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 "prims/jvmtiRedefineClassesTrace.hpp" 39 #include "runtime/compilationPolicy.hpp" 40 #include "runtime/javaCalls.hpp" 41 #include "runtime/reflection.hpp" 42 #include "runtime/signature.hpp" 43 #include "runtime/stubRoutines.hpp" 44 #include "utilities/exceptions.hpp" 45 46 47 /* 48 * JSR 292 reference implementation: method handles 49 * The JDK 7 reference implementation represented method handle 50 * combinations as chains. Each link in the chain had a "vmentry" 51 * field which pointed at a bit of assembly code which performed 52 * one transformation before dispatching to the next link in the chain. 53 * 54 * The current reference implementation pushes almost all code generation 55 * responsibility to (trusted) Java code. A method handle contains a 56 * pointer to its "LambdaForm", which embodies all details of the method 57 * handle's behavior. The LambdaForm is a normal Java object, managed 58 * by a runtime coded in Java. 59 */ 60 61 bool MethodHandles::_enabled = false; // set true after successful native linkage 62 MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 63 64 65 /** 66 * Generates method handle adapters. Returns 'false' if memory allocation 67 * failed and true otherwise. 68 */ 69 bool MethodHandles::generate_adapters() { 70 if (SystemDictionary::MethodHandle_klass() == NULL) { 71 return true; 72 } 73 74 assert(_adapter_code == NULL, "generate only once"); 75 76 ResourceMark rm; 77 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); 78 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 79 if (_adapter_code == NULL) { 80 return false; 81 } 82 83 CodeBuffer code(_adapter_code); 84 MethodHandlesAdapterGenerator g(&code); 85 g.generate(); 86 code.log_section_sizes("MethodHandlesAdapterBlob"); 87 return true; 88 } 89 90 //------------------------------------------------------------------------------ 91 // MethodHandlesAdapterGenerator::generate 92 // 93 void MethodHandlesAdapterGenerator::generate() { 94 // Generate generic method handle adapters. 95 // Generate interpreter entries 96 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 97 mk <= Interpreter::method_handle_invoke_LAST; 98 mk = Interpreter::MethodKind(1 + (int)mk)) { 99 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 100 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 101 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 102 if (entry != NULL) { 103 Interpreter::set_entry_for_kind(mk, entry); 104 } 105 // If the entry is not set, it will throw AbstractMethodError. 106 } 107 } 108 109 void MethodHandles::set_enabled(bool z) { 110 if (_enabled != z) { 111 guarantee(z, "can only enable once"); 112 _enabled = z; 113 } 114 } 115 116 // MemberName support 117 118 // import java_lang_invoke_MemberName.* 119 enum { 120 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 121 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 122 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 123 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 124 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 125 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 126 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 127 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 128 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 129 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 130 }; 131 132 Handle MethodHandles::new_MemberName(TRAPS) { 133 Handle empty; 134 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 135 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 136 return Handle(THREAD, k->allocate_instance(THREAD)); 137 } 138 139 oop MethodHandles::init_MemberName(Handle mname, Handle target) { 140 // This method is used from java.lang.invoke.MemberName constructors. 141 // It fills in the new MemberName from a java.lang.reflect.Member. 142 Thread* thread = Thread::current(); 143 oop target_oop = target(); 144 Klass* target_klass = target_oop->klass(); 145 if (target_klass == SystemDictionary::reflect_Field_klass()) { 146 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 147 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 148 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 149 if (!k.is_null() && k->oop_is_instance()) { 150 fieldDescriptor fd(InstanceKlass::cast(k()), slot); 151 oop mname2 = init_field_MemberName(mname, fd); 152 if (mname2 != NULL) { 153 // Since we have the reified name and type handy, add them to the result. 154 if (java_lang_invoke_MemberName::name(mname2) == NULL) 155 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 156 if (java_lang_invoke_MemberName::type(mname2) == NULL) 157 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 158 } 159 return mname2; 160 } 161 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 162 oop clazz = java_lang_reflect_Method::clazz(target_oop); 163 int slot = java_lang_reflect_Method::slot(target_oop); 164 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 165 if (!k.is_null() && k->oop_is_instance()) { 166 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 167 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 168 return NULL; // do not resolve unless there is a concrete signature 169 CallInfo info(m, k()); 170 return init_method_MemberName(mname, info); 171 } 172 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 173 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 174 int slot = java_lang_reflect_Constructor::slot(target_oop); 175 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 176 if (!k.is_null() && k->oop_is_instance()) { 177 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 178 if (m == NULL) return NULL; 179 CallInfo info(m, k()); 180 return init_method_MemberName(mname, info); 181 } 182 } 183 return NULL; 184 } 185 186 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 187 assert(info.resolved_appendix().is_null(), "only normal methods here"); 188 methodHandle m = info.resolved_method(); 189 KlassHandle m_klass = m->method_holder(); 190 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 191 int vmindex = Method::invalid_vtable_index; 192 193 switch (info.call_kind()) { 194 case CallInfo::itable_call: 195 vmindex = info.itable_index(); 196 // More importantly, the itable index only works with the method holder. 197 assert(m_klass->verify_itable_index(vmindex), ""); 198 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 199 if (TraceInvokeDynamic) { 200 ResourceMark rm; 201 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 202 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 203 vmindex); 204 m->access_flags().print_on(tty); 205 if (!m->is_abstract()) { 206 tty->print("default"); 207 } 208 tty->cr(); 209 } 210 break; 211 212 case CallInfo::vtable_call: 213 vmindex = info.vtable_index(); 214 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 215 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe"); 216 if (m_klass->is_interface()) { 217 // This is a vtable call to an interface method (abstract "miranda method" or default method). 218 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 219 // (LinkResolver should help us figure this out.) 220 KlassHandle m_klass_non_interface = info.resolved_klass(); 221 if (m_klass_non_interface->is_interface()) { 222 m_klass_non_interface = SystemDictionary::Object_klass(); 223 #ifdef ASSERT 224 { ResourceMark rm; 225 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex); 226 assert(m->name() == m2->name() && m->signature() == m2->signature(), 227 err_msg("at %d, %s != %s", vmindex, 228 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string())); 229 } 230 #endif //ASSERT 231 } 232 if (!m->is_public()) { 233 assert(m->is_public(), "virtual call must be to public interface method"); 234 return NULL; // elicit an error later in product build 235 } 236 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe"); 237 m_klass = m_klass_non_interface; 238 } 239 if (TraceInvokeDynamic) { 240 ResourceMark rm; 241 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 242 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 243 m_klass->internal_name(), vmindex); 244 m->access_flags().print_on(tty); 245 if (m->is_default_method()) { 246 tty->print("default"); 247 } 248 tty->cr(); 249 } 250 break; 251 252 case CallInfo::direct_call: 253 vmindex = Method::nonvirtual_vtable_index; 254 if (m->is_static()) { 255 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 256 } else if (m->is_initializer()) { 257 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 258 } else { 259 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 260 } 261 break; 262 263 default: assert(false, "bad CallInfo"); return NULL; 264 } 265 266 // @CallerSensitive annotation detected 267 if (m->caller_sensitive()) { 268 flags |= CALLER_SENSITIVE; 269 } 270 271 oop mname_oop = mname(); 272 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 273 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); 274 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 275 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror()); 276 // Note: name and type can be lazily computed by resolve_MemberName, 277 // if Java code needs them as resolved String and MethodType objects. 278 // The clazz must be eagerly stored, because it provides a GC 279 // root to help keep alive the Method*. 280 // If relevant, the vtable or itable value is stored as vmindex. 281 // This is done eagerly, since it is readily available without 282 // constructing any new objects. 283 // TO DO: maybe intern mname_oop 284 if (m->method_holder()->add_member_name(mname)) { 285 return mname(); 286 } else { 287 // Redefinition caused this to fail. Return NULL (and an exception?) 288 return NULL; 289 } 290 } 291 292 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 293 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 294 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 295 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 296 Metadata* vmtarget = fd.field_holder(); 297 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 298 oop mname_oop = mname(); 299 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 300 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 301 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 302 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); 303 oop type = field_signature_type_or_null(fd.signature()); 304 oop name = field_name_or_null(fd.name()); 305 if (name != NULL) 306 java_lang_invoke_MemberName::set_name(mname_oop, name); 307 if (type != NULL) 308 java_lang_invoke_MemberName::set_type(mname_oop, type); 309 // Note: name and type can be lazily computed by resolve_MemberName, 310 // if Java code needs them as resolved String and Class objects. 311 // Note that the incoming type oop might be pre-resolved (non-null). 312 // The base clazz and field offset (vmindex) must be eagerly stored, 313 // because they unambiguously identify the field. 314 // Although the fieldDescriptor::_index would also identify the field, 315 // we do not use it, because it is harder to decode. 316 // TO DO: maybe intern mname_oop 317 return mname(); 318 } 319 320 // JVM 2.9 Special Methods: 321 // A method is signature polymorphic if and only if all of the following conditions hold : 322 // * It is declared in the java.lang.invoke.MethodHandle class. 323 // * It has a single formal parameter of type Object[]. 324 // * It has a return type of Object. 325 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 326 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 327 if (klass == NULL) 328 return false; 329 // The following test will fail spuriously during bootstrap of MethodHandle itself: 330 // if (klass != SystemDictionary::MethodHandle_klass()) 331 // Test the name instead: 332 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle()) 333 return false; 334 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 335 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig); 336 if (m == NULL) return false; 337 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 338 int flags = m->access_flags().as_int(); 339 return (flags & required) == required; 340 } 341 342 343 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 344 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid)); 345 switch (iid) { 346 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 347 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 348 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 349 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 350 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 351 } 352 assert(false, ""); 353 return 0; 354 } 355 356 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 357 switch (iid) { 358 case vmIntrinsics::_invokeBasic: return 0; 359 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 360 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 361 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 362 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 363 } 364 assert(false, err_msg("iid=%d", iid)); 365 return 0; 366 } 367 368 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 369 vmSymbols::SID name_id = vmSymbols::find_sid(name); 370 switch (name_id) { 371 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 372 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 373 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 374 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 375 376 // There is one static signature-polymorphic method for each JVM invocation mode. 377 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 378 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 379 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 380 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 381 } 382 383 // Cover the case of invokeExact and any future variants of invokeFoo. 384 Klass* mh_klass = SystemDictionary::well_known_klass( 385 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 386 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) 387 return vmIntrinsics::_invokeGeneric; 388 389 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 390 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 391 return vmIntrinsics::_none; 392 } 393 394 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 395 if (klass != NULL && 396 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) { 397 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 398 if (iid != vmIntrinsics::_none) 399 return iid; 400 if (is_method_handle_invoke_name(klass, name)) 401 return vmIntrinsics::_invokeGeneric; 402 } 403 return vmIntrinsics::_none; 404 } 405 406 407 // convert the external string or reflective type to an internal signature 408 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 409 if (java_lang_invoke_MethodType::is_instance(type_str)) { 410 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 411 } else if (java_lang_Class::is_instance(type_str)) { 412 return java_lang_Class::as_signature(type_str, false, THREAD); 413 } else if (java_lang_String::is_instance_inlined(type_str)) { 414 if (intern_if_not_found) { 415 return java_lang_String::as_symbol(type_str, THREAD); 416 } else { 417 return java_lang_String::as_symbol_or_null(type_str); 418 } 419 } else { 420 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 421 } 422 } 423 424 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 425 enum { OBJ_SIG_LEN = 18 }; 426 427 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 428 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 429 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 430 const int len = sig->utf8_length(); 431 for (int i = 0; i < len; i++) { 432 switch (sig->byte_at(i)) { 433 case 'L': 434 // only java/lang/Object is valid here 435 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 436 return false; 437 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 438 continue; 439 case '(': case ')': case 'V': 440 case 'I': case 'J': case 'F': case 'D': 441 continue; 442 //case '[': 443 //case 'Z': case 'B': case 'C': case 'S': 444 default: 445 return false; 446 } 447 } 448 return true; 449 } 450 451 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 452 Symbol* bsig = NULL; 453 if (sig == NULL) { 454 return sig; 455 } else if (is_basic_type_signature(sig)) { 456 sig->increment_refcount(); 457 return sig; // that was easy 458 } else if (sig->byte_at(0) != '(') { 459 BasicType bt = char2type(sig->byte_at(0)); 460 if (is_subword_type(bt)) { 461 bsig = vmSymbols::int_signature(); 462 } else { 463 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 464 bsig = vmSymbols::object_signature(); 465 } 466 } else { 467 ResourceMark rm; 468 stringStream buffer(128); 469 buffer.put('('); 470 int arg_pos = 0, keep_arg_pos = -1; 471 if (keep_last_arg) 472 keep_arg_pos = ArgumentCount(sig).size() - 1; 473 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 474 BasicType bt = ss.type(); 475 size_t this_arg_pos = buffer.size(); 476 if (ss.at_return_type()) { 477 buffer.put(')'); 478 } 479 if (arg_pos == keep_arg_pos) { 480 buffer.write((char*) ss.raw_bytes(), 481 (int) ss.raw_length()); 482 } else if (bt == T_OBJECT || bt == T_ARRAY) { 483 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 484 } else { 485 if (is_subword_type(bt)) 486 bt = T_INT; 487 buffer.put(type2char(bt)); 488 } 489 arg_pos++; 490 } 491 const char* sigstr = buffer.base(); 492 int siglen = (int) buffer.size(); 493 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 494 } 495 assert(is_basic_type_signature(bsig) || 496 // detune assert in case the injected argument is not a basic type: 497 keep_last_arg, ""); 498 return bsig; 499 } 500 501 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 502 Symbol* sig, 503 bool keep_arrays, 504 bool keep_basic_names) { 505 st = st ? st : tty; 506 int len = sig->utf8_length(); 507 int array = 0; 508 bool prev_type = false; 509 for (int i = 0; i < len; i++) { 510 char ch = sig->byte_at(i); 511 switch (ch) { 512 case '(': case ')': 513 prev_type = false; 514 st->put(ch); 515 continue; 516 case '[': 517 if (!keep_basic_names && keep_arrays) 518 st->put(ch); 519 array++; 520 continue; 521 case 'L': 522 { 523 if (prev_type) st->put(','); 524 int start = i+1, slash = start; 525 while (++i < len && (ch = sig->byte_at(i)) != ';') { 526 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 527 } 528 if (slash < i) start = slash; 529 if (!keep_basic_names) { 530 st->put('L'); 531 } else { 532 for (int j = start; j < i; j++) 533 st->put(sig->byte_at(j)); 534 prev_type = true; 535 } 536 break; 537 } 538 default: 539 { 540 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 541 ch = '['; 542 array = 0; 543 } 544 if (prev_type) st->put(','); 545 const char* n = NULL; 546 if (keep_basic_names) 547 n = type2name(char2type(ch)); 548 if (n == NULL) { 549 // unknown letter, or we don't want to know its name 550 st->put(ch); 551 } else { 552 st->print("%s", n); 553 prev_type = true; 554 } 555 break; 556 } 557 } 558 // Switch break goes here to take care of array suffix: 559 if (prev_type) { 560 while (array > 0) { 561 st->print("[]"); 562 --array; 563 } 564 } 565 array = 0; 566 } 567 } 568 569 570 571 static oop object_java_mirror() { 572 return SystemDictionary::Object_klass()->java_mirror(); 573 } 574 575 oop MethodHandles::field_name_or_null(Symbol* s) { 576 if (s == NULL) return NULL; 577 return StringTable::lookup(s); 578 } 579 580 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 581 if (s == NULL) return NULL; 582 BasicType bt = FieldType::basic_type(s); 583 if (is_java_primitive(bt)) { 584 assert(s->utf8_length() == 1, ""); 585 return java_lang_Class::primitive_mirror(bt); 586 } 587 // Here are some more short cuts for common types. 588 // They are optional, since reference types can be resolved lazily. 589 if (bt == T_OBJECT) { 590 if (s == vmSymbols::object_signature()) { 591 return object_java_mirror(); 592 } else if (s == vmSymbols::class_signature()) { 593 return SystemDictionary::Class_klass()->java_mirror(); 594 } else if (s == vmSymbols::string_signature()) { 595 return SystemDictionary::String_klass()->java_mirror(); 596 } 597 } 598 return NULL; 599 } 600 601 602 // An unresolved member name is a mere symbolic reference. 603 // Resolving it plants a vmtarget/vmindex in it, 604 // which refers directly to JVM internals. 605 Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) { 606 Handle empty; 607 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 608 609 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 610 // Already resolved. 611 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 612 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 613 return mname; 614 } 615 616 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 617 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 618 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 619 int flags = java_lang_invoke_MemberName::flags(mname()); 620 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 621 if (!ref_kind_is_valid(ref_kind)) { 622 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 623 } 624 625 DEBUG_ONLY(int old_vmindex); 626 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 627 628 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 629 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 630 } 631 632 instanceKlassHandle defc; 633 { 634 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 635 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 636 if (!defc_klass->oop_is_instance()) { 637 if (!defc_klass->oop_is_array()) return empty; 638 defc_klass = SystemDictionary::Object_klass(); 639 } 640 defc = instanceKlassHandle(THREAD, defc_klass); 641 } 642 if (defc.is_null()) { 643 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 644 } 645 defc->link_class(CHECK_(empty)); // possible safepoint 646 647 // convert the external string name to an internal symbol 648 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 649 if (name == NULL) return empty; // no such name 650 if (name == vmSymbols::class_initializer_name()) 651 return empty; // illegal name 652 653 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 654 if ((flags & ALL_KINDS) == IS_METHOD && 655 (defc() == SystemDictionary::MethodHandle_klass()) && 656 (ref_kind == JVM_REF_invokeVirtual || 657 ref_kind == JVM_REF_invokeSpecial || 658 // static invocation mode is required for _linkToVirtual, etc.: 659 ref_kind == JVM_REF_invokeStatic)) { 660 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 661 if (iid != vmIntrinsics::_none && 662 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 663 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 664 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 665 mh_invoke_id = iid; 666 } 667 } 668 669 // convert the external string or reflective type to an internal signature 670 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 671 if (type == NULL) return empty; // no such signature exists in the VM 672 673 // Time to do the lookup. 674 switch (flags & ALL_KINDS) { 675 case IS_METHOD: 676 { 677 CallInfo result; 678 { 679 assert(!HAS_PENDING_EXCEPTION, ""); 680 if (ref_kind == JVM_REF_invokeStatic) { 681 LinkResolver::resolve_static_call(result, 682 defc, name, type, caller, caller.not_null(), false, THREAD); 683 } else if (ref_kind == JVM_REF_invokeInterface) { 684 LinkResolver::resolve_interface_call(result, Handle(), defc, 685 defc, name, type, caller, caller.not_null(), false, THREAD); 686 } else if (mh_invoke_id != vmIntrinsics::_none) { 687 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 688 LinkResolver::resolve_handle_call(result, 689 defc, name, type, caller, THREAD); 690 } else if (ref_kind == JVM_REF_invokeSpecial) { 691 LinkResolver::resolve_special_call(result, 692 defc, name, type, caller, caller.not_null(), THREAD); 693 } else if (ref_kind == JVM_REF_invokeVirtual) { 694 LinkResolver::resolve_virtual_call(result, Handle(), defc, 695 defc, name, type, caller, caller.not_null(), false, THREAD); 696 } else { 697 assert(false, err_msg("ref_kind=%d", ref_kind)); 698 } 699 if (HAS_PENDING_EXCEPTION) { 700 return empty; 701 } 702 } 703 if (result.resolved_appendix().not_null()) { 704 // The resolved MemberName must not be accompanied by an appendix argument, 705 // since there is no way to bind this value into the MemberName. 706 // Caller is responsible to prevent this from happening. 707 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 708 } 709 oop mname2 = init_method_MemberName(mname, result); 710 return Handle(THREAD, mname2); 711 } 712 case IS_CONSTRUCTOR: 713 { 714 CallInfo result; 715 { 716 assert(!HAS_PENDING_EXCEPTION, ""); 717 if (name == vmSymbols::object_initializer_name()) { 718 LinkResolver::resolve_special_call(result, 719 defc, name, type, caller, caller.not_null(), THREAD); 720 } else { 721 break; // will throw after end of switch 722 } 723 if (HAS_PENDING_EXCEPTION) { 724 return empty; 725 } 726 } 727 assert(result.is_statically_bound(), ""); 728 oop mname2 = init_method_MemberName(mname, result); 729 return Handle(THREAD, mname2); 730 } 731 case IS_FIELD: 732 { 733 fieldDescriptor result; // find_field initializes fd if found 734 { 735 assert(!HAS_PENDING_EXCEPTION, ""); 736 LinkResolver::resolve_field(result, defc, name, type, caller, Bytecodes::_nop, false, false, THREAD); 737 if (HAS_PENDING_EXCEPTION) { 738 return empty; 739 } 740 } 741 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 742 return Handle(THREAD, mname2); 743 } 744 default: 745 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 746 } 747 748 return empty; 749 } 750 751 // Conversely, a member name which is only initialized from JVM internals 752 // may have null defc, name, and type fields. 753 // Resolving it plants a vmtarget/vmindex in it, 754 // which refers directly to JVM internals. 755 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 756 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 757 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 758 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 759 if (vmtarget == NULL) { 760 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 761 } 762 763 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 764 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 765 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 766 int flags = java_lang_invoke_MemberName::flags(mname()); 767 768 if (suppress != 0) { 769 if (suppress & _suppress_defc) have_defc = true; 770 if (suppress & _suppress_name) have_name = true; 771 if (suppress & _suppress_type) have_type = true; 772 } 773 774 if (have_defc && have_name && have_type) return; // nothing needed 775 776 switch (flags & ALL_KINDS) { 777 case IS_METHOD: 778 case IS_CONSTRUCTOR: 779 { 780 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 781 methodHandle m(THREAD, (Method*)vmtarget); 782 DEBUG_ONLY(vmtarget = NULL); // safety 783 if (m.is_null()) break; 784 if (!have_defc) { 785 InstanceKlass* defc = m->method_holder(); 786 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 787 } 788 if (!have_name) { 789 //not java_lang_String::create_from_symbol; let's intern member names 790 Handle name = StringTable::intern(m->name(), CHECK); 791 java_lang_invoke_MemberName::set_name(mname(), name()); 792 } 793 if (!have_type) { 794 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 795 java_lang_invoke_MemberName::set_type(mname(), type()); 796 } 797 return; 798 } 799 case IS_FIELD: 800 { 801 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 802 if (!((Klass*) vmtarget)->oop_is_instance()) break; 803 instanceKlassHandle defc(THREAD, (Klass*) vmtarget); 804 DEBUG_ONLY(vmtarget = NULL); // safety 805 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 806 fieldDescriptor fd; // find_field initializes fd if found 807 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 808 break; // cannot expand 809 if (!have_defc) { 810 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 811 } 812 if (!have_name) { 813 //not java_lang_String::create_from_symbol; let's intern member names 814 Handle name = StringTable::intern(fd.name(), CHECK); 815 java_lang_invoke_MemberName::set_name(mname(), name()); 816 } 817 if (!have_type) { 818 // If it is a primitive field type, don't mess with short strings like "I". 819 Handle type = field_signature_type_or_null(fd.signature()); 820 if (type.is_null()) { 821 java_lang_String::create_from_symbol(fd.signature(), CHECK); 822 } 823 java_lang_invoke_MemberName::set_type(mname(), type()); 824 } 825 return; 826 } 827 } 828 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 829 } 830 831 int MethodHandles::find_MemberNames(KlassHandle k, 832 Symbol* name, Symbol* sig, 833 int mflags, KlassHandle caller, 834 int skip, objArrayHandle results) { 835 // %%% take caller into account! 836 837 Thread* thread = Thread::current(); 838 839 if (k.is_null() || !k->oop_is_instance()) return -1; 840 841 int rfill = 0, rlimit = results->length(), rskip = skip; 842 // overflow measurement: 843 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 844 845 int match_flags = mflags; 846 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 847 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 848 bool local_only = !(search_superc | search_intfc); 849 bool classes_only = false; 850 851 if (name != NULL) { 852 if (name->utf8_length() == 0) return 0; // a match is not possible 853 } 854 if (sig != NULL) { 855 if (sig->utf8_length() == 0) return 0; // a match is not possible 856 if (sig->byte_at(0) == '(') 857 match_flags &= ~(IS_FIELD | IS_TYPE); 858 else 859 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 860 } 861 862 if ((match_flags & IS_TYPE) != 0) { 863 // NYI, and Core Reflection works quite well for this query 864 } 865 866 if ((match_flags & IS_FIELD) != 0) { 867 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 868 if (name != NULL && st.name() != name) 869 continue; 870 if (sig != NULL && st.signature() != sig) 871 continue; 872 // passed the filters 873 if (rskip > 0) { 874 --rskip; 875 } else if (rfill < rlimit) { 876 Handle result(thread, results->obj_at(rfill++)); 877 if (!java_lang_invoke_MemberName::is_instance(result())) 878 return -99; // caller bug! 879 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 880 if (saved != result()) 881 results->obj_at_put(rfill-1, saved); // show saved instance to user 882 } else if (++overflow >= overflow_limit) { 883 match_flags = 0; break; // got tired of looking at overflow 884 } 885 } 886 } 887 888 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 889 // watch out for these guys: 890 Symbol* init_name = vmSymbols::object_initializer_name(); 891 Symbol* clinit_name = vmSymbols::class_initializer_name(); 892 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 893 bool negate_name_test = false; 894 // fix name so that it captures the intention of IS_CONSTRUCTOR 895 if (!(match_flags & IS_METHOD)) { 896 // constructors only 897 if (name == NULL) { 898 name = init_name; 899 } else if (name != init_name) { 900 return 0; // no constructors of this method name 901 } 902 } else if (!(match_flags & IS_CONSTRUCTOR)) { 903 // methods only 904 if (name == NULL) { 905 name = init_name; 906 negate_name_test = true; // if we see the name, we *omit* the entry 907 } else if (name == init_name) { 908 return 0; // no methods of this constructor name 909 } 910 } else { 911 // caller will accept either sort; no need to adjust name 912 } 913 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 914 Method* m = st.method(); 915 Symbol* m_name = m->name(); 916 if (m_name == clinit_name) 917 continue; 918 if (name != NULL && ((m_name != name) ^ negate_name_test)) 919 continue; 920 if (sig != NULL && m->signature() != sig) 921 continue; 922 // passed the filters 923 if (rskip > 0) { 924 --rskip; 925 } else if (rfill < rlimit) { 926 Handle result(thread, results->obj_at(rfill++)); 927 if (!java_lang_invoke_MemberName::is_instance(result())) 928 return -99; // caller bug! 929 CallInfo info(m); 930 oop saved = MethodHandles::init_method_MemberName(result, info); 931 if (saved != result()) 932 results->obj_at_put(rfill-1, saved); // show saved instance to user 933 } else if (++overflow >= overflow_limit) { 934 match_flags = 0; break; // got tired of looking at overflow 935 } 936 } 937 } 938 939 // return number of elements we at leasted wanted to initialize 940 return rfill + overflow; 941 } 942 943 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 944 assert_locked_or_safepoint(CodeCache_lock); 945 946 oop context = java_lang_invoke_CallSite::context(call_site); 947 nmethodBucket* deps = java_lang_invoke_CallSite_Context::dependencies(context); 948 949 nmethodBucket* new_deps = nmethodBucket::add_dependent_nmethod(deps, nm); 950 if (deps != new_deps) { 951 java_lang_invoke_CallSite_Context::set_dependencies(context, new_deps); 952 } 953 } 954 955 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 956 assert_locked_or_safepoint(CodeCache_lock); 957 958 oop context = java_lang_invoke_CallSite::context(call_site); 959 nmethodBucket* deps = java_lang_invoke_CallSite_Context::dependencies(context); 960 961 if (nmethodBucket::remove_dependent_nmethod(deps, nm)) { 962 nmethodBucket* new_deps = nmethodBucket::clean_dependent_nmethods(deps); 963 if (deps != new_deps) { 964 java_lang_invoke_CallSite_Context::set_dependencies(context, new_deps); 965 } 966 } 967 } 968 969 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 970 assert_lock_strong(Compile_lock); 971 972 int marked = 0; 973 CallSiteDepChange changes(call_site(), target()); 974 { 975 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 976 977 oop context = java_lang_invoke_CallSite::context(call_site()); 978 nmethodBucket* deps = java_lang_invoke_CallSite_Context::dependencies(context); 979 980 marked = nmethodBucket::mark_dependent_nmethods(deps, changes); 981 if (marked > 0) { 982 nmethodBucket* new_deps = nmethodBucket::clean_dependent_nmethods(deps); 983 if (deps != new_deps) { 984 java_lang_invoke_CallSite_Context::set_dependencies(context, new_deps); 985 } 986 } 987 } 988 if (marked > 0) { 989 // At least one nmethod has been marked for deoptimization 990 VM_Deoptimize op; 991 VMThread::execute(&op); 992 } 993 } 994 995 //------------------------------------------------------------------------------ 996 // MemberNameTable 997 // 998 999 MemberNameTable::MemberNameTable(int methods_cnt) 1000 : GrowableArray<jweak>(methods_cnt, true) { 1001 assert_locked_or_safepoint(MemberNameTable_lock); 1002 } 1003 1004 MemberNameTable::~MemberNameTable() { 1005 assert_locked_or_safepoint(MemberNameTable_lock); 1006 int len = this->length(); 1007 1008 for (int idx = 0; idx < len; idx++) { 1009 jweak ref = this->at(idx); 1010 JNIHandles::destroy_weak_global(ref); 1011 } 1012 } 1013 1014 void MemberNameTable::add_member_name(jweak mem_name_wref) { 1015 assert_locked_or_safepoint(MemberNameTable_lock); 1016 this->push(mem_name_wref); 1017 } 1018 1019 #if INCLUDE_JVMTI 1020 // It is called at safepoint only for RedefineClasses 1021 void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) { 1022 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 1023 // For each redefined method 1024 for (int idx = 0; idx < length(); idx++) { 1025 oop mem_name = JNIHandles::resolve(this->at(idx)); 1026 if (mem_name == NULL) { 1027 continue; 1028 } 1029 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); 1030 1031 if (old_method == NULL || !old_method->is_old()) { 1032 continue; // skip uninteresting entries 1033 } 1034 if (old_method->is_deleted()) { 1035 // skip entries with deleted methods 1036 continue; 1037 } 1038 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); 1039 1040 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 1041 assert(old_method != new_method, "sanity check"); 1042 1043 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method); 1044 1045 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 1046 if (!(*trace_name_printed)) { 1047 // RC_TRACE_MESG macro has an embedded ResourceMark 1048 RC_TRACE_MESG(("adjust: name=%s", 1049 old_method->method_holder()->external_name())); 1050 *trace_name_printed = true; 1051 } 1052 // RC_TRACE macro has an embedded ResourceMark 1053 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)", 1054 new_method->name()->as_C_string(), 1055 new_method->signature()->as_C_string())); 1056 } 1057 } 1058 } 1059 #endif // INCLUDE_JVMTI 1060 1061 // 1062 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1063 // They are the private interface between this JVM and the HotSpot-specific 1064 // Java code that implements JSR 292 method handles. 1065 // 1066 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1067 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1068 // 1069 1070 #ifndef PRODUCT 1071 #define EACH_NAMED_CON(template, requirement) \ 1072 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1073 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1074 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1075 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1076 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1077 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1078 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1079 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1080 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1081 /*end*/ 1082 1083 #define IGNORE_REQ(req_expr) /* req_expr */ 1084 #define ONE_PLUS(scope,value) 1+ 1085 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1086 #define VALUE_COMMA(scope,value) scope::value, 1087 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1088 #define STRING_NULL(scope,value) #value "\0" 1089 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1090 1091 static bool advertise_con_value(int which) { 1092 if (which < 0) return false; 1093 bool ok = true; 1094 int count = 0; 1095 #define INC_COUNT(scope,value) \ 1096 ++count; 1097 #define CHECK_REQ(req_expr) \ 1098 if (which < count) return ok; \ 1099 ok = (req_expr); 1100 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1101 #undef INC_COUNT 1102 #undef CHECK_REQ 1103 assert(count == con_value_count, ""); 1104 if (which < count) return ok; 1105 return false; 1106 } 1107 1108 #undef ONE_PLUS 1109 #undef VALUE_COMMA 1110 #undef STRING_NULL 1111 #undef EACH_NAMED_CON 1112 #endif // PRODUCT 1113 1114 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1115 #ifndef PRODUCT 1116 if (advertise_con_value(which)) { 1117 assert(which >= 0 && which < con_value_count, ""); 1118 int con = con_values[which]; 1119 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1120 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1121 const char* str = &con_names[0]; 1122 for (int i = 0; i < which; i++) 1123 str += strlen(str) + 1; // skip name and null 1124 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1125 box->obj_at_put(0, name); 1126 } 1127 return con; 1128 } 1129 #endif 1130 return 0; 1131 } 1132 JVM_END 1133 1134 // void init(MemberName self, AccessibleObject ref) 1135 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1136 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1137 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1138 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1139 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1140 MethodHandles::init_MemberName(mname, target); 1141 } 1142 JVM_END 1143 1144 // void expand(MemberName self) 1145 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1146 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1147 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1148 MethodHandles::expand_MemberName(mname, 0, CHECK); 1149 } 1150 JVM_END 1151 1152 // void resolve(MemberName self, Class<?> caller) 1153 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1154 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1155 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1156 1157 // The trusted Java code that calls this method should already have performed 1158 // access checks on behalf of the given caller. But, we can verify this. 1159 if (VerifyMethodHandles && caller_jh != NULL && 1160 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1161 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1162 if (reference_klass != NULL && reference_klass->oop_is_objArray()) { 1163 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1164 } 1165 1166 // Reflection::verify_class_access can only handle instance classes. 1167 if (reference_klass != NULL && reference_klass->oop_is_instance()) { 1168 // Emulate LinkResolver::check_klass_accessability. 1169 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1170 if (!Reflection::verify_class_access(caller, 1171 reference_klass, 1172 true)) { 1173 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1174 } 1175 } 1176 } 1177 1178 KlassHandle caller(THREAD, 1179 caller_jh == NULL ? (Klass*) NULL : 1180 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh))); 1181 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1182 1183 if (resolved.is_null()) { 1184 int flags = java_lang_invoke_MemberName::flags(mname()); 1185 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1186 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1187 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1188 } 1189 if ((flags & ALL_KINDS) == IS_FIELD) { 1190 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); 1191 } else if ((flags & ALL_KINDS) == IS_METHOD || 1192 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1193 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); 1194 } else { 1195 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1196 } 1197 } 1198 1199 return JNIHandles::make_local(THREAD, resolved()); 1200 } 1201 JVM_END 1202 1203 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1204 if (mname == NULL || 1205 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1206 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1207 } else { 1208 int flags = java_lang_invoke_MemberName::flags(mname); 1209 if ((flags & IS_FIELD) != 0 && 1210 (must_be_static 1211 ? (flags & JVM_ACC_STATIC) != 0 1212 : (flags & JVM_ACC_STATIC) == 0)) { 1213 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1214 return (jlong) vmindex; 1215 } 1216 } 1217 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1218 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1219 return 0; 1220 } 1221 1222 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1223 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1224 } 1225 JVM_END 1226 1227 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1228 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1229 } 1230 JVM_END 1231 1232 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1233 // use the other function to perform sanity checks: 1234 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1235 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1236 return JNIHandles::make_local(THREAD, clazz); 1237 } 1238 JVM_END 1239 1240 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1241 if (mname_jh == NULL) return NULL; 1242 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1243 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1244 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1245 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1246 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1247 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1248 result->obj_at_put(0, x); 1249 x = NULL; 1250 if (vmtarget == NULL) { 1251 x = NULL; 1252 } else if (vmtarget->is_klass()) { 1253 x = ((Klass*) vmtarget)->java_mirror(); 1254 } else if (vmtarget->is_method()) { 1255 x = mname(); 1256 } 1257 result->obj_at_put(1, x); 1258 return JNIHandles::make_local(env, result()); 1259 } 1260 JVM_END 1261 1262 1263 1264 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1265 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1266 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1267 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1268 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1269 if (clazz_jh == NULL || results_jh == NULL) return -1; 1270 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); 1271 1272 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1273 if (results.is_null() || !results->is_objArray()) return -1; 1274 1275 TempNewSymbol name = NULL; 1276 TempNewSymbol sig = NULL; 1277 if (name_jh != NULL) { 1278 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1279 if (name == NULL) return 0; // a match is not possible 1280 } 1281 if (sig_jh != NULL) { 1282 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1283 if (sig == NULL) return 0; // a match is not possible 1284 } 1285 1286 KlassHandle caller; 1287 if (caller_jh != NULL) { 1288 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1289 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1290 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); 1291 } 1292 1293 if (name != NULL && sig != NULL && results.not_null()) { 1294 // try a direct resolve 1295 // %%% TO DO 1296 } 1297 1298 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1299 caller, skip, results); 1300 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1301 return res; 1302 } 1303 JVM_END 1304 1305 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1306 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1307 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1308 { 1309 // Walk all nmethods depending on this call site. 1310 MutexLocker mu(Compile_lock, thread); 1311 MethodHandles::flush_dependent_nmethods(call_site, target); 1312 java_lang_invoke_CallSite::set_target(call_site(), target()); 1313 } 1314 } 1315 JVM_END 1316 1317 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1318 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1319 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1320 { 1321 // Walk all nmethods depending on this call site. 1322 MutexLocker mu(Compile_lock, thread); 1323 MethodHandles::flush_dependent_nmethods(call_site, target); 1324 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1325 } 1326 } 1327 JVM_END 1328 1329 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1330 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1331 { 1332 // Walk all nmethods depending on this call site. 1333 MutexLocker mu1(Compile_lock, thread); 1334 1335 int marked = 0; 1336 { 1337 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1338 nmethodBucket* b = java_lang_invoke_CallSite_Context::dependencies(context()); 1339 while(b != NULL) { 1340 nmethod* nm = b->get_nmethod(); 1341 if (b->count() > 0 && nm->is_alive() && !nm->is_marked_for_deoptimization()) { 1342 nm->mark_for_deoptimization(); 1343 marked++; 1344 } 1345 nmethodBucket* next = b->next(); 1346 delete b; 1347 b = next; 1348 } 1349 java_lang_invoke_CallSite_Context::set_dependencies(context(), NULL); // reset context 1350 } 1351 if (marked > 0) { 1352 // At least one nmethod has been marked for deoptimization 1353 VM_Deoptimize op; 1354 VMThread::execute(&op); 1355 } 1356 } 1357 } 1358 JVM_END 1359 1360 /** 1361 * Throws a java/lang/UnsupportedOperationException unconditionally. 1362 * This is required by the specification of MethodHandle.invoke if 1363 * invoked directly. 1364 */ 1365 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1366 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1367 return NULL; 1368 } 1369 JVM_END 1370 1371 /** 1372 * Throws a java/lang/UnsupportedOperationException unconditionally. 1373 * This is required by the specification of MethodHandle.invokeExact if 1374 * invoked directly. 1375 */ 1376 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1377 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1378 return NULL; 1379 } 1380 JVM_END 1381 1382 /// JVM_RegisterMethodHandleMethods 1383 1384 #undef CS // Solaris builds complain 1385 1386 #define LANG "Ljava/lang/" 1387 #define JLINV "Ljava/lang/invoke/" 1388 1389 #define OBJ LANG"Object;" 1390 #define CLS LANG"Class;" 1391 #define STRG LANG"String;" 1392 #define CS JLINV"CallSite;" 1393 #define CTX JLINV"CallSite$Context;" 1394 #define MT JLINV"MethodType;" 1395 #define MH JLINV"MethodHandle;" 1396 #define MEM JLINV"MemberName;" 1397 1398 #define CC (char*) /*cast a literal from (const char*)*/ 1399 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1400 1401 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1402 static JNINativeMethod MHN_methods[] = { 1403 {CC"init", CC"("MEM""OBJ")V", FN_PTR(MHN_init_Mem)}, 1404 {CC"expand", CC"("MEM")V", FN_PTR(MHN_expand_Mem)}, 1405 {CC"resolve", CC"("MEM""CLS")"MEM, FN_PTR(MHN_resolve_Mem)}, 1406 // static native int getNamedCon(int which, Object[] name) 1407 {CC"getNamedCon", CC"(I["OBJ")I", FN_PTR(MHN_getNamedCon)}, 1408 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1409 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1410 {CC"getMembers", CC"("CLS""STRG""STRG"I"CLS"I["MEM")I", FN_PTR(MHN_getMembers)}, 1411 {CC"objectFieldOffset", CC"("MEM")J", FN_PTR(MHN_objectFieldOffset)}, 1412 {CC"setCallSiteTargetNormal", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1413 {CC"setCallSiteTargetVolatile", CC"("CS""MH")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1414 {CC"clearCallSiteContext", CC"("CTX")V", FN_PTR(MHN_clearCallSiteContext)}, 1415 {CC"staticFieldOffset", CC"("MEM")J", FN_PTR(MHN_staticFieldOffset)}, 1416 {CC"staticFieldBase", CC"("MEM")"OBJ, FN_PTR(MHN_staticFieldBase)}, 1417 {CC"getMemberVMInfo", CC"("MEM")"OBJ, FN_PTR(MHN_getMemberVMInfo)} 1418 }; 1419 1420 static JNINativeMethod MH_methods[] = { 1421 // UnsupportedOperationException throwers 1422 {CC"invoke", CC"(["OBJ")"OBJ, FN_PTR(MH_invoke_UOE)}, 1423 {CC"invokeExact", CC"(["OBJ")"OBJ, FN_PTR(MH_invokeExact_UOE)} 1424 }; 1425 1426 /** 1427 * Helper method to register native methods. 1428 */ 1429 static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1430 int status = env->RegisterNatives(clazz, methods, nMethods); 1431 if (status != JNI_OK || env->ExceptionOccurred()) { 1432 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 1433 env->ExceptionClear(); 1434 return false; 1435 } 1436 return true; 1437 } 1438 1439 /** 1440 * This one function is exported, used by NativeLookup. 1441 */ 1442 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1443 assert(!MethodHandles::enabled(), "must not be enabled"); 1444 bool enable_MH = true; 1445 1446 jclass MH_class = NULL; 1447 if (SystemDictionary::MethodHandle_klass() == NULL) { 1448 enable_MH = false; 1449 } else { 1450 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1451 MH_class = (jclass) JNIHandles::make_local(env, mirror); 1452 } 1453 1454 if (enable_MH) { 1455 ThreadToNativeFromVM ttnfv(thread); 1456 1457 if (enable_MH) { 1458 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1459 } 1460 if (enable_MH) { 1461 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1462 } 1463 } 1464 1465 if (TraceInvokeDynamic) { 1466 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1467 } 1468 1469 if (enable_MH) { 1470 if (MethodHandles::generate_adapters() == false) { 1471 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters"); 1472 } 1473 MethodHandles::set_enabled(true); 1474 } 1475 } 1476 JVM_END