813 Handle name = StringTable::intern(fd.name(), CHECK); 814 java_lang_invoke_MemberName::set_name(mname(), name()); 815 } 816 if (!have_type) { 817 // If it is a primitive field type, don't mess with short strings like "I". 818 Handle type = field_signature_type_or_null(fd.signature()); 819 if (type.is_null()) { 820 java_lang_String::create_from_symbol(fd.signature(), CHECK); 821 } 822 java_lang_invoke_MemberName::set_type(mname(), type()); 823 } 824 return; 825 } 826 } 827 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 828 } 829 830 int MethodHandles::find_MemberNames(KlassHandle k, 831 Symbol* name, Symbol* sig, 832 int mflags, KlassHandle caller, 833 int skip, objArrayHandle results) { 834 // %%% take caller into account! 835 836 Thread* thread = Thread::current(); 837 838 if (k.is_null() || !k->oop_is_instance()) return -1; 839 840 int rfill = 0, rlimit = results->length(), rskip = skip; 841 // overflow measurement: 842 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 843 844 int match_flags = mflags; 845 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 846 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 847 bool local_only = !(search_superc | search_intfc); 848 bool classes_only = false; 849 850 if (name != NULL) { 851 if (name->utf8_length() == 0) return 0; // a match is not possible 852 } 853 if (sig != NULL) { 854 if (sig->utf8_length() == 0) return 0; // a match is not possible 855 if (sig->byte_at(0) == '(') 856 match_flags &= ~(IS_FIELD | IS_TYPE); 857 else 858 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 859 } 860 861 if ((match_flags & IS_TYPE) != 0) { 862 // NYI, and Core Reflection works quite well for this query 863 } 864 865 if ((match_flags & IS_FIELD) != 0) { 866 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 867 if (name != NULL && st.name()->not_equals(name)) 868 continue; 869 if (sig != NULL && st.signature()->not_equals(sig)) 870 continue; 871 // passed the filters 872 if (rskip > 0) { 873 --rskip; 874 } else if (rfill < rlimit) { 875 Handle result(thread, results->obj_at(rfill++)); 876 if (!java_lang_invoke_MemberName::is_instance(result())) 877 return -99; // caller bug! 878 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 879 if (saved != result()) 880 results->obj_at_put(rfill-1, saved); // show saved instance to user 881 } else if (++overflow >= overflow_limit) { 882 match_flags = 0; break; // got tired of looking at overflow 883 } 884 } 885 } 886 887 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 888 // watch out for these guys: 889 Symbol* init_name = vmSymbols::object_initializer_name(); 890 Symbol* clinit_name = vmSymbols::class_initializer_name(); 891 if (name->equals(clinit_name)) clinit_name = NULL; // hack for exposing <clinit> 892 bool negate_name_test = false; 893 // fix name so that it captures the intention of IS_CONSTRUCTOR 894 if (!(match_flags & IS_METHOD)) { 895 // constructors only 896 if (name == NULL) { 897 name = init_name; 898 } else if (name->not_equals(init_name)) { 899 return 0; // no constructors of this method name 900 } 901 } else if (!(match_flags & IS_CONSTRUCTOR)) { 902 // methods only 903 if (name == NULL) { 904 name = init_name; 905 negate_name_test = true; // if we see the name, we *omit* the entry 906 } else if (name->equals(init_name)) { 907 return 0; // no methods of this constructor name 908 } 909 } else { 910 // caller will accept either sort; no need to adjust name 911 } 912 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 913 Method* m = st.method(); 914 Symbol* m_name = m->name(); 915 if (m_name->equals(clinit_name)) 916 continue; 917 if (name->not_equals(NULL) && ((m_name->not_equals(name)) ^ negate_name_test)) 918 continue; 919 if (sig->not_equals(NULL) && m->signature()->not_equals(sig)) 920 continue; 921 // passed the filters 922 if (rskip > 0) { 923 --rskip; 924 } else if (rfill < rlimit) { 925 Handle result(thread, results->obj_at(rfill++)); 926 if (!java_lang_invoke_MemberName::is_instance(result())) 927 return -99; // caller bug! 928 CallInfo info(m); 929 oop saved = MethodHandles::init_method_MemberName(result, info); 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(jweak mem_name_wref) { 962 assert_locked_or_safepoint(MemberNameTable_lock); 963 this->push(mem_name_wref); 964 } 965 966 #if INCLUDE_JVMTI 967 // It is called at safepoint only for RedefineClasses 968 void MemberNameTable::adjust_method_entries(Method** old_methods, Method** new_methods, 969 int methods_length, bool *trace_name_printed) { 970 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 971 // For each redefined method 972 for (int j = 0; j < methods_length; j++) { 973 Method* old_method = old_methods[j]; 974 Method* new_method = new_methods[j]; 975 976 // search the MemberNameTable for uses of either obsolete or EMCP methods 977 for (int idx = 0; idx < length(); idx++) { 978 oop mem_name = JNIHandles::resolve(this->at(idx)); 979 if (mem_name != NULL) { 980 java_lang_invoke_MemberName::adjust_vmtarget(mem_name, old_method, new_method, 981 trace_name_printed); 982 } 983 } 984 } 985 } 986 #endif // INCLUDE_JVMTI 987 988 // 989 // Here are the native methods in java.lang.invoke.MethodHandleNatives 990 // They are the private interface between this JVM and the HotSpot-specific 991 // Java code that implements JSR 292 method handles. 992 // 993 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 994 // that intrinsic (non-JNI) native methods are defined in HotSpot. 995 // 996 997 JVM_ENTRY(jint, MHN_getConstant(JNIEnv *env, jobject igcls, jint which)) { 998 switch (which) { 999 case MethodHandles::GC_COUNT_GWT: 1000 #ifdef COMPILER2 1001 return true; 1002 #else 1003 return false; 1004 #endif 1005 } 1006 return 0; 1007 } 1008 JVM_END 1009 1010 #ifndef PRODUCT 1011 #define EACH_NAMED_CON(template, requirement) \ 1012 template(MethodHandles,GC_COUNT_GWT) \ 1013 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1014 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1015 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1016 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1017 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1018 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1019 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1020 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1021 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1022 template(MethodHandles,GC_LAMBDA_SUPPORT) \ 1023 /*end*/ 1024 1025 #define IGNORE_REQ(req_expr) /* req_expr */ 1026 #define ONE_PLUS(scope,value) 1+ 1027 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1028 #define VALUE_COMMA(scope,value) scope::value, 1029 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1030 #define STRING_NULL(scope,value) #value "\0" 1031 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1032 1033 static bool advertise_con_value(int which) { 1034 if (which < 0) return false; 1035 bool ok = true; 1036 int count = 0; 1037 #define INC_COUNT(scope,value) \ 1038 ++count; 1039 #define CHECK_REQ(req_expr) \ 1040 if (which < count) return ok; \ 1041 ok = (req_expr); 1042 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1043 #undef INC_COUNT 1044 #undef CHECK_REQ 1045 assert(count == con_value_count, ""); 1046 if (which < count) return ok; 1047 return false; 1048 } 1049 1050 #undef ONE_PLUS 1051 #undef VALUE_COMMA 1052 #undef STRING_NULL 1053 #undef EACH_NAMED_CON 1054 #endif // PRODUCT 1055 1056 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1057 #ifndef PRODUCT 1058 if (advertise_con_value(which)) { 1059 assert(which >= 0 && which < con_value_count, ""); 1060 int con = con_values[which]; 1061 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1062 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1063 const char* str = &con_names[0]; 1064 for (int i = 0; i < which; i++) 1065 str += strlen(str) + 1; // skip name and null 1066 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1067 box->obj_at_put(0, name); 1068 } 1069 return con; 1070 } 1071 #endif 1072 return 0; 1073 } 1074 JVM_END 1075 1076 // void init(MemberName self, AccessibleObject ref) 1077 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1078 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1079 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1080 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1081 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1082 MethodHandles::init_MemberName(mname, target); 1083 } 1084 JVM_END 1085 1086 // void expand(MemberName self) 1087 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1088 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1089 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1090 MethodHandles::expand_MemberName(mname, 0, CHECK); 1091 } 1092 JVM_END 1093 1094 // void resolve(MemberName self, Class<?> caller) 1095 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1096 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1097 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1098 1099 // The trusted Java code that calls this method should already have performed 1100 // access checks on behalf of the given caller. But, we can verify this. 1101 if (VerifyMethodHandles && caller_jh != NULL && 1102 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1103 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1104 if (reference_klass != NULL && reference_klass->oop_is_objArray()) { 1105 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1106 } 1107 1108 // Reflection::verify_class_access can only handle instance classes. 1109 if (reference_klass != NULL && reference_klass->oop_is_instance()) { 1110 // Emulate LinkResolver::check_klass_accessability. 1111 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1112 if (!Reflection::verify_class_access(caller, 1113 reference_klass, 1114 true)) { 1115 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1116 } 1117 } 1118 } 1119 1120 KlassHandle caller(THREAD, 1121 caller_jh == NULL ? (Klass*) NULL : 1122 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh))); 1123 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1124 1125 if (resolved.is_null()) { 1126 int flags = java_lang_invoke_MemberName::flags(mname()); 1127 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1128 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1129 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1130 } 1131 if ((flags & ALL_KINDS) == IS_FIELD) { 1132 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); 1133 } else if ((flags & ALL_KINDS) == IS_METHOD || 1134 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1135 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); 1136 } else { 1137 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1138 } 1139 } 1140 1141 return JNIHandles::make_local(THREAD, resolved()); 1142 } 1143 JVM_END 1144 1145 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1146 if (mname == NULL || 1147 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1148 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1149 } else { 1150 int flags = java_lang_invoke_MemberName::flags(mname); 1151 if ((flags & IS_FIELD) != 0 && 1152 (must_be_static 1153 ? (flags & JVM_ACC_STATIC) != 0 1154 : (flags & JVM_ACC_STATIC) == 0)) { 1155 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1156 return (jlong) vmindex; 1157 } 1158 } 1159 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1160 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1161 return 0; 1162 } 1163 1164 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1165 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1166 } 1167 JVM_END 1168 1169 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1170 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1171 } 1172 JVM_END 1173 1174 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1175 // use the other function to perform sanity checks: 1176 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1177 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1178 return JNIHandles::make_local(THREAD, clazz); 1179 } 1180 JVM_END 1181 1182 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1183 if (mname_jh == NULL) return NULL; 1184 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1185 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1186 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1187 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1188 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1189 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1190 result->obj_at_put(0, x); 1191 x = NULL; 1192 if (vmtarget == NULL) { 1193 x = NULL; 1194 } else if (vmtarget->is_klass()) { 1195 x = ((Klass*) vmtarget)->java_mirror(); 1196 } else if (vmtarget->is_method()) { 1197 x = mname(); 1198 } 1199 result->obj_at_put(1, x); 1200 return JNIHandles::make_local(env, result()); 1201 } 1202 JVM_END 1203 1204 1205 1206 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1207 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1208 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1209 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1210 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1211 if (clazz_jh == NULL || results_jh == NULL) return -1; 1212 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); 1213 1214 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1215 if (results.is_null() || !results->is_objArray()) return -1; 1216 1217 TempNewSymbol name = NULL; 1218 TempNewSymbol sig = NULL; 1219 if (name_jh != NULL) { 1220 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1221 if (name == NULL) return 0; // a match is not possible 1222 } 1223 if (sig_jh != NULL) { 1224 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1225 if (sig == NULL) return 0; // a match is not possible 1226 } 1227 1228 KlassHandle caller; 1229 if (caller_jh != NULL) { 1230 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1231 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1232 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); 1233 } 1234 1235 if (name != NULL && sig != NULL && results.not_null()) { 1236 // try a direct resolve 1237 // %%% TO DO 1238 } 1239 1240 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1241 caller, skip, results); 1242 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1243 return res; 1244 } 1245 JVM_END 1246 1247 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1248 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1249 Handle target (THREAD, JNIHandles::resolve(target_jh)); 1250 { 1251 // Walk all nmethods depending on this call site. 1252 MutexLocker mu(Compile_lock, thread); 1253 CodeCache::flush_dependents_on(call_site, target); 1254 java_lang_invoke_CallSite::set_target(call_site(), target()); 1255 } 1256 } 1257 JVM_END 1258 1259 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1260 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1261 Handle target (THREAD, JNIHandles::resolve(target_jh)); 1262 { 1263 // Walk all nmethods depending on this call site. 1264 MutexLocker mu(Compile_lock, thread); 1265 CodeCache::flush_dependents_on(call_site, target); 1266 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1267 } 1268 } 1269 JVM_END 1270 1271 /** 1272 * Throws a java/lang/UnsupportedOperationException unconditionally. 1273 * This is required by the specification of MethodHandle.invoke if 1274 * invoked directly. 1275 */ 1276 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1277 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1278 return NULL; 1279 } 1280 JVM_END 1281 1282 /** 1283 * Throws a java/lang/UnsupportedOperationException unconditionally. 1284 * This is required by the specification of MethodHandle.invokeExact if 1285 * invoked directly. 1286 */ 1287 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1288 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1289 return NULL; 1290 } 1291 JVM_END 1292 1293 /// JVM_RegisterMethodHandleMethods 1294 1295 #undef CS // Solaris builds complain 1296 1297 #define LANG "Ljava/lang/" 1298 #define JLINV "Ljava/lang/invoke/" 1299 1300 #define OBJ LANG"Object;" 1301 #define CLS LANG"Class;" 1302 #define STRG LANG"String;" 1303 #define CS JLINV"CallSite;" 1304 #define MT JLINV"MethodType;" 1305 #define MH JLINV"MethodHandle;" 1306 #define MEM JLINV"MemberName;" 1307 1308 #define CC (char*) /*cast a literal from (const char*)*/ 1309 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1310 1311 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1312 static JNINativeMethod MHN_methods[] = { 1313 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)}, 1314 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)}, 1315 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)}, 1316 {CC"getConstant", CC"(I)I", FN_PTR(MHN_getConstant)}, 1317 // static native int getNamedCon(int which, Object[] name) 1318 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)}, 1319 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1320 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1321 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}, 1322 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)}, 1323 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1324 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1325 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)}, 1326 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)}, 1327 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)} 1328 }; 1329 1330 static JNINativeMethod MH_methods[] = { 1331 // UnsupportedOperationException throwers 1332 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)}, 1333 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)} 1334 }; 1335 1336 /** 1337 * Helper method to register native methods. 1338 */ 1339 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1340 int status = env->RegisterNatives(clazz, methods, nMethods); 1341 if (status != JNI_OK || env->ExceptionOccurred()) { 1342 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 1343 env->ExceptionClear(); 1344 return false; 1345 } 1346 return true; 1347 } 1348 1349 /** 1350 * This one function is exported, used by NativeLookup. 1351 */ 1352 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1353 assert(!MethodHandles::enabled(), "must not be enabled"); 1354 bool enable_MH = true; 1355 1356 jclass MH_class = NULL; 1357 if (SystemDictionary::MethodHandle_klass() == NULL) { 1358 enable_MH = false; 1359 } else { 1360 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1361 MH_class = (jclass) JNIHandles::make_local(env, mirror); 1362 } 1363 1364 if (enable_MH) { 1365 ThreadToNativeFromVM ttnfv(thread); 1366 1367 if (enable_MH) { 1368 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1369 } 1370 if (enable_MH) { 1371 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1372 } 1373 } 1374 1375 if (TraceInvokeDynamic) { 1376 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1377 } 1378 1379 if (enable_MH) { 1380 if (MethodHandles::generate_adapters() == false) { 1381 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters"); 1382 } 1383 MethodHandles::set_enabled(true); 1384 } 1385 } 1386 JVM_END