1 /* 2 * Copyright (c) 1998, 2013, 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 "gc_implementation/shared/markSweep.inline.hpp" 27 #include "interpreter/interpreter.hpp" 28 #include "interpreter/rewriter.hpp" 29 #include "memory/universe.inline.hpp" 30 #include "oops/cpCache.hpp" 31 #include "oops/objArrayOop.hpp" 32 #include "oops/oop.inline.hpp" 33 #include "prims/jvmtiRedefineClassesTrace.hpp" 34 #include "prims/methodHandles.hpp" 35 #include "runtime/handles.inline.hpp" 36 #include "utilities/macros.hpp" 37 #if INCLUDE_ALL_GCS 38 # include "gc_implementation/parallelScavenge/psPromotionManager.hpp" 39 #endif // INCLUDE_ALL_GCS 40 41 42 // Implememtation of ConstantPoolCacheEntry 43 44 void ConstantPoolCacheEntry::initialize_entry(int index) { 45 assert(0 < index && index < 0x10000, "sanity check"); 46 _indices = index; 47 _f1 = NULL; 48 _f2 = _flags = 0; 49 assert(constant_pool_index() == index, ""); 50 } 51 52 int ConstantPoolCacheEntry::make_flags(TosState state, 53 int option_bits, 54 int field_index_or_method_params) { 55 assert(state < number_of_states, "Invalid state in make_flags"); 56 int f = ((int)state << tos_state_shift) | option_bits | field_index_or_method_params; 57 // Preserve existing flag bit values 58 // The low bits are a field offset, or else the method parameter size. 59 #ifdef ASSERT 60 TosState old_state = flag_state(); 61 assert(old_state == (TosState)0 || old_state == state, 62 "inconsistent cpCache flags state"); 63 #endif 64 return (_flags | f) ; 65 } 66 67 void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) { 68 #ifdef ASSERT 69 // Read once. 70 volatile Bytecodes::Code c = bytecode_1(); 71 assert(c == 0 || c == code || code == 0, "update must be consistent"); 72 #endif 73 // Need to flush pending stores here before bytecode is written. 74 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_1_shift)); 75 } 76 77 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) { 78 #ifdef ASSERT 79 // Read once. 80 volatile Bytecodes::Code c = bytecode_2(); 81 assert(c == 0 || c == code || code == 0, "update must be consistent"); 82 #endif 83 // Need to flush pending stores here before bytecode is written. 84 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_2_shift)); 85 } 86 87 // Sets f1, ordering with previous writes. 88 void ConstantPoolCacheEntry::release_set_f1(Metadata* f1) { 89 assert(f1 != NULL, ""); 90 OrderAccess::release_store_ptr((HeapWord*) &_f1, f1); 91 } 92 93 // Sets flags, but only if the value was previously zero. 94 bool ConstantPoolCacheEntry::init_flags_atomic(intptr_t flags) { 95 intptr_t result = Atomic::cmpxchg_ptr(flags, &_flags, 0); 96 return (result == 0); 97 } 98 99 // Note that concurrent update of both bytecodes can leave one of them 100 // reset to zero. This is harmless; the interpreter will simply re-resolve 101 // the damaged entry. More seriously, the memory synchronization is needed 102 // to flush other fields (f1, f2) completely to memory before the bytecodes 103 // are updated, lest other processors see a non-zero bytecode but zero f1/f2. 104 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code, 105 Bytecodes::Code put_code, 106 KlassHandle field_holder, 107 int field_index, 108 int field_offset, 109 TosState field_type, 110 bool is_final, 111 bool is_volatile, 112 Klass* root_klass) { 113 set_f1(field_holder()); 114 set_f2(field_offset); 115 assert((field_index & field_index_mask) == field_index, 116 "field index does not fit in low flag bits"); 117 set_field_flags(field_type, 118 ((is_volatile ? 1 : 0) << is_volatile_shift) | 119 ((is_final ? 1 : 0) << is_final_shift), 120 field_index); 121 set_bytecode_1(get_code); 122 set_bytecode_2(put_code); 123 NOT_PRODUCT(verify(tty)); 124 } 125 126 void ConstantPoolCacheEntry::set_parameter_size(int value) { 127 // This routine is called only in corner cases where the CPCE is not yet initialized. 128 // See AbstractInterpreter::deopt_continue_after_entry. 129 assert(_flags == 0 || parameter_size() == 0 || parameter_size() == value, 130 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value)); 131 // Setting the parameter size by itself is only safe if the 132 // current value of _flags is 0, otherwise another thread may have 133 // updated it and we don't want to overwrite that value. Don't 134 // bother trying to update it once it's nonzero but always make 135 // sure that the final parameter size agrees with what was passed. 136 if (_flags == 0) { 137 Atomic::cmpxchg_ptr((value & parameter_size_mask), &_flags, 0); 138 } 139 guarantee(parameter_size() == value, 140 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value)); 141 } 142 143 void ConstantPoolCacheEntry::set_direct_or_vtable_call(Bytecodes::Code invoke_code, 144 methodHandle method, 145 int vtable_index) { 146 bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean 147 assert(method->interpreter_entry() != NULL, "should have been set at this point"); 148 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache"); 149 150 int byte_no = -1; 151 bool change_to_virtual = false; 152 153 switch (invoke_code) { 154 case Bytecodes::_invokeinterface: 155 // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface 156 // instruction somehow links to a non-interface method (in Object). 157 // In that case, the method has no itable index and must be invoked as a virtual. 158 // Set a flag to keep track of this corner case. 159 change_to_virtual = true; 160 161 // ...and fall through as if we were handling invokevirtual: 162 case Bytecodes::_invokevirtual: 163 { 164 if (!is_vtable_call) { 165 assert(method->can_be_statically_bound(), ""); 166 // set_f2_as_vfinal_method checks if is_vfinal flag is true. 167 set_method_flags(as_TosState(method->result_type()), 168 ( 1 << is_vfinal_shift) | 169 ((method->is_final_method() ? 1 : 0) << is_final_shift) | 170 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift), 171 method()->size_of_parameters()); 172 set_f2_as_vfinal_method(method()); 173 } else { 174 assert(!method->can_be_statically_bound(), ""); 175 assert(vtable_index >= 0, "valid index"); 176 assert(!method->is_final_method(), "sanity"); 177 set_method_flags(as_TosState(method->result_type()), 178 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift), 179 method()->size_of_parameters()); 180 set_f2(vtable_index); 181 } 182 byte_no = 2; 183 break; 184 } 185 186 case Bytecodes::_invokespecial: 187 case Bytecodes::_invokestatic: 188 assert(!is_vtable_call, ""); 189 // Note: Read and preserve the value of the is_vfinal flag on any 190 // invokevirtual bytecode shared with this constant pool cache entry. 191 // It is cheap and safe to consult is_vfinal() at all times. 192 // Once is_vfinal is set, it must stay that way, lest we get a dangling oop. 193 set_method_flags(as_TosState(method->result_type()), 194 ((is_vfinal() ? 1 : 0) << is_vfinal_shift) | 195 ((method->is_final_method() ? 1 : 0) << is_final_shift), 196 method()->size_of_parameters()); 197 set_f1(method()); 198 byte_no = 1; 199 break; 200 default: 201 ShouldNotReachHere(); 202 break; 203 } 204 205 // Note: byte_no also appears in TemplateTable::resolve. 206 if (byte_no == 1) { 207 assert(invoke_code != Bytecodes::_invokevirtual && 208 invoke_code != Bytecodes::_invokeinterface, ""); 209 set_bytecode_1(invoke_code); 210 } else if (byte_no == 2) { 211 if (change_to_virtual) { 212 assert(invoke_code == Bytecodes::_invokeinterface, ""); 213 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! 214 // 215 // Workaround for the case where we encounter an invokeinterface, but we 216 // should really have an _invokevirtual since the resolved method is a 217 // virtual method in java.lang.Object. This is a corner case in the spec 218 // but is presumably legal. javac does not generate this code. 219 // 220 // We set bytecode_1() to _invokeinterface, because that is the 221 // bytecode # used by the interpreter to see if it is resolved. 222 // We set bytecode_2() to _invokevirtual. 223 // See also interpreterRuntime.cpp. (8/25/2000) 224 // Only set resolved for the invokeinterface case if method is public. 225 // Otherwise, the method needs to be reresolved with caller for each 226 // interface call. 227 if (method->is_public()) set_bytecode_1(invoke_code); 228 } else { 229 assert(invoke_code == Bytecodes::_invokevirtual, ""); 230 } 231 // set up for invokevirtual, even if linking for invokeinterface also: 232 set_bytecode_2(Bytecodes::_invokevirtual); 233 } else { 234 ShouldNotReachHere(); 235 } 236 NOT_PRODUCT(verify(tty)); 237 } 238 239 void ConstantPoolCacheEntry::set_direct_call(Bytecodes::Code invoke_code, methodHandle method) { 240 int index = Method::nonvirtual_vtable_index; 241 // index < 0; FIXME: inline and customize set_direct_or_vtable_call 242 set_direct_or_vtable_call(invoke_code, method, index); 243 } 244 245 void ConstantPoolCacheEntry::set_vtable_call(Bytecodes::Code invoke_code, methodHandle method, int index) { 246 // either the method is a miranda or its holder should accept the given index 247 assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), ""); 248 // index >= 0; FIXME: inline and customize set_direct_or_vtable_call 249 set_direct_or_vtable_call(invoke_code, method, index); 250 } 251 252 void ConstantPoolCacheEntry::set_itable_call(Bytecodes::Code invoke_code, methodHandle method, int index) { 253 assert(method->method_holder()->verify_itable_index(index), ""); 254 assert(invoke_code == Bytecodes::_invokeinterface, ""); 255 InstanceKlass* interf = method->method_holder(); 256 assert(interf->is_interface(), "must be an interface"); 257 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here"); 258 set_f1(interf); 259 set_f2(index); 260 set_method_flags(as_TosState(method->result_type()), 261 0, // no option bits 262 method()->size_of_parameters()); 263 set_bytecode_1(Bytecodes::_invokeinterface); 264 } 265 266 267 void ConstantPoolCacheEntry::set_method_handle(constantPoolHandle cpool, const CallInfo &call_info) { 268 set_method_handle_common(cpool, Bytecodes::_invokehandle, call_info); 269 } 270 271 void ConstantPoolCacheEntry::set_dynamic_call(constantPoolHandle cpool, const CallInfo &call_info) { 272 set_method_handle_common(cpool, Bytecodes::_invokedynamic, call_info); 273 } 274 275 void ConstantPoolCacheEntry::set_method_handle_common(constantPoolHandle cpool, 276 Bytecodes::Code invoke_code, 277 const CallInfo &call_info) { 278 // NOTE: This CPCE can be the subject of data races. 279 // There are three words to update: flags, refs[f2], f1 (in that order). 280 // Writers must store all other values before f1. 281 // Readers must test f1 first for non-null before reading other fields. 282 // Competing writers must acquire exclusive access via a lock. 283 // A losing writer waits on the lock until the winner writes f1 and leaves 284 // the lock, so that when the losing writer returns, he can use the linked 285 // cache entry. 286 287 oop cplock = cpool->lock(); 288 ObjectLocker ol(cplock, Thread::current(), cplock != NULL); 289 if (!is_f1_null()) { 290 return; 291 } 292 293 const methodHandle adapter = call_info.resolved_method(); 294 const Handle appendix = call_info.resolved_appendix(); 295 const Handle method_type = call_info.resolved_method_type(); 296 const bool has_appendix = appendix.not_null(); 297 const bool has_method_type = method_type.not_null(); 298 299 // Write the flags. 300 set_method_flags(as_TosState(adapter->result_type()), 301 ((has_appendix ? 1 : 0) << has_appendix_shift ) | 302 ((has_method_type ? 1 : 0) << has_method_type_shift) | 303 ( 1 << is_final_shift ), 304 adapter->size_of_parameters()); 305 306 if (TraceInvokeDynamic) { 307 tty->print_cr("set_method_handle bc=%d appendix="PTR_FORMAT"%s method_type="PTR_FORMAT"%s method="PTR_FORMAT" ", 308 invoke_code, 309 (intptr_t)appendix(), (has_appendix ? "" : " (unused)"), 310 (intptr_t)method_type(), (has_method_type ? "" : " (unused)"), 311 (intptr_t)adapter()); 312 adapter->print(); 313 if (has_appendix) appendix()->print(); 314 } 315 316 // Method handle invokes and invokedynamic sites use both cp cache words. 317 // refs[f2], if not null, contains a value passed as a trailing argument to the adapter. 318 // In the general case, this could be the call site's MethodType, 319 // for use with java.lang.Invokers.checkExactType, or else a CallSite object. 320 // f1 contains the adapter method which manages the actual call. 321 // In the general case, this is a compiled LambdaForm. 322 // (The Java code is free to optimize these calls by binding other 323 // sorts of methods and appendices to call sites.) 324 // JVM-level linking is via f1, as if for invokespecial, and signatures are erased. 325 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits. 326 // Even with the appendix, the method will never take more than 255 parameter slots. 327 // 328 // This means that given a call site like (List)mh.invoke("foo"), 329 // the f1 method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;', 330 // not '(Ljava/lang/String;)Ljava/util/List;'. 331 // The fact that String and List are involved is encoded in the MethodType in refs[f2]. 332 // This allows us to create fewer method oops, while keeping type safety. 333 // 334 335 objArrayHandle resolved_references = cpool->resolved_references(); 336 // Store appendix, if any. 337 if (has_appendix) { 338 const int appendix_index = f2_as_index() + _indy_resolved_references_appendix_offset; 339 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob"); 340 assert(resolved_references->obj_at(appendix_index) == NULL, "init just once"); 341 resolved_references->obj_at_put(appendix_index, appendix()); 342 } 343 344 // Store MethodType, if any. 345 if (has_method_type) { 346 const int method_type_index = f2_as_index() + _indy_resolved_references_method_type_offset; 347 assert(method_type_index >= 0 && method_type_index < resolved_references->length(), "oob"); 348 assert(resolved_references->obj_at(method_type_index) == NULL, "init just once"); 349 resolved_references->obj_at_put(method_type_index, method_type()); 350 } 351 352 release_set_f1(adapter()); // This must be the last one to set (see NOTE above)! 353 354 // The interpreter assembly code does not check byte_2, 355 // but it is used by is_resolved, method_if_resolved, etc. 356 set_bytecode_1(invoke_code); 357 NOT_PRODUCT(verify(tty)); 358 if (TraceInvokeDynamic) { 359 this->print(tty, 0); 360 } 361 } 362 363 Method* ConstantPoolCacheEntry::method_if_resolved(constantPoolHandle cpool) { 364 // Decode the action of set_method and set_interface_call 365 Bytecodes::Code invoke_code = bytecode_1(); 366 if (invoke_code != (Bytecodes::Code)0) { 367 Metadata* f1 = (Metadata*)_f1; 368 if (f1 != NULL) { 369 switch (invoke_code) { 370 case Bytecodes::_invokeinterface: 371 assert(f1->is_klass(), ""); 372 return klassItable::method_for_itable_index((Klass*)f1, f2_as_index()); 373 case Bytecodes::_invokestatic: 374 case Bytecodes::_invokespecial: 375 assert(!has_appendix(), ""); 376 case Bytecodes::_invokehandle: 377 case Bytecodes::_invokedynamic: 378 assert(f1->is_method(), ""); 379 return (Method*)f1; 380 } 381 } 382 } 383 invoke_code = bytecode_2(); 384 if (invoke_code != (Bytecodes::Code)0) { 385 switch (invoke_code) { 386 case Bytecodes::_invokevirtual: 387 if (is_vfinal()) { 388 // invokevirtual 389 Method* m = f2_as_vfinal_method(); 390 assert(m->is_method(), ""); 391 return m; 392 } else { 393 int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index()); 394 if (cpool->tag_at(holder_index).is_klass()) { 395 Klass* klass = cpool->resolved_klass_at(holder_index); 396 if (!klass->oop_is_instance()) 397 klass = SystemDictionary::Object_klass(); 398 return InstanceKlass::cast(klass)->method_at_vtable(f2_as_index()); 399 } 400 } 401 break; 402 } 403 } 404 return NULL; 405 } 406 407 408 oop ConstantPoolCacheEntry::appendix_if_resolved(constantPoolHandle cpool) { 409 if (is_f1_null() || !has_appendix()) 410 return NULL; 411 const int ref_index = f2_as_index() + _indy_resolved_references_appendix_offset; 412 objArrayOop resolved_references = cpool->resolved_references(); 413 return resolved_references->obj_at(ref_index); 414 } 415 416 417 oop ConstantPoolCacheEntry::method_type_if_resolved(constantPoolHandle cpool) { 418 if (is_f1_null() || !has_method_type()) 419 return NULL; 420 const int ref_index = f2_as_index() + _indy_resolved_references_method_type_offset; 421 objArrayOop resolved_references = cpool->resolved_references(); 422 return resolved_references->obj_at(ref_index); 423 } 424 425 426 #if INCLUDE_JVMTI 427 // RedefineClasses() API support: 428 // If this ConstantPoolCacheEntry refers to old_method then update it 429 // to refer to new_method. 430 bool ConstantPoolCacheEntry::adjust_method_entry(Method* old_method, 431 Method* new_method, bool * trace_name_printed) { 432 433 if (is_vfinal()) { 434 // virtual and final so _f2 contains method ptr instead of vtable index 435 if (f2_as_vfinal_method() == old_method) { 436 // match old_method so need an update 437 // NOTE: can't use set_f2_as_vfinal_method as it asserts on different values 438 _f2 = (intptr_t)new_method; 439 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 440 if (!(*trace_name_printed)) { 441 // RC_TRACE_MESG macro has an embedded ResourceMark 442 RC_TRACE_MESG(("adjust: name=%s", 443 old_method->method_holder()->external_name())); 444 *trace_name_printed = true; 445 } 446 // RC_TRACE macro has an embedded ResourceMark 447 RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)", 448 new_method->name()->as_C_string(), 449 new_method->signature()->as_C_string())); 450 } 451 452 return true; 453 } 454 455 // f1() is not used with virtual entries so bail out 456 return false; 457 } 458 459 if (_f1 == NULL) { 460 // NULL f1() means this is a virtual entry so bail out 461 // We are assuming that the vtable index does not need change. 462 return false; 463 } 464 465 if (_f1 == old_method) { 466 _f1 = new_method; 467 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 468 if (!(*trace_name_printed)) { 469 // RC_TRACE_MESG macro has an embedded ResourceMark 470 RC_TRACE_MESG(("adjust: name=%s", 471 old_method->method_holder()->external_name())); 472 *trace_name_printed = true; 473 } 474 // RC_TRACE macro has an embedded ResourceMark 475 RC_TRACE(0x00400000, ("cpc entry update: %s(%s)", 476 new_method->name()->as_C_string(), 477 new_method->signature()->as_C_string())); 478 } 479 480 return true; 481 } 482 483 return false; 484 } 485 486 // a constant pool cache entry should never contain old or obsolete methods 487 bool ConstantPoolCacheEntry::check_no_old_or_obsolete_entries() { 488 if (is_vfinal()) { 489 // virtual and final so _f2 contains method ptr instead of vtable index 490 Metadata* f2 = (Metadata*)_f2; 491 // Return false if _f2 refers to an old or an obsolete method. 492 // _f2 == NULL || !_f2->is_method() are just as unexpected here. 493 return (f2 != NULL NOT_PRODUCT(&& f2->is_valid()) && f2->is_method() && 494 !((Method*)f2)->is_old() && !((Method*)f2)->is_obsolete()); 495 } else if (_f1 == NULL || 496 (NOT_PRODUCT(_f1->is_valid() &&) !_f1->is_method())) { 497 // _f1 == NULL || !_f1->is_method() are OK here 498 return true; 499 } 500 // return false if _f1 refers to an old or an obsolete method 501 return (NOT_PRODUCT(_f1->is_valid() &&) _f1->is_method() && 502 !((Method*)_f1)->is_old() && !((Method*)_f1)->is_obsolete()); 503 } 504 505 bool ConstantPoolCacheEntry::is_interesting_method_entry(Klass* k) { 506 if (!is_method_entry()) { 507 // not a method entry so not interesting by default 508 return false; 509 } 510 511 Method* m = NULL; 512 if (is_vfinal()) { 513 // virtual and final so _f2 contains method ptr instead of vtable index 514 m = f2_as_vfinal_method(); 515 } else if (is_f1_null()) { 516 // NULL _f1 means this is a virtual entry so also not interesting 517 return false; 518 } else { 519 if (!(_f1->is_method())) { 520 // _f1 can also contain a Klass* for an interface 521 return false; 522 } 523 m = f1_as_method(); 524 } 525 526 assert(m != NULL && m->is_method(), "sanity check"); 527 if (m == NULL || !m->is_method() || (k != NULL && m->method_holder() != k)) { 528 // robustness for above sanity checks or method is not in 529 // the interesting class 530 return false; 531 } 532 533 // the method is in the interesting class so the entry is interesting 534 return true; 535 } 536 #endif // INCLUDE_JVMTI 537 538 void ConstantPoolCacheEntry::print(outputStream* st, int index) const { 539 // print separator 540 if (index == 0) st->print_cr(" -------------"); 541 // print entry 542 st->print("%3d ("PTR_FORMAT") ", index, (intptr_t)this); 543 st->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(), 544 constant_pool_index()); 545 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f1); 546 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f2); 547 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_flags); 548 st->print_cr(" -------------"); 549 } 550 551 void ConstantPoolCacheEntry::verify(outputStream* st) const { 552 // not implemented yet 553 } 554 555 // Implementation of ConstantPoolCache 556 557 ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data, 558 int length, 559 const intStack& index_map, 560 const intStack& invokedynamic_map, TRAPS) { 561 int size = ConstantPoolCache::size(length); 562 563 return new (loader_data, size, false, MetaspaceObj::ConstantPoolCacheType, THREAD) 564 ConstantPoolCache(length, index_map, invokedynamic_map); 565 } 566 567 void ConstantPoolCache::initialize(const intArray& inverse_index_map, 568 const intArray& invokedynamic_references_map) { 569 assert(inverse_index_map.length() == length(), "inverse index map must have same length as cache"); 570 for (int i = 0; i < length(); i++) { 571 ConstantPoolCacheEntry* e = entry_at(i); 572 int original_index = inverse_index_map[i]; 573 e->initialize_entry(original_index); 574 assert(entry_at(i) == e, "sanity"); 575 } 576 for (int ref = 0; ref < invokedynamic_references_map.length(); ref++) { 577 const int cpci = invokedynamic_references_map[ref]; 578 if (cpci >= 0) { 579 #ifdef ASSERT 580 // invokedynamic and invokehandle have more entries; check if they 581 // all point to the same constant pool cache entry. 582 for (int entry = 1; entry < ConstantPoolCacheEntry::_indy_resolved_references_entries; entry++) { 583 const int cpci_next = invokedynamic_references_map[ref + entry]; 584 assert(cpci == cpci_next, err_msg_res("%d == %d", cpci, cpci_next)); 585 } 586 #endif 587 entry_at(cpci)->initialize_resolved_reference_index(ref); 588 ref += ConstantPoolCacheEntry::_indy_resolved_references_entries - 1; // skip extra entries 589 } 590 } 591 } 592 593 #if INCLUDE_JVMTI 594 // RedefineClasses() API support: 595 // If any entry of this ConstantPoolCache points to any of 596 // old_methods, replace it with the corresponding new_method. 597 void ConstantPoolCache::adjust_method_entries(Method** old_methods, Method** new_methods, 598 int methods_length, bool * trace_name_printed) { 599 600 if (methods_length == 0) { 601 // nothing to do if there are no methods 602 return; 603 } 604 605 // get shorthand for the interesting class 606 Klass* old_holder = old_methods[0]->method_holder(); 607 608 for (int i = 0; i < length(); i++) { 609 if (!entry_at(i)->is_interesting_method_entry(old_holder)) { 610 // skip uninteresting methods 611 continue; 612 } 613 614 // The ConstantPoolCache contains entries for several different 615 // things, but we only care about methods. In fact, we only care 616 // about methods in the same class as the one that contains the 617 // old_methods. At this point, we have an interesting entry. 618 619 for (int j = 0; j < methods_length; j++) { 620 Method* old_method = old_methods[j]; 621 Method* new_method = new_methods[j]; 622 623 if (entry_at(i)->adjust_method_entry(old_method, new_method, 624 trace_name_printed)) { 625 // current old_method matched this entry and we updated it so 626 // break out and get to the next interesting entry if there one 627 break; 628 } 629 } 630 } 631 } 632 633 // the constant pool cache should never contain old or obsolete methods 634 bool ConstantPoolCache::check_no_old_or_obsolete_entries() { 635 for (int i = 1; i < length(); i++) { 636 if (entry_at(i)->is_interesting_method_entry(NULL) && 637 !entry_at(i)->check_no_old_or_obsolete_entries()) { 638 return false; 639 } 640 } 641 return true; 642 } 643 644 void ConstantPoolCache::dump_cache() { 645 for (int i = 1; i < length(); i++) { 646 if (entry_at(i)->is_interesting_method_entry(NULL)) { 647 entry_at(i)->print(tty, i); 648 } 649 } 650 } 651 #endif // INCLUDE_JVMTI 652 653 654 // Printing 655 656 void ConstantPoolCache::print_on(outputStream* st) const { 657 assert(is_constantPoolCache(), "obj must be constant pool cache"); 658 st->print_cr(internal_name()); 659 // print constant pool cache entries 660 for (int i = 0; i < length(); i++) entry_at(i)->print(st, i); 661 } 662 663 void ConstantPoolCache::print_value_on(outputStream* st) const { 664 assert(is_constantPoolCache(), "obj must be constant pool cache"); 665 st->print("cache [%d]", length()); 666 print_address_on(st); 667 st->print(" for "); 668 constant_pool()->print_value_on(st); 669 } 670 671 672 // Verification 673 674 void ConstantPoolCache::verify_on(outputStream* st) { 675 guarantee(is_constantPoolCache(), "obj must be constant pool cache"); 676 // print constant pool cache entries 677 for (int i = 0; i < length(); i++) entry_at(i)->verify(st); 678 }