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 "code/codeCacheExtensions.hpp" 30 #include "code/dependencyContext.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "interpreter/interpreter.hpp" 33 #include "interpreter/oopMapCache.hpp" 34 #include "interpreter/linkResolver.hpp" 35 #include "memory/allocation.inline.hpp" 36 #include "memory/oopFactory.hpp" 37 #include "oops/objArrayOop.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "prims/methodHandles.hpp" 40 #include "prims/jvmtiRedefineClassesTrace.hpp" 41 #include "runtime/compilationPolicy.hpp" 42 #include "runtime/javaCalls.hpp" 43 #include "runtime/reflection.hpp" 44 #include "runtime/signature.hpp" 45 #include "runtime/stubRoutines.hpp" 46 #include "utilities/exceptions.hpp" 47 48 49 /* 50 * JSR 292 reference implementation: method handles 51 * The JDK 7 reference implementation represented method handle 52 * combinations as chains. Each link in the chain had a "vmentry" 53 * field which pointed at a bit of assembly code which performed 54 * one transformation before dispatching to the next link in the chain. 55 * 56 * The current reference implementation pushes almost all code generation 57 * responsibility to (trusted) Java code. A method handle contains a 58 * pointer to its "LambdaForm", which embodies all details of the method 59 * handle's behavior. The LambdaForm is a normal Java object, managed 60 * by a runtime coded in Java. 61 */ 62 63 bool MethodHandles::_enabled = false; // set true after successful native linkage 64 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 65 66 67 /** 68 * Generates method handle adapters. Returns 'false' if memory allocation 69 * failed and true otherwise. 70 */ 71 bool MethodHandles::generate_adapters() { 72 if (SystemDictionary::MethodHandle_klass() == NULL) { 73 return true; 74 } 75 76 assert(_adapter_code == NULL, "generate only once"); 77 78 ResourceMark rm; 79 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); 80 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 81 if (_adapter_code == NULL) { 82 return false; 83 } 84 85 CodeBuffer code(_adapter_code); 86 MethodHandlesAdapterGenerator g(&code); 87 g.generate(); 88 code.log_section_sizes("MethodHandlesAdapterBlob"); 89 return true; 90 } 91 92 //------------------------------------------------------------------------------ 93 // MethodHandlesAdapterGenerator::generate 94 // 95 void MethodHandlesAdapterGenerator::generate() { 96 // Generate generic method handle adapters. 97 // Generate interpreter entries 98 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 99 mk <= Interpreter::method_handle_invoke_LAST; 100 mk = Interpreter::MethodKind(1 + (int)mk)) { 101 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 102 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 103 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 104 if (entry != NULL) { 105 CodeCacheExtensions::handle_generated_pc(entry, vmIntrinsics::name_at(iid)); 106 Interpreter::set_entry_for_kind(mk, entry); 107 } 108 // If the entry is not set, it will throw AbstractMethodError. 109 } 110 } 111 112 void MethodHandles::set_enabled(bool z) { 113 if (_enabled != z) { 114 guarantee(z, "can only enable once"); 115 _enabled = z; 116 } 117 } 118 119 // MemberName support 120 121 // import java_lang_invoke_MemberName.* 122 enum { 123 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 124 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 125 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 126 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 127 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 128 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 129 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 130 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 131 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 132 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 133 }; 134 135 Handle MethodHandles::new_MemberName(TRAPS) { 136 Handle empty; 137 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 138 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 139 return Handle(THREAD, k->allocate_instance(THREAD)); 140 } 141 142 oop MethodHandles::init_MemberName(Handle mname, Handle target) { 143 // This method is used from java.lang.invoke.MemberName constructors. 144 // It fills in the new MemberName from a java.lang.reflect.Member. 145 Thread* thread = Thread::current(); 146 oop target_oop = target(); 147 Klass* target_klass = target_oop->klass(); 148 if (target_klass == SystemDictionary::reflect_Field_klass()) { 149 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 150 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 151 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 152 if (!k.is_null() && k->is_instance_klass()) { 153 fieldDescriptor fd(InstanceKlass::cast(k()), slot); 154 oop mname2 = init_field_MemberName(mname, fd); 155 if (mname2 != NULL) { 156 // Since we have the reified name and type handy, add them to the result. 157 if (java_lang_invoke_MemberName::name(mname2) == NULL) 158 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 159 if (java_lang_invoke_MemberName::type(mname2) == NULL) 160 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 161 } 162 return mname2; 163 } 164 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 165 oop clazz = java_lang_reflect_Method::clazz(target_oop); 166 int slot = java_lang_reflect_Method::slot(target_oop); 167 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 168 if (!k.is_null() && k->is_instance_klass()) { 169 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 170 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 171 return NULL; // do not resolve unless there is a concrete signature 172 CallInfo info(m, k()); 173 return init_method_MemberName(mname, info); 174 } 175 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 176 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 177 int slot = java_lang_reflect_Constructor::slot(target_oop); 178 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 179 if (!k.is_null() && k->is_instance_klass()) { 180 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 181 if (m == NULL) return NULL; 182 CallInfo info(m, k()); 183 return init_method_MemberName(mname, info); 184 } 185 } 186 return NULL; 187 } 188 189 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 190 assert(info.resolved_appendix().is_null(), "only normal methods here"); 191 methodHandle m = info.resolved_method(); 192 assert(m.not_null(), "null method handle"); 193 KlassHandle m_klass = m->method_holder(); 194 assert(m.not_null(), "null holder for method handle"); 195 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 196 int vmindex = Method::invalid_vtable_index; 197 198 switch (info.call_kind()) { 199 case CallInfo::itable_call: 200 vmindex = info.itable_index(); 201 // More importantly, the itable index only works with the method holder. 202 assert(m_klass->verify_itable_index(vmindex), ""); 203 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 204 if (TraceInvokeDynamic) { 205 ResourceMark rm; 206 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 207 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 208 vmindex); 209 m->access_flags().print_on(tty); 210 if (!m->is_abstract()) { 211 tty->print("default"); 212 } 213 tty->cr(); 214 } 215 break; 216 217 case CallInfo::vtable_call: 218 vmindex = info.vtable_index(); 219 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 220 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe"); 221 if (m_klass->is_interface()) { 222 // This is a vtable call to an interface method (abstract "miranda method" or default method). 223 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 224 // (LinkResolver should help us figure this out.) 225 KlassHandle m_klass_non_interface = info.resolved_klass(); 226 if (m_klass_non_interface->is_interface()) { 227 m_klass_non_interface = SystemDictionary::Object_klass(); 228 #ifdef ASSERT 229 { ResourceMark rm; 230 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex); 231 assert(m->name() == m2->name() && m->signature() == m2->signature(), 232 "at %d, %s != %s", vmindex, 233 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 234 } 235 #endif //ASSERT 236 } 237 if (!m->is_public()) { 238 assert(m->is_public(), "virtual call must be to public interface method"); 239 return NULL; // elicit an error later in product build 240 } 241 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe"); 242 m_klass = m_klass_non_interface; 243 } 244 if (TraceInvokeDynamic) { 245 ResourceMark rm; 246 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 247 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 248 m_klass->internal_name(), vmindex); 249 m->access_flags().print_on(tty); 250 if (m->is_default_method()) { 251 tty->print("default"); 252 } 253 tty->cr(); 254 } 255 break; 256 257 case CallInfo::direct_call: 258 vmindex = Method::nonvirtual_vtable_index; 259 if (m->is_static()) { 260 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 261 } else if (m->is_initializer()) { 262 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 263 } else { 264 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 265 } 266 break; 267 268 default: assert(false, "bad CallInfo"); return NULL; 269 } 270 271 // @CallerSensitive annotation detected 272 if (m->caller_sensitive()) { 273 flags |= CALLER_SENSITIVE; 274 } 275 276 oop mname_oop = mname(); 277 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 278 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); 279 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 280 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror()); 281 // Note: name and type can be lazily computed by resolve_MemberName, 282 // if Java code needs them as resolved String and MethodType objects. 283 // The clazz must be eagerly stored, because it provides a GC 284 // root to help keep alive the Method*. 285 // If relevant, the vtable or itable value is stored as vmindex. 286 // This is done eagerly, since it is readily available without 287 // constructing any new objects. 288 // TO DO: maybe intern mname_oop 289 if (m->method_holder()->add_member_name(mname)) { 290 return mname(); 291 } else { 292 // Redefinition caused this to fail. Return NULL (and an exception?) 293 return NULL; 294 } 295 } 296 297 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 298 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 299 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 300 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 301 Metadata* vmtarget = fd.field_holder(); 302 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 303 oop mname_oop = mname(); 304 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 305 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 306 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 307 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); 308 oop type = field_signature_type_or_null(fd.signature()); 309 oop name = field_name_or_null(fd.name()); 310 if (name != NULL) 311 java_lang_invoke_MemberName::set_name(mname_oop, name); 312 if (type != NULL) 313 java_lang_invoke_MemberName::set_type(mname_oop, type); 314 // Note: name and type can be lazily computed by resolve_MemberName, 315 // if Java code needs them as resolved String and Class objects. 316 // Note that the incoming type oop might be pre-resolved (non-null). 317 // The base clazz and field offset (vmindex) must be eagerly stored, 318 // because they unambiguously identify the field. 319 // Although the fieldDescriptor::_index would also identify the field, 320 // we do not use it, because it is harder to decode. 321 // TO DO: maybe intern mname_oop 322 return mname(); 323 } 324 325 // JVM 2.9 Special Methods: 326 // A method is signature polymorphic if and only if all of the following conditions hold : 327 // * It is declared in the java.lang.invoke.MethodHandle class. 328 // * It has a single formal parameter of type Object[]. 329 // * It has a return type of Object. 330 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 331 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 332 if (klass == NULL) 333 return false; 334 // The following test will fail spuriously during bootstrap of MethodHandle itself: 335 // if (klass != SystemDictionary::MethodHandle_klass()) 336 // Test the name instead: 337 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle()) 338 return false; 339 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 340 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig); 341 if (m == NULL) return false; 342 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 343 int flags = m->access_flags().as_int(); 344 return (flags & required) == required; 345 } 346 347 348 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 349 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 350 switch (iid) { 351 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 352 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 353 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 354 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 355 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 356 } 357 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 358 return 0; 359 } 360 361 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 362 switch (iid) { 363 case vmIntrinsics::_invokeBasic: return 0; 364 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 365 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 366 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 367 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 368 } 369 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 370 return 0; 371 } 372 373 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 374 vmSymbols::SID name_id = vmSymbols::find_sid(name); 375 switch (name_id) { 376 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 377 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 378 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 379 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 380 381 // There is one static signature-polymorphic method for each JVM invocation mode. 382 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 383 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 384 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 385 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 386 } 387 388 // Cover the case of invokeExact and any future variants of invokeFoo. 389 Klass* mh_klass = SystemDictionary::well_known_klass( 390 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 391 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) 392 return vmIntrinsics::_invokeGeneric; 393 394 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 395 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 396 return vmIntrinsics::_none; 397 } 398 399 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 400 if (klass != NULL && 401 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) { 402 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 403 if (iid != vmIntrinsics::_none) 404 return iid; 405 if (is_method_handle_invoke_name(klass, name)) 406 return vmIntrinsics::_invokeGeneric; 407 } 408 return vmIntrinsics::_none; 409 } 410 411 412 // convert the external string or reflective type to an internal signature 413 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 414 if (java_lang_invoke_MethodType::is_instance(type_str)) { 415 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 416 } else if (java_lang_Class::is_instance(type_str)) { 417 return java_lang_Class::as_signature(type_str, false, THREAD); 418 } else if (java_lang_String::is_instance_inlined(type_str)) { 419 if (intern_if_not_found) { 420 return java_lang_String::as_symbol(type_str, THREAD); 421 } else { 422 return java_lang_String::as_symbol_or_null(type_str); 423 } 424 } else { 425 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 426 } 427 } 428 429 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 430 enum { OBJ_SIG_LEN = 18 }; 431 432 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 433 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 434 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 435 const int len = sig->utf8_length(); 436 for (int i = 0; i < len; i++) { 437 switch (sig->byte_at(i)) { 438 case 'L': 439 // only java/lang/Object is valid here 440 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 441 return false; 442 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 443 continue; 444 case '(': case ')': case 'V': 445 case 'I': case 'J': case 'F': case 'D': 446 continue; 447 //case '[': 448 //case 'Z': case 'B': case 'C': case 'S': 449 default: 450 return false; 451 } 452 } 453 return true; 454 } 455 456 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 457 Symbol* bsig = NULL; 458 if (sig == NULL) { 459 return sig; 460 } else if (is_basic_type_signature(sig)) { 461 sig->increment_refcount(); 462 return sig; // that was easy 463 } else if (sig->byte_at(0) != '(') { 464 BasicType bt = char2type(sig->byte_at(0)); 465 if (is_subword_type(bt)) { 466 bsig = vmSymbols::int_signature(); 467 } else { 468 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 469 bsig = vmSymbols::object_signature(); 470 } 471 } else { 472 ResourceMark rm; 473 stringStream buffer(128); 474 buffer.put('('); 475 int arg_pos = 0, keep_arg_pos = -1; 476 if (keep_last_arg) 477 keep_arg_pos = ArgumentCount(sig).size() - 1; 478 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 479 BasicType bt = ss.type(); 480 size_t this_arg_pos = buffer.size(); 481 if (ss.at_return_type()) { 482 buffer.put(')'); 483 } 484 if (arg_pos == keep_arg_pos) { 485 buffer.write((char*) ss.raw_bytes(), 486 (int) ss.raw_length()); 487 } else if (bt == T_OBJECT || bt == T_ARRAY) { 488 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 489 } else { 490 if (is_subword_type(bt)) 491 bt = T_INT; 492 buffer.put(type2char(bt)); 493 } 494 arg_pos++; 495 } 496 const char* sigstr = buffer.base(); 497 int siglen = (int) buffer.size(); 498 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 499 } 500 assert(is_basic_type_signature(bsig) || 501 // detune assert in case the injected argument is not a basic type: 502 keep_last_arg, ""); 503 return bsig; 504 } 505 506 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 507 Symbol* sig, 508 bool keep_arrays, 509 bool keep_basic_names) { 510 st = st ? st : tty; 511 int len = sig->utf8_length(); 512 int array = 0; 513 bool prev_type = false; 514 for (int i = 0; i < len; i++) { 515 char ch = sig->byte_at(i); 516 switch (ch) { 517 case '(': case ')': 518 prev_type = false; 519 st->put(ch); 520 continue; 521 case '[': 522 if (!keep_basic_names && keep_arrays) 523 st->put(ch); 524 array++; 525 continue; 526 case 'L': 527 { 528 if (prev_type) st->put(','); 529 int start = i+1, slash = start; 530 while (++i < len && (ch = sig->byte_at(i)) != ';') { 531 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 532 } 533 if (slash < i) start = slash; 534 if (!keep_basic_names) { 535 st->put('L'); 536 } else { 537 for (int j = start; j < i; j++) 538 st->put(sig->byte_at(j)); 539 prev_type = true; 540 } 541 break; 542 } 543 default: 544 { 545 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 546 ch = '['; 547 array = 0; 548 } 549 if (prev_type) st->put(','); 550 const char* n = NULL; 551 if (keep_basic_names) 552 n = type2name(char2type(ch)); 553 if (n == NULL) { 554 // unknown letter, or we don't want to know its name 555 st->put(ch); 556 } else { 557 st->print("%s", n); 558 prev_type = true; 559 } 560 break; 561 } 562 } 563 // Switch break goes here to take care of array suffix: 564 if (prev_type) { 565 while (array > 0) { 566 st->print("[]"); 567 --array; 568 } 569 } 570 array = 0; 571 } 572 } 573 574 575 576 static oop object_java_mirror() { 577 return SystemDictionary::Object_klass()->java_mirror(); 578 } 579 580 oop MethodHandles::field_name_or_null(Symbol* s) { 581 if (s == NULL) return NULL; 582 return StringTable::lookup(s); 583 } 584 585 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 586 if (s == NULL) return NULL; 587 BasicType bt = FieldType::basic_type(s); 588 if (is_java_primitive(bt)) { 589 assert(s->utf8_length() == 1, ""); 590 return java_lang_Class::primitive_mirror(bt); 591 } 592 // Here are some more short cuts for common types. 593 // They are optional, since reference types can be resolved lazily. 594 if (bt == T_OBJECT) { 595 if (s == vmSymbols::object_signature()) { 596 return object_java_mirror(); 597 } else if (s == vmSymbols::class_signature()) { 598 return SystemDictionary::Class_klass()->java_mirror(); 599 } else if (s == vmSymbols::string_signature()) { 600 return SystemDictionary::String_klass()->java_mirror(); 601 } 602 } 603 return NULL; 604 } 605 606 607 // An unresolved member name is a mere symbolic reference. 608 // Resolving it plants a vmtarget/vmindex in it, 609 // which refers directly to JVM internals. 610 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) { 611 Handle empty; 612 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 613 614 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 615 // Already resolved. 616 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 617 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 618 return mname; 619 } 620 621 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 622 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 623 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 624 int flags = java_lang_invoke_MemberName::flags(mname()); 625 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 626 if (!ref_kind_is_valid(ref_kind)) { 627 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 628 } 629 630 DEBUG_ONLY(int old_vmindex); 631 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 632 633 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 634 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 635 } 636 637 instanceKlassHandle defc; 638 { 639 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 640 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 641 if (!defc_klass->is_instance_klass()) { 642 if (!defc_klass->is_array_klass()) return empty; 643 defc_klass = SystemDictionary::Object_klass(); 644 } 645 defc = instanceKlassHandle(THREAD, defc_klass); 646 } 647 if (defc.is_null()) { 648 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 649 } 650 defc->link_class(CHECK_(empty)); // possible safepoint 651 652 // convert the external string name to an internal symbol 653 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 654 if (name == NULL) return empty; // no such name 655 if (name == vmSymbols::class_initializer_name()) 656 return empty; // illegal name 657 658 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 659 if ((flags & ALL_KINDS) == IS_METHOD && 660 (defc() == SystemDictionary::MethodHandle_klass()) && 661 (ref_kind == JVM_REF_invokeVirtual || 662 ref_kind == JVM_REF_invokeSpecial || 663 // static invocation mode is required for _linkToVirtual, etc.: 664 ref_kind == JVM_REF_invokeStatic)) { 665 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 666 if (iid != vmIntrinsics::_none && 667 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 668 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 669 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 670 mh_invoke_id = iid; 671 } 672 } 673 674 // convert the external string or reflective type to an internal signature 675 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 676 if (type == NULL) return empty; // no such signature exists in the VM 677 678 // Time to do the lookup. 679 switch (flags & ALL_KINDS) { 680 case IS_METHOD: 681 { 682 CallInfo result; 683 LinkInfo link_info(defc, name, type, caller, caller.not_null()); 684 { 685 assert(!HAS_PENDING_EXCEPTION, ""); 686 if (ref_kind == JVM_REF_invokeStatic) { 687 LinkResolver::resolve_static_call(result, 688 link_info, false, THREAD); 689 } else if (ref_kind == JVM_REF_invokeInterface) { 690 LinkResolver::resolve_interface_call(result, Handle(), defc, 691 link_info, false, THREAD); 692 } else if (mh_invoke_id != vmIntrinsics::_none) { 693 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 694 LinkResolver::resolve_handle_call(result, link_info, THREAD); 695 } else if (ref_kind == JVM_REF_invokeSpecial) { 696 LinkResolver::resolve_special_call(result, 697 link_info, THREAD); 698 } else if (ref_kind == JVM_REF_invokeVirtual) { 699 LinkResolver::resolve_virtual_call(result, Handle(), defc, 700 link_info, false, THREAD); 701 } else { 702 assert(false, "ref_kind=%d", ref_kind); 703 } 704 if (HAS_PENDING_EXCEPTION) { 705 return empty; 706 } 707 } 708 if (result.resolved_appendix().not_null()) { 709 // The resolved MemberName must not be accompanied by an appendix argument, 710 // since there is no way to bind this value into the MemberName. 711 // Caller is responsible to prevent this from happening. 712 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 713 } 714 oop mname2 = init_method_MemberName(mname, result); 715 return Handle(THREAD, mname2); 716 } 717 case IS_CONSTRUCTOR: 718 { 719 CallInfo result; 720 LinkInfo link_info(defc, name, type, caller, caller.not_null()); 721 { 722 assert(!HAS_PENDING_EXCEPTION, ""); 723 if (name == vmSymbols::object_initializer_name()) { 724 LinkResolver::resolve_special_call(result, link_info, THREAD); 725 } else { 726 break; // will throw after end of switch 727 } 728 if (HAS_PENDING_EXCEPTION) { 729 return empty; 730 } 731 } 732 assert(result.is_statically_bound(), ""); 733 oop mname2 = init_method_MemberName(mname, result); 734 return Handle(THREAD, mname2); 735 } 736 case IS_FIELD: 737 { 738 fieldDescriptor result; // find_field initializes fd if found 739 { 740 assert(!HAS_PENDING_EXCEPTION, ""); 741 LinkInfo link_info(defc, name, type, caller, /*check_access*/false); 742 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 743 if (HAS_PENDING_EXCEPTION) { 744 return empty; 745 } 746 } 747 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 748 return Handle(THREAD, mname2); 749 } 750 default: 751 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 752 } 753 754 return empty; 755 } 756 757 // Conversely, a member name which is only initialized from JVM internals 758 // may have null defc, name, and type fields. 759 // Resolving it plants a vmtarget/vmindex in it, 760 // which refers directly to JVM internals. 761 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 762 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 763 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 764 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 765 if (vmtarget == NULL) { 766 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 767 } 768 769 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 770 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 771 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 772 int flags = java_lang_invoke_MemberName::flags(mname()); 773 774 if (suppress != 0) { 775 if (suppress & _suppress_defc) have_defc = true; 776 if (suppress & _suppress_name) have_name = true; 777 if (suppress & _suppress_type) have_type = true; 778 } 779 780 if (have_defc && have_name && have_type) return; // nothing needed 781 782 switch (flags & ALL_KINDS) { 783 case IS_METHOD: 784 case IS_CONSTRUCTOR: 785 { 786 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 787 methodHandle m(THREAD, (Method*)vmtarget); 788 DEBUG_ONLY(vmtarget = NULL); // safety 789 if (m.is_null()) break; 790 if (!have_defc) { 791 InstanceKlass* defc = m->method_holder(); 792 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 793 } 794 if (!have_name) { 795 //not java_lang_String::create_from_symbol; let's intern member names 796 Handle name = StringTable::intern(m->name(), CHECK); 797 java_lang_invoke_MemberName::set_name(mname(), name()); 798 } 799 if (!have_type) { 800 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 801 java_lang_invoke_MemberName::set_type(mname(), type()); 802 } 803 return; 804 } 805 case IS_FIELD: 806 { 807 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 808 if (!((Klass*) vmtarget)->is_instance_klass()) break; 809 instanceKlassHandle defc(THREAD, (Klass*) vmtarget); 810 DEBUG_ONLY(vmtarget = NULL); // safety 811 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 812 fieldDescriptor fd; // find_field initializes fd if found 813 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 814 break; // cannot expand 815 if (!have_defc) { 816 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 817 } 818 if (!have_name) { 819 //not java_lang_String::create_from_symbol; let's intern member names 820 Handle name = StringTable::intern(fd.name(), CHECK); 821 java_lang_invoke_MemberName::set_name(mname(), name()); 822 } 823 if (!have_type) { 824 // If it is a primitive field type, don't mess with short strings like "I". 825 Handle type = field_signature_type_or_null(fd.signature()); 826 if (type.is_null()) { 827 java_lang_String::create_from_symbol(fd.signature(), CHECK); 828 } 829 java_lang_invoke_MemberName::set_type(mname(), type()); 830 } 831 return; 832 } 833 } 834 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 835 } 836 837 int MethodHandles::find_MemberNames(KlassHandle k, 838 Symbol* name, Symbol* sig, 839 int mflags, KlassHandle caller, 840 int skip, objArrayHandle results) { 841 // %%% take caller into account! 842 843 Thread* thread = Thread::current(); 844 845 if (k.is_null() || !k->is_instance_klass()) return -1; 846 847 int rfill = 0, rlimit = results->length(), rskip = skip; 848 // overflow measurement: 849 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 850 851 int match_flags = mflags; 852 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 853 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 854 bool local_only = !(search_superc | search_intfc); 855 bool classes_only = false; 856 857 if (name != NULL) { 858 if (name->utf8_length() == 0) return 0; // a match is not possible 859 } 860 if (sig != NULL) { 861 if (sig->utf8_length() == 0) return 0; // a match is not possible 862 if (sig->byte_at(0) == '(') 863 match_flags &= ~(IS_FIELD | IS_TYPE); 864 else 865 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 866 } 867 868 if ((match_flags & IS_TYPE) != 0) { 869 // NYI, and Core Reflection works quite well for this query 870 } 871 872 if ((match_flags & IS_FIELD) != 0) { 873 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 874 if (name != NULL && st.name() != name) 875 continue; 876 if (sig != NULL && st.signature() != sig) 877 continue; 878 // passed the filters 879 if (rskip > 0) { 880 --rskip; 881 } else if (rfill < rlimit) { 882 Handle result(thread, results->obj_at(rfill++)); 883 if (!java_lang_invoke_MemberName::is_instance(result())) 884 return -99; // caller bug! 885 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 886 if (saved != result()) 887 results->obj_at_put(rfill-1, saved); // show saved instance to user 888 } else if (++overflow >= overflow_limit) { 889 match_flags = 0; break; // got tired of looking at overflow 890 } 891 } 892 } 893 894 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 895 // watch out for these guys: 896 Symbol* init_name = vmSymbols::object_initializer_name(); 897 Symbol* clinit_name = vmSymbols::class_initializer_name(); 898 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 899 bool negate_name_test = false; 900 // fix name so that it captures the intention of IS_CONSTRUCTOR 901 if (!(match_flags & IS_METHOD)) { 902 // constructors only 903 if (name == NULL) { 904 name = init_name; 905 } else if (name != init_name) { 906 return 0; // no constructors of this method name 907 } 908 } else if (!(match_flags & IS_CONSTRUCTOR)) { 909 // methods only 910 if (name == NULL) { 911 name = init_name; 912 negate_name_test = true; // if we see the name, we *omit* the entry 913 } else if (name == init_name) { 914 return 0; // no methods of this constructor name 915 } 916 } else { 917 // caller will accept either sort; no need to adjust name 918 } 919 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 920 Method* m = st.method(); 921 Symbol* m_name = m->name(); 922 if (m_name == clinit_name) 923 continue; 924 if (name != NULL && ((m_name != name) ^ negate_name_test)) 925 continue; 926 if (sig != NULL && m->signature() != sig) 927 continue; 928 // passed the filters 929 if (rskip > 0) { 930 --rskip; 931 } else if (rfill < rlimit) { 932 Handle result(thread, results->obj_at(rfill++)); 933 if (!java_lang_invoke_MemberName::is_instance(result())) 934 return -99; // caller bug! 935 CallInfo info(m); 936 oop saved = MethodHandles::init_method_MemberName(result, info); 937 if (saved != result()) 938 results->obj_at_put(rfill-1, saved); // show saved instance to user 939 } else if (++overflow >= overflow_limit) { 940 match_flags = 0; break; // got tired of looking at overflow 941 } 942 } 943 } 944 945 // return number of elements we at leasted wanted to initialize 946 return rfill + overflow; 947 } 948 949 // Is it safe to remove stale entries from a dependency list? 950 static bool safe_to_expunge() { 951 // Since parallel GC threads can concurrently iterate over a dependency 952 // list during safepoint, it is safe to remove entries only when 953 // CodeCache lock is held. 954 return CodeCache_lock->owned_by_self(); 955 } 956 957 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 958 assert_locked_or_safepoint(CodeCache_lock); 959 960 oop context = java_lang_invoke_CallSite::context(call_site); 961 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 962 // Try to purge stale entries on updates. 963 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 964 // in order to avoid memory leak, stale entries are purged whenever a dependency list 965 // is changed (both on addition and removal). Though memory reclamation is delayed, 966 // it avoids indefinite memory usage growth. 967 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 968 } 969 970 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 971 assert_locked_or_safepoint(CodeCache_lock); 972 973 oop context = java_lang_invoke_CallSite::context(call_site); 974 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 975 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 976 } 977 978 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 979 assert_lock_strong(Compile_lock); 980 981 int marked = 0; 982 CallSiteDepChange changes(call_site(), target()); 983 { 984 No_Safepoint_Verifier nsv; 985 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 986 987 oop context = java_lang_invoke_CallSite::context(call_site()); 988 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 989 marked = deps.mark_dependent_nmethods(changes); 990 } 991 if (marked > 0) { 992 // At least one nmethod has been marked for deoptimization. 993 VM_Deoptimize op; 994 VMThread::execute(&op); 995 } 996 } 997 998 //------------------------------------------------------------------------------ 999 // MemberNameTable 1000 // 1001 1002 MemberNameTable::MemberNameTable(int methods_cnt) 1003 : GrowableArray<jweak>(methods_cnt, true) { 1004 assert_locked_or_safepoint(MemberNameTable_lock); 1005 } 1006 1007 MemberNameTable::~MemberNameTable() { 1008 assert_locked_or_safepoint(MemberNameTable_lock); 1009 int len = this->length(); 1010 1011 for (int idx = 0; idx < len; idx++) { 1012 jweak ref = this->at(idx); 1013 JNIHandles::destroy_weak_global(ref); 1014 } 1015 } 1016 1017 void MemberNameTable::add_member_name(jweak mem_name_wref) { 1018 assert_locked_or_safepoint(MemberNameTable_lock); 1019 this->push(mem_name_wref); 1020 } 1021 1022 #if INCLUDE_JVMTI 1023 // It is called at safepoint only for RedefineClasses 1024 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) { 1025 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 1026 // For each redefined method 1027 for (int idx = 0; idx < length(); idx++) { 1028 oop mem_name = JNIHandles::resolve(this->at(idx)); 1029 if (mem_name == NULL) { 1030 continue; 1031 } 1032 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); 1033 1034 if (old_method == NULL || !old_method->is_old()) { 1035 continue; // skip uninteresting entries 1036 } 1037 if (old_method->is_deleted()) { 1038 // skip entries with deleted methods 1039 continue; 1040 } 1041 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); 1042 1043 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 1044 assert(old_method != new_method, "sanity check"); 1045 1046 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method); 1047 1048 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 1049 if (!(*trace_name_printed)) { 1050 // RC_TRACE_MESG macro has an embedded ResourceMark 1051 RC_TRACE_MESG(("adjust: name=%s", 1052 old_method->method_holder()->external_name())); 1053 *trace_name_printed = true; 1054 } 1055 // RC_TRACE macro has an embedded ResourceMark 1056 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)", 1057 new_method->name()->as_C_string(), 1058 new_method->signature()->as_C_string())); 1059 } 1060 } 1061 } 1062 #endif // INCLUDE_JVMTI 1063 1064 // 1065 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1066 // They are the private interface between this JVM and the HotSpot-specific 1067 // Java code that implements JSR 292 method handles. 1068 // 1069 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1070 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1071 // 1072 1073 #ifndef PRODUCT 1074 #define EACH_NAMED_CON(template, requirement) \ 1075 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1076 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1077 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1078 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1079 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1080 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1081 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1082 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1083 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1084 /*end*/ 1085 1086 #define IGNORE_REQ(req_expr) /* req_expr */ 1087 #define ONE_PLUS(scope,value) 1+ 1088 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1089 #define VALUE_COMMA(scope,value) scope::value, 1090 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1091 #define STRING_NULL(scope,value) #value "\0" 1092 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1093 1094 static bool advertise_con_value(int which) { 1095 if (which < 0) return false; 1096 bool ok = true; 1097 int count = 0; 1098 #define INC_COUNT(scope,value) \ 1099 ++count; 1100 #define CHECK_REQ(req_expr) \ 1101 if (which < count) return ok; \ 1102 ok = (req_expr); 1103 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1104 #undef INC_COUNT 1105 #undef CHECK_REQ 1106 assert(count == con_value_count, ""); 1107 if (which < count) return ok; 1108 return false; 1109 } 1110 1111 #undef ONE_PLUS 1112 #undef VALUE_COMMA 1113 #undef STRING_NULL 1114 #undef EACH_NAMED_CON 1115 #endif // PRODUCT 1116 1117 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1118 #ifndef PRODUCT 1119 if (advertise_con_value(which)) { 1120 assert(which >= 0 && which < con_value_count, ""); 1121 int con = con_values[which]; 1122 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1123 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1124 const char* str = &con_names[0]; 1125 for (int i = 0; i < which; i++) 1126 str += strlen(str) + 1; // skip name and null 1127 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1128 box->obj_at_put(0, name); 1129 } 1130 return con; 1131 } 1132 #endif 1133 return 0; 1134 } 1135 JVM_END 1136 1137 // void init(MemberName self, AccessibleObject ref) 1138 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1139 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1140 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1141 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1142 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1143 MethodHandles::init_MemberName(mname, target); 1144 } 1145 JVM_END 1146 1147 // void expand(MemberName self) 1148 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1149 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1150 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1151 MethodHandles::expand_MemberName(mname, 0, CHECK); 1152 } 1153 JVM_END 1154 1155 // void resolve(MemberName self, Class<?> caller) 1156 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1157 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1158 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1159 1160 // The trusted Java code that calls this method should already have performed 1161 // access checks on behalf of the given caller. But, we can verify this. 1162 if (VerifyMethodHandles && caller_jh != NULL && 1163 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1164 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1165 if (reference_klass != NULL && reference_klass->is_objArray_klass()) { 1166 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1167 } 1168 1169 // Reflection::verify_class_access can only handle instance classes. 1170 if (reference_klass != NULL && reference_klass->is_instance_klass()) { 1171 // Emulate LinkResolver::check_klass_accessability. 1172 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1173 if (!Reflection::verify_class_access(caller, 1174 reference_klass, 1175 true)) { 1176 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1177 } 1178 } 1179 } 1180 1181 KlassHandle caller(THREAD, 1182 caller_jh == NULL ? (Klass*) NULL : 1183 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh))); 1184 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1185 1186 if (resolved.is_null()) { 1187 int flags = java_lang_invoke_MemberName::flags(mname()); 1188 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1189 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1190 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1191 } 1192 if ((flags & ALL_KINDS) == IS_FIELD) { 1193 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); 1194 } else if ((flags & ALL_KINDS) == IS_METHOD || 1195 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1196 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); 1197 } else { 1198 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1199 } 1200 } 1201 1202 return JNIHandles::make_local(THREAD, resolved()); 1203 } 1204 JVM_END 1205 1206 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1207 if (mname == NULL || 1208 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1209 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1210 } else { 1211 int flags = java_lang_invoke_MemberName::flags(mname); 1212 if ((flags & IS_FIELD) != 0 && 1213 (must_be_static 1214 ? (flags & JVM_ACC_STATIC) != 0 1215 : (flags & JVM_ACC_STATIC) == 0)) { 1216 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1217 return (jlong) vmindex; 1218 } 1219 } 1220 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1221 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1222 return 0; 1223 } 1224 1225 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1226 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1227 } 1228 JVM_END 1229 1230 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1231 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1232 } 1233 JVM_END 1234 1235 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1236 // use the other function to perform sanity checks: 1237 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1238 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1239 return JNIHandles::make_local(THREAD, clazz); 1240 } 1241 JVM_END 1242 1243 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1244 if (mname_jh == NULL) return NULL; 1245 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1246 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1247 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1248 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1249 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1250 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1251 result->obj_at_put(0, x); 1252 x = NULL; 1253 if (vmtarget == NULL) { 1254 x = NULL; 1255 } else if (vmtarget->is_klass()) { 1256 x = ((Klass*) vmtarget)->java_mirror(); 1257 } else if (vmtarget->is_method()) { 1258 x = mname(); 1259 } 1260 result->obj_at_put(1, x); 1261 return JNIHandles::make_local(env, result()); 1262 } 1263 JVM_END 1264 1265 1266 1267 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1268 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1269 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1270 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1271 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1272 if (clazz_jh == NULL || results_jh == NULL) return -1; 1273 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); 1274 1275 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1276 if (results.is_null() || !results->is_objArray()) return -1; 1277 1278 TempNewSymbol name = NULL; 1279 TempNewSymbol sig = NULL; 1280 if (name_jh != NULL) { 1281 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1282 if (name == NULL) return 0; // a match is not possible 1283 } 1284 if (sig_jh != NULL) { 1285 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1286 if (sig == NULL) return 0; // a match is not possible 1287 } 1288 1289 KlassHandle caller; 1290 if (caller_jh != NULL) { 1291 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1292 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1293 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); 1294 } 1295 1296 if (name != NULL && sig != NULL && results.not_null()) { 1297 // try a direct resolve 1298 // %%% TO DO 1299 } 1300 1301 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1302 caller, skip, results); 1303 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1304 return res; 1305 } 1306 JVM_END 1307 1308 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1309 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1310 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1311 { 1312 // Walk all nmethods depending on this call site. 1313 MutexLocker mu(Compile_lock, thread); 1314 MethodHandles::flush_dependent_nmethods(call_site, target); 1315 java_lang_invoke_CallSite::set_target(call_site(), target()); 1316 } 1317 } 1318 JVM_END 1319 1320 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1321 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1322 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1323 { 1324 // Walk all nmethods depending on this call site. 1325 MutexLocker mu(Compile_lock, thread); 1326 MethodHandles::flush_dependent_nmethods(call_site, target); 1327 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1328 } 1329 } 1330 JVM_END 1331 1332 // It is called by a Cleaner object which ensures that dropped CallSites properly 1333 // deallocate their dependency information. 1334 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1335 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1336 { 1337 // Walk all nmethods depending on this call site. 1338 MutexLocker mu1(Compile_lock, thread); 1339 1340 int marked = 0; 1341 { 1342 No_Safepoint_Verifier nsv; 1343 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1344 assert(safe_to_expunge(), "removal is not safe"); 1345 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1346 marked = deps.remove_all_dependents(); 1347 } 1348 if (marked > 0) { 1349 // At least one nmethod has been marked for deoptimization 1350 VM_Deoptimize op; 1351 VMThread::execute(&op); 1352 } 1353 } 1354 } 1355 JVM_END 1356 1357 /** 1358 * Throws a java/lang/UnsupportedOperationException unconditionally. 1359 * This is required by the specification of MethodHandle.invoke if 1360 * invoked directly. 1361 */ 1362 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1363 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1364 return NULL; 1365 } 1366 JVM_END 1367 1368 /** 1369 * Throws a java/lang/UnsupportedOperationException unconditionally. 1370 * This is required by the specification of MethodHandle.invokeExact if 1371 * invoked directly. 1372 */ 1373 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1374 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1375 return NULL; 1376 } 1377 JVM_END 1378 1379 /// JVM_RegisterMethodHandleMethods 1380 1381 #undef CS // Solaris builds complain 1382 1383 #define LANG "Ljava/lang/" 1384 #define JLINV "Ljava/lang/invoke/" 1385 1386 #define OBJ LANG "Object;" 1387 #define CLS LANG "Class;" 1388 #define STRG LANG "String;" 1389 #define CS JLINV "CallSite;" 1390 #define MT JLINV "MethodType;" 1391 #define MH JLINV "MethodHandle;" 1392 #define MEM JLINV "MemberName;" 1393 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1394 1395 #define CC (char*) /*cast a literal from (const char*)*/ 1396 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1397 1398 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1399 static JNINativeMethod MHN_methods[] = { 1400 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1401 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1402 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)}, 1403 // static native int getNamedCon(int which, Object[] name) 1404 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1405 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1406 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1407 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1408 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1409 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1410 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1411 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1412 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1413 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1414 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1415 }; 1416 1417 static JNINativeMethod MH_methods[] = { 1418 // UnsupportedOperationException throwers 1419 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1420 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1421 }; 1422 1423 /** 1424 * Helper method to register native methods. 1425 */ 1426 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1427 int status = env->RegisterNatives(clazz, methods, nMethods); 1428 if (status != JNI_OK || env->ExceptionOccurred()) { 1429 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 1430 env->ExceptionClear(); 1431 return false; 1432 } 1433 return true; 1434 } 1435 1436 /** 1437 * This one function is exported, used by NativeLookup. 1438 */ 1439 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1440 assert(!MethodHandles::enabled(), "must not be enabled"); 1441 bool enable_MH = true; 1442 1443 jclass MH_class = NULL; 1444 if (SystemDictionary::MethodHandle_klass() == NULL) { 1445 enable_MH = false; 1446 } else { 1447 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1448 MH_class = (jclass) JNIHandles::make_local(env, mirror); 1449 } 1450 1451 if (enable_MH) { 1452 ThreadToNativeFromVM ttnfv(thread); 1453 1454 if (enable_MH) { 1455 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1456 } 1457 if (enable_MH) { 1458 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1459 } 1460 } 1461 1462 if (TraceInvokeDynamic) { 1463 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1464 } 1465 1466 if (enable_MH) { 1467 if (MethodHandles::generate_adapters() == false) { 1468 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters"); 1469 } 1470 MethodHandles::set_enabled(true); 1471 } 1472 } 1473 JVM_END