methodHandles.cpp revision 9149:a8a8604f890f
1/* 2 * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/javaClasses.inline.hpp" 27#include "classfile/stringTable.hpp" 28#include "code/codeCache.hpp" 29#include "code/codeCacheExtensions.hpp" 30#include "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 "oops/objArrayOop.inline.hpp" 37#include "oops/oop.inline.hpp" 38#include "prims/methodHandles.hpp" 39#include "prims/jvmtiRedefineClassesTrace.hpp" 40#include "runtime/compilationPolicy.hpp" 41#include "runtime/javaCalls.hpp" 42#include "runtime/reflection.hpp" 43#include "runtime/signature.hpp" 44#include "runtime/stubRoutines.hpp" 45#include "utilities/exceptions.hpp" 46 47 48/* 49 * JSR 292 reference implementation: method handles 50 * The JDK 7 reference implementation represented method handle 51 * combinations as chains. Each link in the chain had a "vmentry" 52 * field which pointed at a bit of assembly code which performed 53 * one transformation before dispatching to the next link in the chain. 54 * 55 * The current reference implementation pushes almost all code generation 56 * responsibility to (trusted) Java code. A method handle contains a 57 * pointer to its "LambdaForm", which embodies all details of the method 58 * handle's behavior. The LambdaForm is a normal Java object, managed 59 * by a runtime coded in Java. 60 */ 61 62bool MethodHandles::_enabled = false; // set true after successful native linkage 63MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 64 65 66/** 67 * Generates method handle adapters. Returns 'false' if memory allocation 68 * failed and true otherwise. 69 */ 70bool MethodHandles::generate_adapters() { 71 if (SystemDictionary::MethodHandle_klass() == NULL) { 72 return true; 73 } 74 75 assert(_adapter_code == NULL, "generate only once"); 76 77 ResourceMark rm; 78 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); 79 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 80 if (_adapter_code == NULL) { 81 return false; 82 } 83 84 CodeBuffer code(_adapter_code); 85 MethodHandlesAdapterGenerator g(&code); 86 g.generate(); 87 code.log_section_sizes("MethodHandlesAdapterBlob"); 88 return true; 89} 90 91//------------------------------------------------------------------------------ 92// MethodHandlesAdapterGenerator::generate 93// 94void MethodHandlesAdapterGenerator::generate() { 95 // Generate generic method handle adapters. 96 // Generate interpreter entries 97 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 98 mk <= Interpreter::method_handle_invoke_LAST; 99 mk = Interpreter::MethodKind(1 + (int)mk)) { 100 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 101 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 102 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 103 if (entry != NULL) { 104 CodeCacheExtensions::handle_generated_pc(entry, vmIntrinsics::name_at(iid)); 105 Interpreter::set_entry_for_kind(mk, entry); 106 } 107 // If the entry is not set, it will throw AbstractMethodError. 108 } 109} 110 111void MethodHandles::set_enabled(bool z) { 112 if (_enabled != z) { 113 guarantee(z, "can only enable once"); 114 _enabled = z; 115 } 116} 117 118// MemberName support 119 120// import java_lang_invoke_MemberName.* 121enum { 122 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 123 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 124 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 125 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 126 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 127 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 128 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 129 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 130 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 131 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 132}; 133 134Handle MethodHandles::new_MemberName(TRAPS) { 135 Handle empty; 136 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 137 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 138 return Handle(THREAD, k->allocate_instance(THREAD)); 139} 140 141oop MethodHandles::init_MemberName(Handle mname, Handle target) { 142 // This method is used from java.lang.invoke.MemberName constructors. 143 // It fills in the new MemberName from a java.lang.reflect.Member. 144 Thread* thread = Thread::current(); 145 oop target_oop = target(); 146 Klass* target_klass = target_oop->klass(); 147 if (target_klass == SystemDictionary::reflect_Field_klass()) { 148 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 149 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 150 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 151 if (!k.is_null() && k->oop_is_instance()) { 152 fieldDescriptor fd(InstanceKlass::cast(k()), slot); 153 oop mname2 = init_field_MemberName(mname, fd); 154 if (mname2 != NULL) { 155 // Since we have the reified name and type handy, add them to the result. 156 if (java_lang_invoke_MemberName::name(mname2) == NULL) 157 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 158 if (java_lang_invoke_MemberName::type(mname2) == NULL) 159 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 160 } 161 return mname2; 162 } 163 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 164 oop clazz = java_lang_reflect_Method::clazz(target_oop); 165 int slot = java_lang_reflect_Method::slot(target_oop); 166 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 167 if (!k.is_null() && k->oop_is_instance()) { 168 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 169 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 170 return NULL; // do not resolve unless there is a concrete signature 171 CallInfo info(m, k()); 172 return init_method_MemberName(mname, info); 173 } 174 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 175 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 176 int slot = java_lang_reflect_Constructor::slot(target_oop); 177 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 178 if (!k.is_null() && k->oop_is_instance()) { 179 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 180 if (m == NULL) return NULL; 181 CallInfo info(m, k()); 182 return init_method_MemberName(mname, info); 183 } 184 } 185 return NULL; 186} 187 188oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 189 assert(info.resolved_appendix().is_null(), "only normal methods here"); 190 methodHandle m = info.resolved_method(); 191 assert(m.not_null(), "null method handle"); 192 KlassHandle m_klass = m->method_holder(); 193 assert(m.not_null(), "null holder for method handle"); 194 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 195 int vmindex = Method::invalid_vtable_index; 196 197 switch (info.call_kind()) { 198 case CallInfo::itable_call: 199 vmindex = info.itable_index(); 200 // More importantly, the itable index only works with the method holder. 201 assert(m_klass->verify_itable_index(vmindex), ""); 202 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 203 if (TraceInvokeDynamic) { 204 ResourceMark rm; 205 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 206 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 207 vmindex); 208 m->access_flags().print_on(tty); 209 if (!m->is_abstract()) { 210 tty->print("default"); 211 } 212 tty->cr(); 213 } 214 break; 215 216 case CallInfo::vtable_call: 217 vmindex = info.vtable_index(); 218 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 219 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe"); 220 if (m_klass->is_interface()) { 221 // This is a vtable call to an interface method (abstract "miranda method" or default method). 222 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 223 // (LinkResolver should help us figure this out.) 224 KlassHandle m_klass_non_interface = info.resolved_klass(); 225 if (m_klass_non_interface->is_interface()) { 226 m_klass_non_interface = SystemDictionary::Object_klass(); 227#ifdef ASSERT 228 { ResourceMark rm; 229 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex); 230 assert(m->name() == m2->name() && m->signature() == m2->signature(), 231 "at %d, %s != %s", vmindex, 232 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string()); 233 } 234#endif //ASSERT 235 } 236 if (!m->is_public()) { 237 assert(m->is_public(), "virtual call must be to public interface method"); 238 return NULL; // elicit an error later in product build 239 } 240 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe"); 241 m_klass = m_klass_non_interface; 242 } 243 if (TraceInvokeDynamic) { 244 ResourceMark rm; 245 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 246 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 247 m_klass->internal_name(), vmindex); 248 m->access_flags().print_on(tty); 249 if (m->is_default_method()) { 250 tty->print("default"); 251 } 252 tty->cr(); 253 } 254 break; 255 256 case CallInfo::direct_call: 257 vmindex = Method::nonvirtual_vtable_index; 258 if (m->is_static()) { 259 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 260 } else if (m->is_initializer()) { 261 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 262 } else { 263 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 264 } 265 break; 266 267 default: assert(false, "bad CallInfo"); return NULL; 268 } 269 270 // @CallerSensitive annotation detected 271 if (m->caller_sensitive()) { 272 flags |= CALLER_SENSITIVE; 273 } 274 275 oop mname_oop = mname(); 276 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 277 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); 278 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 279 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror()); 280 // Note: name and type can be lazily computed by resolve_MemberName, 281 // if Java code needs them as resolved String and MethodType objects. 282 // The clazz must be eagerly stored, because it provides a GC 283 // root to help keep alive the Method*. 284 // If relevant, the vtable or itable value is stored as vmindex. 285 // This is done eagerly, since it is readily available without 286 // constructing any new objects. 287 // TO DO: maybe intern mname_oop 288 if (m->method_holder()->add_member_name(mname)) { 289 return mname(); 290 } else { 291 // Redefinition caused this to fail. Return NULL (and an exception?) 292 return NULL; 293 } 294} 295 296oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 297 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 298 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 299 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 300 Metadata* vmtarget = fd.field_holder(); 301 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 302 oop mname_oop = mname(); 303 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 304 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 305 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 306 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); 307 oop type = field_signature_type_or_null(fd.signature()); 308 oop name = field_name_or_null(fd.name()); 309 if (name != NULL) 310 java_lang_invoke_MemberName::set_name(mname_oop, name); 311 if (type != NULL) 312 java_lang_invoke_MemberName::set_type(mname_oop, type); 313 // Note: name and type can be lazily computed by resolve_MemberName, 314 // if Java code needs them as resolved String and Class objects. 315 // Note that the incoming type oop might be pre-resolved (non-null). 316 // The base clazz and field offset (vmindex) must be eagerly stored, 317 // because they unambiguously identify the field. 318 // Although the fieldDescriptor::_index would also identify the field, 319 // we do not use it, because it is harder to decode. 320 // TO DO: maybe intern mname_oop 321 return mname(); 322} 323 324// JVM 2.9 Special Methods: 325// A method is signature polymorphic if and only if all of the following conditions hold : 326// * It is declared in the java.lang.invoke.MethodHandle class. 327// * It has a single formal parameter of type Object[]. 328// * It has a return type of Object. 329// * It has the ACC_VARARGS and ACC_NATIVE flags set. 330bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 331 if (klass == NULL) 332 return false; 333 // The following test will fail spuriously during bootstrap of MethodHandle itself: 334 // if (klass != SystemDictionary::MethodHandle_klass()) 335 // Test the name instead: 336 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle()) 337 return false; 338 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 339 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig); 340 if (m == NULL) return false; 341 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 342 int flags = m->access_flags().as_int(); 343 return (flags & required) == required; 344} 345 346 347Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 348 assert(is_signature_polymorphic_intrinsic(iid), "%d %s", iid, vmIntrinsics::name_at(iid)); 349 switch (iid) { 350 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 351 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 352 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 353 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 354 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 355 } 356 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 357 return 0; 358} 359 360int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 361 switch (iid) { 362 case vmIntrinsics::_invokeBasic: return 0; 363 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 364 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 365 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 366 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 367 } 368 fatal("unexpected intrinsic id: %d %s", iid, vmIntrinsics::name_at(iid)); 369 return 0; 370} 371 372vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 373 vmSymbols::SID name_id = vmSymbols::find_sid(name); 374 switch (name_id) { 375 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 376 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 377 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 378 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 379 380 // There is one static signature-polymorphic method for each JVM invocation mode. 381 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 382 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 383 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 384 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 385 } 386 387 // Cover the case of invokeExact and any future variants of invokeFoo. 388 Klass* mh_klass = SystemDictionary::well_known_klass( 389 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 390 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) 391 return vmIntrinsics::_invokeGeneric; 392 393 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 394 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 395 return vmIntrinsics::_none; 396} 397 398vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 399 if (klass != NULL && 400 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) { 401 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 402 if (iid != vmIntrinsics::_none) 403 return iid; 404 if (is_method_handle_invoke_name(klass, name)) 405 return vmIntrinsics::_invokeGeneric; 406 } 407 return vmIntrinsics::_none; 408} 409 410 411// convert the external string or reflective type to an internal signature 412Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 413 if (java_lang_invoke_MethodType::is_instance(type_str)) { 414 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 415 } else if (java_lang_Class::is_instance(type_str)) { 416 return java_lang_Class::as_signature(type_str, false, THREAD); 417 } else if (java_lang_String::is_instance_inlined(type_str)) { 418 if (intern_if_not_found) { 419 return java_lang_String::as_symbol(type_str, THREAD); 420 } else { 421 return java_lang_String::as_symbol_or_null(type_str); 422 } 423 } else { 424 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 425 } 426} 427 428static const char OBJ_SIG[] = "Ljava/lang/Object;"; 429enum { OBJ_SIG_LEN = 18 }; 430 431bool MethodHandles::is_basic_type_signature(Symbol* sig) { 432 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 433 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 434 const int len = sig->utf8_length(); 435 for (int i = 0; i < len; i++) { 436 switch (sig->byte_at(i)) { 437 case 'L': 438 // only java/lang/Object is valid here 439 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 440 return false; 441 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 442 continue; 443 case '(': case ')': case 'V': 444 case 'I': case 'J': case 'F': case 'D': 445 continue; 446 //case '[': 447 //case 'Z': case 'B': case 'C': case 'S': 448 default: 449 return false; 450 } 451 } 452 return true; 453} 454 455Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 456 Symbol* bsig = NULL; 457 if (sig == NULL) { 458 return sig; 459 } else if (is_basic_type_signature(sig)) { 460 sig->increment_refcount(); 461 return sig; // that was easy 462 } else if (sig->byte_at(0) != '(') { 463 BasicType bt = char2type(sig->byte_at(0)); 464 if (is_subword_type(bt)) { 465 bsig = vmSymbols::int_signature(); 466 } else { 467 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 468 bsig = vmSymbols::object_signature(); 469 } 470 } else { 471 ResourceMark rm; 472 stringStream buffer(128); 473 buffer.put('('); 474 int arg_pos = 0, keep_arg_pos = -1; 475 if (keep_last_arg) 476 keep_arg_pos = ArgumentCount(sig).size() - 1; 477 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 478 BasicType bt = ss.type(); 479 size_t this_arg_pos = buffer.size(); 480 if (ss.at_return_type()) { 481 buffer.put(')'); 482 } 483 if (arg_pos == keep_arg_pos) { 484 buffer.write((char*) ss.raw_bytes(), 485 (int) ss.raw_length()); 486 } else if (bt == T_OBJECT || bt == T_ARRAY) { 487 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 488 } else { 489 if (is_subword_type(bt)) 490 bt = T_INT; 491 buffer.put(type2char(bt)); 492 } 493 arg_pos++; 494 } 495 const char* sigstr = buffer.base(); 496 int siglen = (int) buffer.size(); 497 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 498 } 499 assert(is_basic_type_signature(bsig) || 500 // detune assert in case the injected argument is not a basic type: 501 keep_last_arg, ""); 502 return bsig; 503} 504 505void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 506 Symbol* sig, 507 bool keep_arrays, 508 bool keep_basic_names) { 509 st = st ? st : tty; 510 int len = sig->utf8_length(); 511 int array = 0; 512 bool prev_type = false; 513 for (int i = 0; i < len; i++) { 514 char ch = sig->byte_at(i); 515 switch (ch) { 516 case '(': case ')': 517 prev_type = false; 518 st->put(ch); 519 continue; 520 case '[': 521 if (!keep_basic_names && keep_arrays) 522 st->put(ch); 523 array++; 524 continue; 525 case 'L': 526 { 527 if (prev_type) st->put(','); 528 int start = i+1, slash = start; 529 while (++i < len && (ch = sig->byte_at(i)) != ';') { 530 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 531 } 532 if (slash < i) start = slash; 533 if (!keep_basic_names) { 534 st->put('L'); 535 } else { 536 for (int j = start; j < i; j++) 537 st->put(sig->byte_at(j)); 538 prev_type = true; 539 } 540 break; 541 } 542 default: 543 { 544 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 545 ch = '['; 546 array = 0; 547 } 548 if (prev_type) st->put(','); 549 const char* n = NULL; 550 if (keep_basic_names) 551 n = type2name(char2type(ch)); 552 if (n == NULL) { 553 // unknown letter, or we don't want to know its name 554 st->put(ch); 555 } else { 556 st->print("%s", n); 557 prev_type = true; 558 } 559 break; 560 } 561 } 562 // Switch break goes here to take care of array suffix: 563 if (prev_type) { 564 while (array > 0) { 565 st->print("[]"); 566 --array; 567 } 568 } 569 array = 0; 570 } 571} 572 573 574 575static oop object_java_mirror() { 576 return SystemDictionary::Object_klass()->java_mirror(); 577} 578 579oop MethodHandles::field_name_or_null(Symbol* s) { 580 if (s == NULL) return NULL; 581 return StringTable::lookup(s); 582} 583 584oop MethodHandles::field_signature_type_or_null(Symbol* s) { 585 if (s == NULL) return NULL; 586 BasicType bt = FieldType::basic_type(s); 587 if (is_java_primitive(bt)) { 588 assert(s->utf8_length() == 1, ""); 589 return java_lang_Class::primitive_mirror(bt); 590 } 591 // Here are some more short cuts for common types. 592 // They are optional, since reference types can be resolved lazily. 593 if (bt == T_OBJECT) { 594 if (s == vmSymbols::object_signature()) { 595 return object_java_mirror(); 596 } else if (s == vmSymbols::class_signature()) { 597 return SystemDictionary::Class_klass()->java_mirror(); 598 } else if (s == vmSymbols::string_signature()) { 599 return SystemDictionary::String_klass()->java_mirror(); 600 } 601 } 602 return NULL; 603} 604 605 606// An unresolved member name is a mere symbolic reference. 607// Resolving it plants a vmtarget/vmindex in it, 608// which refers directly to JVM internals. 609Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) { 610 Handle empty; 611 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 612 613 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 614 // Already resolved. 615 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 616 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 617 return mname; 618 } 619 620 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 621 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 622 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 623 int flags = java_lang_invoke_MemberName::flags(mname()); 624 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 625 if (!ref_kind_is_valid(ref_kind)) { 626 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 627 } 628 629 DEBUG_ONLY(int old_vmindex); 630 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 631 632 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 633 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 634 } 635 636 instanceKlassHandle defc; 637 { 638 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 639 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 640 if (!defc_klass->oop_is_instance()) { 641 if (!defc_klass->oop_is_array()) return empty; 642 defc_klass = SystemDictionary::Object_klass(); 643 } 644 defc = instanceKlassHandle(THREAD, defc_klass); 645 } 646 if (defc.is_null()) { 647 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 648 } 649 defc->link_class(CHECK_(empty)); // possible safepoint 650 651 // convert the external string name to an internal symbol 652 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 653 if (name == NULL) return empty; // no such name 654 if (name == vmSymbols::class_initializer_name()) 655 return empty; // illegal name 656 657 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 658 if ((flags & ALL_KINDS) == IS_METHOD && 659 (defc() == SystemDictionary::MethodHandle_klass()) && 660 (ref_kind == JVM_REF_invokeVirtual || 661 ref_kind == JVM_REF_invokeSpecial || 662 // static invocation mode is required for _linkToVirtual, etc.: 663 ref_kind == JVM_REF_invokeStatic)) { 664 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 665 if (iid != vmIntrinsics::_none && 666 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 667 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 668 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 669 mh_invoke_id = iid; 670 } 671 } 672 673 // convert the external string or reflective type to an internal signature 674 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 675 if (type == NULL) return empty; // no such signature exists in the VM 676 677 // Time to do the lookup. 678 switch (flags & ALL_KINDS) { 679 case IS_METHOD: 680 { 681 CallInfo result; 682 LinkInfo link_info(defc, name, type, caller, caller.not_null()); 683 { 684 assert(!HAS_PENDING_EXCEPTION, ""); 685 if (ref_kind == JVM_REF_invokeStatic) { 686 LinkResolver::resolve_static_call(result, 687 link_info, false, THREAD); 688 } else if (ref_kind == JVM_REF_invokeInterface) { 689 LinkResolver::resolve_interface_call(result, Handle(), defc, 690 link_info, false, THREAD); 691 } else if (mh_invoke_id != vmIntrinsics::_none) { 692 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 693 LinkResolver::resolve_handle_call(result, link_info, THREAD); 694 } else if (ref_kind == JVM_REF_invokeSpecial) { 695 LinkResolver::resolve_special_call(result, 696 link_info, THREAD); 697 } else if (ref_kind == JVM_REF_invokeVirtual) { 698 LinkResolver::resolve_virtual_call(result, Handle(), defc, 699 link_info, false, THREAD); 700 } else { 701 assert(false, "ref_kind=%d", ref_kind); 702 } 703 if (HAS_PENDING_EXCEPTION) { 704 return empty; 705 } 706 } 707 if (result.resolved_appendix().not_null()) { 708 // The resolved MemberName must not be accompanied by an appendix argument, 709 // since there is no way to bind this value into the MemberName. 710 // Caller is responsible to prevent this from happening. 711 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 712 } 713 oop mname2 = init_method_MemberName(mname, result); 714 return Handle(THREAD, mname2); 715 } 716 case IS_CONSTRUCTOR: 717 { 718 CallInfo result; 719 LinkInfo link_info(defc, name, type, caller, caller.not_null()); 720 { 721 assert(!HAS_PENDING_EXCEPTION, ""); 722 if (name == vmSymbols::object_initializer_name()) { 723 LinkResolver::resolve_special_call(result, link_info, THREAD); 724 } else { 725 break; // will throw after end of switch 726 } 727 if (HAS_PENDING_EXCEPTION) { 728 return empty; 729 } 730 } 731 assert(result.is_statically_bound(), ""); 732 oop mname2 = init_method_MemberName(mname, result); 733 return Handle(THREAD, mname2); 734 } 735 case IS_FIELD: 736 { 737 fieldDescriptor result; // find_field initializes fd if found 738 { 739 assert(!HAS_PENDING_EXCEPTION, ""); 740 LinkInfo link_info(defc, name, type, caller, /*check_access*/false); 741 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 742 if (HAS_PENDING_EXCEPTION) { 743 return empty; 744 } 745 } 746 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 747 return Handle(THREAD, mname2); 748 } 749 default: 750 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 751 } 752 753 return empty; 754} 755 756// Conversely, a member name which is only initialized from JVM internals 757// may have null defc, name, and type fields. 758// Resolving it plants a vmtarget/vmindex in it, 759// which refers directly to JVM internals. 760void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 761 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 762 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 763 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 764 if (vmtarget == NULL) { 765 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 766 } 767 768 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 769 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 770 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 771 int flags = java_lang_invoke_MemberName::flags(mname()); 772 773 if (suppress != 0) { 774 if (suppress & _suppress_defc) have_defc = true; 775 if (suppress & _suppress_name) have_name = true; 776 if (suppress & _suppress_type) have_type = true; 777 } 778 779 if (have_defc && have_name && have_type) return; // nothing needed 780 781 switch (flags & ALL_KINDS) { 782 case IS_METHOD: 783 case IS_CONSTRUCTOR: 784 { 785 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 786 methodHandle m(THREAD, (Method*)vmtarget); 787 DEBUG_ONLY(vmtarget = NULL); // safety 788 if (m.is_null()) break; 789 if (!have_defc) { 790 InstanceKlass* defc = m->method_holder(); 791 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 792 } 793 if (!have_name) { 794 //not java_lang_String::create_from_symbol; let's intern member names 795 Handle name = StringTable::intern(m->name(), CHECK); 796 java_lang_invoke_MemberName::set_name(mname(), name()); 797 } 798 if (!have_type) { 799 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 800 java_lang_invoke_MemberName::set_type(mname(), type()); 801 } 802 return; 803 } 804 case IS_FIELD: 805 { 806 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 807 if (!((Klass*) vmtarget)->oop_is_instance()) break; 808 instanceKlassHandle defc(THREAD, (Klass*) vmtarget); 809 DEBUG_ONLY(vmtarget = NULL); // safety 810 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 811 fieldDescriptor fd; // find_field initializes fd if found 812 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 813 break; // cannot expand 814 if (!have_defc) { 815 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 816 } 817 if (!have_name) { 818 //not java_lang_String::create_from_symbol; let's intern member names 819 Handle name = StringTable::intern(fd.name(), CHECK); 820 java_lang_invoke_MemberName::set_name(mname(), name()); 821 } 822 if (!have_type) { 823 // If it is a primitive field type, don't mess with short strings like "I". 824 Handle type = field_signature_type_or_null(fd.signature()); 825 if (type.is_null()) { 826 java_lang_String::create_from_symbol(fd.signature(), CHECK); 827 } 828 java_lang_invoke_MemberName::set_type(mname(), type()); 829 } 830 return; 831 } 832 } 833 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 834} 835 836int MethodHandles::find_MemberNames(KlassHandle k, 837 Symbol* name, Symbol* sig, 838 int mflags, KlassHandle caller, 839 int skip, objArrayHandle results) { 840 // %%% take caller into account! 841 842 Thread* thread = Thread::current(); 843 844 if (k.is_null() || !k->oop_is_instance()) return -1; 845 846 int rfill = 0, rlimit = results->length(), rskip = skip; 847 // overflow measurement: 848 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 849 850 int match_flags = mflags; 851 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 852 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 853 bool local_only = !(search_superc | search_intfc); 854 bool classes_only = false; 855 856 if (name != NULL) { 857 if (name->utf8_length() == 0) return 0; // a match is not possible 858 } 859 if (sig != NULL) { 860 if (sig->utf8_length() == 0) return 0; // a match is not possible 861 if (sig->byte_at(0) == '(') 862 match_flags &= ~(IS_FIELD | IS_TYPE); 863 else 864 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 865 } 866 867 if ((match_flags & IS_TYPE) != 0) { 868 // NYI, and Core Reflection works quite well for this query 869 } 870 871 if ((match_flags & IS_FIELD) != 0) { 872 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 873 if (name != NULL && st.name() != name) 874 continue; 875 if (sig != NULL && st.signature() != sig) 876 continue; 877 // passed the filters 878 if (rskip > 0) { 879 --rskip; 880 } else if (rfill < rlimit) { 881 Handle result(thread, results->obj_at(rfill++)); 882 if (!java_lang_invoke_MemberName::is_instance(result())) 883 return -99; // caller bug! 884 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 885 if (saved != result()) 886 results->obj_at_put(rfill-1, saved); // show saved instance to user 887 } else if (++overflow >= overflow_limit) { 888 match_flags = 0; break; // got tired of looking at overflow 889 } 890 } 891 } 892 893 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 894 // watch out for these guys: 895 Symbol* init_name = vmSymbols::object_initializer_name(); 896 Symbol* clinit_name = vmSymbols::class_initializer_name(); 897 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 898 bool negate_name_test = false; 899 // fix name so that it captures the intention of IS_CONSTRUCTOR 900 if (!(match_flags & IS_METHOD)) { 901 // constructors only 902 if (name == NULL) { 903 name = init_name; 904 } else if (name != init_name) { 905 return 0; // no constructors of this method name 906 } 907 } else if (!(match_flags & IS_CONSTRUCTOR)) { 908 // methods only 909 if (name == NULL) { 910 name = init_name; 911 negate_name_test = true; // if we see the name, we *omit* the entry 912 } else if (name == init_name) { 913 return 0; // no methods of this constructor name 914 } 915 } else { 916 // caller will accept either sort; no need to adjust name 917 } 918 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 919 Method* m = st.method(); 920 Symbol* m_name = m->name(); 921 if (m_name == clinit_name) 922 continue; 923 if (name != NULL && ((m_name != name) ^ negate_name_test)) 924 continue; 925 if (sig != NULL && m->signature() != sig) 926 continue; 927 // passed the filters 928 if (rskip > 0) { 929 --rskip; 930 } else if (rfill < rlimit) { 931 Handle result(thread, results->obj_at(rfill++)); 932 if (!java_lang_invoke_MemberName::is_instance(result())) 933 return -99; // caller bug! 934 CallInfo info(m); 935 oop saved = MethodHandles::init_method_MemberName(result, info); 936 if (saved != result()) 937 results->obj_at_put(rfill-1, saved); // show saved instance to user 938 } else if (++overflow >= overflow_limit) { 939 match_flags = 0; break; // got tired of looking at overflow 940 } 941 } 942 } 943 944 // return number of elements we at leasted wanted to initialize 945 return rfill + overflow; 946} 947 948void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 949 assert_locked_or_safepoint(CodeCache_lock); 950 951 oop context = java_lang_invoke_CallSite::context(call_site); 952 nmethodBucket* deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 953 954 nmethodBucket* new_deps = nmethodBucket::add_dependent_nmethod(deps, nm); 955 if (deps != new_deps) { 956 java_lang_invoke_MethodHandleNatives_CallSiteContext::set_vmdependencies(context, new_deps); 957 } 958} 959 960void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 961 assert_locked_or_safepoint(CodeCache_lock); 962 963 oop context = java_lang_invoke_CallSite::context(call_site); 964 nmethodBucket* deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 965 966 if (nmethodBucket::remove_dependent_nmethod(deps, nm)) { 967 nmethodBucket* new_deps = nmethodBucket::clean_dependent_nmethods(deps); 968 if (deps != new_deps) { 969 java_lang_invoke_MethodHandleNatives_CallSiteContext::set_vmdependencies(context, new_deps); 970 } 971 } 972} 973 974void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 975 assert_lock_strong(Compile_lock); 976 977 int marked = 0; 978 CallSiteDepChange changes(call_site(), target()); 979 { 980 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 981 982 oop context = java_lang_invoke_CallSite::context(call_site()); 983 nmethodBucket* deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 984 985 marked = nmethodBucket::mark_dependent_nmethods(deps, changes); 986 if (marked > 0) { 987 nmethodBucket* new_deps = nmethodBucket::clean_dependent_nmethods(deps); 988 if (deps != new_deps) { 989 java_lang_invoke_MethodHandleNatives_CallSiteContext::set_vmdependencies(context, new_deps); 990 } 991 } 992 } 993 if (marked > 0) { 994 // At least one nmethod has been marked for deoptimization 995 VM_Deoptimize op; 996 VMThread::execute(&op); 997 } 998} 999 1000//------------------------------------------------------------------------------ 1001// MemberNameTable 1002// 1003 1004MemberNameTable::MemberNameTable(int methods_cnt) 1005 : GrowableArray<jweak>(methods_cnt, true) { 1006 assert_locked_or_safepoint(MemberNameTable_lock); 1007} 1008 1009MemberNameTable::~MemberNameTable() { 1010 assert_locked_or_safepoint(MemberNameTable_lock); 1011 int len = this->length(); 1012 1013 for (int idx = 0; idx < len; idx++) { 1014 jweak ref = this->at(idx); 1015 JNIHandles::destroy_weak_global(ref); 1016 } 1017} 1018 1019void MemberNameTable::add_member_name(jweak mem_name_wref) { 1020 assert_locked_or_safepoint(MemberNameTable_lock); 1021 this->push(mem_name_wref); 1022} 1023 1024#if INCLUDE_JVMTI 1025// It is called at safepoint only for RedefineClasses 1026void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) { 1027 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 1028 // For each redefined method 1029 for (int idx = 0; idx < length(); idx++) { 1030 oop mem_name = JNIHandles::resolve(this->at(idx)); 1031 if (mem_name == NULL) { 1032 continue; 1033 } 1034 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); 1035 1036 if (old_method == NULL || !old_method->is_old()) { 1037 continue; // skip uninteresting entries 1038 } 1039 if (old_method->is_deleted()) { 1040 // skip entries with deleted methods 1041 continue; 1042 } 1043 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); 1044 1045 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 1046 assert(old_method != new_method, "sanity check"); 1047 1048 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method); 1049 1050 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 1051 if (!(*trace_name_printed)) { 1052 // RC_TRACE_MESG macro has an embedded ResourceMark 1053 RC_TRACE_MESG(("adjust: name=%s", 1054 old_method->method_holder()->external_name())); 1055 *trace_name_printed = true; 1056 } 1057 // RC_TRACE macro has an embedded ResourceMark 1058 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)", 1059 new_method->name()->as_C_string(), 1060 new_method->signature()->as_C_string())); 1061 } 1062 } 1063} 1064#endif // INCLUDE_JVMTI 1065 1066// 1067// Here are the native methods in java.lang.invoke.MethodHandleNatives 1068// They are the private interface between this JVM and the HotSpot-specific 1069// Java code that implements JSR 292 method handles. 1070// 1071// Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1072// that intrinsic (non-JNI) native methods are defined in HotSpot. 1073// 1074 1075#ifndef PRODUCT 1076#define EACH_NAMED_CON(template, requirement) \ 1077 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1078 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1079 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1080 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1081 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1082 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1083 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1084 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1085 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1086 /*end*/ 1087 1088#define IGNORE_REQ(req_expr) /* req_expr */ 1089#define ONE_PLUS(scope,value) 1+ 1090static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1091#define VALUE_COMMA(scope,value) scope::value, 1092static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1093#define STRING_NULL(scope,value) #value "\0" 1094static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1095 1096static bool advertise_con_value(int which) { 1097 if (which < 0) return false; 1098 bool ok = true; 1099 int count = 0; 1100#define INC_COUNT(scope,value) \ 1101 ++count; 1102#define CHECK_REQ(req_expr) \ 1103 if (which < count) return ok; \ 1104 ok = (req_expr); 1105 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1106#undef INC_COUNT 1107#undef CHECK_REQ 1108 assert(count == con_value_count, ""); 1109 if (which < count) return ok; 1110 return false; 1111} 1112 1113#undef ONE_PLUS 1114#undef VALUE_COMMA 1115#undef STRING_NULL 1116#undef EACH_NAMED_CON 1117#endif // PRODUCT 1118 1119JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1120#ifndef PRODUCT 1121 if (advertise_con_value(which)) { 1122 assert(which >= 0 && which < con_value_count, ""); 1123 int con = con_values[which]; 1124 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1125 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1126 const char* str = &con_names[0]; 1127 for (int i = 0; i < which; i++) 1128 str += strlen(str) + 1; // skip name and null 1129 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1130 box->obj_at_put(0, name); 1131 } 1132 return con; 1133 } 1134#endif 1135 return 0; 1136} 1137JVM_END 1138 1139// void init(MemberName self, AccessibleObject ref) 1140JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1141 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1142 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1143 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1144 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1145 MethodHandles::init_MemberName(mname, target); 1146} 1147JVM_END 1148 1149// void expand(MemberName self) 1150JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1151 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1152 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1153 MethodHandles::expand_MemberName(mname, 0, CHECK); 1154} 1155JVM_END 1156 1157// void resolve(MemberName self, Class<?> caller) 1158JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1159 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1160 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1161 1162 // The trusted Java code that calls this method should already have performed 1163 // access checks on behalf of the given caller. But, we can verify this. 1164 if (VerifyMethodHandles && caller_jh != NULL && 1165 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1166 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1167 if (reference_klass != NULL && reference_klass->oop_is_objArray()) { 1168 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1169 } 1170 1171 // Reflection::verify_class_access can only handle instance classes. 1172 if (reference_klass != NULL && reference_klass->oop_is_instance()) { 1173 // Emulate LinkResolver::check_klass_accessability. 1174 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1175 if (!Reflection::verify_class_access(caller, 1176 reference_klass, 1177 true)) { 1178 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1179 } 1180 } 1181 } 1182 1183 KlassHandle caller(THREAD, 1184 caller_jh == NULL ? (Klass*) NULL : 1185 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh))); 1186 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1187 1188 if (resolved.is_null()) { 1189 int flags = java_lang_invoke_MemberName::flags(mname()); 1190 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1191 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1192 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1193 } 1194 if ((flags & ALL_KINDS) == IS_FIELD) { 1195 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); 1196 } else if ((flags & ALL_KINDS) == IS_METHOD || 1197 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1198 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); 1199 } else { 1200 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1201 } 1202 } 1203 1204 return JNIHandles::make_local(THREAD, resolved()); 1205} 1206JVM_END 1207 1208static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1209 if (mname == NULL || 1210 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1211 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1212 } else { 1213 int flags = java_lang_invoke_MemberName::flags(mname); 1214 if ((flags & IS_FIELD) != 0 && 1215 (must_be_static 1216 ? (flags & JVM_ACC_STATIC) != 0 1217 : (flags & JVM_ACC_STATIC) == 0)) { 1218 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1219 return (jlong) vmindex; 1220 } 1221 } 1222 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1223 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1224 return 0; 1225} 1226 1227JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1228 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1229} 1230JVM_END 1231 1232JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1233 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1234} 1235JVM_END 1236 1237JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1238 // use the other function to perform sanity checks: 1239 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1240 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1241 return JNIHandles::make_local(THREAD, clazz); 1242} 1243JVM_END 1244 1245JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1246 if (mname_jh == NULL) return NULL; 1247 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1248 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1249 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1250 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1251 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1252 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1253 result->obj_at_put(0, x); 1254 x = NULL; 1255 if (vmtarget == NULL) { 1256 x = NULL; 1257 } else if (vmtarget->is_klass()) { 1258 x = ((Klass*) vmtarget)->java_mirror(); 1259 } else if (vmtarget->is_method()) { 1260 x = mname(); 1261 } 1262 result->obj_at_put(1, x); 1263 return JNIHandles::make_local(env, result()); 1264} 1265JVM_END 1266 1267 1268 1269// static native int getMembers(Class<?> defc, String matchName, String matchSig, 1270// int matchFlags, Class<?> caller, int skip, MemberName[] results); 1271JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1272 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1273 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1274 if (clazz_jh == NULL || results_jh == NULL) return -1; 1275 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); 1276 1277 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1278 if (results.is_null() || !results->is_objArray()) return -1; 1279 1280 TempNewSymbol name = NULL; 1281 TempNewSymbol sig = NULL; 1282 if (name_jh != NULL) { 1283 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1284 if (name == NULL) return 0; // a match is not possible 1285 } 1286 if (sig_jh != NULL) { 1287 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1288 if (sig == NULL) return 0; // a match is not possible 1289 } 1290 1291 KlassHandle caller; 1292 if (caller_jh != NULL) { 1293 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1294 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1295 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); 1296 } 1297 1298 if (name != NULL && sig != NULL && results.not_null()) { 1299 // try a direct resolve 1300 // %%% TO DO 1301 } 1302 1303 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1304 caller, skip, results); 1305 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1306 return res; 1307} 1308JVM_END 1309 1310JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1311 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1312 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1313 { 1314 // Walk all nmethods depending on this call site. 1315 MutexLocker mu(Compile_lock, thread); 1316 MethodHandles::flush_dependent_nmethods(call_site, target); 1317 java_lang_invoke_CallSite::set_target(call_site(), target()); 1318 } 1319} 1320JVM_END 1321 1322JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1323 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1324 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1325 { 1326 // Walk all nmethods depending on this call site. 1327 MutexLocker mu(Compile_lock, thread); 1328 MethodHandles::flush_dependent_nmethods(call_site, target); 1329 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1330 } 1331} 1332JVM_END 1333 1334JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1335 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1336 { 1337 // Walk all nmethods depending on this call site. 1338 MutexLocker mu1(Compile_lock, thread); 1339 1340 int marked = 0; 1341 { 1342 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1343 nmethodBucket* b = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1344 while(b != NULL) { 1345 nmethod* nm = b->get_nmethod(); 1346 if (b->count() > 0 && nm->is_alive() && !nm->is_marked_for_deoptimization()) { 1347 nm->mark_for_deoptimization(); 1348 marked++; 1349 } 1350 nmethodBucket* next = b->next(); 1351 delete b; 1352 b = next; 1353 } 1354 java_lang_invoke_MethodHandleNatives_CallSiteContext::set_vmdependencies(context(), NULL); // reset context 1355 } 1356 if (marked > 0) { 1357 // At least one nmethod has been marked for deoptimization 1358 VM_Deoptimize op; 1359 VMThread::execute(&op); 1360 } 1361 } 1362} 1363JVM_END 1364 1365/** 1366 * Throws a java/lang/UnsupportedOperationException unconditionally. 1367 * This is required by the specification of MethodHandle.invoke if 1368 * invoked directly. 1369 */ 1370JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1371 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1372 return NULL; 1373} 1374JVM_END 1375 1376/** 1377 * Throws a java/lang/UnsupportedOperationException unconditionally. 1378 * This is required by the specification of MethodHandle.invokeExact if 1379 * invoked directly. 1380 */ 1381JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1382 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1383 return NULL; 1384} 1385JVM_END 1386 1387/// JVM_RegisterMethodHandleMethods 1388 1389#undef CS // Solaris builds complain 1390 1391#define LANG "Ljava/lang/" 1392#define JLINV "Ljava/lang/invoke/" 1393 1394#define OBJ LANG "Object;" 1395#define CLS LANG "Class;" 1396#define STRG LANG "String;" 1397#define CS JLINV "CallSite;" 1398#define MT JLINV "MethodType;" 1399#define MH JLINV "MethodHandle;" 1400#define MEM JLINV "MemberName;" 1401#define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1402 1403#define CC (char*) /*cast a literal from (const char*)*/ 1404#define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1405 1406// These are the native methods on java.lang.invoke.MethodHandleNatives. 1407static JNINativeMethod MHN_methods[] = { 1408 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1409 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1410 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)}, 1411 // static native int getNamedCon(int which, Object[] name) 1412 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1413 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1414 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1415 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1416 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1417 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1418 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1419 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1420 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1421 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1422 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1423}; 1424 1425static JNINativeMethod MH_methods[] = { 1426 // UnsupportedOperationException throwers 1427 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1428 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1429}; 1430 1431/** 1432 * Helper method to register native methods. 1433 */ 1434static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1435 int status = env->RegisterNatives(clazz, methods, nMethods); 1436 if (status != JNI_OK || env->ExceptionOccurred()) { 1437 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 1438 env->ExceptionClear(); 1439 return false; 1440 } 1441 return true; 1442} 1443 1444/** 1445 * This one function is exported, used by NativeLookup. 1446 */ 1447JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1448 assert(!MethodHandles::enabled(), "must not be enabled"); 1449 bool enable_MH = true; 1450 1451 jclass MH_class = NULL; 1452 if (SystemDictionary::MethodHandle_klass() == NULL) { 1453 enable_MH = false; 1454 } else { 1455 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1456 MH_class = (jclass) JNIHandles::make_local(env, mirror); 1457 } 1458 1459 if (enable_MH) { 1460 ThreadToNativeFromVM ttnfv(thread); 1461 1462 if (enable_MH) { 1463 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1464 } 1465 if (enable_MH) { 1466 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1467 } 1468 } 1469 1470 if (TraceInvokeDynamic) { 1471 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1472 } 1473 1474 if (enable_MH) { 1475 if (MethodHandles::generate_adapters() == false) { 1476 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters"); 1477 } 1478 MethodHandles::set_enabled(true); 1479 } 1480} 1481JVM_END 1482