1 /* 2 * Copyright (c) 1998, 2014, 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/atomic.inline.hpp" 36 #include "runtime/handles.inline.hpp" 37 #include "runtime/orderAccess.inline.hpp" 38 #include "utilities/macros.hpp" 39 #if INCLUDE_ALL_GCS 40 # include "gc_implementation/parallelScavenge/psPromotionManager.hpp" 41 #endif // INCLUDE_ALL_GCS 42 43 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 44 45 // Implementation of ConstantPoolCacheEntry 46 47 void ConstantPoolCacheEntry::initialize_entry(int index) { 48 assert(0 < index && index < 0x10000, "sanity check"); 49 _indices = index; 50 _f1 = NULL; 51 _f2 = _flags = 0; 52 assert(constant_pool_index() == index, ""); 53 } 54 55 int ConstantPoolCacheEntry::make_flags(TosState state, 56 int option_bits, 57 int field_index_or_method_params) { 58 assert(state < number_of_states, "Invalid state in make_flags"); 59 int f = ((int)state << tos_state_shift) | option_bits | field_index_or_method_params; 60 // Preserve existing flag bit values 61 // The low bits are a field offset, or else the method parameter size. 62 #ifdef ASSERT 63 TosState old_state = flag_state(); 64 assert(old_state == (TosState)0 || old_state == state, 65 "inconsistent cpCache flags state"); 66 #endif 67 return (_flags | f) ; 68 } 69 70 void ConstantPoolCacheEntry::set_bytecode_1(Bytecodes::Code code) { 71 #ifdef ASSERT 72 // Read once. 73 volatile Bytecodes::Code c = bytecode_1(); 74 assert(c == 0 || c == code || code == 0, "update must be consistent"); 75 #endif 76 // Need to flush pending stores here before bytecode is written. 77 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_1_shift)); 78 } 79 80 void ConstantPoolCacheEntry::set_bytecode_2(Bytecodes::Code code) { 81 #ifdef ASSERT 82 // Read once. 83 volatile Bytecodes::Code c = bytecode_2(); 84 assert(c == 0 || c == code || code == 0, "update must be consistent"); 85 #endif 86 // Need to flush pending stores here before bytecode is written. 87 OrderAccess::release_store_ptr(&_indices, _indices | ((u_char)code << bytecode_2_shift)); 88 } 89 90 // Sets f1, ordering with previous writes. 91 void ConstantPoolCacheEntry::release_set_f1(Metadata* f1) { 92 assert(f1 != NULL, ""); 93 OrderAccess::release_store_ptr((HeapWord*) &_f1, f1); 94 } 95 96 // Sets flags, but only if the value was previously zero. 97 bool ConstantPoolCacheEntry::init_flags_atomic(intptr_t flags) { 98 intptr_t result = Atomic::cmpxchg_ptr(flags, &_flags, 0); 99 return (result == 0); 100 } 101 102 // Note that concurrent update of both bytecodes can leave one of them 103 // reset to zero. This is harmless; the interpreter will simply re-resolve 104 // the damaged entry. More seriously, the memory synchronization is needed 105 // to flush other fields (f1, f2) completely to memory before the bytecodes 106 // are updated, lest other processors see a non-zero bytecode but zero f1/f2. 107 void ConstantPoolCacheEntry::set_field(Bytecodes::Code get_code, 108 Bytecodes::Code put_code, 109 KlassHandle field_holder, 110 int field_index, 111 int field_offset, 112 TosState field_type, 113 bool is_final, 114 bool is_volatile, 115 Klass* root_klass) { 116 set_f1(field_holder()); 117 set_f2(field_offset); 118 assert((field_index & field_index_mask) == field_index, 119 "field index does not fit in low flag bits"); 120 set_field_flags(field_type, 121 ((is_volatile ? 1 : 0) << is_volatile_shift) | 122 ((is_final ? 1 : 0) << is_final_shift), 123 field_index); 124 set_bytecode_1(get_code); 125 set_bytecode_2(put_code); 126 NOT_PRODUCT(verify(tty)); 127 } 128 129 void ConstantPoolCacheEntry::set_parameter_size(int value) { 130 // This routine is called only in corner cases where the CPCE is not yet initialized. 131 // See AbstractInterpreter::deopt_continue_after_entry. 132 assert(_flags == 0 || parameter_size() == 0 || parameter_size() == value, 133 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value)); 134 // Setting the parameter size by itself is only safe if the 135 // current value of _flags is 0, otherwise another thread may have 136 // updated it and we don't want to overwrite that value. Don't 137 // bother trying to update it once it's nonzero but always make 138 // sure that the final parameter size agrees with what was passed. 139 if (_flags == 0) { 140 Atomic::cmpxchg_ptr((value & parameter_size_mask), &_flags, 0); 141 } 142 guarantee(parameter_size() == value, 143 err_msg("size must not change: parameter_size=%d, value=%d", parameter_size(), value)); 144 } 145 146 void ConstantPoolCacheEntry::set_direct_or_vtable_call(Bytecodes::Code invoke_code, 147 methodHandle method, 148 int vtable_index) { 149 bool is_vtable_call = (vtable_index >= 0); // FIXME: split this method on this boolean 150 assert(method->interpreter_entry() != NULL, "should have been set at this point"); 151 assert(!method->is_obsolete(), "attempt to write obsolete method to cpCache"); 152 153 int byte_no = -1; 154 bool change_to_virtual = false; 155 156 switch (invoke_code) { 157 case Bytecodes::_invokeinterface: 158 // We get here from InterpreterRuntime::resolve_invoke when an invokeinterface 159 // instruction somehow links to a non-interface method (in Object). 160 // In that case, the method has no itable index and must be invoked as a virtual. 161 // Set a flag to keep track of this corner case. 162 change_to_virtual = true; 163 164 // ...and fall through as if we were handling invokevirtual: 165 case Bytecodes::_invokevirtual: 166 { 167 if (!is_vtable_call) { 168 assert(method->can_be_statically_bound(), ""); 169 // set_f2_as_vfinal_method checks if is_vfinal flag is true. 170 set_method_flags(as_TosState(method->result_type()), 171 ( 1 << is_vfinal_shift) | 172 ((method->is_final_method() ? 1 : 0) << is_final_shift) | 173 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift), 174 method()->size_of_parameters()); 175 set_f2_as_vfinal_method(method()); 176 } else { 177 assert(!method->can_be_statically_bound(), ""); 178 assert(vtable_index >= 0, "valid index"); 179 assert(!method->is_final_method(), "sanity"); 180 set_method_flags(as_TosState(method->result_type()), 181 ((change_to_virtual ? 1 : 0) << is_forced_virtual_shift), 182 method()->size_of_parameters()); 183 set_f2(vtable_index); 184 } 185 byte_no = 2; 186 break; 187 } 188 189 case Bytecodes::_invokespecial: 190 case Bytecodes::_invokestatic: 191 assert(!is_vtable_call, ""); 192 // Note: Read and preserve the value of the is_vfinal flag on any 193 // invokevirtual bytecode shared with this constant pool cache entry. 194 // It is cheap and safe to consult is_vfinal() at all times. 195 // Once is_vfinal is set, it must stay that way, lest we get a dangling oop. 196 set_method_flags(as_TosState(method->result_type()), 197 ((is_vfinal() ? 1 : 0) << is_vfinal_shift) | 198 ((method->is_final_method() ? 1 : 0) << is_final_shift), 199 method()->size_of_parameters()); 200 set_f1(method()); 201 byte_no = 1; 202 break; 203 default: 204 ShouldNotReachHere(); 205 break; 206 } 207 208 // Note: byte_no also appears in TemplateTable::resolve. 209 if (byte_no == 1) { 210 assert(invoke_code != Bytecodes::_invokevirtual && 211 invoke_code != Bytecodes::_invokeinterface, ""); 212 set_bytecode_1(invoke_code); 213 } else if (byte_no == 2) { 214 if (change_to_virtual) { 215 assert(invoke_code == Bytecodes::_invokeinterface, ""); 216 // NOTE: THIS IS A HACK - BE VERY CAREFUL!!! 217 // 218 // Workaround for the case where we encounter an invokeinterface, but we 219 // should really have an _invokevirtual since the resolved method is a 220 // virtual method in java.lang.Object. This is a corner case in the spec 221 // but is presumably legal. javac does not generate this code. 222 // 223 // We set bytecode_1() to _invokeinterface, because that is the 224 // bytecode # used by the interpreter to see if it is resolved. 225 // We set bytecode_2() to _invokevirtual. 226 // See also interpreterRuntime.cpp. (8/25/2000) 227 // Only set resolved for the invokeinterface case if method is public. 228 // Otherwise, the method needs to be reresolved with caller for each 229 // interface call. 230 if (method->is_public()) set_bytecode_1(invoke_code); 231 } else { 232 assert(invoke_code == Bytecodes::_invokevirtual, ""); 233 } 234 // set up for invokevirtual, even if linking for invokeinterface also: 235 set_bytecode_2(Bytecodes::_invokevirtual); 236 } else { 237 ShouldNotReachHere(); 238 } 239 NOT_PRODUCT(verify(tty)); 240 } 241 242 void ConstantPoolCacheEntry::set_direct_call(Bytecodes::Code invoke_code, methodHandle method) { 243 int index = Method::nonvirtual_vtable_index; 244 // index < 0; FIXME: inline and customize set_direct_or_vtable_call 245 set_direct_or_vtable_call(invoke_code, method, index); 246 } 247 248 void ConstantPoolCacheEntry::set_vtable_call(Bytecodes::Code invoke_code, methodHandle method, int index) { 249 // either the method is a miranda or its holder should accept the given index 250 assert(method->method_holder()->is_interface() || method->method_holder()->verify_vtable_index(index), ""); 251 // index >= 0; FIXME: inline and customize set_direct_or_vtable_call 252 set_direct_or_vtable_call(invoke_code, method, index); 253 } 254 255 void ConstantPoolCacheEntry::set_itable_call(Bytecodes::Code invoke_code, methodHandle method, int index) { 256 assert(method->method_holder()->verify_itable_index(index), ""); 257 assert(invoke_code == Bytecodes::_invokeinterface, ""); 258 InstanceKlass* interf = method->method_holder(); 259 assert(interf->is_interface(), "must be an interface"); 260 assert(!method->is_final_method(), "interfaces do not have final methods; cannot link to one here"); 261 set_f1(interf); 262 set_f2(index); 263 set_method_flags(as_TosState(method->result_type()), 264 0, // no option bits 265 method()->size_of_parameters()); 266 set_bytecode_1(Bytecodes::_invokeinterface); 267 } 268 269 270 void ConstantPoolCacheEntry::set_method_handle(constantPoolHandle cpool, const CallInfo &call_info) { 271 set_method_handle_common(cpool, Bytecodes::_invokehandle, call_info); 272 } 273 274 void ConstantPoolCacheEntry::set_dynamic_call(constantPoolHandle cpool, const CallInfo &call_info) { 275 set_method_handle_common(cpool, Bytecodes::_invokedynamic, call_info); 276 } 277 278 void ConstantPoolCacheEntry::set_method_handle_common(constantPoolHandle cpool, 279 Bytecodes::Code invoke_code, 280 const CallInfo &call_info) { 281 // NOTE: This CPCE can be the subject of data races. 282 // There are three words to update: flags, refs[f2], f1 (in that order). 283 // Writers must store all other values before f1. 284 // Readers must test f1 first for non-null before reading other fields. 285 // Competing writers must acquire exclusive access via a lock. 286 // A losing writer waits on the lock until the winner writes f1 and leaves 287 // the lock, so that when the losing writer returns, he can use the linked 288 // cache entry. 289 290 objArrayHandle resolved_references = cpool->resolved_references(); 291 // Use the resolved_references() lock for this cpCache entry. 292 // resolved_references are created for all classes with Invokedynamic, MethodHandle 293 // or MethodType constant pool cache entries. 294 assert(resolved_references() != NULL, 295 "a resolved_references array should have been created for this class"); 296 ObjectLocker ol(resolved_references, Thread::current()); 297 if (!is_f1_null()) { 298 return; 299 } 300 301 const methodHandle adapter = call_info.resolved_method(); 302 const Handle appendix = call_info.resolved_appendix(); 303 const Handle method_type = call_info.resolved_method_type(); 304 const bool has_appendix = appendix.not_null(); 305 const bool has_method_type = method_type.not_null(); 306 307 // Write the flags. 308 set_method_flags(as_TosState(adapter->result_type()), 309 ((has_appendix ? 1 : 0) << has_appendix_shift ) | 310 ((has_method_type ? 1 : 0) << has_method_type_shift) | 311 ( 1 << is_final_shift ), 312 adapter->size_of_parameters()); 313 314 if (TraceInvokeDynamic) { 315 tty->print_cr("set_method_handle bc=%d appendix="PTR_FORMAT"%s method_type="PTR_FORMAT"%s method="PTR_FORMAT" ", 316 invoke_code, 317 (void *)appendix(), (has_appendix ? "" : " (unused)"), 318 (void *)method_type(), (has_method_type ? "" : " (unused)"), 319 (intptr_t)adapter()); 320 adapter->print(); 321 if (has_appendix) appendix()->print(); 322 } 323 324 // Method handle invokes and invokedynamic sites use both cp cache words. 325 // refs[f2], if not null, contains a value passed as a trailing argument to the adapter. 326 // In the general case, this could be the call site's MethodType, 327 // for use with java.lang.Invokers.checkExactType, or else a CallSite object. 328 // f1 contains the adapter method which manages the actual call. 329 // In the general case, this is a compiled LambdaForm. 330 // (The Java code is free to optimize these calls by binding other 331 // sorts of methods and appendices to call sites.) 332 // JVM-level linking is via f1, as if for invokespecial, and signatures are erased. 333 // The appendix argument (if any) is added to the signature, and is counted in the parameter_size bits. 334 // Even with the appendix, the method will never take more than 255 parameter slots. 335 // 336 // This means that given a call site like (List)mh.invoke("foo"), 337 // the f1 method has signature '(Ljl/Object;Ljl/invoke/MethodType;)Ljl/Object;', 338 // not '(Ljava/lang/String;)Ljava/util/List;'. 339 // The fact that String and List are involved is encoded in the MethodType in refs[f2]. 340 // This allows us to create fewer Methods, while keeping type safety. 341 // 342 343 // Store appendix, if any. 344 if (has_appendix) { 345 const int appendix_index = f2_as_index() + _indy_resolved_references_appendix_offset; 346 assert(appendix_index >= 0 && appendix_index < resolved_references->length(), "oob"); 347 assert(resolved_references->obj_at(appendix_index) == NULL, "init just once"); 348 resolved_references->obj_at_put(appendix_index, appendix()); 349 } 350 351 // Store MethodType, if any. 352 if (has_method_type) { 353 const int method_type_index = f2_as_index() + _indy_resolved_references_method_type_offset; 354 assert(method_type_index >= 0 && method_type_index < resolved_references->length(), "oob"); 355 assert(resolved_references->obj_at(method_type_index) == NULL, "init just once"); 356 resolved_references->obj_at_put(method_type_index, method_type()); 357 } 358 359 release_set_f1(adapter()); // This must be the last one to set (see NOTE above)! 360 361 // The interpreter assembly code does not check byte_2, 362 // but it is used by is_resolved, method_if_resolved, etc. 363 set_bytecode_1(invoke_code); 364 NOT_PRODUCT(verify(tty)); 365 if (TraceInvokeDynamic) { 366 this->print(tty, 0); 367 } 368 } 369 370 Method* ConstantPoolCacheEntry::method_if_resolved(constantPoolHandle cpool) { 371 // Decode the action of set_method and set_interface_call 372 Bytecodes::Code invoke_code = bytecode_1(); 373 if (invoke_code != (Bytecodes::Code)0) { 374 Metadata* f1 = f1_ord(); 375 if (f1 != NULL) { 376 switch (invoke_code) { 377 case Bytecodes::_invokeinterface: 378 assert(f1->is_klass(), ""); 379 return klassItable::method_for_itable_index((Klass*)f1, f2_as_index()); 380 case Bytecodes::_invokestatic: 381 case Bytecodes::_invokespecial: 382 assert(!has_appendix(), ""); 383 case Bytecodes::_invokehandle: 384 case Bytecodes::_invokedynamic: 385 assert(f1->is_method(), ""); 386 return (Method*)f1; 387 } 388 } 389 } 390 invoke_code = bytecode_2(); 391 if (invoke_code != (Bytecodes::Code)0) { 392 switch (invoke_code) { 393 case Bytecodes::_invokevirtual: 394 if (is_vfinal()) { 395 // invokevirtual 396 Method* m = f2_as_vfinal_method(); 397 assert(m->is_method(), ""); 398 return m; 399 } else { 400 int holder_index = cpool->uncached_klass_ref_index_at(constant_pool_index()); 401 if (cpool->tag_at(holder_index).is_klass()) { 402 Klass* klass = cpool->resolved_klass_at(holder_index); 403 if (!klass->oop_is_instance()) 404 klass = SystemDictionary::Object_klass(); 405 return InstanceKlass::cast(klass)->method_at_vtable(f2_as_index()); 406 } 407 } 408 break; 409 } 410 } 411 return NULL; 412 } 413 414 415 oop ConstantPoolCacheEntry::appendix_if_resolved(constantPoolHandle cpool) { 416 if (!has_appendix()) 417 return NULL; 418 const int ref_index = f2_as_index() + _indy_resolved_references_appendix_offset; 419 objArrayOop resolved_references = cpool->resolved_references(); 420 return resolved_references->obj_at(ref_index); 421 } 422 423 424 oop ConstantPoolCacheEntry::method_type_if_resolved(constantPoolHandle cpool) { 425 if (!has_method_type()) 426 return NULL; 427 const int ref_index = f2_as_index() + _indy_resolved_references_method_type_offset; 428 objArrayOop resolved_references = cpool->resolved_references(); 429 return resolved_references->obj_at(ref_index); 430 } 431 432 433 #if INCLUDE_JVMTI 434 // RedefineClasses() API support: 435 // If this ConstantPoolCacheEntry refers to old_method then update it 436 // to refer to new_method. 437 bool ConstantPoolCacheEntry::adjust_method_entry(Method* old_method, 438 Method* new_method, bool * trace_name_printed) { 439 440 if (is_vfinal()) { 441 // virtual and final so _f2 contains method ptr instead of vtable index 442 if (f2_as_vfinal_method() == old_method) { 443 // match old_method so need an update 444 // NOTE: can't use set_f2_as_vfinal_method as it asserts on different values 445 _f2 = (intptr_t)new_method; 446 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 447 if (!(*trace_name_printed)) { 448 // RC_TRACE_MESG macro has an embedded ResourceMark 449 RC_TRACE_MESG(("adjust: name=%s", 450 old_method->method_holder()->external_name())); 451 *trace_name_printed = true; 452 } 453 // RC_TRACE macro has an embedded ResourceMark 454 RC_TRACE(0x00400000, ("cpc vf-entry update: %s(%s)", 455 new_method->name()->as_C_string(), 456 new_method->signature()->as_C_string())); 457 } 458 459 return true; 460 } 461 462 // f1() is not used with virtual entries so bail out 463 return false; 464 } 465 466 if (_f1 == NULL) { 467 // NULL f1() means this is a virtual entry so bail out 468 // We are assuming that the vtable index does not need change. 469 return false; 470 } 471 472 if (_f1 == old_method) { 473 _f1 = new_method; 474 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) { 475 if (!(*trace_name_printed)) { 476 // RC_TRACE_MESG macro has an embedded ResourceMark 477 RC_TRACE_MESG(("adjust: name=%s", 478 old_method->method_holder()->external_name())); 479 *trace_name_printed = true; 480 } 481 // RC_TRACE macro has an embedded ResourceMark 482 RC_TRACE(0x00400000, ("cpc entry update: %s(%s)", 483 new_method->name()->as_C_string(), 484 new_method->signature()->as_C_string())); 485 } 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 bool ConstantPoolCacheEntry::is_interesting_method_entry(Klass* k) { 514 if (!is_method_entry()) { 515 // not a method entry so not interesting by default 516 return false; 517 } 518 519 Method* m = NULL; 520 if (is_vfinal()) { 521 // virtual and final so _f2 contains method ptr instead of vtable index 522 m = f2_as_vfinal_method(); 523 } else if (is_f1_null()) { 524 // NULL _f1 means this is a virtual entry so also not interesting 525 return false; 526 } else { 527 if (!(_f1->is_method())) { 528 // _f1 can also contain a Klass* for an interface 529 return false; 530 } 531 m = f1_as_method(); 532 } 533 534 assert(m != NULL && m->is_method(), "sanity check"); 535 if (m == NULL || !m->is_method() || (k != NULL && m->method_holder() != k)) { 536 // robustness for above sanity checks or method is not in 537 // the interesting class 538 return false; 539 } 540 541 // the method is in the interesting class so the entry is interesting 542 return true; 543 } 544 #endif // INCLUDE_JVMTI 545 546 void ConstantPoolCacheEntry::print(outputStream* st, int index) const { 547 // print separator 548 if (index == 0) st->print_cr(" -------------"); 549 // print entry 550 st->print("%3d ("PTR_FORMAT") ", index, (intptr_t)this); 551 st->print_cr("[%02x|%02x|%5d]", bytecode_2(), bytecode_1(), 552 constant_pool_index()); 553 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f1); 554 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_f2); 555 st->print_cr(" [ "PTR_FORMAT"]", (intptr_t)_flags); 556 st->print_cr(" -------------"); 557 } 558 559 void ConstantPoolCacheEntry::verify(outputStream* st) const { 560 // not implemented yet 561 } 562 563 // Implementation of ConstantPoolCache 564 565 ConstantPoolCache* ConstantPoolCache::allocate(ClassLoaderData* loader_data, 566 const intStack& index_map, 567 const intStack& invokedynamic_index_map, 568 const intStack& invokedynamic_map, TRAPS) { 569 570 const int length = index_map.length() + invokedynamic_index_map.length(); 571 int size = ConstantPoolCache::size(length); 572 573 return new (loader_data, size, false, MetaspaceObj::ConstantPoolCacheType, THREAD) 574 ConstantPoolCache(length, index_map, invokedynamic_index_map, invokedynamic_map); 575 } 576 577 void ConstantPoolCache::initialize(const intArray& inverse_index_map, 578 const intArray& invokedynamic_inverse_index_map, 579 const intArray& invokedynamic_references_map) { 580 for (int i = 0; i < inverse_index_map.length(); i++) { 581 ConstantPoolCacheEntry* e = entry_at(i); 582 int original_index = inverse_index_map[i]; 583 e->initialize_entry(original_index); 584 assert(entry_at(i) == e, "sanity"); 585 } 586 587 // Append invokedynamic entries at the end 588 int invokedynamic_offset = inverse_index_map.length(); 589 for (int i = 0; i < invokedynamic_inverse_index_map.length(); i++) { 590 int offset = i + invokedynamic_offset; 591 ConstantPoolCacheEntry* e = entry_at(offset); 592 int original_index = invokedynamic_inverse_index_map[i]; 593 e->initialize_entry(original_index); 594 assert(entry_at(offset) == e, "sanity"); 595 } 596 597 for (int ref = 0; ref < invokedynamic_references_map.length(); ref++) { 598 const int cpci = invokedynamic_references_map[ref]; 599 if (cpci >= 0) { 600 #ifdef ASSERT 601 // invokedynamic and invokehandle have more entries; check if they 602 // all point to the same constant pool cache entry. 603 for (int entry = 1; entry < ConstantPoolCacheEntry::_indy_resolved_references_entries; entry++) { 604 const int cpci_next = invokedynamic_references_map[ref + entry]; 605 assert(cpci == cpci_next, err_msg_res("%d == %d", cpci, cpci_next)); 606 } 607 #endif 608 entry_at(cpci)->initialize_resolved_reference_index(ref); 609 ref += ConstantPoolCacheEntry::_indy_resolved_references_entries - 1; // skip extra entries 610 } 611 } 612 } 613 614 #if INCLUDE_JVMTI 615 // RedefineClasses() API support: 616 // If any entry of this ConstantPoolCache points to any of 617 // old_methods, replace it with the corresponding new_method. 618 void ConstantPoolCache::adjust_method_entries(Method** old_methods, Method** new_methods, 619 int methods_length, bool * trace_name_printed) { 620 621 if (methods_length == 0) { 622 // nothing to do if there are no methods 623 return; 624 } 625 626 // get shorthand for the interesting class 627 Klass* old_holder = old_methods[0]->method_holder(); 628 629 for (int i = 0; i < length(); i++) { 630 if (!entry_at(i)->is_interesting_method_entry(old_holder)) { 631 // skip uninteresting methods 632 continue; 633 } 634 635 // The ConstantPoolCache contains entries for several different 636 // things, but we only care about methods. In fact, we only care 637 // about methods in the same class as the one that contains the 638 // old_methods. At this point, we have an interesting entry. 639 640 for (int j = 0; j < methods_length; j++) { 641 Method* old_method = old_methods[j]; 642 Method* new_method = new_methods[j]; 643 644 if (entry_at(i)->adjust_method_entry(old_method, new_method, 645 trace_name_printed)) { 646 // current old_method matched this entry and we updated it so 647 // break out and get to the next interesting entry if there one 648 break; 649 } 650 } 651 } 652 } 653 654 // the constant pool cache should never contain old or obsolete methods 655 bool ConstantPoolCache::check_no_old_or_obsolete_entries() { 656 for (int i = 1; i < length(); i++) { 657 if (entry_at(i)->is_interesting_method_entry(NULL) && 658 !entry_at(i)->check_no_old_or_obsolete_entries()) { 659 return false; 660 } 661 } 662 return true; 663 } 664 665 void ConstantPoolCache::dump_cache() { 666 for (int i = 1; i < length(); i++) { 667 if (entry_at(i)->is_interesting_method_entry(NULL)) { 668 entry_at(i)->print(tty, i); 669 } 670 } 671 } 672 #endif // INCLUDE_JVMTI 673 674 675 // Printing 676 677 void ConstantPoolCache::print_on(outputStream* st) const { 678 assert(is_constantPoolCache(), "obj must be constant pool cache"); 679 st->print_cr("%s", internal_name()); 680 // print constant pool cache entries 681 for (int i = 0; i < length(); i++) entry_at(i)->print(st, i); 682 } 683 684 void ConstantPoolCache::print_value_on(outputStream* st) const { 685 assert(is_constantPoolCache(), "obj must be constant pool cache"); 686 st->print("cache [%d]", length()); 687 print_address_on(st); 688 st->print(" for "); 689 constant_pool()->print_value_on(st); 690 } 691 692 693 // Verification 694 695 void ConstantPoolCache::verify_on(outputStream* st) { 696 guarantee(is_constantPoolCache(), "obj must be constant pool cache"); 697 // print constant pool cache entries 698 for (int i = 0; i < length(); i++) entry_at(i)->verify(st); 699 }