1 /* 2 * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "interpreter/interpreter.hpp" 27 #include "interpreter/rewriter.hpp" 28 #include "logging/log.hpp" 29 #include "memory/metaspaceClosure.hpp" 30 #include "memory/resourceArea.hpp" 31 #include "memory/universe.inline.hpp" 32 #include "oops/cpCache.hpp" 33 #include "oops/objArrayOop.inline.hpp" 34 #include "oops/oop.inline.hpp" 35 #include "prims/methodHandles.hpp" 36 #include "runtime/atomic.hpp" 37 #include "runtime/handles.inline.hpp" 38 #include "runtime/orderAccess.inline.hpp" 39 #include "utilities/macros.hpp" 40 41 // Implementation of ConstantPoolCacheEntry 42 43 void ConstantPoolCacheEntry::initialize_entry(int index) { 44 assert(0 < index && index < 0x10000, "sanity check"); 45 _indices = index; 46 _f1 = NULL; 47 _f2 = _flags = 0; 48 assert(constant_pool_index() == index, ""); 49 } 50 51 int ConstantPoolCacheEntry::make_flags(TosState state, 52 int option_bits, 53 int field_index_or_method_params) { 54 assert(state < number_of_states, "Invalid state in make_flags"); 55 int f = ((int)state << tos_state_shift) | option_bits | field_index_or_method_params; 56 // Preserve existing flag bit values 57 // The low bits are a field offset, or else the method parameter size. 58 #ifdef ASSERT 59 TosState old_state = flag_state(); 60 assert(old_state == (TosState)0 || old_state == state, 61 "inconsistent cpCache flags state"); 62 #endif 63 return (_flags | f) ; 64 } 65 66 void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) { 67 #ifdef ASSERT 68 // Read once. 69 volatile Bytecodes::Code c = bytecode_1(); 70 assert(c == 0 || c == code || code == 0, "update must be consistent"); 71 #endif 72 // Need to flush pending stores here before bytecode is written. 73 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_1_shift)); 74 } 75 76 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) { 77 #ifdef ASSERT 78 // Read once. 79 volatile Bytecodes::Code c = bytecode_2(); 80 assert(c == 0 || c == code || code == 0, "update must be consistent"); 81 #endif 82 // Need to flush pending stores here before bytecode is written. 83 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_2_shift)); 84 } 85 86 // Sets f1, ordering with previous writes. 87 void ConstantPoolCacheEntry::release_set_f1(Metadata* f1) { 88 assert(f1 != NULL, ""); 89 OrderAccess::release_store_ptr((HeapWord*) &_f1, f1); 90 } 91 92 // Sets flags, but only if the value was previously zero. 93 bool ConstantPoolCacheEntry::init_flags_atomic(intptr_t flags) { 94 intptr_t result = Atomic::cmpxchg_ptr(flags, &_flags, 0); 95 return (result == 0); 96 } 97 98 // Note that concurrent update of both bytecodes can leave one of them 99 // reset to zero. This is harmless; the interpreter will simply re-resolve 100 // the damaged entry. More seriously, the memory synchronization is needed 101 // to flush other fields (f1, f2) completely to memory before the bytecodes 102 // are updated, lest other processors see a non-zero bytecode but zero f1/f2. 103 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code, 104 Bytecodes::Code put_code, 105 Klass* field_holder, 106 int field_index, 107 int field_offset, 108 TosState field_type, 109 bool is_final, 110 bool is_volatile, 111 Klass* root_klass) { 112 set_f1(field_holder); 113 set_f2(field_offset); 114 assert((field_index & field_index_mask) == field_index, 115 "field index does not fit in low flag bits"); 116 set_field_flags(field_type, 117 ((is_volatile ? 1 : 0) << is_volatile_shift) | 118 ((is_final ? 1 : 0) << is_final_shift), 119 field_index); 120 set_bytecode_1(get_code); 121 set_bytecode_2(put_code); 122 NOT_PRODUCT(verify(tty)); 123 } 124 125 void ConstantPoolCacheEntry::set_parameter_size(int value) { 126 // This routine is called only in corner cases where the CPCE is not yet initialized. 127 // See AbstractInterpreter::deopt_continue_after_entry. 128 assert(_flags == 0 || parameter_size() == 0 || parameter_size() == value, 129 "size must not change: parameter_size=%d, value=%d", parameter_size(), value); 130 // Setting the parameter size by itself is only safe if the 131 // current value of _flags is 0, otherwise another thread may have 132 // updated it and we don't want to overwrite that value. Don't 133 // bother trying to update it once it's nonzero but always make 134 // sure that the final parameter size agrees with what was passed. 135 if (_flags == 0) { 136 Atomic::cmpxchg_ptr((value & parameter_size_mask), &_flags, 0); 137 } 138 guarantee(parameter_size() == value, 139 "size must not change: parameter_size=%d, value=%d", parameter_size(), value); 140 } 141 142 void ConstantPoolCacheEntry::set_direct_or_vtable_call(Bytecodes::Code invoke_code, 143 const methodHandle& method, 144 int vtable_index, 145 bool sender_is_interface) { 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 // Don't mark invokespecial to method as resolved if sender is an interface. The receiver 210 // has to be checked that it is a subclass of the current class every time this bytecode 211 // is executed. 212 if (invoke_code != Bytecodes::_invokespecial || !sender_is_interface || 213 method->name() == vmSymbols::object_initializer_name()) { 214 set_bytecode_1(invoke_code); 215 } 216 } else if (byte_no == 2) { 217 if (change_to_virtual) { 218 assert(invoke_code == Bytecodes::_invokeinterface, ""); 219 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! 220 // 221 // Workaround for the case where we encounter an invokeinterface, but we 222 // should really have an _invokevirtual since the resolved method is a 223 // virtual method in java.lang.Object. This is a corner case in the spec 224 // but is presumably legal. javac does not generate this code. 225 // 226 // We set bytecode_1() to _invokeinterface, because that is the 227 // bytecode # used by the interpreter to see if it is resolved. 228 // We set bytecode_2() to _invokevirtual. 229 // See also interpreterRuntime.cpp. (8/25/2000) 230 // Only set resolved for the invokeinterface case if method is public. 231 // Otherwise, the method needs to be reresolved with caller for each 232 // interface call. 233 if (method->is_public()) set_bytecode_1(invoke_code); 234 } else { 235 assert(invoke_code == Bytecodes::_invokevirtual, ""); 236 } 237 // set up for invokevirtual, even if linking for invokeinterface also: 238 set_bytecode_2(Bytecodes::_invokevirtual); 239 } else { 240 ShouldNotReachHere(); 241 } 242 NOT_PRODUCT(verify(tty)); 243 } 244 245 void ConstantPoolCacheEntry::set_direct_call(Bytecodes::Code invoke_code, const methodHandle& method, 246 bool sender_is_interface) { 247 int index = Method::nonvirtual_vtable_index; 248 // index < 0; FIXME: inline and customize set_direct_or_vtable_call 249 set_direct_or_vtable_call(invoke_code, method, index, sender_is_interface); 250 } 251 252 void ConstantPoolCacheEntry::set_vtable_call(Bytecodes::Code invoke_code, const methodHandle& method, int index) { 253 // either the method is a miranda or its holder should accept the given index 254 assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), ""); 255 // index >= 0; FIXME: inline and customize set_direct_or_vtable_call 256 set_direct_or_vtable_call(invoke_code, method, index, false); 257 } 258 259 void ConstantPoolCacheEntry::set_itable_call(Bytecodes::Code invoke_code, const methodHandle& method, int index) { 260 assert(method->method_holder()->verify_itable_index(index), ""); 261 assert(invoke_code == Bytecodes::_invokeinterface, ""); 262 InstanceKlass* interf = method->method_holder(); 263 assert(interf->is_interface(), "must be an interface"); 264 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here"); 265 set_f1(interf); 266 set_f2(index); 267 set_method_flags(as_TosState(method->result_type()), 268 0, // no option bits 269 method()->size_of_parameters()); 270 set_bytecode_1(Bytecodes::_invokeinterface); 271 } 272 273 274 void ConstantPoolCacheEntry::set_method_handle(const constantPoolHandle& cpool, const CallInfo &call_info) { 275 set_method_handle_common(cpool, Bytecodes::_invokehandle, call_info); 276 } 277 278 void ConstantPoolCacheEntry::set_dynamic_call(const constantPoolHandle& cpool, const CallInfo &call_info) { 279 set_method_handle_common(cpool, Bytecodes::_invokedynamic, call_info); 280 } 281 282 void ConstantPoolCacheEntry::set_method_handle_common(const constantPoolHandle& cpool, 283 Bytecodes::Code invoke_code, 284 const CallInfo &call_info) { 285 // NOTE: This CPCE can be the subject of data races. 286 // There are three words to update: flags, refs[f2], f1 (in that order). 287 // Writers must store all other values before f1. 288 // Readers must test f1 first for non-null before reading other fields. 289 // Competing writers must acquire exclusive access via a lock. 290 // A losing writer waits on the lock until the winner writes f1 and leaves 291 // the lock, so that when the losing writer returns, he can use the linked 292 // cache entry. 293 294 objArrayHandle resolved_references(Thread::current(), cpool->resolved_references()); 295 // Use the resolved_references() lock for this cpCache entry. 296 // resolved_references are created for all classes with Invokedynamic, MethodHandle 297 // or MethodType constant pool cache entries. 298 assert(resolved_references() != NULL, 299 "a resolved_references array should have been created for this class"); 300 ObjectLocker ol(resolved_references, Thread::current()); 301 if (!is_f1_null()) { 302 return; 303 } 304 305 const methodHandle adapter = call_info.resolved_method(); 306 const Handle appendix = call_info.resolved_appendix(); 307 const Handle method_type = call_info.resolved_method_type(); 308 const bool has_appendix = appendix.not_null(); 309 const bool has_method_type = method_type.not_null(); 310 311 // Write the flags. 312 set_method_flags(as_TosState(adapter->result_type()), 313 ((has_appendix ? 1 : 0) << has_appendix_shift ) | 314 ((has_method_type ? 1 : 0) << has_method_type_shift) | 315 ( 1 << is_final_shift ), 316 adapter->size_of_parameters()); 317 318 if (TraceInvokeDynamic) { 319 ttyLocker ttyl; 320 tty->print_cr("set_method_handle bc=%d appendix=" PTR_FORMAT "%s method_type=" PTR_FORMAT "%s method=" PTR_FORMAT " ", 321 invoke_code, 322 p2i(appendix()), (has_appendix ? "" : " (unused)"), 323 p2i(method_type()), (has_method_type ? "" : " (unused)"), 324 p2i(adapter())); 325 adapter->print(); 326 if (has_appendix) appendix()->print(); 327 } 328 329 // Method handle invokes and invokedynamic sites use both cp cache words. 330 // refs[f2], if not null, contains a value passed as a trailing argument to the adapter. 331 // In the general case, this could be the call site's MethodType, 332 // for use with java.lang.Invokers.checkExactType, or else a CallSite object. 333 // f1 contains the adapter method which manages the actual call. 334 // In the general case, this is a compiled LambdaForm. 335 // (The Java code is free to optimize these calls by binding other 336 // sorts of methods and appendices to call sites.) 337 // JVM-level linking is via f1, as if for invokespecial, and signatures are erased. 338 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits. 339 // Even with the appendix, the method will never take more than 255 parameter slots. 340 // 341 // This means that given a call site like (List)mh.invoke("foo"), 342 // the f1 method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;', 343 // not '(Ljava/lang/String;)Ljava/util/List;'. 344 // The fact that String and List are involved is encoded in the MethodType in refs[f2]. 345 // This allows us to create fewer Methods, while keeping type safety. 346 // 347 348 // Store appendix, if any. 349 if (has_appendix) { 350 const int appendix_index = f2_as_index() + _indy_resolved_references_appendix_offset; 351 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob"); 352 assert(resolved_references->obj_at(appendix_index) == NULL, "init just once"); 353 resolved_references->obj_at_put(appendix_index, appendix()); 354 } 355 356 // Store MethodType, if any. 357 if (has_method_type) { 358 const int method_type_index = f2_as_index() + _indy_resolved_references_method_type_offset; 359 assert(method_type_index >= 0 && method_type_index < resolved_references->length(), "oob"); 360 assert(resolved_references->obj_at(method_type_index) == NULL, "init just once"); 361 resolved_references->obj_at_put(method_type_index, method_type()); 362 } 363 364 release_set_f1(adapter()); // This must be the last one to set (see NOTE above)! 365 366 // The interpreter assembly code does not check byte_2, 367 // but it is used by is_resolved, method_if_resolved, etc. 368 set_bytecode_1(invoke_code); 369 NOT_PRODUCT(verify(tty)); 370 if (TraceInvokeDynamic) { 371 ttyLocker ttyl; 372 this->print(tty, 0); 373 } 374 } 375 376 Method* ConstantPoolCacheEntry::method_if_resolved(const constantPoolHandle& cpool) { 377 // Decode the action of set_method and set_interface_call 378 Bytecodes::Code invoke_code = bytecode_1(); 379 if (invoke_code != (Bytecodes::Code)0) { 380 Metadata* f1 = f1_ord(); 381 if (f1 != NULL) { 382 switch (invoke_code) { 383 case Bytecodes::_invokeinterface: 384 assert(f1->is_klass(), ""); 385 return klassItable::method_for_itable_index((Klass*)f1, f2_as_index()); 386 case Bytecodes::_invokestatic: 387 case Bytecodes::_invokespecial: 388 assert(!has_appendix(), ""); 389 case Bytecodes::_invokehandle: 390 case Bytecodes::_invokedynamic: 391 assert(f1->is_method(), ""); 392 return (Method*)f1; 393 default: 394 break; 395 } 396 } 397 } 398 invoke_code = bytecode_2(); 399 if (invoke_code != (Bytecodes::Code)0) { 400 switch (invoke_code) { 401 case Bytecodes::_invokevirtual: 402 if (is_vfinal()) { 403 // invokevirtual 404 Method* m = f2_as_vfinal_method(); 405 assert(m->is_method(), ""); 406 return m; 407 } else { 408 int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index()); 409 if (cpool->tag_at(holder_index).is_klass()) { 410 Klass* klass = cpool->resolved_klass_at(holder_index); 411 return klass->method_at_vtable(f2_as_index()); 412 } 413 } 414 break; 415 default: 416 break; 417 } 418 } 419 return NULL; 420 } 421 422 423 oop ConstantPoolCacheEntry::appendix_if_resolved(const constantPoolHandle& cpool) { 424 if (!has_appendix()) 425 return NULL; 426 const int ref_index = f2_as_index() + _indy_resolved_references_appendix_offset; 427 objArrayOop resolved_references = cpool->resolved_references(); 428 return resolved_references->obj_at(ref_index); 429 } 430 431 432 oop ConstantPoolCacheEntry::method_type_if_resolved(const constantPoolHandle& cpool) { 433 if (!has_method_type()) 434 return NULL; 435 const int ref_index = f2_as_index() + _indy_resolved_references_method_type_offset; 436 objArrayOop resolved_references = cpool->resolved_references(); 437 return resolved_references->obj_at(ref_index); 438 } 439 440 441 #if INCLUDE_JVMTI 442 // RedefineClasses() API support: 443 // If this ConstantPoolCacheEntry refers to old_method then update it 444 // to refer to new_method. 445 bool ConstantPoolCacheEntry::adjust_method_entry(Method* old_method, 446 Method* new_method, bool * trace_name_printed) { 447 448 if (is_vfinal()) { 449 // virtual and final so _f2 contains method ptr instead of vtable index 450 if (f2_as_vfinal_method() == old_method) { 451 // match old_method so need an update 452 // NOTE: can't use set_f2_as_vfinal_method as it asserts on different values 453 _f2 = (intptr_t)new_method; 454 if (log_is_enabled(Info, redefine, class, update)) { 455 ResourceMark rm; 456 if (!(*trace_name_printed)) { 457 log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name()); 458 *trace_name_printed = true; 459 } 460 log_debug(redefine, class, update, constantpool) 461 ("cpc vf-entry update: %s(%s)", new_method->name()->as_C_string(), new_method->signature()->as_C_string()); 462 } 463 return true; 464 } 465 466 // f1() is not used with virtual entries so bail out 467 return false; 468 } 469 470 if (_f1 == NULL) { 471 // NULL f1() means this is a virtual entry so bail out 472 // We are assuming that the vtable index does not need change. 473 return false; 474 } 475 476 if (_f1 == old_method) { 477 _f1 = new_method; 478 if (log_is_enabled(Info, redefine, class, update)) { 479 ResourceMark rm; 480 if (!(*trace_name_printed)) { 481 log_info(redefine, class, update)("adjust: name=%s", old_method->method_holder()->external_name()); 482 *trace_name_printed = true; 483 } 484 log_debug(redefine, class, update, constantpool) 485 ("cpc entry update: %s(%s)", new_method->name()->as_C_string(), new_method->signature()->as_C_string()); 486 } 487 return true; 488 } 489 490 return false; 491 } 492 493 // a constant pool cache entry should never contain old or obsolete methods 494 bool ConstantPoolCacheEntry::check_no_old_or_obsolete_entries() { 495 if (is_vfinal()) { 496 // virtual and final so _f2 contains method ptr instead of vtable index 497 Metadata* f2 = (Metadata*)_f2; 498 // Return false if _f2 refers to an old or an obsolete method. 499 // _f2 == NULL || !_f2->is_method() are just as unexpected here. 500 return (f2 != NULL NOT_PRODUCT(&& f2->is_valid()) && f2->is_method() && 501 !((Method*)f2)->is_old() && !((Method*)f2)->is_obsolete()); 502 } else if (_f1 == NULL || 503 (NOT_PRODUCT(_f1->is_valid() &&) !_f1->is_method())) { 504 // _f1 == NULL || !_f1->is_method() are OK here 505 return true; 506 } 507 // return false if _f1 refers to a non-deleted old or obsolete method 508 return (NOT_PRODUCT(_f1->is_valid() &&) _f1->is_method() && 509 (f1_as_method()->is_deleted() || 510 (!f1_as_method()->is_old() && !f1_as_method()->is_obsolete()))); 511 } 512 513 Method* ConstantPoolCacheEntry::get_interesting_method_entry(Klass* k) { 514 if (!is_method_entry()) { 515 // not a method entry so not interesting by default 516 return NULL; 517 } 518 Method* m = NULL; 519 if (is_vfinal()) { 520 // virtual and final so _f2 contains method ptr instead of vtable index 521 m = f2_as_vfinal_method(); 522 } else if (is_f1_null()) { 523 // NULL _f1 means this is a virtual entry so also not interesting 524 return NULL; 525 } else { 526 if (!(_f1->is_method())) { 527 // _f1 can also contain a Klass* for an interface 528 return NULL; 529 } 530 m = f1_as_method(); 531 } 532 assert(m != NULL && m->is_method(), "sanity check"); 533 if (m == NULL || !m->is_method() || (k != NULL && m->method_holder() != k)) { 534 // robustness for above sanity checks or method is not in 535 // the interesting class 536 return NULL; 537 } 538 // the method is in the interesting class so the entry is interesting 539 return m; 540 } 541 #endif // INCLUDE_JVMTI 542 543 void ConstantPoolCacheEntry::print(outputStream* st, int index) const { 544 // print separator 545 if (index == 0) st->print_cr(" -------------"); 546 // print entry 547 st->print("%3d (" PTR_FORMAT ") ", index, (intptr_t)this); 548 st->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(), 549 constant_pool_index()); 550 st->print_cr(" [ " PTR_FORMAT "]", (intptr_t)_f1); 551 st->print_cr(" [ " PTR_FORMAT "]", (intptr_t)_f2); 552 st->print_cr(" [ " PTR_FORMAT "]", (intptr_t)_flags); 553 st->print_cr(" -------------"); 554 } 555 556 void ConstantPoolCacheEntry::verify(outputStream* st) const { 557 // not implemented yet 558 } 559 560 // Implementation of ConstantPoolCache 561 562 ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data, 563 const intStack& index_map, 564 const intStack& invokedynamic_index_map, 565 const intStack& invokedynamic_map, TRAPS) { 566 567 const int length = index_map.length() + invokedynamic_index_map.length(); 568 int size = ConstantPoolCache::size(length); 569 570 return new (loader_data, size, MetaspaceObj::ConstantPoolCacheType, THREAD) 571 ConstantPoolCache(length, index_map, invokedynamic_index_map, invokedynamic_map); 572 } 573 574 void ConstantPoolCache::initialize(const intArray& inverse_index_map, 575 const intArray& invokedynamic_inverse_index_map, 576 const intArray& invokedynamic_references_map) { 577 for (int i = 0; i < inverse_index_map.length(); i++) { 578 ConstantPoolCacheEntry* e = entry_at(i); 579 int original_index = inverse_index_map.at(i); 580 e->initialize_entry(original_index); 581 assert(entry_at(i) == e, "sanity"); 582 } 583 584 // Append invokedynamic entries at the end 585 int invokedynamic_offset = inverse_index_map.length(); 586 for (int i = 0; i < invokedynamic_inverse_index_map.length(); i++) { 587 int offset = i + invokedynamic_offset; 588 ConstantPoolCacheEntry* e = entry_at(offset); 589 int original_index = invokedynamic_inverse_index_map.at(i); 590 e->initialize_entry(original_index); 591 assert(entry_at(offset) == e, "sanity"); 592 } 593 594 for (int ref = 0; ref < invokedynamic_references_map.length(); ref++) { 595 const int cpci = invokedynamic_references_map.at(ref); 596 if (cpci >= 0) { 597 #ifdef ASSERT 598 // invokedynamic and invokehandle have more entries; check if they 599 // all point to the same constant pool cache entry. 600 for (int entry = 1; entry < ConstantPoolCacheEntry::_indy_resolved_references_entries; entry++) { 601 const int cpci_next = invokedynamic_references_map.at(ref + entry); 602 assert(cpci == cpci_next, "%d == %d", cpci, cpci_next); 603 } 604 #endif 605 entry_at(cpci)->initialize_resolved_reference_index(ref); 606 ref += ConstantPoolCacheEntry::_indy_resolved_references_entries - 1; // skip extra entries 607 } 608 } 609 } 610 611 #if INCLUDE_JVMTI 612 // RedefineClasses() API support: 613 // If any entry of this ConstantPoolCache points to any of 614 // old_methods, replace it with the corresponding new_method. 615 void ConstantPoolCache::adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed) { 616 for (int i = 0; i < length(); i++) { 617 ConstantPoolCacheEntry* entry = entry_at(i); 618 Method* old_method = entry->get_interesting_method_entry(holder); 619 if (old_method == NULL || !old_method->is_old()) { 620 continue; // skip uninteresting entries 621 } 622 if (old_method->is_deleted()) { 623 // clean up entries with deleted methods 624 entry->initialize_entry(entry->constant_pool_index()); 625 continue; 626 } 627 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum()); 628 629 assert(new_method != NULL, "method_with_idnum() should not be NULL"); 630 assert(old_method != new_method, "sanity check"); 631 632 entry_at(i)->adjust_method_entry(old_method, new_method, trace_name_printed); 633 } 634 } 635 636 // the constant pool cache should never contain old or obsolete methods 637 bool ConstantPoolCache::check_no_old_or_obsolete_entries() { 638 for (int i = 1; i < length(); i++) { 639 if (entry_at(i)->get_interesting_method_entry(NULL) != NULL && 640 !entry_at(i)->check_no_old_or_obsolete_entries()) { 641 return false; 642 } 643 } 644 return true; 645 } 646 647 void ConstantPoolCache::dump_cache() { 648 for (int i = 1; i < length(); i++) { 649 if (entry_at(i)->get_interesting_method_entry(NULL) != NULL) { 650 entry_at(i)->print(tty, i); 651 } 652 } 653 } 654 #endif // INCLUDE_JVMTI 655 656 void ConstantPoolCache::metaspace_pointers_do(MetaspaceClosure* it) { 657 log_trace(cds)("Iter(ConstantPoolCache): %p", this); 658 it->push(&_constant_pool); 659 it->push(&_reference_map); 660 } 661 662 // Printing 663 664 void ConstantPoolCache::print_on(outputStream* st) const { 665 assert(is_constantPoolCache(), "obj must be constant pool cache"); 666 st->print_cr("%s", internal_name()); 667 // print constant pool cache entries 668 for (int i = 0; i < length(); i++) entry_at(i)->print(st, i); 669 } 670 671 void ConstantPoolCache::print_value_on(outputStream* st) const { 672 assert(is_constantPoolCache(), "obj must be constant pool cache"); 673 st->print("cache [%d]", length()); 674 print_address_on(st); 675 st->print(" for "); 676 constant_pool()->print_value_on(st); 677 } 678 679 680 // Verification 681 682 void ConstantPoolCache::verify_on(outputStream* st) { 683 guarantee(is_constantPoolCache(), "obj must be constant pool cache"); 684 // print constant pool cache entries 685 for (int i = 0; i < length(); i++) entry_at(i)->verify(st); 686 }