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 int MethodHandles::ref_kind_to_flags(int ref_kind) { 126 assert(ref_kind_is_valid(ref_kind), "%d", ref_kind); 127 int flags = (ref_kind << REFERENCE_KIND_SHIFT); 128 if (ref_kind_is_field(ref_kind)) { 129 flags |= IS_FIELD; 130 } else if (ref_kind_is_method(ref_kind)) { 131 flags |= IS_METHOD; 132 } else if (ref_kind == JVM_REF_newInvokeSpecial) { 133 flags |= IS_CONSTRUCTOR; 134 } 135 return flags; 136 } 137 138 Handle MethodHandles::resolve_MemberName_type(Handle mname, Klass* caller, TRAPS) { 139 Handle empty; 140 Handle type(THREAD, java_lang_invoke_MemberName::type(mname())); 141 if (!java_lang_String::is_instance_inlined(type())) { 142 return type; // already resolved 143 } 144 Symbol* signature = java_lang_String::as_symbol_or_null(type()); 145 if (signature == NULL) { 146 return empty; // no such signature exists in the VM 147 } 148 Handle resolved; 149 int flags = java_lang_invoke_MemberName::flags(mname()); 150 switch (flags & ALL_KINDS) { 151 case IS_METHOD: 152 case IS_CONSTRUCTOR: 153 resolved = SystemDictionary::find_method_handle_type(signature, caller, CHECK_(empty)); 154 break; 155 case IS_FIELD: 156 resolved = SystemDictionary::find_field_handle_type(signature, caller, CHECK_(empty)); 157 break; 158 default: 159 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 160 } 161 if (resolved.is_null()) { 162 THROW_MSG_(vmSymbols::java_lang_InternalError(), "bad MemberName type", empty); 163 } 164 return resolved; 165 } 166 167 oop MethodHandles::init_MemberName(Handle mname, Handle target, TRAPS) { 168 // This method is used from java.lang.invoke.MemberName constructors. 169 // It fills in the new MemberName from a java.lang.reflect.Member. 170 Thread* thread = Thread::current(); 171 oop target_oop = target(); 172 Klass* target_klass = target_oop->klass(); 173 if (target_klass == SystemDictionary::reflect_Field_klass()) { 174 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 175 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 176 Klass* k = java_lang_Class::as_Klass(clazz); 177 if (k != NULL && k->is_instance_klass()) { 178 fieldDescriptor fd(InstanceKlass::cast(k), slot); 179 oop mname2 = init_field_MemberName(mname, fd); 180 if (mname2 != NULL) { 181 // Since we have the reified name and type handy, add them to the result. 182 if (java_lang_invoke_MemberName::name(mname2) == NULL) 183 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 184 if (java_lang_invoke_MemberName::type(mname2) == NULL) 185 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 186 } 187 return mname2; 188 } 189 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 190 oop clazz = java_lang_reflect_Method::clazz(target_oop); 191 int slot = java_lang_reflect_Method::slot(target_oop); 192 Klass* k = java_lang_Class::as_Klass(clazz); 193 if (k != NULL && k->is_instance_klass()) { 194 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 195 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 196 return NULL; // do not resolve unless there is a concrete signature 197 CallInfo info(m, k, CHECK_NULL); 198 return init_method_MemberName(mname, info); 199 } 200 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 201 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 202 int slot = java_lang_reflect_Constructor::slot(target_oop); 203 Klass* k = java_lang_Class::as_Klass(clazz); 204 if (k != NULL && k->is_instance_klass()) { 205 Method* m = InstanceKlass::cast(k)->method_with_idnum(slot); 206 if (m == NULL) return NULL; 207 CallInfo info(m, k, CHECK_NULL); 208 return init_method_MemberName(mname, info); 209 } 210 } 211 return NULL; 212 } 213 214 oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 215 assert(info.resolved_appendix().is_null(), "only normal methods here"); 216 methodHandle m = info.resolved_method(); 217 assert(m.not_null(), "null method handle"); 218 Klass* m_klass = m->method_holder(); 219 assert(m_klass != NULL, "null holder for method handle"); 220 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 221 int vmindex = Method::invalid_vtable_index; 222 223 switch (info.call_kind()) { 224 case CallInfo::itable_call: 225 vmindex = info.itable_index(); 226 // More importantly, the itable index only works with the method holder. 227 assert(m_klass->verify_itable_index(vmindex), ""); 228 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 229 if (TraceInvokeDynamic) { 230 ttyLocker ttyl; 231 ResourceMark rm; 232 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 233 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 234 vmindex); 235 m->access_flags().print_on(tty); 236 if (!m->is_abstract()) { 237 tty->print("default"); 238 } 239 tty->cr(); 240 } 241 break; 242 243 case CallInfo::vtable_call: 244 vmindex = info.vtable_index(); 245 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 246 assert(info.resolved_klass()->is_subtype_of(m_klass), "virtual call must be type-safe"); 247 if (m_klass->is_interface()) { 248 // This is a vtable call to an interface method (abstract "miranda method" or default method). 249 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 250 // (LinkResolver should help us figure this out.) 251 Klass* m_klass_non_interface = info.resolved_klass(); 252 if (m_klass_non_interface->is_interface()) { 253 m_klass_non_interface = SystemDictionary::Object_klass(); 254 #ifdef ASSERT 255 { ResourceMark rm; 256 Method* m2 = m_klass_non_interface->vtable().method_at(vmindex); 257 assert(m->name() == m2->name() && m->signature() == m2->signature(), 258 "at %d, %s != %s", vmindex, 259 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 260 } 261 #endif //ASSERT 262 } 263 if (!m->is_public()) { 264 assert(m->is_public(), "virtual call must be to public interface method"); 265 return NULL; // elicit an error later in product build 266 } 267 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface), "virtual call must be type-safe"); 268 m_klass = m_klass_non_interface; 269 } 270 if (TraceInvokeDynamic) { 271 ttyLocker ttyl; 272 ResourceMark rm; 273 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 274 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 275 m_klass->internal_name(), vmindex); 276 m->access_flags().print_on(tty); 277 if (m->is_default_method()) { 278 tty->print("default"); 279 } 280 tty->cr(); 281 } 282 break; 283 284 case CallInfo::direct_call: 285 vmindex = Method::nonvirtual_vtable_index; 286 if (m->is_static()) { 287 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 288 } else if (m->is_initializer()) { 289 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 290 } else { 291 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 292 } 293 break; 294 295 default: assert(false, "bad CallInfo"); return NULL; 296 } 297 298 // @CallerSensitive annotation detected 299 if (m->caller_sensitive()) { 300 flags |= CALLER_SENSITIVE; 301 } 302 303 Handle resolved_method = info.resolved_method_name(); 304 assert(java_lang_invoke_ResolvedMethodName::vmtarget(resolved_method()) == m(), 305 "Should not change after link resolultion"); 306 307 oop mname_oop = mname(); 308 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 309 java_lang_invoke_MemberName::set_method (mname_oop, resolved_method()); 310 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); // vtable/itable index 311 java_lang_invoke_MemberName::set_clazz (mname_oop, m_klass->java_mirror()); 312 // Note: name and type can be lazily computed by resolve_MemberName, 313 // if Java code needs them as resolved String and MethodType objects. 314 // If relevant, the vtable or itable value is stored as vmindex. 315 // This is done eagerly, since it is readily available without 316 // constructing any new objects. 317 return mname(); 318 } 319 320 oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 321 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 322 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 323 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 324 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 325 326 oop mname_oop = mname(); 327 java_lang_invoke_MemberName::set_flags (mname_oop, flags); 328 java_lang_invoke_MemberName::set_method (mname_oop, NULL); 329 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 330 java_lang_invoke_MemberName::set_clazz (mname_oop, fd.field_holder()->java_mirror()); 331 332 oop type = field_signature_type_or_null(fd.signature()); 333 oop name = field_name_or_null(fd.name()); 334 if (name != NULL) 335 java_lang_invoke_MemberName::set_name(mname_oop, name); 336 if (type != NULL) 337 java_lang_invoke_MemberName::set_type(mname_oop, type); 338 // Note: name and type can be lazily computed by resolve_MemberName, 339 // if Java code needs them as resolved String and Class objects. 340 // Note that the incoming type oop might be pre-resolved (non-null). 341 // The base clazz and field offset (vmindex) must be eagerly stored, 342 // because they unambiguously identify the field. 343 // Although the fieldDescriptor::_index would also identify the field, 344 // we do not use it, because it is harder to decode. 345 // TO DO: maybe intern mname_oop 346 return mname(); 347 } 348 349 // JVM 2.9 Special Methods: 350 // A method is signature polymorphic if and only if all of the following conditions hold : 351 // * It is declared in the java.lang.invoke.MethodHandle/VarHandle classes. 352 // * It has a single formal parameter of type Object[]. 353 // * It has a return type of Object for a polymorphic return type, otherwise a fixed return type. 354 // * It has the ACC_VARARGS and ACC_NATIVE flags set. 355 bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 356 if (klass == NULL) 357 return false; 358 // The following test will fail spuriously during bootstrap of MethodHandle itself: 359 // if (klass != SystemDictionary::MethodHandle_klass()) 360 // Test the name instead: 361 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle() && 362 klass->name() != vmSymbols::java_lang_invoke_VarHandle()) { 363 return false; 364 } 365 366 // Look up signature polymorphic method with polymorphic return type 367 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 368 InstanceKlass* iklass = InstanceKlass::cast(klass); 369 Method* m = iklass->find_method(name, poly_sig); 370 if (m != NULL) { 371 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 372 int flags = m->access_flags().as_int(); 373 if ((flags & required) == required) { 374 return true; 375 } 376 } 377 378 // Look up signature polymorphic method with non-polymorphic (non Object) return type 379 int me; 380 int ms = iklass->find_method_by_name(name, &me); 381 if (ms == -1) return false; 382 for (; ms < me; ms++) { 383 Method* m = iklass->methods()->at(ms); 384 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 385 int flags = m->access_flags().as_int(); 386 if ((flags & required) == required && ArgumentCount(m->signature()).size() == 1) { 387 return true; 388 } 389 } 390 return false; 391 } 392 393 394 Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 395 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 396 switch (iid) { 397 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 398 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 399 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 400 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 401 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 402 default: 403 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 404 return 0; 405 } 406 } 407 408 Bytecodes::Code MethodHandles::signature_polymorphic_intrinsic_bytecode(vmIntrinsics::ID id) { 409 switch(id) { 410 case vmIntrinsics::_linkToVirtual: return Bytecodes::_invokevirtual; 411 case vmIntrinsics::_linkToInterface: return Bytecodes::_invokeinterface; 412 case vmIntrinsics::_linkToStatic: return Bytecodes::_invokestatic; 413 case vmIntrinsics::_linkToSpecial: return Bytecodes::_invokespecial; 414 case vmIntrinsics::_invokeBasic: return Bytecodes::_invokehandle; 415 default: 416 fatal("unexpected id: (%d) %s", (uint)id, vmIntrinsics::name_at(id)); 417 return Bytecodes::_illegal; 418 } 419 } 420 421 int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 422 switch (iid) { 423 case vmIntrinsics::_invokeBasic: return 0; 424 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 425 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 426 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 427 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 428 default: 429 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 430 return 0; 431 } 432 } 433 434 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 435 vmSymbols::SID name_id = vmSymbols::find_sid(name); 436 switch (name_id) { 437 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 438 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 439 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 440 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 441 442 // There is one static signature-polymorphic method for each JVM invocation mode. 443 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 444 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 445 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 446 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 447 default: break; 448 } 449 450 // Cover the case of invokeExact and any future variants of invokeFoo. 451 Klass* mh_klass = SystemDictionary::well_known_klass( 452 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 453 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) { 454 return vmIntrinsics::_invokeGeneric; 455 } 456 457 // Cover the case of methods on VarHandle. 458 Klass* vh_klass = SystemDictionary::well_known_klass( 459 SystemDictionary::WK_KLASS_ENUM_NAME(VarHandle_klass) ); 460 if (vh_klass != NULL && is_method_handle_invoke_name(vh_klass, name)) { 461 return vmIntrinsics::_invokeGeneric; 462 } 463 464 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 465 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 466 return vmIntrinsics::_none; 467 } 468 469 vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 470 if (klass != NULL && 471 (klass->name() == vmSymbols::java_lang_invoke_MethodHandle() || 472 klass->name() == vmSymbols::java_lang_invoke_VarHandle())) { 473 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 474 if (iid != vmIntrinsics::_none) 475 return iid; 476 if (is_method_handle_invoke_name(klass, name)) 477 return vmIntrinsics::_invokeGeneric; 478 } 479 return vmIntrinsics::_none; 480 } 481 482 483 // convert the external string or reflective type to an internal signature 484 Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 485 if (java_lang_invoke_MethodType::is_instance(type_str)) { 486 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 487 } else if (java_lang_Class::is_instance(type_str)) { 488 return java_lang_Class::as_signature(type_str, false, THREAD); 489 } else if (java_lang_String::is_instance_inlined(type_str)) { 490 if (intern_if_not_found) { 491 return java_lang_String::as_symbol(type_str, THREAD); 492 } else { 493 return java_lang_String::as_symbol_or_null(type_str); 494 } 495 } else { 496 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 497 } 498 } 499 500 static const char OBJ_SIG[] = "Ljava/lang/Object;"; 501 enum { OBJ_SIG_LEN = 18 }; 502 503 bool MethodHandles::is_basic_type_signature(Symbol* sig) { 504 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 505 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 506 const int len = sig->utf8_length(); 507 for (int i = 0; i < len; i++) { 508 switch (sig->byte_at(i)) { 509 case 'L': 510 // only java/lang/Object is valid here 511 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 512 return false; 513 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 514 continue; 515 case '(': case ')': case 'V': 516 case 'I': case 'J': case 'F': case 'D': 517 continue; 518 //case '[': 519 //case 'Z': case 'B': case 'C': case 'S': 520 default: 521 return false; 522 } 523 } 524 return true; 525 } 526 527 Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 528 Symbol* bsig = NULL; 529 if (sig == NULL) { 530 return sig; 531 } else if (is_basic_type_signature(sig)) { 532 sig->increment_refcount(); 533 return sig; // that was easy 534 } else if (sig->byte_at(0) != '(') { 535 BasicType bt = char2type(sig->byte_at(0)); 536 if (is_subword_type(bt)) { 537 bsig = vmSymbols::int_signature(); 538 } else { 539 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 540 bsig = vmSymbols::object_signature(); 541 } 542 } else { 543 ResourceMark rm; 544 stringStream buffer(128); 545 buffer.put('('); 546 int arg_pos = 0, keep_arg_pos = -1; 547 if (keep_last_arg) 548 keep_arg_pos = ArgumentCount(sig).size() - 1; 549 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 550 BasicType bt = ss.type(); 551 size_t this_arg_pos = buffer.size(); 552 if (ss.at_return_type()) { 553 buffer.put(')'); 554 } 555 if (arg_pos == keep_arg_pos) { 556 buffer.write((char*) ss.raw_bytes(), 557 (int) ss.raw_length()); 558 } else if (bt == T_OBJECT || bt == T_ARRAY) { 559 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 560 } else { 561 if (is_subword_type(bt)) 562 bt = T_INT; 563 buffer.put(type2char(bt)); 564 } 565 arg_pos++; 566 } 567 const char* sigstr = buffer.base(); 568 int siglen = (int) buffer.size(); 569 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 570 } 571 assert(is_basic_type_signature(bsig) || 572 // detune assert in case the injected argument is not a basic type: 573 keep_last_arg, ""); 574 return bsig; 575 } 576 577 void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 578 Symbol* sig, 579 bool keep_arrays, 580 bool keep_basic_names) { 581 st = st ? st : tty; 582 int len = sig->utf8_length(); 583 int array = 0; 584 bool prev_type = false; 585 for (int i = 0; i < len; i++) { 586 char ch = sig->byte_at(i); 587 switch (ch) { 588 case '(': case ')': 589 prev_type = false; 590 st->put(ch); 591 continue; 592 case '[': 593 if (!keep_basic_names && keep_arrays) 594 st->put(ch); 595 array++; 596 continue; 597 case 'L': 598 { 599 if (prev_type) st->put(','); 600 int start = i+1, slash = start; 601 while (++i < len && (ch = sig->byte_at(i)) != ';') { 602 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 603 } 604 if (slash < i) start = slash; 605 if (!keep_basic_names) { 606 st->put('L'); 607 } else { 608 for (int j = start; j < i; j++) 609 st->put(sig->byte_at(j)); 610 prev_type = true; 611 } 612 break; 613 } 614 default: 615 { 616 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 617 ch = '['; 618 array = 0; 619 } 620 if (prev_type) st->put(','); 621 const char* n = NULL; 622 if (keep_basic_names) 623 n = type2name(char2type(ch)); 624 if (n == NULL) { 625 // unknown letter, or we don't want to know its name 626 st->put(ch); 627 } else { 628 st->print("%s", n); 629 prev_type = true; 630 } 631 break; 632 } 633 } 634 // Switch break goes here to take care of array suffix: 635 if (prev_type) { 636 while (array > 0) { 637 st->print("[]"); 638 --array; 639 } 640 } 641 array = 0; 642 } 643 } 644 645 646 647 static oop object_java_mirror() { 648 return SystemDictionary::Object_klass()->java_mirror(); 649 } 650 651 oop MethodHandles::field_name_or_null(Symbol* s) { 652 if (s == NULL) return NULL; 653 return StringTable::lookup(s); 654 } 655 656 oop MethodHandles::field_signature_type_or_null(Symbol* s) { 657 if (s == NULL) return NULL; 658 BasicType bt = FieldType::basic_type(s); 659 if (is_java_primitive(bt)) { 660 assert(s->utf8_length() == 1, ""); 661 return java_lang_Class::primitive_mirror(bt); 662 } 663 // Here are some more short cuts for common types. 664 // They are optional, since reference types can be resolved lazily. 665 if (bt == T_OBJECT) { 666 if (s == vmSymbols::object_signature()) { 667 return object_java_mirror(); 668 } else if (s == vmSymbols::class_signature()) { 669 return SystemDictionary::Class_klass()->java_mirror(); 670 } else if (s == vmSymbols::string_signature()) { 671 return SystemDictionary::String_klass()->java_mirror(); 672 } 673 } 674 return NULL; 675 } 676 677 678 // An unresolved member name is a mere symbolic reference. 679 // Resolving it plants a vmtarget/vmindex in it, 680 // which refers directly to JVM internals. 681 Handle MethodHandles::resolve_MemberName(Handle mname, Klass* caller, TRAPS) { 682 Handle empty; 683 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 684 685 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 686 // Already resolved. 687 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 688 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 689 return mname; 690 } 691 692 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 693 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 694 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 695 int flags = java_lang_invoke_MemberName::flags(mname()); 696 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 697 if (!ref_kind_is_valid(ref_kind)) { 698 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 699 } 700 701 DEBUG_ONLY(int old_vmindex); 702 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 703 704 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 705 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 706 } 707 708 InstanceKlass* defc = NULL; 709 { 710 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 711 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 712 if (!defc_klass->is_instance_klass()) { 713 if (!defc_klass->is_array_klass()) return empty; 714 defc_klass = SystemDictionary::Object_klass(); 715 } 716 defc = InstanceKlass::cast(defc_klass); 717 } 718 if (defc == NULL) { 719 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 720 } 721 defc->link_class(CHECK_(empty)); // possible safepoint 722 723 // convert the external string name to an internal symbol 724 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 725 if (name == NULL) return empty; // no such name 726 if (name == vmSymbols::class_initializer_name()) 727 return empty; // illegal name 728 729 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 730 if ((flags & ALL_KINDS) == IS_METHOD && 731 (defc == SystemDictionary::MethodHandle_klass()) && 732 (ref_kind == JVM_REF_invokeVirtual || 733 ref_kind == JVM_REF_invokeSpecial || 734 // static invocation mode is required for _linkToVirtual, etc.: 735 ref_kind == JVM_REF_invokeStatic)) { 736 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 737 if (iid != vmIntrinsics::_none && 738 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 739 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 740 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 741 mh_invoke_id = iid; 742 } 743 } 744 745 // convert the external string or reflective type to an internal signature 746 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 747 if (type == NULL) return empty; // no such signature exists in the VM 748 749 LinkInfo::AccessCheck access_check = caller != NULL ? 750 LinkInfo::needs_access_check : 751 LinkInfo::skip_access_check; 752 753 // Time to do the lookup. 754 switch (flags & ALL_KINDS) { 755 case IS_METHOD: 756 { 757 CallInfo result; 758 LinkInfo link_info(defc, name, type, caller, access_check); 759 { 760 assert(!HAS_PENDING_EXCEPTION, ""); 761 if (ref_kind == JVM_REF_invokeStatic) { 762 LinkResolver::resolve_static_call(result, 763 link_info, false, THREAD); 764 } else if (ref_kind == JVM_REF_invokeInterface) { 765 LinkResolver::resolve_interface_call(result, Handle(), defc, 766 link_info, false, THREAD); 767 } else if (mh_invoke_id != vmIntrinsics::_none) { 768 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 769 LinkResolver::resolve_handle_call(result, link_info, THREAD); 770 } else if (ref_kind == JVM_REF_invokeSpecial) { 771 LinkResolver::resolve_special_call(result, Handle(), 772 link_info, THREAD); 773 } else if (ref_kind == JVM_REF_invokeVirtual) { 774 LinkResolver::resolve_virtual_call(result, Handle(), defc, 775 link_info, false, THREAD); 776 } else { 777 assert(false, "ref_kind=%d", ref_kind); 778 } 779 if (HAS_PENDING_EXCEPTION) { 780 return empty; 781 } 782 } 783 if (result.resolved_appendix().not_null()) { 784 // The resolved MemberName must not be accompanied by an appendix argument, 785 // since there is no way to bind this value into the MemberName. 786 // Caller is responsible to prevent this from happening. 787 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 788 } 789 result.set_resolved_method_name(CHECK_(empty)); 790 oop mname2 = init_method_MemberName(mname, result); 791 return Handle(THREAD, mname2); 792 } 793 case IS_CONSTRUCTOR: 794 { 795 CallInfo result; 796 LinkInfo link_info(defc, name, type, caller, access_check); 797 { 798 assert(!HAS_PENDING_EXCEPTION, ""); 799 if (name == vmSymbols::object_initializer_name()) { 800 LinkResolver::resolve_special_call(result, Handle(), link_info, THREAD); 801 } else { 802 break; // will throw after end of switch 803 } 804 if (HAS_PENDING_EXCEPTION) { 805 return empty; 806 } 807 } 808 assert(result.is_statically_bound(), ""); 809 result.set_resolved_method_name(CHECK_(empty)); 810 oop mname2 = init_method_MemberName(mname, result); 811 return Handle(THREAD, mname2); 812 } 813 case IS_FIELD: 814 { 815 fieldDescriptor result; // find_field initializes fd if found 816 { 817 assert(!HAS_PENDING_EXCEPTION, ""); 818 LinkInfo link_info(defc, name, type, caller, LinkInfo::skip_access_check); 819 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 820 if (HAS_PENDING_EXCEPTION) { 821 return empty; 822 } 823 } 824 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 825 return Handle(THREAD, mname2); 826 } 827 default: 828 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 829 } 830 831 return empty; 832 } 833 834 // Conversely, a member name which is only initialized from JVM internals 835 // may have null defc, name, and type fields. 836 // Resolving it plants a vmtarget/vmindex in it, 837 // which refers directly to JVM internals. 838 void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 839 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 840 841 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 842 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 843 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 844 int flags = java_lang_invoke_MemberName::flags(mname()); 845 846 if (suppress != 0) { 847 if (suppress & _suppress_defc) have_defc = true; 848 if (suppress & _suppress_name) have_name = true; 849 if (suppress & _suppress_type) have_type = true; 850 } 851 852 if (have_defc && have_name && have_type) return; // nothing needed 853 854 switch (flags & ALL_KINDS) { 855 case IS_METHOD: 856 case IS_CONSTRUCTOR: 857 { 858 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 859 if (vmtarget == NULL) { 860 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 861 } 862 methodHandle m(THREAD, vmtarget); 863 DEBUG_ONLY(vmtarget = NULL); // safety 864 if (!have_defc) { 865 InstanceKlass* defc = m->method_holder(); 866 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 867 } 868 if (!have_name) { 869 //not java_lang_String::create_from_symbol; let's intern member names 870 oop name = StringTable::intern(m->name(), CHECK); 871 java_lang_invoke_MemberName::set_name(mname(), name); 872 } 873 if (!have_type) { 874 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 875 java_lang_invoke_MemberName::set_type(mname(), type()); 876 } 877 return; 878 } 879 case IS_FIELD: 880 { 881 oop clazz = java_lang_invoke_MemberName::clazz(mname()); 882 if (clazz == NULL) { 883 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand (as field)"); 884 } 885 InstanceKlass* defc = InstanceKlass::cast(java_lang_Class::as_Klass(clazz)); 886 DEBUG_ONLY(clazz = NULL); // safety 887 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 888 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 889 fieldDescriptor fd; // find_field initializes fd if found 890 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 891 break; // cannot expand 892 if (!have_name) { 893 //not java_lang_String::create_from_symbol; let's intern member names 894 oop name = StringTable::intern(fd.name(), CHECK); 895 java_lang_invoke_MemberName::set_name(mname(), name); 896 } 897 if (!have_type) { 898 // If it is a primitive field type, don't mess with short strings like "I". 899 Handle type (THREAD, field_signature_type_or_null(fd.signature())); 900 if (type.is_null()) { 901 type = java_lang_String::create_from_symbol(fd.signature(), CHECK); 902 } 903 java_lang_invoke_MemberName::set_type(mname(), type()); 904 } 905 return; 906 } 907 } 908 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 909 } 910 911 int MethodHandles::find_MemberNames(Klass* k, 912 Symbol* name, Symbol* sig, 913 int mflags, Klass* caller, 914 int skip, objArrayHandle results, TRAPS) { 915 // %%% take caller into account! 916 917 Thread* thread = Thread::current(); 918 919 if (k == NULL || !k->is_instance_klass()) return -1; 920 921 int rfill = 0, rlimit = results->length(), rskip = skip; 922 // overflow measurement: 923 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 924 925 int match_flags = mflags; 926 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 927 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 928 bool local_only = !(search_superc | search_intfc); 929 bool classes_only = false; 930 931 if (name != NULL) { 932 if (name->utf8_length() == 0) return 0; // a match is not possible 933 } 934 if (sig != NULL) { 935 if (sig->utf8_length() == 0) return 0; // a match is not possible 936 if (sig->byte_at(0) == '(') 937 match_flags &= ~(IS_FIELD | IS_TYPE); 938 else 939 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 940 } 941 942 if ((match_flags & IS_TYPE) != 0) { 943 // NYI, and Core Reflection works quite well for this query 944 } 945 946 if ((match_flags & IS_FIELD) != 0) { 947 InstanceKlass* ik = InstanceKlass::cast(k); 948 for (FieldStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 949 if (name != NULL && st.name() != name) 950 continue; 951 if (sig != NULL && st.signature() != sig) 952 continue; 953 // passed the filters 954 if (rskip > 0) { 955 --rskip; 956 } else if (rfill < rlimit) { 957 Handle result(thread, results->obj_at(rfill++)); 958 if (!java_lang_invoke_MemberName::is_instance(result())) 959 return -99; // caller bug! 960 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 961 if (saved != result()) 962 results->obj_at_put(rfill-1, saved); // show saved instance to user 963 } else if (++overflow >= overflow_limit) { 964 match_flags = 0; break; // got tired of looking at overflow 965 } 966 } 967 } 968 969 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 970 // watch out for these guys: 971 Symbol* init_name = vmSymbols::object_initializer_name(); 972 Symbol* clinit_name = vmSymbols::class_initializer_name(); 973 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 974 bool negate_name_test = false; 975 // fix name so that it captures the intention of IS_CONSTRUCTOR 976 if (!(match_flags & IS_METHOD)) { 977 // constructors only 978 if (name == NULL) { 979 name = init_name; 980 } else if (name != init_name) { 981 return 0; // no constructors of this method name 982 } 983 } else if (!(match_flags & IS_CONSTRUCTOR)) { 984 // methods only 985 if (name == NULL) { 986 name = init_name; 987 negate_name_test = true; // if we see the name, we *omit* the entry 988 } else if (name == init_name) { 989 return 0; // no methods of this constructor name 990 } 991 } else { 992 // caller will accept either sort; no need to adjust name 993 } 994 InstanceKlass* ik = InstanceKlass::cast(k); 995 for (MethodStream st(ik, local_only, !search_intfc); !st.eos(); st.next()) { 996 Method* m = st.method(); 997 Symbol* m_name = m->name(); 998 if (m_name == clinit_name) 999 continue; 1000 if (name != NULL && ((m_name != name) ^ negate_name_test)) 1001 continue; 1002 if (sig != NULL && m->signature() != sig) 1003 continue; 1004 // passed the filters 1005 if (rskip > 0) { 1006 --rskip; 1007 } else if (rfill < rlimit) { 1008 Handle result(thread, results->obj_at(rfill++)); 1009 if (!java_lang_invoke_MemberName::is_instance(result())) 1010 return -99; // caller bug! 1011 CallInfo info(m, NULL, CHECK_0); 1012 oop saved = MethodHandles::init_method_MemberName(result, info); 1013 if (saved != result()) 1014 results->obj_at_put(rfill-1, saved); // show saved instance to user 1015 } else if (++overflow >= overflow_limit) { 1016 match_flags = 0; break; // got tired of looking at overflow 1017 } 1018 } 1019 } 1020 1021 // return number of elements we at leasted wanted to initialize 1022 return rfill + overflow; 1023 } 1024 1025 // Is it safe to remove stale entries from a dependency list? 1026 static bool safe_to_expunge() { 1027 // Since parallel GC threads can concurrently iterate over a dependency 1028 // list during safepoint, it is safe to remove entries only when 1029 // CodeCache lock is held. 1030 return CodeCache_lock->owned_by_self(); 1031 } 1032 1033 void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 1034 assert_locked_or_safepoint(CodeCache_lock); 1035 1036 oop context = java_lang_invoke_CallSite::context(call_site); 1037 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1038 // Try to purge stale entries on updates. 1039 // Since GC doesn't clean dependency contexts rooted at CallSiteContext objects, 1040 // in order to avoid memory leak, stale entries are purged whenever a dependency list 1041 // is changed (both on addition and removal). Though memory reclamation is delayed, 1042 // it avoids indefinite memory usage growth. 1043 deps.add_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 1044 } 1045 1046 void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 1047 assert_locked_or_safepoint(CodeCache_lock); 1048 1049 oop context = java_lang_invoke_CallSite::context(call_site); 1050 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1051 deps.remove_dependent_nmethod(nm, /*expunge_stale_entries=*/safe_to_expunge()); 1052 } 1053 1054 void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 1055 assert_lock_strong(Compile_lock); 1056 1057 int marked = 0; 1058 CallSiteDepChange changes(call_site, target); 1059 { 1060 NoSafepointVerifier nsv; 1061 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1062 1063 oop context = java_lang_invoke_CallSite::context(call_site()); 1064 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 1065 marked = deps.mark_dependent_nmethods(changes); 1066 } 1067 if (marked > 0) { 1068 // At least one nmethod has been marked for deoptimization. 1069 VM_Deoptimize op; 1070 VMThread::execute(&op); 1071 } 1072 } 1073 1074 void MethodHandles::trace_method_handle_interpreter_entry(MacroAssembler* _masm, vmIntrinsics::ID iid) { 1075 if (TraceMethodHandles) { 1076 const char* name = vmIntrinsics::name_at(iid); 1077 if (*name == '_') name += 1; 1078 const size_t len = strlen(name) + 50; 1079 char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal); 1080 const char* suffix = ""; 1081 if (is_signature_polymorphic(iid)) { 1082 if (is_signature_polymorphic_static(iid)) 1083 suffix = "/static"; 1084 else 1085 suffix = "/private"; 1086 } 1087 jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix); 1088 trace_method_handle(_masm, qname); 1089 // Note: Don't free the allocated char array because it's used 1090 // during runtime. 1091 } 1092 } 1093 1094 // 1095 // Here are the native methods in java.lang.invoke.MethodHandleNatives 1096 // They are the private interface between this JVM and the HotSpot-specific 1097 // Java code that implements JSR 292 method handles. 1098 // 1099 // Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1100 // that intrinsic (non-JNI) native methods are defined in HotSpot. 1101 // 1102 1103 #ifndef PRODUCT 1104 #define EACH_NAMED_CON(template, requirement) \ 1105 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1106 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1107 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1108 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1109 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1110 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1111 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1112 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1113 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1114 /*end*/ 1115 1116 #define IGNORE_REQ(req_expr) /* req_expr */ 1117 #define ONE_PLUS(scope,value) 1+ 1118 static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1119 #define VALUE_COMMA(scope,value) scope::value, 1120 static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1121 #define STRING_NULL(scope,value) #value "\0" 1122 static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1123 1124 static bool advertise_con_value(int which) { 1125 if (which < 0) return false; 1126 bool ok = true; 1127 int count = 0; 1128 #define INC_COUNT(scope,value) \ 1129 ++count; 1130 #define CHECK_REQ(req_expr) \ 1131 if (which < count) return ok; \ 1132 ok = (req_expr); 1133 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1134 #undef INC_COUNT 1135 #undef CHECK_REQ 1136 assert(count == con_value_count, ""); 1137 if (which < count) return ok; 1138 return false; 1139 } 1140 1141 #undef ONE_PLUS 1142 #undef VALUE_COMMA 1143 #undef STRING_NULL 1144 #undef EACH_NAMED_CON 1145 #endif // PRODUCT 1146 1147 JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1148 #ifndef PRODUCT 1149 if (advertise_con_value(which)) { 1150 assert(which >= 0 && which < con_value_count, ""); 1151 int con = con_values[which]; 1152 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1153 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1154 const char* str = &con_names[0]; 1155 for (int i = 0; i < which; i++) 1156 str += strlen(str) + 1; // skip name and null 1157 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1158 box->obj_at_put(0, name); 1159 } 1160 return con; 1161 } 1162 #endif 1163 return 0; 1164 } 1165 JVM_END 1166 1167 // void init(MemberName self, AccessibleObject ref) 1168 JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1169 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1170 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1171 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1172 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1173 MethodHandles::init_MemberName(mname, target, CHECK); 1174 } 1175 JVM_END 1176 1177 // void expand(MemberName self) 1178 JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1179 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1180 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1181 MethodHandles::expand_MemberName(mname, 0, CHECK); 1182 } 1183 JVM_END 1184 1185 // void resolve(MemberName self, Class<?> caller) 1186 JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1187 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1188 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1189 1190 // The trusted Java code that calls this method should already have performed 1191 // access checks on behalf of the given caller. But, we can verify this. 1192 if (VerifyMethodHandles && caller_jh != NULL && 1193 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1194 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1195 if (reference_klass != NULL && reference_klass->is_objArray_klass()) { 1196 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1197 } 1198 1199 // Reflection::verify_class_access can only handle instance classes. 1200 if (reference_klass != NULL && reference_klass->is_instance_klass()) { 1201 // Emulate LinkResolver::check_klass_accessability. 1202 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1203 if (caller != SystemDictionary::Object_klass() 1204 && Reflection::verify_class_access(caller, 1205 InstanceKlass::cast(reference_klass), 1206 true) != Reflection::ACCESS_OK) { 1207 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1208 } 1209 } 1210 } 1211 1212 Klass* caller = caller_jh == NULL ? NULL : 1213 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1214 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1215 1216 if (resolved.is_null()) { 1217 int flags = java_lang_invoke_MemberName::flags(mname()); 1218 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1219 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1220 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1221 } 1222 if ((flags & ALL_KINDS) == IS_FIELD) { 1223 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "field resolution failed"); 1224 } else if ((flags & ALL_KINDS) == IS_METHOD || 1225 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1226 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "method resolution failed"); 1227 } else { 1228 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1229 } 1230 } 1231 1232 return JNIHandles::make_local(THREAD, resolved()); 1233 } 1234 JVM_END 1235 1236 static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1237 if (mname == NULL || 1238 java_lang_invoke_MemberName::clazz(mname) == NULL) { 1239 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1240 } else { 1241 int flags = java_lang_invoke_MemberName::flags(mname); 1242 if ((flags & IS_FIELD) != 0 && 1243 (must_be_static 1244 ? (flags & JVM_ACC_STATIC) != 0 1245 : (flags & JVM_ACC_STATIC) == 0)) { 1246 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1247 return (jlong) vmindex; 1248 } 1249 } 1250 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1251 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1252 return 0; 1253 } 1254 1255 JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1256 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1257 } 1258 JVM_END 1259 1260 JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1261 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1262 } 1263 JVM_END 1264 1265 JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1266 // use the other function to perform sanity checks: 1267 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1268 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1269 return JNIHandles::make_local(THREAD, clazz); 1270 } 1271 JVM_END 1272 1273 JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1274 if (mname_jh == NULL) return NULL; 1275 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1276 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1277 objArrayHandle result = oopFactory::new_objArray_handle(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1278 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1279 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1280 result->obj_at_put(0, x); 1281 1282 int flags = java_lang_invoke_MemberName::flags(mname()); 1283 if ((flags & IS_FIELD) != 0) { 1284 x = java_lang_invoke_MemberName::clazz(mname()); 1285 } else { 1286 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1287 assert(vmtarget != NULL && vmtarget->is_method(), "vmtarget is only method"); 1288 x = mname(); 1289 } 1290 result->obj_at_put(1, x); 1291 return JNIHandles::make_local(env, result()); 1292 } 1293 JVM_END 1294 1295 1296 1297 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1298 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1299 JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1300 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1301 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1302 if (clazz_jh == NULL || results_jh == NULL) return -1; 1303 Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh)); 1304 1305 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1306 if (results.is_null() || !results->is_objArray()) return -1; 1307 1308 TempNewSymbol name = NULL; 1309 TempNewSymbol sig = NULL; 1310 if (name_jh != NULL) { 1311 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1312 if (name == NULL) return 0; // a match is not possible 1313 } 1314 if (sig_jh != NULL) { 1315 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1316 if (sig == NULL) return 0; // a match is not possible 1317 } 1318 1319 Klass* caller = NULL; 1320 if (caller_jh != NULL) { 1321 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1322 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1323 caller = java_lang_Class::as_Klass(caller_oop); 1324 } 1325 1326 if (name != NULL && sig != NULL && results.not_null()) { 1327 // try a direct resolve 1328 // %%% TO DO 1329 } 1330 1331 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1332 caller, skip, results, CHECK_0); 1333 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1334 return res; 1335 } 1336 JVM_END 1337 1338 JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1339 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1340 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1341 { 1342 // Walk all nmethods depending on this call site. 1343 MutexLocker mu(Compile_lock, thread); 1344 MethodHandles::flush_dependent_nmethods(call_site, target); 1345 java_lang_invoke_CallSite::set_target(call_site(), target()); 1346 } 1347 } 1348 JVM_END 1349 1350 JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1351 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1352 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1353 { 1354 // Walk all nmethods depending on this call site. 1355 MutexLocker mu(Compile_lock, thread); 1356 MethodHandles::flush_dependent_nmethods(call_site, target); 1357 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1358 } 1359 } 1360 JVM_END 1361 1362 // It is called by a Cleaner object which ensures that dropped CallSites properly 1363 // deallocate their dependency information. 1364 JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1365 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1366 { 1367 // Walk all nmethods depending on this call site. 1368 MutexLocker mu1(Compile_lock, thread); 1369 1370 int marked = 0; 1371 { 1372 NoSafepointVerifier nsv; 1373 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1374 assert(safe_to_expunge(), "removal is not safe"); 1375 DependencyContext deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1376 marked = deps.remove_all_dependents(); 1377 } 1378 if (marked > 0) { 1379 // At least one nmethod has been marked for deoptimization 1380 VM_Deoptimize op; 1381 VMThread::execute(&op); 1382 } 1383 } 1384 } 1385 JVM_END 1386 1387 /** 1388 * Throws a java/lang/UnsupportedOperationException unconditionally. 1389 * This is required by the specification of MethodHandle.invoke if 1390 * invoked directly. 1391 */ 1392 JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1393 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1394 return NULL; 1395 } 1396 JVM_END 1397 1398 /** 1399 * Throws a java/lang/UnsupportedOperationException unconditionally. 1400 * This is required by the specification of MethodHandle.invokeExact if 1401 * invoked directly. 1402 */ 1403 JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1404 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1405 return NULL; 1406 } 1407 JVM_END 1408 1409 /// JVM_RegisterMethodHandleMethods 1410 1411 #undef CS // Solaris builds complain 1412 1413 #define LANG "Ljava/lang/" 1414 #define JLINV "Ljava/lang/invoke/" 1415 1416 #define OBJ LANG "Object;" 1417 #define CLS LANG "Class;" 1418 #define STRG LANG "String;" 1419 #define CS JLINV "CallSite;" 1420 #define MT JLINV "MethodType;" 1421 #define MH JLINV "MethodHandle;" 1422 #define MEM JLINV "MemberName;" 1423 #define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1424 1425 #define CC (char*) /*cast a literal from (const char*)*/ 1426 #define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1427 1428 // These are the native methods on java.lang.invoke.MethodHandleNatives. 1429 static JNINativeMethod MHN_methods[] = { 1430 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1431 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1432 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)}, 1433 // static native int getNamedCon(int which, Object[] name) 1434 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1435 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1436 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1437 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1438 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1439 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1440 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1441 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1442 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1443 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1444 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1445 }; 1446 1447 static JNINativeMethod MH_methods[] = { 1448 // UnsupportedOperationException throwers 1449 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1450 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1451 }; 1452 1453 /** 1454 * This one function is exported, used by NativeLookup. 1455 */ 1456 JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1457 assert(!MethodHandles::enabled(), "must not be enabled"); 1458 assert(SystemDictionary::MethodHandle_klass() != NULL, "should be present"); 1459 1460 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1461 jclass MH_class = (jclass) JNIHandles::make_local(env, mirror); 1462 1463 { 1464 ThreadToNativeFromVM ttnfv(thread); 1465 1466 int status = env->RegisterNatives(MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1467 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1468 "register java.lang.invoke.MethodHandleNative natives"); 1469 1470 status = env->RegisterNatives(MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1471 guarantee(status == JNI_OK && !env->ExceptionOccurred(), 1472 "register java.lang.invoke.MethodHandle natives"); 1473 } 1474 1475 if (TraceInvokeDynamic) { 1476 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1477 } 1478 1479 MethodHandles::set_enabled(true); 1480 } 1481 JVM_END