1 /* 2 * Copyright (c) 2008, 2017, 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/dependencyContext.hpp" 30 #include "compiler/compileBroker.hpp" 31 #include "interpreter/interpreter.hpp" 32 #include "interpreter/oopMapCache.hpp" 33 #include "interpreter/linkResolver.hpp" 34 #include "memory/allocation.inline.hpp" 35 #include "memory/oopFactory.hpp" 36 #include "memory/resourceArea.hpp" 37 #include "oops/objArrayOop.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "prims/methodHandles.hpp" 40 #include "runtime/compilationPolicy.hpp" 41 #include "runtime/javaCalls.hpp" 42 #include "runtime/timerTrace.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 * Generates method handle adapters. Returns 'false' if memory allocation 68 * failed and true otherwise. 69 */ 70 void MethodHandles::generate_adapters() { 71 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 72 assert(_adapter_code == NULL, "generate only once"); 73 74 ResourceMark rm; 75 TraceTime timer("MethodHandles adapters generation", TRACETIME_LOG(Info, startuptime)); 76 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 77 CodeBuffer code(_adapter_code); 78 MethodHandlesAdapterGenerator g(&code); 79 g.generate(); 80 code.log_section_sizes("MethodHandlesAdapterBlob"); 81 } 82 83 //------------------------------------------------------------------------------ 84 // MethodHandlesAdapterGenerator::generate 85 // 86 void MethodHandlesAdapterGenerator::generate() { 87 // Generate generic method handle adapters. 88 // Generate interpreter entries 89 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 90 mk <= Interpreter::method_handle_invoke_LAST; 91 mk = Interpreter::MethodKind(1 + (int)mk)) { 92 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 93 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 94 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 95 if (entry != NULL) { 96 Interpreter::set_entry_for_kind(mk, entry); 97 } 98 // If the entry is not set, it will throw AbstractMethodError. 99 } 100 } 101 102 void MethodHandles::set_enabled(bool z) { 103 if (_enabled != z) { 104 guarantee(z, "can only enable once"); 105 _enabled = z; 106 } 107 } 108 109 // MemberName support 110 111 // import java_lang_invoke_MemberName.* 112 enum { 113 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 114 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 115 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 116 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 117 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 118 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 119 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 120 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 121 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 122 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 123 }; 124 125 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) { 126 // This method is used from java.lang.invoke.MemberName constructors. 127 // It fills in the new MemberName from a java.lang.reflect.Member. 128 Thread* thread = Thread::current(); 129 oop target_oop = target(); 130 Klass* target_klass = target_oop->klass(); 131 if (target_klass == SystemDictionary::reflect_Field_klass()) { 132 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 133 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 134 Klass* k = java_lang_Class::as_Klass(clazz); 135 if (k != NULL && k->is_instance_klass()) { 136 fieldDescriptor fd(InstanceKlass::cast(k), slot); 137 oop mname2 = init_field_MemberName(mname, fd); 138 if (mname2 != NULL) { 139 // Since we have the reified name and type handy, add them to the result. 140 if (java_lang_invoke_MemberName::name(mname2) == NULL) 141 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 142 if (java_lang_invoke_MemberName::type(mname2) == NULL) 143 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 144 } 145 return mname2; 146 } 147 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 148 oop clazz = java_lang_reflect_Method::clazz(target_oop); 149 int slot = java_lang_reflect_Method::slot(target_oop); 150 Klass* k = java_lang_Class::as_Klass(clazz); 151 if (k != NULL && k->is_instance_klass()) { 152 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 153 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 154 return NULL; // do not resolve unless there is a concrete signature 155 CallInfo info(m, k, CHECK_NULL); 156 return init_method_MemberName(mname, info); 157 } 158 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 159 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 160 int slot = java_lang_reflect_Constructor::slot(target_oop); 161 Klass* k = java_lang_Class::as_Klass(clazz); 162 if (k != NULL && k->is_instance_klass()) { 163 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 164 if (m == NULL) return NULL; 165 CallInfo info(m, k, CHECK_NULL); 166 return init_method_MemberName(mname, info); 167 } 168 } 169 return NULL; 170 } 171 172 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 173 assert(info.resolved_appendix().is_null(), "only normal methods here"); 174 methodHandle m = info.resolved_method(); 175 assert(m.not_null(), "null method handle"); 176 Klass* m_klass = m->method_holder(); 177 assert(m_klass != NULL, "null holder for method handle"); 178 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 179 int vmindex = Method::invalid_vtable_index; 180 181 switch (info.call_kind()) { 182 case CallInfo::itable_call: 183 vmindex = info.itable_index(); 184 // More importantly, the itable index only works with the method holder. 185 assert(m_klass->verify_itable_index(vmindex), ""); 186 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 187 if (TraceInvokeDynamic) { 188 ttyLocker ttyl; 189 ResourceMark rm; 190 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 191 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 192 vmindex); 193 m->access_flags().print_on(tty); 194 if (!m->is_abstract()) { 195 tty->print("default"); 196 } 197 tty->cr(); 198 } 199 break; 200 201 case CallInfo::vtable_call: 202 vmindex = info.vtable_index(); 203 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 204 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe"); 205 if (m_klass->is_interface()) { 206 // This is a vtable call to an interface method (abstract "miranda method" or default method). 207 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 208 // (LinkResolver should help us figure this out.) 209 Klass* m_klass_non_interface = info.resolved_klass(); 210 if (m_klass_non_interface->is_interface()) { 211 m_klass_non_interface = SystemDictionary::Object_klass(); 212 #ifdef ASSERT 213 { ResourceMark rm; 214 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex); 215 assert(m->name() == m2->name() && m->signature() == m2->signature(), 216 "at %d, %s != %s", vmindex, 217 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 218 } 219 #endif //ASSERT 220 } 221 if (!m->is_public()) { 222 assert(m->is_public(), "virtual call must be to public interface method"); 223 return NULL; // elicit an error later in product build 224 } 225 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe"); 226 m_klass = m_klass_non_interface; 227 } 228 if (TraceInvokeDynamic) { 229 ttyLocker ttyl; 230 ResourceMark rm; 231 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 232 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 233 m_klass->internal_name(), vmindex); 234 m->access_flags().print_on(tty); 235 if (m->is_default_method()) { 236 tty->print("default"); 237 } 238 tty->cr(); 239 } 240 break; 241 242 case CallInfo::direct_call: 243 vmindex = Method::nonvirtual_vtable_index; 244 if (m->is_static()) { 245 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 246 } else if (m->is_initializer()) { 247 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 248 } else { 249 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 250 } 251 break; 252 253 default: assert(false, "bad CallInfo"); return NULL; 254 } 255 256 // @CallerSensitive annotation detected 257 if (m->caller_sensitive()) { 258 flags |= CALLER_SENSITIVE; 259 } 260 261 Handle resolved_method = info.resolved_method_name(); 262 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(), 263 "Should not change after link resolultion"); 264 265 oop mname_oop = mname(); 266 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 267 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method()); 268 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index 269 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror()); 270 // Note: name and type can be lazily computed by resolve_MemberName, 271 // if Java code needs them as resolved String and MethodType objects. 272 // If relevant, the vtable or itable value is stored as vmindex. 273 // This is done eagerly, since it is readily available without 274 // constructing any new objects. 275 return mname(); 276 } 277 278 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 279 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 280 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 281 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 282 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 283 284 oop mname_oop = mname(); 285 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 286 java_lang_invoke_MemberName::set_method (mname_oop, NULL); 287 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 288 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror()); 289 290 oop type = field_signature_type_or_null(fd.signature()); 291 oop name = field_name_or_null(fd.name()); 292 if (name != NULL) 293 java_lang_invoke_MemberName::set_name(mname_oop, name); 294 if (type != NULL) 295 java_lang_invoke_MemberName::set_type(mname_oop, type); 296 // Note: name and type can be lazily computed by resolve_MemberName, 297 // if Java code needs them as resolved String and Class objects. 298 // Note that the incoming type oop might be pre-resolved (non-null). 299 // The base clazz and field offset (vmindex) must be eagerly stored, 300 // because they unambiguously identify the field. 301 // Although the fieldDescriptor::_index would also identify the field, 302 // we do not use it, because it is harder to decode. 303 // TO DO: maybe intern mname_oop 304 return mname(); 305 } 306 307 // JVM 2.9 Special Methods: 308 // A method is signature polymorphic if and only if all of the following conditions hold : 309 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes. 310 // * It has a single formal parameter of type Object[]. 311 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. 312 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 313 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 314 if (klass == NULL) 315 return false; 316 // The following test will fail spuriously during bootstrap of MethodHandle itself: 317 // if (klass != SystemDictionary::MethodHandle_klass()) 318 // Test the name instead: 319 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() && 320 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { 321 return false; 322 } 323 324 // Look up signature polymorphic method with polymorphic return type 325 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 326 InstanceKlass* iklass = InstanceKlass::cast(klass); 327 Method* m = iklass->find_method(name, poly_sig); 328 if (m != NULL) { 329 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 330 int flags = m->access_flags().as_int(); 331 if ((flags & required) == required) { 332 return true; 333 } 334 } 335 336 // Look up signature polymorphic method with non-polymorphic (non Object) return type 337 int me; 338 int ms = iklass->find_method_by_name(name, &me); 339 if (ms == -1) return false; 340 for (; ms < me; ms++) { 341 Method* m = iklass->methods()->at(ms); 342 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 343 int flags = m->access_flags().as_int(); 344 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 345 return true; 346 } 347 } 348 return false; 349 } 350 351 352 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 353 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 354 switch (iid) { 355 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 356 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 357 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 358 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 359 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 360 } 361 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 362 return 0; 363 } 364 365 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 366 switch(id) { 367 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 368 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 369 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 370 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 371 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 372 default: 373 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 374 return Bytecodes::_illegal; 375 } 376 } 377 378 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 379 switch (iid) { 380 case vmIntrinsics::_invokeBasic: return 0; 381 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 382 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 383 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 384 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 385 } 386 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 387 return 0; 388 } 389 390 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 391 vmSymbols::SID name_id = vmSymbols::find_sid(name); 392 switch (name_id) { 393 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 394 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 395 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 396 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 397 398 // There is one static signature-polymorphic method for each JVM invocation mode. 399 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 400 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 401 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 402 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 403 } 404 405 // Cover the case of invokeExact and any future variants of invokeFoo. 406 Klass* mh_klass = SystemDictionary::well_known_klass( 407 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 408 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) { 409 return vmIntrinsics::_invokeGeneric; 410 } 411 412 // Cover the case of methods on VarHandle. 413 Klass* vh_klass = SystemDictionary::well_known_klass( 414 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) ); 415 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) { 416 return vmIntrinsics::_invokeGeneric; 417 } 418 419 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 420 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 421 return vmIntrinsics::_none; 422 } 423 424 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 425 if (klass != NULL && 426 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() || 427 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { 428 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 429 if (iid != vmIntrinsics::_none) 430 return iid; 431 if (is_method_handle_invoke_name(klass, name)) 432 return vmIntrinsics::_invokeGeneric; 433 } 434 return vmIntrinsics::_none; 435 } 436 437 438 // convert the external string or reflective type to an internal signature 439 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 440 if (java_lang_invoke_MethodType::is_instance(type_str)) { 441 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 442 } else if (java_lang_Class::is_instance(type_str)) { 443 return java_lang_Class::as_signature(type_str, false, THREAD); 444 } else if (java_lang_String::is_instance_inlined(type_str)) { 445 if (intern_if_not_found) { 446 return java_lang_String::as_symbol(type_str, THREAD); 447 } else { 448 return java_lang_String::as_symbol_or_null(type_str); 449 } 450 } else { 451 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 452 } 453 } 454 455 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 456 enum { OBJ_SIG_LEN = 18 }; 457 458 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 459 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 460 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 461 const int len = sig->utf8_length(); 462 for (int i = 0; i < len; i++) { 463 switch (sig->byte_at(i)) { 464 case 'L': 465 // only java/lang/Object is valid here 466 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 467 return false; 468 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 469 continue; 470 case '(': case ')': case 'V': 471 case 'I': case 'J': case 'F': case 'D': 472 continue; 473 //case '[': 474 //case 'Z': case 'B': case 'C': case 'S': 475 default: 476 return false; 477 } 478 } 479 return true; 480 } 481 482 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 483 Symbol* bsig = NULL; 484 if (sig == NULL) { 485 return sig; 486 } else if (is_basic_type_signature(sig)) { 487 sig->increment_refcount(); 488 return sig; // that was easy 489 } else if (sig->byte_at(0) != '(') { 490 BasicType bt = char2type(sig->byte_at(0)); 491 if (is_subword_type(bt)) { 492 bsig = vmSymbols::int_signature(); 493 } else { 494 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 495 bsig = vmSymbols::object_signature(); 496 } 497 } else { 498 ResourceMark rm; 499 stringStream buffer(128); 500 buffer.put('('); 501 int arg_pos = 0, keep_arg_pos = -1; 502 if (keep_last_arg) 503 keep_arg_pos = ArgumentCount(sig).size() - 1; 504 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 505 BasicType bt = ss.type(); 506 size_t this_arg_pos = buffer.size(); 507 if (ss.at_return_type()) { 508 buffer.put(')'); 509 } 510 if (arg_pos == keep_arg_pos) { 511 buffer.write((char*) ss.raw_bytes(), 512 (int) ss.raw_length()); 513 } else if (bt == T_OBJECT || bt == T_ARRAY) { 514 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 515 } else { 516 if (is_subword_type(bt)) 517 bt = T_INT; 518 buffer.put(type2char(bt)); 519 } 520 arg_pos++; 521 } 522 const char* sigstr = buffer.base(); 523 int siglen = (int) buffer.size(); 524 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 525 } 526 assert(is_basic_type_signature(bsig) || 527 // detune assert in case the injected argument is not a basic type: 528 keep_last_arg, ""); 529 return bsig; 530 } 531 532 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 533 Symbol* sig, 534 bool keep_arrays, 535 bool keep_basic_names) { 536 st = st ? st : tty; 537 int len = sig->utf8_length(); 538 int array = 0; 539 bool prev_type = false; 540 for (int i = 0; i < len; i++) { 541 char ch = sig->byte_at(i); 542 switch (ch) { 543 case '(': case ')': 544 prev_type = false; 545 st->put(ch); 546 continue; 547 case '[': 548 if (!keep_basic_names && keep_arrays) 549 st->put(ch); 550 array++; 551 continue; 552 case 'L': 553 { 554 if (prev_type) st->put(','); 555 int start = i+1, slash = start; 556 while (++i < len && (ch = sig->byte_at(i)) != ';') { 557 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 558 } 559 if (slash < i) start = slash; 560 if (!keep_basic_names) { 561 st->put('L'); 562 } else { 563 for (int j = start; j < i; j++) 564 st->put(sig->byte_at(j)); 565 prev_type = true; 566 } 567 break; 568 } 569 default: 570 { 571 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 572 ch = '['; 573 array = 0; 574 } 575 if (prev_type) st->put(','); 576 const char* n = NULL; 577 if (keep_basic_names) 578 n = type2name(char2type(ch)); 579 if (n == NULL) { 580 // unknown letter, or we don't want to know its name 581 st->put(ch); 582 } else { 583 st->print("%s", n); 584 prev_type = true; 585 } 586 break; 587 } 588 } 589 // Switch break goes here to take care of array suffix: 590 if (prev_type) { 591 while (array > 0) { 592 st->print("[]"); 593 --array; 594 } 595 } 596 array = 0; 597 } 598 } 599 600 601 602 static oop object_java_mirror() { 603 return SystemDictionary::Object_klass()->java_mirror(); 604 } 605 606 oop MethodHandles::field_name_or_null(Symbol* s) { 607 if (s == NULL) return NULL; 608 return StringTable::lookup(s); 609 } 610 611 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 612 if (s == NULL) return NULL; 613 BasicType bt = FieldType::basic_type(s); 614 if (is_java_primitive(bt)) { 615 assert(s->utf8_length() == 1, ""); 616 return java_lang_Class::primitive_mirror(bt); 617 } 618 // Here are some more short cuts for common types. 619 // They are optional, since reference types can be resolved lazily. 620 if (bt == T_OBJECT) { 621 if (s == vmSymbols::object_signature()) { 622 return object_java_mirror(); 623 } else if (s == vmSymbols::class_signature()) { 624 return SystemDictionary::Class_klass()->java_mirror(); 625 } else if (s == vmSymbols::string_signature()) { 626 return SystemDictionary::String_klass()->java_mirror(); 627 } 628 } 629 return NULL; 630 } 631 632 633 // An unresolved member name is a mere symbolic reference. 634 // Resolving it plants a vmtarget/vmindex in it, 635 // which refers directly to JVM internals. 636 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, TRAPS) { 637 Handle empty; 638 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 639 640 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 641 // Already resolved. 642 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 643 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 644 return mname; 645 } 646 647 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 648 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 649 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 650 int flags = java_lang_invoke_MemberName::flags(mname()); 651 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 652 if (!ref_kind_is_valid(ref_kind)) { 653 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 654 } 655 656 DEBUG_ONLY(int old_vmindex); 657 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 658 659 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 660 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 661 } 662 663 InstanceKlass* defc = NULL; 664 { 665 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 666 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 667 if (!defc_klass->is_instance_klass()) { 668 if (!defc_klass->is_array_klass()) return empty; 669 defc_klass = SystemDictionary::Object_klass(); 670 } 671 defc = InstanceKlass::cast(defc_klass); 672 } 673 if (defc == NULL) { 674 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 675 } 676 defc->link_class(CHECK_(empty)); // possible safepoint 677 678 // convert the external string name to an internal symbol 679 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 680 if (name == NULL) return empty; // no such name 681 if (name == vmSymbols::class_initializer_name()) 682 return empty; // illegal name 683 684 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 685 if ((flags & ALL_KINDS) == IS_METHOD && 686 (defc == SystemDictionary::MethodHandle_klass()) && 687 (ref_kind == JVM_REF_invokeVirtual || 688 ref_kind == JVM_REF_invokeSpecial || 689 // static invocation mode is required for _linkToVirtual, etc.: 690 ref_kind == JVM_REF_invokeStatic)) { 691 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 692 if (iid != vmIntrinsics::_none && 693 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 694 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 695 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 696 mh_invoke_id = iid; 697 } 698 } 699 700 // convert the external string or reflective type to an internal signature 701 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 702 if (type == NULL) return empty; // no such signature exists in the VM 703 704 LinkInfo::AccessCheck access_check = caller != NULL ? 705 LinkInfo::needs_access_check : 706 LinkInfo::skip_access_check; 707 708 // Time to do the lookup. 709 switch (flags & ALL_KINDS) { 710 case IS_METHOD: 711 { 712 CallInfo result; 713 LinkInfo link_info(defc, name, type, caller, access_check); 714 { 715 assert(!HAS_PENDING_EXCEPTION, ""); 716 if (ref_kind == JVM_REF_invokeStatic) { 717 LinkResolver::resolve_static_call(result, 718 link_info, false, THREAD); 719 } else if (ref_kind == JVM_REF_invokeInterface) { 720 LinkResolver::resolve_interface_call(result, Handle(), defc, 721 link_info, false, THREAD); 722 } else if (mh_invoke_id != vmIntrinsics::_none) { 723 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 724 LinkResolver::resolve_handle_call(result, link_info, THREAD); 725 } else if (ref_kind == JVM_REF_invokeSpecial) { 726 LinkResolver::resolve_special_call(result, Handle(), 727 link_info, THREAD); 728 } else if (ref_kind == JVM_REF_invokeVirtual) { 729 LinkResolver::resolve_virtual_call(result, Handle(), defc, 730 link_info, false, THREAD); 731 } else { 732 assert(false, "ref_kind=%d", ref_kind); 733 } 734 if (HAS_PENDING_EXCEPTION) { 735 return empty; 736 } 737 } 738 if (result.resolved_appendix().not_null()) { 739 // The resolved MemberName must not be accompanied by an appendix argument, 740 // since there is no way to bind this value into the MemberName. 741 // Caller is responsible to prevent this from happening. 742 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 743 } 744 result.set_resolved_method_name(CHECK_(empty)); 745 oop mname2 = init_method_MemberName(mname, result); 746 return Handle(THREAD, mname2); 747 } 748 case IS_CONSTRUCTOR: 749 { 750 CallInfo result; 751 LinkInfo link_info(defc, name, type, caller, access_check); 752 { 753 assert(!HAS_PENDING_EXCEPTION, ""); 754 if (name == vmSymbols::object_initializer_name()) { 755 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD); 756 } else { 757 break; // will throw after end of switch 758 } 759 if (HAS_PENDING_EXCEPTION) { 760 return empty; 761 } 762 } 763 assert(result.is_statically_bound(), ""); 764 result.set_resolved_method_name(CHECK_(empty)); 765 oop mname2 = init_method_MemberName(mname, result); 766 return Handle(THREAD, mname2); 767 } 768 case IS_FIELD: 769 { 770 fieldDescriptor result; // find_field initializes fd if found 771 { 772 assert(!HAS_PENDING_EXCEPTION, ""); 773 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check); 774 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 775 if (HAS_PENDING_EXCEPTION) { 776 return empty; 777 } 778 } 779 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 780 return Handle(THREAD, mname2); 781 } 782 default: 783 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 784 } 785 786 return empty; 787 } 788 789 // Conversely, a member name which is only initialized from JVM internals 790 // may have null defc, name, and type fields. 791 // Resolving it plants a vmtarget/vmindex in it, 792 // which refers directly to JVM internals. 793 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 794 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 795 796 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 797 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 798 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 799 int flags = java_lang_invoke_MemberName::flags(mname()); 800 801 if (suppress != 0) { 802 if (suppress & _suppress_defc) have_defc = true; 803 if (suppress & _suppress_name) have_name = true; 804 if (suppress & _suppress_type) have_type = true; 805 } 806 807 if (have_defc && have_name && have_type) return; // nothing needed 808 809 switch (flags & ALL_KINDS) { 810 case IS_METHOD: 811 case IS_CONSTRUCTOR: 812 { 813 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 814 if (vmtarget == NULL) { 815 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 816 } 817 methodHandle m(THREAD, vmtarget); 818 DEBUG_ONLY(vmtarget = NULL); // safety 819 if (!have_defc) { 820 InstanceKlass* defc = m->method_holder(); 821 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 822 } 823 if (!have_name) { 824 //not java_lang_String::create_from_symbol; let's intern member names 825 oop name = StringTable::intern(m->name(), CHECK); 826 java_lang_invoke_MemberName::set_name(mname(), name); 827 } 828 if (!have_type) { 829 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 830 java_lang_invoke_MemberName::set_type(mname(), type()); 831 } 832 return; 833 } 834 case IS_FIELD: 835 { 836 oop clazz = java_lang_invoke_MemberName::clazz(mname()); 837 if (clazz == NULL) { 838 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)"); 839 } 840 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz)); 841 DEBUG_ONLY(clazz = NULL); // safety 842 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 843 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 844 fieldDescriptor fd; // find_field initializes fd if found 845 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 846 break; // cannot expand 847 if (!have_name) { 848 //not java_lang_String::create_from_symbol; let's intern member names 849 oop name = StringTable::intern(fd.name(), CHECK); 850 java_lang_invoke_MemberName::set_name(mname(), name); 851 } 852 if (!have_type) { 853 // If it is a primitive field type, don't mess with short strings like "I". 854 Handle type (THREAD, field_signature_type_or_null(fd.signature())); 855 if (type.is_null()) { 856 type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 857 } 858 java_lang_invoke_MemberName::set_type(mname(), type()); 859 } 860 return; 861 } 862 } 863 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 864 } 865 866 int MethodHandles::find_MemberNames(Klass* k, 867 Symbol* name, Symbol* sig, 868 int mflags, Klass* caller, 869 int skip, objArrayHandle results, TRAPS) { 870 // %%% take caller into account! 871 872 Thread* thread = Thread::current(); 873 874 if (k == NULL || !k->is_instance_klass()) return -1; 875 876 int rfill = 0, rlimit = results->length(), rskip = skip; 877 // overflow measurement: 878 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 879 880 int match_flags = mflags; 881 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 882 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 883 bool local_only = !(search_superc | search_intfc); 884 bool classes_only = false; 885 886 if (name != NULL) { 887 if (name->utf8_length() == 0) return 0; // a match is not possible 888 } 889 if (sig != NULL) { 890 if (sig->utf8_length() == 0) return 0; // a match is not possible 891 if (sig->byte_at(0) == '(') 892 match_flags &= ~(IS_FIELD | IS_TYPE); 893 else 894 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 895 } 896 897 if ((match_flags & IS_TYPE) != 0) { 898 // NYI, and Core Reflection works quite well for this query 899 } 900 901 if ((match_flags & IS_FIELD) != 0) { 902 InstanceKlass* ik = InstanceKlass::cast(k); 903 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 904 if (name != NULL && st.name() != name) 905 continue; 906 if (sig != NULL && st.signature() != sig) 907 continue; 908 // passed the filters 909 if (rskip > 0) { 910 --rskip; 911 } else if (rfill < rlimit) { 912 Handle result(thread, results->obj_at(rfill++)); 913 if (!java_lang_invoke_MemberName::is_instance(result())) 914 return -99; // caller bug! 915 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 916 if (saved != result()) 917 results->obj_at_put(rfill-1, saved); // show saved instance to user 918 } else if (++overflow >= overflow_limit) { 919 match_flags = 0; break; // got tired of looking at overflow 920 } 921 } 922 } 923 924 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 925 // watch out for these guys: 926 Symbol* init_name = vmSymbols::object_initializer_name(); 927 Symbol* clinit_name = vmSymbols::class_initializer_name(); 928 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 929 bool negate_name_test = false; 930 // fix name so that it captures the intention of IS_CONSTRUCTOR 931 if (!(match_flags & IS_METHOD)) { 932 // constructors only 933 if (name == NULL) { 934 name = init_name; 935 } else if (name != init_name) { 936 return 0; // no constructors of this method name 937 } 938 } else if (!(match_flags & IS_CONSTRUCTOR)) { 939 // methods only 940 if (name == NULL) { 941 name = init_name; 942 negate_name_test = true; // if we see the name, we *omit* the entry 943 } else if (name == init_name) { 944 return 0; // no methods of this constructor name 945 } 946 } else { 947 // caller will accept either sort; no need to adjust name 948 } 949 InstanceKlass* ik = InstanceKlass::cast(k); 950 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 951 Method* m = st.method(); 952 Symbol* m_name = m->name(); 953 if (m_name == clinit_name) 954 continue; 955 if (name != NULL && ((m_name != name) ^ negate_name_test)) 956 continue; 957 if (sig != NULL && m->signature() != sig) 958 continue; 959 // passed the filters 960 if (rskip > 0) { 961 --rskip; 962 } else if (rfill < rlimit) { 963 Handle result(thread, results->obj_at(rfill++)); 964 if (!java_lang_invoke_MemberName::is_instance(result())) 965 return -99; // caller bug! 966 CallInfo info(m, NULL, CHECK_0); 967 oop saved = MethodHandles::init_method_MemberName(result, info); 968 if (saved != result()) 969 results->obj_at_put(rfill-1, saved); // show saved instance to user 970 } else if (++overflow >= overflow_limit) { 971 match_flags = 0; break; // got tired of looking at overflow 972 } 973 } 974 } 975 976 // return number of elements we at leasted wanted to initialize 977 return rfill + overflow; 978 } 979 980 // Is it safe to remove stale entries from a dependency list? 981 static bool safe_to_expunge() { 982 // Since parallel GC threads can concurrently iterate over a dependency 983 // list during safepoint, it is safe to remove entries only when 984 // CodeCache lock is held. 985 return CodeCache_lock->owned_by_self(); 986 } 987 988 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 989 assert_locked_or_safepoint(CodeCache_lock); 990 991 oop context = java_lang_invoke_CallSite::context(call_site); 992 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 993 // Try to purge stale entries on updates. 994 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 995 // in order to avoid memory leak, stale entries are purged whenever a dependency list 996 // is changed (both on addition and removal). Though memory reclamation is delayed, 997 // it avoids indefinite memory usage growth. 998 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 999 } 1000 1001 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 1002 assert_locked_or_safepoint(CodeCache_lock); 1003 1004 oop context = java_lang_invoke_CallSite::context(call_site); 1005 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1006 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 1007 } 1008 1009 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 1010 assert_lock_strong(Compile_lock); 1011 1012 int marked = 0; 1013 CallSiteDepChange changes(call_site, target); 1014 { 1015 NoSafepointVerifier nsv; 1016 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1017 1018 oop context = java_lang_invoke_CallSite::context(call_site()); 1019 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1020 marked = deps.mark_dependent_nmethods(changes); 1021 } 1022 if (marked > 0) { 1023 // At least one nmethod has been marked for deoptimization. 1024 VM_Deoptimize op; 1025 VMThread::execute(&op); 1026 } 1027 } 1028 1029 // 1030 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1031 // They are the private interface between this JVM and the HotSpot-specific 1032 // Java code that implements JSR 292 method handles. 1033 // 1034 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1035 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1036 // 1037 1038 #ifndef PRODUCT 1039 #define EACH_NAMED_CON(template, requirement) \ 1040 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1041 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1042 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1043 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1044 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1045 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1046 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1047 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1048 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1049 /*end*/ 1050 1051 #define IGNORE_REQ(req_expr) /* req_expr */ 1052 #define ONE_PLUS(scope,value) 1+ 1053 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1054 #define VALUE_COMMA(scope,value) scope::value, 1055 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1056 #define STRING_NULL(scope,value) #value "\0" 1057 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1058 1059 static bool advertise_con_value(int which) { 1060 if (which < 0) return false; 1061 bool ok = true; 1062 int count = 0; 1063 #define INC_COUNT(scope,value) \ 1064 ++count; 1065 #define CHECK_REQ(req_expr) \ 1066 if (which < count) return ok; \ 1067 ok = (req_expr); 1068 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1069 #undef INC_COUNT 1070 #undef CHECK_REQ 1071 assert(count == con_value_count, ""); 1072 if (which < count) return ok; 1073 return false; 1074 } 1075 1076 #undef ONE_PLUS 1077 #undef VALUE_COMMA 1078 #undef STRING_NULL 1079 #undef EACH_NAMED_CON 1080 #endif // PRODUCT 1081 1082 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1083 #ifndef PRODUCT 1084 if (advertise_con_value(which)) { 1085 assert(which >= 0 && which < con_value_count, ""); 1086 int con = con_values[which]; 1087 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1088 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1089 const char* str = &con_names[0]; 1090 for (int i = 0; i < which; i++) 1091 str += strlen(str) + 1; // skip name and null 1092 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1093 box->obj_at_put(0, name); 1094 } 1095 return con; 1096 } 1097 #endif 1098 return 0; 1099 } 1100 JVM_END 1101 1102 // void init(MemberName self, AccessibleObject ref) 1103 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1104 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1105 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1106 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1107 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1108 MethodHandles::init_MemberName(mname, target, CHECK); 1109 } 1110 JVM_END 1111 1112 // void expand(MemberName self) 1113 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1114 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1115 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1116 MethodHandles::expand_MemberName(mname, 0, CHECK); 1117 } 1118 JVM_END 1119 1120 // void resolve(MemberName self, Class<?> caller) 1121 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1122 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1123 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1124 1125 // The trusted Java code that calls this method should already have performed 1126 // access checks on behalf of the given caller. But, we can verify this. 1127 if (VerifyMethodHandles && caller_jh != NULL && 1128 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1129 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1130 if (reference_klass != NULL && reference_klass->is_objArray_klass()) { 1131 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1132 } 1133 1134 // Reflection::verify_class_access can only handle instance classes. 1135 if (reference_klass != NULL && reference_klass->is_instance_klass()) { 1136 // Emulate LinkResolver::check_klass_accessability. 1137 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1138 if (caller != SystemDictionary::Object_klass() 1139 && Reflection::verify_class_access(caller, 1140 InstanceKlass::cast(reference_klass), 1141 true) != Reflection::ACCESS_OK) { 1142 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1143 } 1144 } 1145 } 1146 1147 Klass* caller = caller_jh == NULL ? NULL : 1148 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1149 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1150 1151 if (resolved.is_null()) { 1152 int flags = java_lang_invoke_MemberName::flags(mname()); 1153 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1154 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1155 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1156 } 1157 if ((flags & ALL_KINDS) == IS_FIELD) { 1158 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed"); 1159 } else if ((flags & ALL_KINDS) == IS_METHOD || 1160 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1161 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed"); 1162 } else { 1163 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1164 } 1165 } 1166 1167 return JNIHandles::make_local(THREAD, resolved()); 1168 } 1169 JVM_END 1170 1171 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1172 if (mname == NULL || 1173 java_lang_invoke_MemberName::clazz(mname) == NULL) { 1174 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1175 } else { 1176 int flags = java_lang_invoke_MemberName::flags(mname); 1177 if ((flags & IS_FIELD) != 0 && 1178 (must_be_static 1179 ? (flags & JVM_ACC_STATIC) != 0 1180 : (flags & JVM_ACC_STATIC) == 0)) { 1181 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1182 return (jlong) vmindex; 1183 } 1184 } 1185 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1186 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1187 return 0; 1188 } 1189 1190 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1191 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1192 } 1193 JVM_END 1194 1195 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1196 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1197 } 1198 JVM_END 1199 1200 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1201 // use the other function to perform sanity checks: 1202 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1203 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1204 return JNIHandles::make_local(THREAD, clazz); 1205 } 1206 JVM_END 1207 1208 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1209 if (mname_jh == NULL) return NULL; 1210 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1211 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1212 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1213 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1214 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1215 result->obj_at_put(0, x); 1216 1217 int flags = java_lang_invoke_MemberName::flags(mname()); 1218 if ((flags & IS_FIELD) != 0) { 1219 x = java_lang_invoke_MemberName::clazz(mname()); 1220 } else { 1221 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1222 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method"); 1223 x = mname(); 1224 } 1225 result->obj_at_put(1, x); 1226 return JNIHandles::make_local(env, result()); 1227 } 1228 JVM_END 1229 1230 1231 1232 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1233 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1234 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1235 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1236 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1237 if (clazz_jh == NULL || results_jh == NULL) return -1; 1238 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)); 1239 1240 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1241 if (results.is_null() || !results->is_objArray()) return -1; 1242 1243 TempNewSymbol name = NULL; 1244 TempNewSymbol sig = NULL; 1245 if (name_jh != NULL) { 1246 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1247 if (name == NULL) return 0; // a match is not possible 1248 } 1249 if (sig_jh != NULL) { 1250 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1251 if (sig == NULL) return 0; // a match is not possible 1252 } 1253 1254 Klass* caller = NULL; 1255 if (caller_jh != NULL) { 1256 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1257 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1258 caller = java_lang_Class::as_Klass(caller_oop); 1259 } 1260 1261 if (name != NULL && sig != NULL && results.not_null()) { 1262 // try a direct resolve 1263 // %%% TO DO 1264 } 1265 1266 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1267 caller, skip, results, CHECK_0); 1268 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1269 return res; 1270 } 1271 JVM_END 1272 1273 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1274 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1275 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1276 { 1277 // Walk all nmethods depending on this call site. 1278 MutexLocker mu(Compile_lock, thread); 1279 MethodHandles::flush_dependent_nmethods(call_site, target); 1280 java_lang_invoke_CallSite::set_target(call_site(), target()); 1281 } 1282 } 1283 JVM_END 1284 1285 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1286 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1287 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1288 { 1289 // Walk all nmethods depending on this call site. 1290 MutexLocker mu(Compile_lock, thread); 1291 MethodHandles::flush_dependent_nmethods(call_site, target); 1292 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1293 } 1294 } 1295 JVM_END 1296 1297 // It is called by a Cleaner object which ensures that dropped CallSites properly 1298 // deallocate their dependency information. 1299 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1300 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1301 { 1302 // Walk all nmethods depending on this call site. 1303 MutexLocker mu1(Compile_lock, thread); 1304 1305 int marked = 0; 1306 { 1307 NoSafepointVerifier nsv; 1308 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1309 assert(safe_to_expunge(), "removal is not safe"); 1310 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1311 marked = deps.remove_all_dependents(); 1312 } 1313 if (marked > 0) { 1314 // At least one nmethod has been marked for deoptimization 1315 VM_Deoptimize op; 1316 VMThread::execute(&op); 1317 } 1318 } 1319 } 1320 JVM_END 1321 1322 /** 1323 * Throws a java/lang/UnsupportedOperationException unconditionally. 1324 * This is required by the specification of MethodHandle.invoke if 1325 * invoked directly. 1326 */ 1327 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1328 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1329 return NULL; 1330 } 1331 JVM_END 1332 1333 /** 1334 * Throws a java/lang/UnsupportedOperationException unconditionally. 1335 * This is required by the specification of MethodHandle.invokeExact if 1336 * invoked directly. 1337 */ 1338 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1339 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1340 return NULL; 1341 } 1342 JVM_END 1343 1344 /// JVM_RegisterMethodHandleMethods 1345 1346 #undef CS // Solaris builds complain 1347 1348 #define LANG "Ljava/lang/" 1349 #define JLINV "Ljava/lang/invoke/" 1350 1351 #define OBJ LANG "Object;" 1352 #define CLS LANG "Class;" 1353 #define STRG LANG "String;" 1354 #define CS JLINV "CallSite;" 1355 #define MT JLINV "MethodType;" 1356 #define MH JLINV "MethodHandle;" 1357 #define MEM JLINV "MemberName;" 1358 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1359 1360 #define CC (char*) /*cast a literal from (const char*)*/ 1361 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1362 1363 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1364 static JNINativeMethod MHN_methods[] = { 1365 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1366 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1367 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)}, 1368 // static native int getNamedCon(int which, Object[] name) 1369 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1370 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1371 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1372 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1373 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1374 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1375 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1376 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1377 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1378 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1379 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1380 }; 1381 1382 static JNINativeMethod MH_methods[] = { 1383 // UnsupportedOperationException throwers 1384 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1385 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1386 }; 1387 1388 /** 1389 * This one function is exported, used by NativeLookup. 1390 */ 1391 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1392 assert(!MethodHandles::enabled(), "must not be enabled"); 1393 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 1394 1395 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1396 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror); 1397 1398 { 1399 ThreadToNativeFromVM ttnfv(thread); 1400 1401 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1402 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1403 "register java.lang.invoke.MethodHandleNative natives"); 1404 1405 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1406 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1407 "register java.lang.invoke.MethodHandle natives"); 1408 } 1409 1410 if (TraceInvokeDynamic) { 1411 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1412 } 1413 1414 MethodHandles::set_enabled(true); 1415 } 1416 JVM_END