methodHandles.cpp revision 8638:767f36deb0dc
1/* 2 * Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/javaClasses.inline.hpp" 27#include "classfile/stringTable.hpp" 28#include "code/codeCache.hpp" 29#include "compiler/compileBroker.hpp" 30#include "interpreter/interpreter.hpp" 31#include "interpreter/oopMapCache.hpp" 32#include "interpreter/linkResolver.hpp" 33#include "memory/allocation.inline.hpp" 34#include "memory/oopFactory.hpp" 35#include "oops/objArrayOop.inline.hpp" 36#include "oops/oop.inline.hpp" 37#include "prims/methodHandles.hpp" 38#include "prims/jvmtiRedefineClassesTrace.hpp" 39#include "runtime/compilationPolicy.hpp" 40#include "runtime/javaCalls.hpp" 41#include "runtime/reflection.hpp" 42#include "runtime/signature.hpp" 43#include "runtime/stubRoutines.hpp" 44#include "utilities/exceptions.hpp" 45 46 47/* 48 * JSR 292 reference implementation: method handles 49 * The JDK 7 reference implementation represented method handle 50 * combinations as chains. Each link in the chain had a "vmentry" 51 * field which pointed at a bit of assembly code which performed 52 * one transformation before dispatching to the next link in the chain. 53 * 54 * The current reference implementation pushes almost all code generation 55 * responsibility to (trusted) Java code. A method handle contains a 56 * pointer to its "LambdaForm", which embodies all details of the method 57 * handle's behavior. The LambdaForm is a normal Java object, managed 58 * by a runtime coded in Java. 59 */ 60 61bool MethodHandles::_enabled = false; // set true after successful native linkage 62MethodHandlesAdapterBlob* MethodHandles::_adapter_code = NULL; 63 64 65/** 66 * Generates method handle adapters. Returns 'false' if memory allocation 67 * failed and true otherwise. 68 */ 69bool MethodHandles::generate_adapters() { 70 if (SystemDictionary::MethodHandle_klass() == NULL) { 71 return true; 72 } 73 74 assert(_adapter_code == NULL, "generate only once"); 75 76 ResourceMark rm; 77 TraceTime timer("MethodHandles adapters generation", TraceStartupTime); 78 _adapter_code = MethodHandlesAdapterBlob::create(adapter_code_size); 79 if (_adapter_code == NULL) { 80 return false; 81 } 82 83 CodeBuffer code(_adapter_code); 84 MethodHandlesAdapterGenerator g(&code); 85 g.generate(); 86 code.log_section_sizes("MethodHandlesAdapterBlob"); 87 return true; 88} 89 90//------------------------------------------------------------------------------ 91// MethodHandlesAdapterGenerator::generate 92// 93void MethodHandlesAdapterGenerator::generate() { 94 // Generate generic method handle adapters. 95 // Generate interpreter entries 96 for (Interpreter::MethodKind mk = Interpreter::method_handle_invoke_FIRST; 97 mk <= Interpreter::method_handle_invoke_LAST; 98 mk = Interpreter::MethodKind(1 + (int)mk)) { 99 vmIntrinsics::ID iid = Interpreter::method_handle_intrinsic(mk); 100 StubCodeMark mark(this, "MethodHandle::interpreter_entry", vmIntrinsics::name_at(iid)); 101 address entry = MethodHandles::generate_method_handle_interpreter_entry(_masm, iid); 102 if (entry != NULL) { 103 Interpreter::set_entry_for_kind(mk, entry); 104 } 105 // If the entry is not set, it will throw AbstractMethodError. 106 } 107} 108 109void MethodHandles::set_enabled(bool z) { 110 if (_enabled != z) { 111 guarantee(z, "can only enable once"); 112 _enabled = z; 113 } 114} 115 116// MemberName support 117 118// import java_lang_invoke_MemberName.* 119enum { 120 IS_METHOD = java_lang_invoke_MemberName::MN_IS_METHOD, 121 IS_CONSTRUCTOR = java_lang_invoke_MemberName::MN_IS_CONSTRUCTOR, 122 IS_FIELD = java_lang_invoke_MemberName::MN_IS_FIELD, 123 IS_TYPE = java_lang_invoke_MemberName::MN_IS_TYPE, 124 CALLER_SENSITIVE = java_lang_invoke_MemberName::MN_CALLER_SENSITIVE, 125 REFERENCE_KIND_SHIFT = java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, 126 REFERENCE_KIND_MASK = java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK, 127 SEARCH_SUPERCLASSES = java_lang_invoke_MemberName::MN_SEARCH_SUPERCLASSES, 128 SEARCH_INTERFACES = java_lang_invoke_MemberName::MN_SEARCH_INTERFACES, 129 ALL_KINDS = IS_METHOD | IS_CONSTRUCTOR | IS_FIELD | IS_TYPE 130}; 131 132Handle MethodHandles::new_MemberName(TRAPS) { 133 Handle empty; 134 instanceKlassHandle k(THREAD, SystemDictionary::MemberName_klass()); 135 if (!k->is_initialized()) k->initialize(CHECK_(empty)); 136 return Handle(THREAD, k->allocate_instance(THREAD)); 137} 138 139oop MethodHandles::init_MemberName(Handle mname, Handle target) { 140 // This method is used from java.lang.invoke.MemberName constructors. 141 // It fills in the new MemberName from a java.lang.reflect.Member. 142 Thread* thread = Thread::current(); 143 oop target_oop = target(); 144 Klass* target_klass = target_oop->klass(); 145 if (target_klass == SystemDictionary::reflect_Field_klass()) { 146 oop clazz = java_lang_reflect_Field::clazz(target_oop); // fd.field_holder() 147 int slot = java_lang_reflect_Field::slot(target_oop); // fd.index() 148 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 149 if (!k.is_null() && k->oop_is_instance()) { 150 fieldDescriptor fd(InstanceKlass::cast(k()), slot); 151 oop mname2 = init_field_MemberName(mname, fd); 152 if (mname2 != NULL) { 153 // Since we have the reified name and type handy, add them to the result. 154 if (java_lang_invoke_MemberName::name(mname2) == NULL) 155 java_lang_invoke_MemberName::set_name(mname2, java_lang_reflect_Field::name(target_oop)); 156 if (java_lang_invoke_MemberName::type(mname2) == NULL) 157 java_lang_invoke_MemberName::set_type(mname2, java_lang_reflect_Field::type(target_oop)); 158 } 159 return mname2; 160 } 161 } else if (target_klass == SystemDictionary::reflect_Method_klass()) { 162 oop clazz = java_lang_reflect_Method::clazz(target_oop); 163 int slot = java_lang_reflect_Method::slot(target_oop); 164 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 165 if (!k.is_null() && k->oop_is_instance()) { 166 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 167 if (m == NULL || is_signature_polymorphic(m->intrinsic_id())) 168 return NULL; // do not resolve unless there is a concrete signature 169 CallInfo info(m, k()); 170 return init_method_MemberName(mname, info); 171 } 172 } else if (target_klass == SystemDictionary::reflect_Constructor_klass()) { 173 oop clazz = java_lang_reflect_Constructor::clazz(target_oop); 174 int slot = java_lang_reflect_Constructor::slot(target_oop); 175 KlassHandle k(thread, java_lang_Class::as_Klass(clazz)); 176 if (!k.is_null() && k->oop_is_instance()) { 177 Method* m = InstanceKlass::cast(k())->method_with_idnum(slot); 178 if (m == NULL) return NULL; 179 CallInfo info(m, k()); 180 return init_method_MemberName(mname, info); 181 } 182 } 183 return NULL; 184} 185 186oop MethodHandles::init_method_MemberName(Handle mname, CallInfo& info) { 187 assert(info.resolved_appendix().is_null(), "only normal methods here"); 188 methodHandle m = info.resolved_method(); 189 assert(m.not_null(), "null method handle"); 190 KlassHandle m_klass = m->method_holder(); 191 assert(m.not_null(), "null holder for method handle"); 192 int flags = (jushort)( m->access_flags().as_short() & JVM_RECOGNIZED_METHOD_MODIFIERS ); 193 int vmindex = Method::invalid_vtable_index; 194 195 switch (info.call_kind()) { 196 case CallInfo::itable_call: 197 vmindex = info.itable_index(); 198 // More importantly, the itable index only works with the method holder. 199 assert(m_klass->verify_itable_index(vmindex), ""); 200 flags |= IS_METHOD | (JVM_REF_invokeInterface << REFERENCE_KIND_SHIFT); 201 if (TraceInvokeDynamic) { 202 ResourceMark rm; 203 tty->print_cr("memberName: invokeinterface method_holder::method: %s, itableindex: %d, access_flags:", 204 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 205 vmindex); 206 m->access_flags().print_on(tty); 207 if (!m->is_abstract()) { 208 tty->print("default"); 209 } 210 tty->cr(); 211 } 212 break; 213 214 case CallInfo::vtable_call: 215 vmindex = info.vtable_index(); 216 flags |= IS_METHOD | (JVM_REF_invokeVirtual << REFERENCE_KIND_SHIFT); 217 assert(info.resolved_klass()->is_subtype_of(m_klass()), "virtual call must be type-safe"); 218 if (m_klass->is_interface()) { 219 // This is a vtable call to an interface method (abstract "miranda method" or default method). 220 // The vtable index is meaningless without a class (not interface) receiver type, so get one. 221 // (LinkResolver should help us figure this out.) 222 KlassHandle m_klass_non_interface = info.resolved_klass(); 223 if (m_klass_non_interface->is_interface()) { 224 m_klass_non_interface = SystemDictionary::Object_klass(); 225#ifdef ASSERT 226 { ResourceMark rm; 227 Method* m2 = m_klass_non_interface->vtable()->method_at(vmindex); 228 assert(m->name() == m2->name() && m->signature() == m2->signature(), 229 err_msg("at %d, %s != %s", vmindex, 230 m->name_and_sig_as_C_string(), m2->name_and_sig_as_C_string())); 231 } 232#endif //ASSERT 233 } 234 if (!m->is_public()) { 235 assert(m->is_public(), "virtual call must be to public interface method"); 236 return NULL; // elicit an error later in product build 237 } 238 assert(info.resolved_klass()->is_subtype_of(m_klass_non_interface()), "virtual call must be type-safe"); 239 m_klass = m_klass_non_interface; 240 } 241 if (TraceInvokeDynamic) { 242 ResourceMark rm; 243 tty->print_cr("memberName: invokevirtual method_holder::method: %s, receiver: %s, vtableindex: %d, access_flags:", 244 Method::name_and_sig_as_C_string(m->method_holder(), m->name(), m->signature()), 245 m_klass->internal_name(), vmindex); 246 m->access_flags().print_on(tty); 247 if (m->is_default_method()) { 248 tty->print("default"); 249 } 250 tty->cr(); 251 } 252 break; 253 254 case CallInfo::direct_call: 255 vmindex = Method::nonvirtual_vtable_index; 256 if (m->is_static()) { 257 flags |= IS_METHOD | (JVM_REF_invokeStatic << REFERENCE_KIND_SHIFT); 258 } else if (m->is_initializer()) { 259 flags |= IS_CONSTRUCTOR | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 260 } else { 261 flags |= IS_METHOD | (JVM_REF_invokeSpecial << REFERENCE_KIND_SHIFT); 262 } 263 break; 264 265 default: assert(false, "bad CallInfo"); return NULL; 266 } 267 268 // @CallerSensitive annotation detected 269 if (m->caller_sensitive()) { 270 flags |= CALLER_SENSITIVE; 271 } 272 273 oop mname_oop = mname(); 274 java_lang_invoke_MemberName::set_flags( mname_oop, flags); 275 java_lang_invoke_MemberName::set_vmtarget(mname_oop, m()); 276 java_lang_invoke_MemberName::set_vmindex( mname_oop, vmindex); // vtable/itable index 277 java_lang_invoke_MemberName::set_clazz( mname_oop, m_klass->java_mirror()); 278 // Note: name and type can be lazily computed by resolve_MemberName, 279 // if Java code needs them as resolved String and MethodType objects. 280 // The clazz must be eagerly stored, because it provides a GC 281 // root to help keep alive the Method*. 282 // If relevant, the vtable or itable value is stored as vmindex. 283 // This is done eagerly, since it is readily available without 284 // constructing any new objects. 285 // TO DO: maybe intern mname_oop 286 if (m->method_holder()->add_member_name(mname)) { 287 return mname(); 288 } else { 289 // Redefinition caused this to fail. Return NULL (and an exception?) 290 return NULL; 291 } 292} 293 294oop MethodHandles::init_field_MemberName(Handle mname, fieldDescriptor& fd, bool is_setter) { 295 int flags = (jushort)( fd.access_flags().as_short() & JVM_RECOGNIZED_FIELD_MODIFIERS ); 296 flags |= IS_FIELD | ((fd.is_static() ? JVM_REF_getStatic : JVM_REF_getField) << REFERENCE_KIND_SHIFT); 297 if (is_setter) flags += ((JVM_REF_putField - JVM_REF_getField) << REFERENCE_KIND_SHIFT); 298 Metadata* vmtarget = fd.field_holder(); 299 int vmindex = fd.offset(); // determines the field uniquely when combined with static bit 300 oop mname_oop = mname(); 301 java_lang_invoke_MemberName::set_flags(mname_oop, flags); 302 java_lang_invoke_MemberName::set_vmtarget(mname_oop, vmtarget); 303 java_lang_invoke_MemberName::set_vmindex(mname_oop, vmindex); 304 java_lang_invoke_MemberName::set_clazz(mname_oop, fd.field_holder()->java_mirror()); 305 oop type = field_signature_type_or_null(fd.signature()); 306 oop name = field_name_or_null(fd.name()); 307 if (name != NULL) 308 java_lang_invoke_MemberName::set_name(mname_oop, name); 309 if (type != NULL) 310 java_lang_invoke_MemberName::set_type(mname_oop, type); 311 // Note: name and type can be lazily computed by resolve_MemberName, 312 // if Java code needs them as resolved String and Class objects. 313 // Note that the incoming type oop might be pre-resolved (non-null). 314 // The base clazz and field offset (vmindex) must be eagerly stored, 315 // because they unambiguously identify the field. 316 // Although the fieldDescriptor::_index would also identify the field, 317 // we do not use it, because it is harder to decode. 318 // TO DO: maybe intern mname_oop 319 return mname(); 320} 321 322// JVM 2.9 Special Methods: 323// A method is signature polymorphic if and only if all of the following conditions hold : 324// * It is declared in the java.lang.invoke.MethodHandle class. 325// * It has a single formal parameter of type Object[]. 326// * It has a return type of Object. 327// * It has the ACC_VARARGS and ACC_NATIVE flags set. 328bool MethodHandles::is_method_handle_invoke_name(Klass* klass, Symbol* name) { 329 if (klass == NULL) 330 return false; 331 // The following test will fail spuriously during bootstrap of MethodHandle itself: 332 // if (klass != SystemDictionary::MethodHandle_klass()) 333 // Test the name instead: 334 if (klass->name() != vmSymbols::java_lang_invoke_MethodHandle()) 335 return false; 336 Symbol* poly_sig = vmSymbols::object_array_object_signature(); 337 Method* m = InstanceKlass::cast(klass)->find_method(name, poly_sig); 338 if (m == NULL) return false; 339 int required = JVM_ACC_NATIVE | JVM_ACC_VARARGS; 340 int flags = m->access_flags().as_int(); 341 return (flags & required) == required; 342} 343 344 345Symbol* MethodHandles::signature_polymorphic_intrinsic_name(vmIntrinsics::ID iid) { 346 assert(is_signature_polymorphic_intrinsic(iid), err_msg("iid=%d", iid)); 347 switch (iid) { 348 case vmIntrinsics::_invokeBasic: return vmSymbols::invokeBasic_name(); 349 case vmIntrinsics::_linkToVirtual: return vmSymbols::linkToVirtual_name(); 350 case vmIntrinsics::_linkToStatic: return vmSymbols::linkToStatic_name(); 351 case vmIntrinsics::_linkToSpecial: return vmSymbols::linkToSpecial_name(); 352 case vmIntrinsics::_linkToInterface: return vmSymbols::linkToInterface_name(); 353 } 354 assert(false, ""); 355 return 0; 356} 357 358int MethodHandles::signature_polymorphic_intrinsic_ref_kind(vmIntrinsics::ID iid) { 359 switch (iid) { 360 case vmIntrinsics::_invokeBasic: return 0; 361 case vmIntrinsics::_linkToVirtual: return JVM_REF_invokeVirtual; 362 case vmIntrinsics::_linkToStatic: return JVM_REF_invokeStatic; 363 case vmIntrinsics::_linkToSpecial: return JVM_REF_invokeSpecial; 364 case vmIntrinsics::_linkToInterface: return JVM_REF_invokeInterface; 365 } 366 assert(false, err_msg("iid=%d", iid)); 367 return 0; 368} 369 370vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Symbol* name) { 371 vmSymbols::SID name_id = vmSymbols::find_sid(name); 372 switch (name_id) { 373 // The ID _invokeGeneric stands for all non-static signature-polymorphic methods, except built-ins. 374 case vmSymbols::VM_SYMBOL_ENUM_NAME(invoke_name): return vmIntrinsics::_invokeGeneric; 375 // The only built-in non-static signature-polymorphic method is MethodHandle.invokeBasic: 376 case vmSymbols::VM_SYMBOL_ENUM_NAME(invokeBasic_name): return vmIntrinsics::_invokeBasic; 377 378 // There is one static signature-polymorphic method for each JVM invocation mode. 379 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToVirtual_name): return vmIntrinsics::_linkToVirtual; 380 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToStatic_name): return vmIntrinsics::_linkToStatic; 381 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToSpecial_name): return vmIntrinsics::_linkToSpecial; 382 case vmSymbols::VM_SYMBOL_ENUM_NAME(linkToInterface_name): return vmIntrinsics::_linkToInterface; 383 } 384 385 // Cover the case of invokeExact and any future variants of invokeFoo. 386 Klass* mh_klass = SystemDictionary::well_known_klass( 387 SystemDictionary::WK_KLASS_ENUM_NAME(MethodHandle_klass) ); 388 if (mh_klass != NULL && is_method_handle_invoke_name(mh_klass, name)) 389 return vmIntrinsics::_invokeGeneric; 390 391 // Note: The pseudo-intrinsic _compiledLambdaForm is never linked against. 392 // Instead it is used to mark lambda forms bound to invokehandle or invokedynamic. 393 return vmIntrinsics::_none; 394} 395 396vmIntrinsics::ID MethodHandles::signature_polymorphic_name_id(Klass* klass, Symbol* name) { 397 if (klass != NULL && 398 klass->name() == vmSymbols::java_lang_invoke_MethodHandle()) { 399 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 400 if (iid != vmIntrinsics::_none) 401 return iid; 402 if (is_method_handle_invoke_name(klass, name)) 403 return vmIntrinsics::_invokeGeneric; 404 } 405 return vmIntrinsics::_none; 406} 407 408 409// convert the external string or reflective type to an internal signature 410Symbol* MethodHandles::lookup_signature(oop type_str, bool intern_if_not_found, TRAPS) { 411 if (java_lang_invoke_MethodType::is_instance(type_str)) { 412 return java_lang_invoke_MethodType::as_signature(type_str, intern_if_not_found, THREAD); 413 } else if (java_lang_Class::is_instance(type_str)) { 414 return java_lang_Class::as_signature(type_str, false, THREAD); 415 } else if (java_lang_String::is_instance_inlined(type_str)) { 416 if (intern_if_not_found) { 417 return java_lang_String::as_symbol(type_str, THREAD); 418 } else { 419 return java_lang_String::as_symbol_or_null(type_str); 420 } 421 } else { 422 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized type", NULL); 423 } 424} 425 426static const char OBJ_SIG[] = "Ljava/lang/Object;"; 427enum { OBJ_SIG_LEN = 18 }; 428 429bool MethodHandles::is_basic_type_signature(Symbol* sig) { 430 assert(vmSymbols::object_signature()->utf8_length() == (int)OBJ_SIG_LEN, ""); 431 assert(vmSymbols::object_signature()->equals(OBJ_SIG), ""); 432 const int len = sig->utf8_length(); 433 for (int i = 0; i < len; i++) { 434 switch (sig->byte_at(i)) { 435 case 'L': 436 // only java/lang/Object is valid here 437 if (sig->index_of_at(i, OBJ_SIG, OBJ_SIG_LEN) != i) 438 return false; 439 i += OBJ_SIG_LEN-1; //-1 because of i++ in loop 440 continue; 441 case '(': case ')': case 'V': 442 case 'I': case 'J': case 'F': case 'D': 443 continue; 444 //case '[': 445 //case 'Z': case 'B': case 'C': case 'S': 446 default: 447 return false; 448 } 449 } 450 return true; 451} 452 453Symbol* MethodHandles::lookup_basic_type_signature(Symbol* sig, bool keep_last_arg, TRAPS) { 454 Symbol* bsig = NULL; 455 if (sig == NULL) { 456 return sig; 457 } else if (is_basic_type_signature(sig)) { 458 sig->increment_refcount(); 459 return sig; // that was easy 460 } else if (sig->byte_at(0) != '(') { 461 BasicType bt = char2type(sig->byte_at(0)); 462 if (is_subword_type(bt)) { 463 bsig = vmSymbols::int_signature(); 464 } else { 465 assert(bt == T_OBJECT || bt == T_ARRAY, "is_basic_type_signature was false"); 466 bsig = vmSymbols::object_signature(); 467 } 468 } else { 469 ResourceMark rm; 470 stringStream buffer(128); 471 buffer.put('('); 472 int arg_pos = 0, keep_arg_pos = -1; 473 if (keep_last_arg) 474 keep_arg_pos = ArgumentCount(sig).size() - 1; 475 for (SignatureStream ss(sig); !ss.is_done(); ss.next()) { 476 BasicType bt = ss.type(); 477 size_t this_arg_pos = buffer.size(); 478 if (ss.at_return_type()) { 479 buffer.put(')'); 480 } 481 if (arg_pos == keep_arg_pos) { 482 buffer.write((char*) ss.raw_bytes(), 483 (int) ss.raw_length()); 484 } else if (bt == T_OBJECT || bt == T_ARRAY) { 485 buffer.write(OBJ_SIG, OBJ_SIG_LEN); 486 } else { 487 if (is_subword_type(bt)) 488 bt = T_INT; 489 buffer.put(type2char(bt)); 490 } 491 arg_pos++; 492 } 493 const char* sigstr = buffer.base(); 494 int siglen = (int) buffer.size(); 495 bsig = SymbolTable::new_symbol(sigstr, siglen, THREAD); 496 } 497 assert(is_basic_type_signature(bsig) || 498 // detune assert in case the injected argument is not a basic type: 499 keep_last_arg, ""); 500 return bsig; 501} 502 503void MethodHandles::print_as_basic_type_signature_on(outputStream* st, 504 Symbol* sig, 505 bool keep_arrays, 506 bool keep_basic_names) { 507 st = st ? st : tty; 508 int len = sig->utf8_length(); 509 int array = 0; 510 bool prev_type = false; 511 for (int i = 0; i < len; i++) { 512 char ch = sig->byte_at(i); 513 switch (ch) { 514 case '(': case ')': 515 prev_type = false; 516 st->put(ch); 517 continue; 518 case '[': 519 if (!keep_basic_names && keep_arrays) 520 st->put(ch); 521 array++; 522 continue; 523 case 'L': 524 { 525 if (prev_type) st->put(','); 526 int start = i+1, slash = start; 527 while (++i < len && (ch = sig->byte_at(i)) != ';') { 528 if (ch == '/' || ch == '.' || ch == '$') slash = i+1; 529 } 530 if (slash < i) start = slash; 531 if (!keep_basic_names) { 532 st->put('L'); 533 } else { 534 for (int j = start; j < i; j++) 535 st->put(sig->byte_at(j)); 536 prev_type = true; 537 } 538 break; 539 } 540 default: 541 { 542 if (array && char2type(ch) != T_ILLEGAL && !keep_arrays) { 543 ch = '['; 544 array = 0; 545 } 546 if (prev_type) st->put(','); 547 const char* n = NULL; 548 if (keep_basic_names) 549 n = type2name(char2type(ch)); 550 if (n == NULL) { 551 // unknown letter, or we don't want to know its name 552 st->put(ch); 553 } else { 554 st->print("%s", n); 555 prev_type = true; 556 } 557 break; 558 } 559 } 560 // Switch break goes here to take care of array suffix: 561 if (prev_type) { 562 while (array > 0) { 563 st->print("[]"); 564 --array; 565 } 566 } 567 array = 0; 568 } 569} 570 571 572 573static oop object_java_mirror() { 574 return SystemDictionary::Object_klass()->java_mirror(); 575} 576 577oop MethodHandles::field_name_or_null(Symbol* s) { 578 if (s == NULL) return NULL; 579 return StringTable::lookup(s); 580} 581 582oop MethodHandles::field_signature_type_or_null(Symbol* s) { 583 if (s == NULL) return NULL; 584 BasicType bt = FieldType::basic_type(s); 585 if (is_java_primitive(bt)) { 586 assert(s->utf8_length() == 1, ""); 587 return java_lang_Class::primitive_mirror(bt); 588 } 589 // Here are some more short cuts for common types. 590 // They are optional, since reference types can be resolved lazily. 591 if (bt == T_OBJECT) { 592 if (s == vmSymbols::object_signature()) { 593 return object_java_mirror(); 594 } else if (s == vmSymbols::class_signature()) { 595 return SystemDictionary::Class_klass()->java_mirror(); 596 } else if (s == vmSymbols::string_signature()) { 597 return SystemDictionary::String_klass()->java_mirror(); 598 } 599 } 600 return NULL; 601} 602 603 604// An unresolved member name is a mere symbolic reference. 605// Resolving it plants a vmtarget/vmindex in it, 606// which refers directly to JVM internals. 607Handle MethodHandles::resolve_MemberName(Handle mname, KlassHandle caller, TRAPS) { 608 Handle empty; 609 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 610 611 if (java_lang_invoke_MemberName::vmtarget(mname()) != NULL) { 612 // Already resolved. 613 DEBUG_ONLY(int vmindex = java_lang_invoke_MemberName::vmindex(mname())); 614 assert(vmindex >= Method::nonvirtual_vtable_index, ""); 615 return mname; 616 } 617 618 Handle defc_oop(THREAD, java_lang_invoke_MemberName::clazz(mname())); 619 Handle name_str(THREAD, java_lang_invoke_MemberName::name( mname())); 620 Handle type_str(THREAD, java_lang_invoke_MemberName::type( mname())); 621 int flags = java_lang_invoke_MemberName::flags(mname()); 622 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 623 if (!ref_kind_is_valid(ref_kind)) { 624 THROW_MSG_(vmSymbols::java_lang_InternalError(), "obsolete MemberName format", empty); 625 } 626 627 DEBUG_ONLY(int old_vmindex); 628 assert((old_vmindex = java_lang_invoke_MemberName::vmindex(mname())) == 0, "clean input"); 629 630 if (defc_oop.is_null() || name_str.is_null() || type_str.is_null()) { 631 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), "nothing to resolve", empty); 632 } 633 634 instanceKlassHandle defc; 635 { 636 Klass* defc_klass = java_lang_Class::as_Klass(defc_oop()); 637 if (defc_klass == NULL) return empty; // a primitive; no resolution possible 638 if (!defc_klass->oop_is_instance()) { 639 if (!defc_klass->oop_is_array()) return empty; 640 defc_klass = SystemDictionary::Object_klass(); 641 } 642 defc = instanceKlassHandle(THREAD, defc_klass); 643 } 644 if (defc.is_null()) { 645 THROW_MSG_(vmSymbols::java_lang_InternalError(), "primitive class", empty); 646 } 647 defc->link_class(CHECK_(empty)); // possible safepoint 648 649 // convert the external string name to an internal symbol 650 TempNewSymbol name = java_lang_String::as_symbol_or_null(name_str()); 651 if (name == NULL) return empty; // no such name 652 if (name == vmSymbols::class_initializer_name()) 653 return empty; // illegal name 654 655 vmIntrinsics::ID mh_invoke_id = vmIntrinsics::_none; 656 if ((flags & ALL_KINDS) == IS_METHOD && 657 (defc() == SystemDictionary::MethodHandle_klass()) && 658 (ref_kind == JVM_REF_invokeVirtual || 659 ref_kind == JVM_REF_invokeSpecial || 660 // static invocation mode is required for _linkToVirtual, etc.: 661 ref_kind == JVM_REF_invokeStatic)) { 662 vmIntrinsics::ID iid = signature_polymorphic_name_id(name); 663 if (iid != vmIntrinsics::_none && 664 ((ref_kind == JVM_REF_invokeStatic) == is_signature_polymorphic_static(iid))) { 665 // Virtual methods invoke and invokeExact, plus internal invokers like _invokeBasic. 666 // For a static reference it could an internal linkage routine like _linkToVirtual, etc. 667 mh_invoke_id = iid; 668 } 669 } 670 671 // convert the external string or reflective type to an internal signature 672 TempNewSymbol type = lookup_signature(type_str(), (mh_invoke_id != vmIntrinsics::_none), CHECK_(empty)); 673 if (type == NULL) return empty; // no such signature exists in the VM 674 675 // Time to do the lookup. 676 switch (flags & ALL_KINDS) { 677 case IS_METHOD: 678 { 679 CallInfo result; 680 LinkInfo link_info(defc, name, type, caller, caller.not_null()); 681 { 682 assert(!HAS_PENDING_EXCEPTION, ""); 683 if (ref_kind == JVM_REF_invokeStatic) { 684 LinkResolver::resolve_static_call(result, 685 link_info, false, THREAD); 686 } else if (ref_kind == JVM_REF_invokeInterface) { 687 LinkResolver::resolve_interface_call(result, Handle(), defc, 688 link_info, false, THREAD); 689 } else if (mh_invoke_id != vmIntrinsics::_none) { 690 assert(!is_signature_polymorphic_static(mh_invoke_id), ""); 691 LinkResolver::resolve_handle_call(result, link_info, THREAD); 692 } else if (ref_kind == JVM_REF_invokeSpecial) { 693 LinkResolver::resolve_special_call(result, 694 link_info, THREAD); 695 } else if (ref_kind == JVM_REF_invokeVirtual) { 696 LinkResolver::resolve_virtual_call(result, Handle(), defc, 697 link_info, false, THREAD); 698 } else { 699 assert(false, err_msg("ref_kind=%d", ref_kind)); 700 } 701 if (HAS_PENDING_EXCEPTION) { 702 return empty; 703 } 704 } 705 if (result.resolved_appendix().not_null()) { 706 // The resolved MemberName must not be accompanied by an appendix argument, 707 // since there is no way to bind this value into the MemberName. 708 // Caller is responsible to prevent this from happening. 709 THROW_MSG_(vmSymbols::java_lang_InternalError(), "appendix", empty); 710 } 711 oop mname2 = init_method_MemberName(mname, result); 712 return Handle(THREAD, mname2); 713 } 714 case IS_CONSTRUCTOR: 715 { 716 CallInfo result; 717 LinkInfo link_info(defc, name, type, caller, caller.not_null()); 718 { 719 assert(!HAS_PENDING_EXCEPTION, ""); 720 if (name == vmSymbols::object_initializer_name()) { 721 LinkResolver::resolve_special_call(result, link_info, THREAD); 722 } else { 723 break; // will throw after end of switch 724 } 725 if (HAS_PENDING_EXCEPTION) { 726 return empty; 727 } 728 } 729 assert(result.is_statically_bound(), ""); 730 oop mname2 = init_method_MemberName(mname, result); 731 return Handle(THREAD, mname2); 732 } 733 case IS_FIELD: 734 { 735 fieldDescriptor result; // find_field initializes fd if found 736 { 737 assert(!HAS_PENDING_EXCEPTION, ""); 738 LinkInfo link_info(defc, name, type, caller, /*check_access*/false); 739 LinkResolver::resolve_field(result, link_info, Bytecodes::_nop, false, THREAD); 740 if (HAS_PENDING_EXCEPTION) { 741 return empty; 742 } 743 } 744 oop mname2 = init_field_MemberName(mname, result, ref_kind_is_setter(ref_kind)); 745 return Handle(THREAD, mname2); 746 } 747 default: 748 THROW_MSG_(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format", empty); 749 } 750 751 return empty; 752} 753 754// Conversely, a member name which is only initialized from JVM internals 755// may have null defc, name, and type fields. 756// Resolving it plants a vmtarget/vmindex in it, 757// which refers directly to JVM internals. 758void MethodHandles::expand_MemberName(Handle mname, int suppress, TRAPS) { 759 assert(java_lang_invoke_MemberName::is_instance(mname()), ""); 760 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 761 int vmindex = java_lang_invoke_MemberName::vmindex(mname()); 762 if (vmtarget == NULL) { 763 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), "nothing to expand"); 764 } 765 766 bool have_defc = (java_lang_invoke_MemberName::clazz(mname()) != NULL); 767 bool have_name = (java_lang_invoke_MemberName::name(mname()) != NULL); 768 bool have_type = (java_lang_invoke_MemberName::type(mname()) != NULL); 769 int flags = java_lang_invoke_MemberName::flags(mname()); 770 771 if (suppress != 0) { 772 if (suppress & _suppress_defc) have_defc = true; 773 if (suppress & _suppress_name) have_name = true; 774 if (suppress & _suppress_type) have_type = true; 775 } 776 777 if (have_defc && have_name && have_type) return; // nothing needed 778 779 switch (flags & ALL_KINDS) { 780 case IS_METHOD: 781 case IS_CONSTRUCTOR: 782 { 783 assert(vmtarget->is_method(), "method or constructor vmtarget is Method*"); 784 methodHandle m(THREAD, (Method*)vmtarget); 785 DEBUG_ONLY(vmtarget = NULL); // safety 786 if (m.is_null()) break; 787 if (!have_defc) { 788 InstanceKlass* defc = m->method_holder(); 789 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 790 } 791 if (!have_name) { 792 //not java_lang_String::create_from_symbol; let's intern member names 793 Handle name = StringTable::intern(m->name(), CHECK); 794 java_lang_invoke_MemberName::set_name(mname(), name()); 795 } 796 if (!have_type) { 797 Handle type = java_lang_String::create_from_symbol(m->signature(), CHECK); 798 java_lang_invoke_MemberName::set_type(mname(), type()); 799 } 800 return; 801 } 802 case IS_FIELD: 803 { 804 assert(vmtarget->is_klass(), "field vmtarget is Klass*"); 805 if (!((Klass*) vmtarget)->oop_is_instance()) break; 806 instanceKlassHandle defc(THREAD, (Klass*) vmtarget); 807 DEBUG_ONLY(vmtarget = NULL); // safety 808 bool is_static = ((flags & JVM_ACC_STATIC) != 0); 809 fieldDescriptor fd; // find_field initializes fd if found 810 if (!defc->find_field_from_offset(vmindex, is_static, &fd)) 811 break; // cannot expand 812 if (!have_defc) { 813 java_lang_invoke_MemberName::set_clazz(mname(), defc->java_mirror()); 814 } 815 if (!have_name) { 816 //not java_lang_String::create_from_symbol; let's intern member names 817 Handle name = StringTable::intern(fd.name(), CHECK); 818 java_lang_invoke_MemberName::set_name(mname(), name()); 819 } 820 if (!have_type) { 821 // If it is a primitive field type, don't mess with short strings like "I". 822 Handle type = field_signature_type_or_null(fd.signature()); 823 if (type.is_null()) { 824 java_lang_String::create_from_symbol(fd.signature(), CHECK); 825 } 826 java_lang_invoke_MemberName::set_type(mname(), type()); 827 } 828 return; 829 } 830 } 831 THROW_MSG(vmSymbols::java_lang_InternalError(), "unrecognized MemberName format"); 832} 833 834int MethodHandles::find_MemberNames(KlassHandle k, 835 Symbol* name, Symbol* sig, 836 int mflags, KlassHandle caller, 837 int skip, objArrayHandle results) { 838 // %%% take caller into account! 839 840 Thread* thread = Thread::current(); 841 842 if (k.is_null() || !k->oop_is_instance()) return -1; 843 844 int rfill = 0, rlimit = results->length(), rskip = skip; 845 // overflow measurement: 846 int overflow = 0, overflow_limit = MAX2(1000, rlimit); 847 848 int match_flags = mflags; 849 bool search_superc = ((match_flags & SEARCH_SUPERCLASSES) != 0); 850 bool search_intfc = ((match_flags & SEARCH_INTERFACES) != 0); 851 bool local_only = !(search_superc | search_intfc); 852 bool classes_only = false; 853 854 if (name != NULL) { 855 if (name->utf8_length() == 0) return 0; // a match is not possible 856 } 857 if (sig != NULL) { 858 if (sig->utf8_length() == 0) return 0; // a match is not possible 859 if (sig->byte_at(0) == '(') 860 match_flags &= ~(IS_FIELD | IS_TYPE); 861 else 862 match_flags &= ~(IS_CONSTRUCTOR | IS_METHOD); 863 } 864 865 if ((match_flags & IS_TYPE) != 0) { 866 // NYI, and Core Reflection works quite well for this query 867 } 868 869 if ((match_flags & IS_FIELD) != 0) { 870 for (FieldStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 871 if (name != NULL && st.name() != name) 872 continue; 873 if (sig != NULL && st.signature() != sig) 874 continue; 875 // passed the filters 876 if (rskip > 0) { 877 --rskip; 878 } else if (rfill < rlimit) { 879 Handle result(thread, results->obj_at(rfill++)); 880 if (!java_lang_invoke_MemberName::is_instance(result())) 881 return -99; // caller bug! 882 oop saved = MethodHandles::init_field_MemberName(result, st.field_descriptor()); 883 if (saved != result()) 884 results->obj_at_put(rfill-1, saved); // show saved instance to user 885 } else if (++overflow >= overflow_limit) { 886 match_flags = 0; break; // got tired of looking at overflow 887 } 888 } 889 } 890 891 if ((match_flags & (IS_METHOD | IS_CONSTRUCTOR)) != 0) { 892 // watch out for these guys: 893 Symbol* init_name = vmSymbols::object_initializer_name(); 894 Symbol* clinit_name = vmSymbols::class_initializer_name(); 895 if (name == clinit_name) clinit_name = NULL; // hack for exposing <clinit> 896 bool negate_name_test = false; 897 // fix name so that it captures the intention of IS_CONSTRUCTOR 898 if (!(match_flags & IS_METHOD)) { 899 // constructors only 900 if (name == NULL) { 901 name = init_name; 902 } else if (name != init_name) { 903 return 0; // no constructors of this method name 904 } 905 } else if (!(match_flags & IS_CONSTRUCTOR)) { 906 // methods only 907 if (name == NULL) { 908 name = init_name; 909 negate_name_test = true; // if we see the name, we *omit* the entry 910 } else if (name == init_name) { 911 return 0; // no methods of this constructor name 912 } 913 } else { 914 // caller will accept either sort; no need to adjust name 915 } 916 for (MethodStream st(k(), local_only, !search_intfc); !st.eos(); st.next()) { 917 Method* m = st.method(); 918 Symbol* m_name = m->name(); 919 if (m_name == clinit_name) 920 continue; 921 if (name != NULL && ((m_name != name) ^ negate_name_test)) 922 continue; 923 if (sig != NULL && m->signature() != sig) 924 continue; 925 // passed the filters 926 if (rskip > 0) { 927 --rskip; 928 } else if (rfill < rlimit) { 929 Handle result(thread, results->obj_at(rfill++)); 930 if (!java_lang_invoke_MemberName::is_instance(result())) 931 return -99; // caller bug! 932 CallInfo info(m); 933 oop saved = MethodHandles::init_method_MemberName(result, info); 934 if (saved != result()) 935 results->obj_at_put(rfill-1, saved); // show saved instance to user 936 } else if (++overflow >= overflow_limit) { 937 match_flags = 0; break; // got tired of looking at overflow 938 } 939 } 940 } 941 942 // return number of elements we at leasted wanted to initialize 943 return rfill + overflow; 944} 945 946void MethodHandles::add_dependent_nmethod(oop call_site, nmethod* nm) { 947 assert_locked_or_safepoint(CodeCache_lock); 948 949 oop context = java_lang_invoke_CallSite::context(call_site); 950 nmethodBucket* deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 951 952 nmethodBucket* new_deps = nmethodBucket::add_dependent_nmethod(deps, nm); 953 if (deps != new_deps) { 954 java_lang_invoke_MethodHandleNatives_CallSiteContext::set_vmdependencies(context, new_deps); 955 } 956} 957 958void MethodHandles::remove_dependent_nmethod(oop call_site, nmethod* nm) { 959 assert_locked_or_safepoint(CodeCache_lock); 960 961 oop context = java_lang_invoke_CallSite::context(call_site); 962 nmethodBucket* deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 963 964 if (nmethodBucket::remove_dependent_nmethod(deps, nm)) { 965 nmethodBucket* new_deps = nmethodBucket::clean_dependent_nmethods(deps); 966 if (deps != new_deps) { 967 java_lang_invoke_MethodHandleNatives_CallSiteContext::set_vmdependencies(context, new_deps); 968 } 969 } 970} 971 972void MethodHandles::flush_dependent_nmethods(Handle call_site, Handle target) { 973 assert_lock_strong(Compile_lock); 974 975 int marked = 0; 976 CallSiteDepChange changes(call_site(), target()); 977 { 978 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 979 980 oop context = java_lang_invoke_CallSite::context(call_site()); 981 nmethodBucket* deps = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context); 982 983 marked = nmethodBucket::mark_dependent_nmethods(deps, changes); 984 if (marked > 0) { 985 nmethodBucket* new_deps = nmethodBucket::clean_dependent_nmethods(deps); 986 if (deps != new_deps) { 987 java_lang_invoke_MethodHandleNatives_CallSiteContext::set_vmdependencies(context, new_deps); 988 } 989 } 990 } 991 if (marked > 0) { 992 // At least one nmethod has been marked for deoptimization 993 VM_Deoptimize op; 994 VMThread::execute(&op); 995 } 996} 997 998//------------------------------------------------------------------------------ 999// MemberNameTable 1000// 1001 1002MemberNameTable::MemberNameTable(int methods_cnt) 1003 : GrowableArray<jweak>(methods_cnt, true) { 1004 assert_locked_or_safepoint(MemberNameTable_lock); 1005} 1006 1007MemberNameTable::~MemberNameTable() { 1008 assert_locked_or_safepoint(MemberNameTable_lock); 1009 int len = this->length(); 1010 1011 for (int idx = 0; idx < len; idx++) { 1012 jweak ref = this->at(idx); 1013 JNIHandles::destroy_weak_global(ref); 1014 } 1015} 1016 1017void MemberNameTable::add_member_name(jweak mem_name_wref) { 1018 assert_locked_or_safepoint(MemberNameTable_lock); 1019 this->push(mem_name_wref); 1020} 1021 1022#if INCLUDE_JVMTI 1023// It is called at safepoint only for RedefineClasses 1024void MemberNameTable::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) { 1025 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint"); 1026 // For each redefined method 1027 for (int idx = 0; idx < length(); idx++) { 1028 oop mem_name = JNIHandles::resolve(this->at(idx)); 1029 if (mem_name == NULL) { 1030 continue; 1031 } 1032 Method* old_method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name); 1033 1034 if (old_method == NULL || !old_method->is_old()) { 1035 continue; // skip uninteresting entries 1036 } 1037 if (old_method->is_deleted()) { 1038 // skip entries with deleted methods 1039 continue; 1040 } 1041 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); 1042 1043 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 1044 assert(old_method != new_method, "sanity check"); 1045 1046 java_lang_invoke_MemberName::set_vmtarget(mem_name, new_method); 1047 1048 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 1049 if (!(*trace_name_printed)) { 1050 // RC_TRACE_MESG macro has an embedded ResourceMark 1051 RC_TRACE_MESG(("adjust: name=%s", 1052 old_method->method_holder()->external_name())); 1053 *trace_name_printed = true; 1054 } 1055 // RC_TRACE macro has an embedded ResourceMark 1056 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)", 1057 new_method->name()->as_C_string(), 1058 new_method->signature()->as_C_string())); 1059 } 1060 } 1061} 1062#endif // INCLUDE_JVMTI 1063 1064// 1065// Here are the native methods in java.lang.invoke.MethodHandleNatives 1066// They are the private interface between this JVM and the HotSpot-specific 1067// Java code that implements JSR 292 method handles. 1068// 1069// Note: We use a JVM_ENTRY macro to define each of these, for this is the way 1070// that intrinsic (non-JNI) native methods are defined in HotSpot. 1071// 1072 1073#ifndef PRODUCT 1074#define EACH_NAMED_CON(template, requirement) \ 1075 template(java_lang_invoke_MemberName,MN_IS_METHOD) \ 1076 template(java_lang_invoke_MemberName,MN_IS_CONSTRUCTOR) \ 1077 template(java_lang_invoke_MemberName,MN_IS_FIELD) \ 1078 template(java_lang_invoke_MemberName,MN_IS_TYPE) \ 1079 template(java_lang_invoke_MemberName,MN_CALLER_SENSITIVE) \ 1080 template(java_lang_invoke_MemberName,MN_SEARCH_SUPERCLASSES) \ 1081 template(java_lang_invoke_MemberName,MN_SEARCH_INTERFACES) \ 1082 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_SHIFT) \ 1083 template(java_lang_invoke_MemberName,MN_REFERENCE_KIND_MASK) \ 1084 /*end*/ 1085 1086#define IGNORE_REQ(req_expr) /* req_expr */ 1087#define ONE_PLUS(scope,value) 1+ 1088static const int con_value_count = EACH_NAMED_CON(ONE_PLUS, IGNORE_REQ) 0; 1089#define VALUE_COMMA(scope,value) scope::value, 1090static const int con_values[con_value_count+1] = { EACH_NAMED_CON(VALUE_COMMA, IGNORE_REQ) 0 }; 1091#define STRING_NULL(scope,value) #value "\0" 1092static const char con_names[] = { EACH_NAMED_CON(STRING_NULL, IGNORE_REQ) }; 1093 1094static bool advertise_con_value(int which) { 1095 if (which < 0) return false; 1096 bool ok = true; 1097 int count = 0; 1098#define INC_COUNT(scope,value) \ 1099 ++count; 1100#define CHECK_REQ(req_expr) \ 1101 if (which < count) return ok; \ 1102 ok = (req_expr); 1103 EACH_NAMED_CON(INC_COUNT, CHECK_REQ); 1104#undef INC_COUNT 1105#undef CHECK_REQ 1106 assert(count == con_value_count, ""); 1107 if (which < count) return ok; 1108 return false; 1109} 1110 1111#undef ONE_PLUS 1112#undef VALUE_COMMA 1113#undef STRING_NULL 1114#undef EACH_NAMED_CON 1115#endif // PRODUCT 1116 1117JVM_ENTRY(jint, MHN_getNamedCon(JNIEnv *env, jobject igcls, jint which, jobjectArray box_jh)) { 1118#ifndef PRODUCT 1119 if (advertise_con_value(which)) { 1120 assert(which >= 0 && which < con_value_count, ""); 1121 int con = con_values[which]; 1122 objArrayHandle box(THREAD, (objArrayOop) JNIHandles::resolve(box_jh)); 1123 if (box.not_null() && box->klass() == Universe::objectArrayKlassObj() && box->length() > 0) { 1124 const char* str = &con_names[0]; 1125 for (int i = 0; i < which; i++) 1126 str += strlen(str) + 1; // skip name and null 1127 oop name = java_lang_String::create_oop_from_str(str, CHECK_0); // possible safepoint 1128 box->obj_at_put(0, name); 1129 } 1130 return con; 1131 } 1132#endif 1133 return 0; 1134} 1135JVM_END 1136 1137// void init(MemberName self, AccessibleObject ref) 1138JVM_ENTRY(void, MHN_init_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jobject target_jh)) { 1139 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1140 if (target_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "target is null"); } 1141 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1142 Handle target(THREAD, JNIHandles::resolve_non_null(target_jh)); 1143 MethodHandles::init_MemberName(mname, target); 1144} 1145JVM_END 1146 1147// void expand(MemberName self) 1148JVM_ENTRY(void, MHN_expand_Mem(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1149 if (mname_jh == NULL) { THROW_MSG(vmSymbols::java_lang_InternalError(), "mname is null"); } 1150 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1151 MethodHandles::expand_MemberName(mname, 0, CHECK); 1152} 1153JVM_END 1154 1155// void resolve(MemberName self, Class<?> caller) 1156JVM_ENTRY(jobject, MHN_resolve_Mem(JNIEnv *env, jobject igcls, jobject mname_jh, jclass caller_jh)) { 1157 if (mname_jh == NULL) { THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "mname is null"); } 1158 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1159 1160 // The trusted Java code that calls this method should already have performed 1161 // access checks on behalf of the given caller. But, we can verify this. 1162 if (VerifyMethodHandles && caller_jh != NULL && 1163 java_lang_invoke_MemberName::clazz(mname()) != NULL) { 1164 Klass* reference_klass = java_lang_Class::as_Klass(java_lang_invoke_MemberName::clazz(mname())); 1165 if (reference_klass != NULL && reference_klass->oop_is_objArray()) { 1166 reference_klass = ObjArrayKlass::cast(reference_klass)->bottom_klass(); 1167 } 1168 1169 // Reflection::verify_class_access can only handle instance classes. 1170 if (reference_klass != NULL && reference_klass->oop_is_instance()) { 1171 // Emulate LinkResolver::check_klass_accessability. 1172 Klass* caller = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh)); 1173 if (!Reflection::verify_class_access(caller, 1174 reference_klass, 1175 true)) { 1176 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), reference_klass->external_name()); 1177 } 1178 } 1179 } 1180 1181 KlassHandle caller(THREAD, 1182 caller_jh == NULL ? (Klass*) NULL : 1183 java_lang_Class::as_Klass(JNIHandles::resolve_non_null(caller_jh))); 1184 Handle resolved = MethodHandles::resolve_MemberName(mname, caller, CHECK_NULL); 1185 1186 if (resolved.is_null()) { 1187 int flags = java_lang_invoke_MemberName::flags(mname()); 1188 int ref_kind = (flags >> REFERENCE_KIND_SHIFT) & REFERENCE_KIND_MASK; 1189 if (!MethodHandles::ref_kind_is_valid(ref_kind)) { 1190 THROW_MSG_NULL(vmSymbols::java_lang_InternalError(), "obsolete MemberName format"); 1191 } 1192 if ((flags & ALL_KINDS) == IS_FIELD) { 1193 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchMethodError(), "field resolution failed"); 1194 } else if ((flags & ALL_KINDS) == IS_METHOD || 1195 (flags & ALL_KINDS) == IS_CONSTRUCTOR) { 1196 THROW_MSG_NULL(vmSymbols::java_lang_NoSuchFieldError(), "method resolution failed"); 1197 } else { 1198 THROW_MSG_NULL(vmSymbols::java_lang_LinkageError(), "resolution failed"); 1199 } 1200 } 1201 1202 return JNIHandles::make_local(THREAD, resolved()); 1203} 1204JVM_END 1205 1206static jlong find_member_field_offset(oop mname, bool must_be_static, TRAPS) { 1207 if (mname == NULL || 1208 java_lang_invoke_MemberName::vmtarget(mname) == NULL) { 1209 THROW_MSG_0(vmSymbols::java_lang_InternalError(), "mname not resolved"); 1210 } else { 1211 int flags = java_lang_invoke_MemberName::flags(mname); 1212 if ((flags & IS_FIELD) != 0 && 1213 (must_be_static 1214 ? (flags & JVM_ACC_STATIC) != 0 1215 : (flags & JVM_ACC_STATIC) == 0)) { 1216 int vmindex = java_lang_invoke_MemberName::vmindex(mname); 1217 return (jlong) vmindex; 1218 } 1219 } 1220 const char* msg = (must_be_static ? "static field required" : "non-static field required"); 1221 THROW_MSG_0(vmSymbols::java_lang_InternalError(), msg); 1222 return 0; 1223} 1224 1225JVM_ENTRY(jlong, MHN_objectFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1226 return find_member_field_offset(JNIHandles::resolve(mname_jh), false, THREAD); 1227} 1228JVM_END 1229 1230JVM_ENTRY(jlong, MHN_staticFieldOffset(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1231 return find_member_field_offset(JNIHandles::resolve(mname_jh), true, THREAD); 1232} 1233JVM_END 1234 1235JVM_ENTRY(jobject, MHN_staticFieldBase(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1236 // use the other function to perform sanity checks: 1237 jlong ignore = find_member_field_offset(JNIHandles::resolve(mname_jh), true, CHECK_NULL); 1238 oop clazz = java_lang_invoke_MemberName::clazz(JNIHandles::resolve_non_null(mname_jh)); 1239 return JNIHandles::make_local(THREAD, clazz); 1240} 1241JVM_END 1242 1243JVM_ENTRY(jobject, MHN_getMemberVMInfo(JNIEnv *env, jobject igcls, jobject mname_jh)) { 1244 if (mname_jh == NULL) return NULL; 1245 Handle mname(THREAD, JNIHandles::resolve_non_null(mname_jh)); 1246 intptr_t vmindex = java_lang_invoke_MemberName::vmindex(mname()); 1247 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(mname()); 1248 objArrayHandle result = oopFactory::new_objArray(SystemDictionary::Object_klass(), 2, CHECK_NULL); 1249 jvalue vmindex_value; vmindex_value.j = (long)vmindex; 1250 oop x = java_lang_boxing_object::create(T_LONG, &vmindex_value, CHECK_NULL); 1251 result->obj_at_put(0, x); 1252 x = NULL; 1253 if (vmtarget == NULL) { 1254 x = NULL; 1255 } else if (vmtarget->is_klass()) { 1256 x = ((Klass*) vmtarget)->java_mirror(); 1257 } else if (vmtarget->is_method()) { 1258 x = mname(); 1259 } 1260 result->obj_at_put(1, x); 1261 return JNIHandles::make_local(env, result()); 1262} 1263JVM_END 1264 1265 1266 1267// static native int getMembers(Class<?> defc, String matchName, String matchSig, 1268// int matchFlags, Class<?> caller, int skip, MemberName[] results); 1269JVM_ENTRY(jint, MHN_getMembers(JNIEnv *env, jobject igcls, 1270 jclass clazz_jh, jstring name_jh, jstring sig_jh, 1271 int mflags, jclass caller_jh, jint skip, jobjectArray results_jh)) { 1272 if (clazz_jh == NULL || results_jh == NULL) return -1; 1273 KlassHandle k(THREAD, java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz_jh))); 1274 1275 objArrayHandle results(THREAD, (objArrayOop) JNIHandles::resolve(results_jh)); 1276 if (results.is_null() || !results->is_objArray()) return -1; 1277 1278 TempNewSymbol name = NULL; 1279 TempNewSymbol sig = NULL; 1280 if (name_jh != NULL) { 1281 name = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(name_jh)); 1282 if (name == NULL) return 0; // a match is not possible 1283 } 1284 if (sig_jh != NULL) { 1285 sig = java_lang_String::as_symbol_or_null(JNIHandles::resolve_non_null(sig_jh)); 1286 if (sig == NULL) return 0; // a match is not possible 1287 } 1288 1289 KlassHandle caller; 1290 if (caller_jh != NULL) { 1291 oop caller_oop = JNIHandles::resolve_non_null(caller_jh); 1292 if (!java_lang_Class::is_instance(caller_oop)) return -1; 1293 caller = KlassHandle(THREAD, java_lang_Class::as_Klass(caller_oop)); 1294 } 1295 1296 if (name != NULL && sig != NULL && results.not_null()) { 1297 // try a direct resolve 1298 // %%% TO DO 1299 } 1300 1301 int res = MethodHandles::find_MemberNames(k, name, sig, mflags, 1302 caller, skip, results); 1303 // TO DO: expand at least some of the MemberNames, to avoid massive callbacks 1304 return res; 1305} 1306JVM_END 1307 1308JVM_ENTRY(void, MHN_setCallSiteTargetNormal(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1309 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1310 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1311 { 1312 // Walk all nmethods depending on this call site. 1313 MutexLocker mu(Compile_lock, thread); 1314 MethodHandles::flush_dependent_nmethods(call_site, target); 1315 java_lang_invoke_CallSite::set_target(call_site(), target()); 1316 } 1317} 1318JVM_END 1319 1320JVM_ENTRY(void, MHN_setCallSiteTargetVolatile(JNIEnv* env, jobject igcls, jobject call_site_jh, jobject target_jh)) { 1321 Handle call_site(THREAD, JNIHandles::resolve_non_null(call_site_jh)); 1322 Handle target (THREAD, JNIHandles::resolve_non_null(target_jh)); 1323 { 1324 // Walk all nmethods depending on this call site. 1325 MutexLocker mu(Compile_lock, thread); 1326 MethodHandles::flush_dependent_nmethods(call_site, target); 1327 java_lang_invoke_CallSite::set_target_volatile(call_site(), target()); 1328 } 1329} 1330JVM_END 1331 1332JVM_ENTRY(void, MHN_clearCallSiteContext(JNIEnv* env, jobject igcls, jobject context_jh)) { 1333 Handle context(THREAD, JNIHandles::resolve_non_null(context_jh)); 1334 { 1335 // Walk all nmethods depending on this call site. 1336 MutexLocker mu1(Compile_lock, thread); 1337 1338 int marked = 0; 1339 { 1340 MutexLockerEx mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1341 nmethodBucket* b = java_lang_invoke_MethodHandleNatives_CallSiteContext::vmdependencies(context()); 1342 while(b != NULL) { 1343 nmethod* nm = b->get_nmethod(); 1344 if (b->count() > 0 && nm->is_alive() && !nm->is_marked_for_deoptimization()) { 1345 nm->mark_for_deoptimization(); 1346 marked++; 1347 } 1348 nmethodBucket* next = b->next(); 1349 delete b; 1350 b = next; 1351 } 1352 java_lang_invoke_MethodHandleNatives_CallSiteContext::set_vmdependencies(context(), NULL); // reset context 1353 } 1354 if (marked > 0) { 1355 // At least one nmethod has been marked for deoptimization 1356 VM_Deoptimize op; 1357 VMThread::execute(&op); 1358 } 1359 } 1360} 1361JVM_END 1362 1363/** 1364 * Throws a java/lang/UnsupportedOperationException unconditionally. 1365 * This is required by the specification of MethodHandle.invoke if 1366 * invoked directly. 1367 */ 1368JVM_ENTRY(jobject, MH_invoke_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1369 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invoke cannot be invoked reflectively"); 1370 return NULL; 1371} 1372JVM_END 1373 1374/** 1375 * Throws a java/lang/UnsupportedOperationException unconditionally. 1376 * This is required by the specification of MethodHandle.invokeExact if 1377 * invoked directly. 1378 */ 1379JVM_ENTRY(jobject, MH_invokeExact_UOE(JNIEnv* env, jobject mh, jobjectArray args)) { 1380 THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "MethodHandle.invokeExact cannot be invoked reflectively"); 1381 return NULL; 1382} 1383JVM_END 1384 1385/// JVM_RegisterMethodHandleMethods 1386 1387#undef CS // Solaris builds complain 1388 1389#define LANG "Ljava/lang/" 1390#define JLINV "Ljava/lang/invoke/" 1391 1392#define OBJ LANG "Object;" 1393#define CLS LANG "Class;" 1394#define STRG LANG "String;" 1395#define CS JLINV "CallSite;" 1396#define MT JLINV "MethodType;" 1397#define MH JLINV "MethodHandle;" 1398#define MEM JLINV "MemberName;" 1399#define CTX JLINV "MethodHandleNatives$CallSiteContext;" 1400 1401#define CC (char*) /*cast a literal from (const char*)*/ 1402#define FN_PTR(f) CAST_FROM_FN_PTR(void*, &f) 1403 1404// These are the native methods on java.lang.invoke.MethodHandleNatives. 1405static JNINativeMethod MHN_methods[] = { 1406 {CC "init", CC "(" MEM "" OBJ ")V", FN_PTR(MHN_init_Mem)}, 1407 {CC "expand", CC "(" MEM ")V", FN_PTR(MHN_expand_Mem)}, 1408 {CC "resolve", CC "(" MEM "" CLS ")" MEM, FN_PTR(MHN_resolve_Mem)}, 1409 // static native int getNamedCon(int which, Object[] name) 1410 {CC "getNamedCon", CC "(I[" OBJ ")I", FN_PTR(MHN_getNamedCon)}, 1411 // static native int getMembers(Class<?> defc, String matchName, String matchSig, 1412 // int matchFlags, Class<?> caller, int skip, MemberName[] results); 1413 {CC "getMembers", CC "(" CLS "" STRG "" STRG "I" CLS "I[" MEM ")I", FN_PTR(MHN_getMembers)}, 1414 {CC "objectFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_objectFieldOffset)}, 1415 {CC "setCallSiteTargetNormal", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetNormal)}, 1416 {CC "setCallSiteTargetVolatile", CC "(" CS "" MH ")V", FN_PTR(MHN_setCallSiteTargetVolatile)}, 1417 {CC "clearCallSiteContext", CC "(" CTX ")V", FN_PTR(MHN_clearCallSiteContext)}, 1418 {CC "staticFieldOffset", CC "(" MEM ")J", FN_PTR(MHN_staticFieldOffset)}, 1419 {CC "staticFieldBase", CC "(" MEM ")" OBJ, FN_PTR(MHN_staticFieldBase)}, 1420 {CC "getMemberVMInfo", CC "(" MEM ")" OBJ, FN_PTR(MHN_getMemberVMInfo)} 1421}; 1422 1423static JNINativeMethod MH_methods[] = { 1424 // UnsupportedOperationException throwers 1425 {CC "invoke", CC "([" OBJ ")" OBJ, FN_PTR(MH_invoke_UOE)}, 1426 {CC "invokeExact", CC "([" OBJ ")" OBJ, FN_PTR(MH_invokeExact_UOE)} 1427}; 1428 1429/** 1430 * Helper method to register native methods. 1431 */ 1432static bool register_natives(JNIEnv* env, jclass clazz, const JNINativeMethod* methods, jint nMethods) { 1433 int status = env->RegisterNatives(clazz, methods, nMethods); 1434 if (status != JNI_OK || env->ExceptionOccurred()) { 1435 warning("JSR 292 method handle code is mismatched to this JVM. Disabling support."); 1436 env->ExceptionClear(); 1437 return false; 1438 } 1439 return true; 1440} 1441 1442/** 1443 * This one function is exported, used by NativeLookup. 1444 */ 1445JVM_ENTRY(void, JVM_RegisterMethodHandleMethods(JNIEnv *env, jclass MHN_class)) { 1446 assert(!MethodHandles::enabled(), "must not be enabled"); 1447 bool enable_MH = true; 1448 1449 jclass MH_class = NULL; 1450 if (SystemDictionary::MethodHandle_klass() == NULL) { 1451 enable_MH = false; 1452 } else { 1453 oop mirror = SystemDictionary::MethodHandle_klass()->java_mirror(); 1454 MH_class = (jclass) JNIHandles::make_local(env, mirror); 1455 } 1456 1457 if (enable_MH) { 1458 ThreadToNativeFromVM ttnfv(thread); 1459 1460 if (enable_MH) { 1461 enable_MH = register_natives(env, MHN_class, MHN_methods, sizeof(MHN_methods)/sizeof(JNINativeMethod)); 1462 } 1463 if (enable_MH) { 1464 enable_MH = register_natives(env, MH_class, MH_methods, sizeof(MH_methods)/sizeof(JNINativeMethod)); 1465 } 1466 } 1467 1468 if (TraceInvokeDynamic) { 1469 tty->print_cr("MethodHandle support loaded (using LambdaForms)"); 1470 } 1471 1472 if (enable_MH) { 1473 if (MethodHandles::generate_adapters() == false) { 1474 THROW_MSG(vmSymbols::java_lang_VirtualMachineError(), "Out of space in CodeCache for method handle adapters"); 1475 } 1476 MethodHandles::set_enabled(true); 1477 } 1478} 1479JVM_END 1480