1 /* 2 * Copyright (c) 1998, 2020, 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 "code/codeBlob.hpp" 27 #include "code/codeCache.hpp" 28 #include "code/nmethod.hpp" 29 #include "code/scopeDesc.hpp" 30 #include "compiler/oopMap.hpp" 31 #include "gc/shared/collectedHeap.hpp" 32 #include "memory/allocation.inline.hpp" 33 #include "memory/iterator.hpp" 34 #include "memory/resourceArea.hpp" 35 #include "memory/universe.hpp" 36 #include "oops/compressedOops.hpp" 37 #include "runtime/frame.inline.hpp" 38 #include "runtime/handles.inline.hpp" 39 #include "runtime/signature.hpp" 40 #include "utilities/align.hpp" 41 #include "utilities/lockFreeStack.hpp" 42 #ifdef COMPILER1 43 #include "c1/c1_Defs.hpp" 44 #endif 45 #ifdef COMPILER2 46 #include "opto/optoreg.hpp" 47 #endif 48 49 // OopMapStream 50 51 OopMapStream::OopMapStream(OopMap* oop_map) { 52 _stream = new CompressedReadStream(oop_map->write_stream()->buffer()); 53 _size = oop_map->omv_count(); 54 _position = 0; 55 _valid_omv = false; 56 } 57 58 OopMapStream::OopMapStream(const ImmutableOopMap* oop_map) { 59 _stream = new CompressedReadStream(oop_map->data_addr()); 60 _size = oop_map->count(); 61 _position = 0; 62 _valid_omv = false; 63 } 64 65 void OopMapStream::find_next() { 66 if (_position++ < _size) { 67 _omv.read_from(_stream); 68 _valid_omv = true; 69 return; 70 } 71 _valid_omv = false; 72 } 73 74 75 // OopMap 76 77 // frame_size units are stack-slots (4 bytes) NOT intptr_t; we can name odd 78 // slots to hold 4-byte values like ints and floats in the LP64 build. 79 OopMap::OopMap(int frame_size, int arg_count) { 80 // OopMaps are usually quite so small, so pick a small initial size 81 set_write_stream(new CompressedWriteStream(32)); 82 set_omv_count(0); 83 84 #ifdef ASSERT 85 _locs_length = VMRegImpl::stack2reg(0)->value() + frame_size + arg_count; 86 _locs_used = NEW_RESOURCE_ARRAY(OopMapValue::oop_types, _locs_length); 87 for(int i = 0; i < _locs_length; i++) _locs_used[i] = OopMapValue::unused_value; 88 #endif 89 } 90 91 92 OopMap::OopMap(OopMap::DeepCopyToken, OopMap* source) { 93 // This constructor does a deep copy 94 // of the source OopMap. 95 set_write_stream(new CompressedWriteStream(source->omv_count() * 2)); 96 set_omv_count(0); 97 set_offset(source->offset()); 98 99 #ifdef ASSERT 100 _locs_length = source->_locs_length; 101 _locs_used = NEW_RESOURCE_ARRAY(OopMapValue::oop_types, _locs_length); 102 for(int i = 0; i < _locs_length; i++) _locs_used[i] = OopMapValue::unused_value; 103 #endif 104 105 // We need to copy the entries too. 106 for (OopMapStream oms(source); !oms.is_done(); oms.next()) { 107 OopMapValue omv = oms.current(); 108 omv.write_on(write_stream()); 109 increment_count(); 110 } 111 } 112 113 114 OopMap* OopMap::deep_copy() { 115 return new OopMap(_deep_copy_token, this); 116 } 117 118 void OopMap::copy_data_to(address addr) const { 119 memcpy(addr, write_stream()->buffer(), write_stream()->position()); 120 } 121 122 int OopMap::heap_size() const { 123 int size = sizeof(OopMap); 124 int align = sizeof(void *) - 1; 125 size += write_stream()->position(); 126 // Align to a reasonable ending point 127 size = ((size+align) & ~align); 128 return size; 129 } 130 131 // frame_size units are stack-slots (4 bytes) NOT intptr_t; we can name odd 132 // slots to hold 4-byte values like ints and floats in the LP64 build. 133 void OopMap::set_xxx(VMReg reg, OopMapValue::oop_types x, VMReg optional) { 134 135 assert(reg->value() < _locs_length, "too big reg value for stack size"); 136 assert( _locs_used[reg->value()] == OopMapValue::unused_value, "cannot insert twice" ); 137 debug_only( _locs_used[reg->value()] = x; ) 138 139 OopMapValue o(reg, x, optional); 140 o.write_on(write_stream()); 141 increment_count(); 142 } 143 144 145 void OopMap::set_oop(VMReg reg) { 146 set_xxx(reg, OopMapValue::oop_value, VMRegImpl::Bad()); 147 } 148 149 150 void OopMap::set_narrowoop(VMReg reg) { 151 set_xxx(reg, OopMapValue::narrowoop_value, VMRegImpl::Bad()); 152 } 153 154 155 void OopMap::set_callee_saved(VMReg reg, VMReg caller_machine_register ) { 156 set_xxx(reg, OopMapValue::callee_saved_value, caller_machine_register); 157 } 158 159 160 void OopMap::set_derived_oop(VMReg reg, VMReg derived_from_local_register ) { 161 if( reg == derived_from_local_register ) { 162 // Actually an oop, derived shares storage with base, 163 set_oop(reg); 164 } else { 165 set_xxx(reg, OopMapValue::derived_oop_value, derived_from_local_register); 166 } 167 } 168 169 // OopMapSet 170 171 OopMapSet::OopMapSet() : _list(MinOopMapAllocation) {} 172 173 void OopMapSet::add_gc_map(int pc_offset, OopMap *map ) { 174 map->set_offset(pc_offset); 175 176 #ifdef ASSERT 177 if(_list.length() > 0) { 178 OopMap* last = _list.last(); 179 if (last->offset() == map->offset() ) { 180 fatal("OopMap inserted twice"); 181 } 182 if (last->offset() > map->offset()) { 183 tty->print_cr( "WARNING, maps not sorted: pc[%d]=%d, pc[%d]=%d", 184 _list.length(),last->offset(),_list.length()+1,map->offset()); 185 } 186 } 187 #endif // ASSERT 188 189 add(map); 190 } 191 192 static void add_derived_oop(oop* base, oop* derived) { 193 #if !defined(TIERED) && !INCLUDE_JVMCI 194 COMPILER1_PRESENT(ShouldNotReachHere();) 195 #endif // !defined(TIERED) && !INCLUDE_JVMCI 196 #if COMPILER2_OR_JVMCI 197 DerivedPointerTable::add(derived, base); 198 #endif // COMPILER2_OR_JVMCI 199 } 200 201 202 #ifndef PRODUCT 203 static void trace_codeblob_maps(const frame *fr, const RegisterMap *reg_map) { 204 // Print oopmap and regmap 205 tty->print_cr("------ "); 206 CodeBlob* cb = fr->cb(); 207 const ImmutableOopMapSet* maps = cb->oop_maps(); 208 const ImmutableOopMap* map = cb->oop_map_for_return_address(fr->pc()); 209 map->print(); 210 if( cb->is_nmethod() ) { 211 nmethod* nm = (nmethod*)cb; 212 // native wrappers have no scope data, it is implied 213 if (nm->is_native_method()) { 214 tty->print("bci: 0 (native)"); 215 } else { 216 ScopeDesc* scope = nm->scope_desc_at(fr->pc()); 217 tty->print("bci: %d ",scope->bci()); 218 } 219 } 220 tty->cr(); 221 fr->print_on(tty); 222 tty->print(" "); 223 cb->print_value_on(tty); tty->cr(); 224 reg_map->print(); 225 tty->print_cr("------ "); 226 227 } 228 #endif // PRODUCT 229 230 void OopMapSet::oops_do(const frame *fr, const RegisterMap* reg_map, OopClosure* f) { 231 // add derived oops to a table 232 all_do(fr, reg_map, f, add_derived_oop, &do_nothing_cl); 233 } 234 235 236 void OopMapSet::all_do(const frame *fr, const RegisterMap *reg_map, 237 OopClosure* oop_fn, void derived_oop_fn(oop*, oop*), 238 OopClosure* value_fn) { 239 CodeBlob* cb = fr->cb(); 240 assert(cb != NULL, "no codeblob"); 241 242 NOT_PRODUCT(if (TraceCodeBlobStacks) trace_codeblob_maps(fr, reg_map);) 243 244 const ImmutableOopMap* map = cb->oop_map_for_return_address(fr->pc()); 245 assert(map != NULL, "no ptr map found"); 246 247 // handle derived pointers first (otherwise base pointer may be 248 // changed before derived pointer offset has been collected) 249 { 250 for (OopMapStream oms(map); !oms.is_done(); oms.next()) { 251 OopMapValue omv = oms.current(); 252 if (omv.type() != OopMapValue::derived_oop_value) { 253 continue; 254 } 255 256 #ifndef TIERED 257 COMPILER1_PRESENT(ShouldNotReachHere();) 258 #if INCLUDE_JVMCI 259 if (UseJVMCICompiler) { 260 ShouldNotReachHere(); 261 } 262 #endif 263 #endif // !TIERED 264 oop* loc = fr->oopmapreg_to_location(omv.reg(),reg_map); 265 guarantee(loc != NULL, "missing saved register"); 266 oop *derived_loc = loc; 267 oop *base_loc = fr->oopmapreg_to_location(omv.content_reg(), reg_map); 268 // Ignore NULL oops and decoded NULL narrow oops which 269 // equal to CompressedOops::base() when a narrow oop 270 // implicit null check is used in compiled code. 271 // The narrow_oop_base could be NULL or be the address 272 // of the page below heap depending on compressed oops mode. 273 if (base_loc != NULL && *base_loc != NULL && !CompressedOops::is_base(*base_loc)) { 274 derived_oop_fn(base_loc, derived_loc); 275 } 276 } 277 } 278 279 { 280 // We want coop and oop oop_types 281 for (OopMapStream oms(map); !oms.is_done(); oms.next()) { 282 OopMapValue omv = oms.current(); 283 oop* loc = fr->oopmapreg_to_location(omv.reg(),reg_map); 284 // It should be an error if no location can be found for a 285 // register mentioned as contained an oop of some kind. Maybe 286 // this was allowed previously because value_value items might 287 // be missing? 288 guarantee(loc != NULL, "missing saved register"); 289 if ( omv.type() == OopMapValue::oop_value ) { 290 oop val = *loc; 291 if (val == NULL || CompressedOops::is_base(val)) { 292 // Ignore NULL oops and decoded NULL narrow oops which 293 // equal to CompressedOops::base() when a narrow oop 294 // implicit null check is used in compiled code. 295 // The narrow_oop_base could be NULL or be the address 296 // of the page below heap depending on compressed oops mode. 297 continue; 298 } 299 #ifdef ASSERT 300 if ((((uintptr_t)loc & (sizeof(*loc)-1)) != 0) || 301 !Universe::heap()->is_in_or_null(*loc)) { 302 tty->print_cr("# Found non oop pointer. Dumping state at failure"); 303 // try to dump out some helpful debugging information 304 trace_codeblob_maps(fr, reg_map); 305 omv.print(); 306 tty->print_cr("register r"); 307 omv.reg()->print(); 308 tty->print_cr("loc = %p *loc = %p\n", loc, cast_from_oop<address>(*loc)); 309 // do the real assert. 310 assert(Universe::heap()->is_in_or_null(*loc), "found non oop pointer"); 311 } 312 #endif // ASSERT 313 oop_fn->do_oop(loc); 314 } else if ( omv.type() == OopMapValue::narrowoop_value ) { 315 narrowOop *nl = (narrowOop*)loc; 316 #ifndef VM_LITTLE_ENDIAN 317 VMReg vmReg = omv.reg(); 318 if (!vmReg->is_stack()) { 319 // compressed oops in registers only take up 4 bytes of an 320 // 8 byte register but they are in the wrong part of the 321 // word so adjust loc to point at the right place. 322 nl = (narrowOop*)((address)nl + 4); 323 } 324 #endif 325 oop_fn->do_oop(nl); 326 } 327 } 328 } 329 } 330 331 332 // Update callee-saved register info for the following frame 333 void OopMapSet::update_register_map(const frame *fr, RegisterMap *reg_map) { 334 ResourceMark rm; 335 CodeBlob* cb = fr->cb(); 336 assert(cb != NULL, "no codeblob"); 337 338 // Any reg might be saved by a safepoint handler (see generate_handler_blob). 339 assert( reg_map->_update_for_id == NULL || fr->is_older(reg_map->_update_for_id), 340 "already updated this map; do not 'update' it twice!" ); 341 debug_only(reg_map->_update_for_id = fr->id()); 342 343 // Check if caller must update oop argument 344 assert((reg_map->include_argument_oops() || 345 !cb->caller_must_gc_arguments(reg_map->thread())), 346 "include_argument_oops should already be set"); 347 348 // Scan through oopmap and find location of all callee-saved registers 349 // (we do not do update in place, since info could be overwritten) 350 351 address pc = fr->pc(); 352 const ImmutableOopMap* map = cb->oop_map_for_return_address(pc); 353 assert(map != NULL, "no ptr map found"); 354 DEBUG_ONLY(int nof_callee = 0;) 355 356 for (OopMapStream oms(map); !oms.is_done(); oms.next()) { 357 OopMapValue omv = oms.current(); 358 if (omv.type() == OopMapValue::callee_saved_value) { 359 VMReg reg = omv.content_reg(); 360 oop* loc = fr->oopmapreg_to_location(omv.reg(), reg_map); 361 reg_map->set_location(reg, (address) loc); 362 DEBUG_ONLY(nof_callee++;) 363 } 364 } 365 366 // Check that runtime stubs save all callee-saved registers 367 #ifdef COMPILER2 368 assert(cb->is_compiled_by_c1() || cb->is_compiled_by_jvmci() || !cb->is_runtime_stub() || 369 (nof_callee >= SAVED_ON_ENTRY_REG_COUNT || nof_callee >= C_SAVED_ON_ENTRY_REG_COUNT), 370 "must save all"); 371 #endif // COMPILER2 372 } 373 374 // Printing code is present in product build for -XX:+PrintAssembly. 375 376 static 377 void print_register_type(OopMapValue::oop_types x, VMReg optional, 378 outputStream* st) { 379 switch( x ) { 380 case OopMapValue::oop_value: 381 st->print("Oop"); 382 break; 383 case OopMapValue::narrowoop_value: 384 st->print("NarrowOop"); 385 break; 386 case OopMapValue::callee_saved_value: 387 st->print("Callers_"); 388 optional->print_on(st); 389 break; 390 case OopMapValue::derived_oop_value: 391 st->print("Derived_oop_"); 392 optional->print_on(st); 393 break; 394 default: 395 ShouldNotReachHere(); 396 } 397 } 398 399 void OopMapValue::print_on(outputStream* st) const { 400 reg()->print_on(st); 401 st->print("="); 402 print_register_type(type(),content_reg(),st); 403 st->print(" "); 404 } 405 406 void OopMapValue::print() const { print_on(tty); } 407 408 void ImmutableOopMap::print_on(outputStream* st) const { 409 OopMapValue omv; 410 st->print("ImmutableOopMap {"); 411 for(OopMapStream oms(this); !oms.is_done(); oms.next()) { 412 omv = oms.current(); 413 omv.print_on(st); 414 } 415 st->print("}"); 416 } 417 418 void ImmutableOopMap::print() const { print_on(tty); } 419 420 void OopMap::print_on(outputStream* st) const { 421 OopMapValue omv; 422 st->print("OopMap {"); 423 for(OopMapStream oms((OopMap*)this); !oms.is_done(); oms.next()) { 424 omv = oms.current(); 425 omv.print_on(st); 426 } 427 // Print hex offset in addition. 428 st->print("off=%d/0x%x}", (int) offset(), (int) offset()); 429 } 430 431 void OopMap::print() const { print_on(tty); } 432 433 void ImmutableOopMapSet::print_on(outputStream* st) const { 434 const ImmutableOopMap* last = NULL; 435 const int len = count(); 436 437 st->print_cr("ImmutableOopMapSet contains %d OopMaps", len); 438 439 for (int i = 0; i < len; i++) { 440 const ImmutableOopMapPair* pair = pair_at(i); 441 const ImmutableOopMap* map = pair->get_from(this); 442 if (map != last) { 443 st->cr(); 444 map->print_on(st); 445 st->print(" pc offsets: "); 446 } 447 last = map; 448 st->print("%d ", pair->pc_offset()); 449 } 450 st->cr(); 451 } 452 453 void ImmutableOopMapSet::print() const { print_on(tty); } 454 455 void OopMapSet::print_on(outputStream* st) const { 456 const int len = _list.length(); 457 458 st->print_cr("OopMapSet contains %d OopMaps", len); 459 460 for( int i = 0; i < len; i++) { 461 OopMap* m = at(i); 462 st->print_cr("#%d ",i); 463 m->print_on(st); 464 st->cr(); 465 } 466 st->cr(); 467 } 468 469 void OopMapSet::print() const { print_on(tty); } 470 471 bool OopMap::equals(const OopMap* other) const { 472 if (other->_omv_count != _omv_count) { 473 return false; 474 } 475 if (other->write_stream()->position() != write_stream()->position()) { 476 return false; 477 } 478 if (memcmp(other->write_stream()->buffer(), write_stream()->buffer(), write_stream()->position()) != 0) { 479 return false; 480 } 481 return true; 482 } 483 484 const ImmutableOopMap* ImmutableOopMapSet::find_map_at_offset(int pc_offset) const { 485 ImmutableOopMapPair* pairs = get_pairs(); 486 ImmutableOopMapPair* last = NULL; 487 488 for (int i = 0; i < _count; ++i) { 489 if (pairs[i].pc_offset() >= pc_offset) { 490 last = &pairs[i]; 491 break; 492 } 493 } 494 495 // Heal Coverity issue: potential index out of bounds access. 496 guarantee(last != NULL, "last may not be null"); 497 assert(last->pc_offset() == pc_offset, "oopmap not found"); 498 return last->get_from(this); 499 } 500 501 const ImmutableOopMap* ImmutableOopMapPair::get_from(const ImmutableOopMapSet* set) const { 502 return set->oopmap_at_offset(_oopmap_offset); 503 } 504 505 ImmutableOopMap::ImmutableOopMap(const OopMap* oopmap) : _count(oopmap->count()) { 506 address addr = data_addr(); 507 oopmap->copy_data_to(addr); 508 } 509 510 #ifdef ASSERT 511 int ImmutableOopMap::nr_of_bytes() const { 512 OopMapStream oms(this); 513 514 while (!oms.is_done()) { 515 oms.next(); 516 } 517 return sizeof(ImmutableOopMap) + oms.stream_position(); 518 } 519 #endif 520 521 ImmutableOopMapBuilder::ImmutableOopMapBuilder(const OopMapSet* set) : _set(set), _empty(NULL), _last(NULL), _empty_offset(-1), _last_offset(-1), _offset(0), _required(-1), _new_set(NULL) { 522 _mapping = NEW_RESOURCE_ARRAY(Mapping, _set->size()); 523 } 524 525 int ImmutableOopMapBuilder::size_for(const OopMap* map) const { 526 return align_up((int)sizeof(ImmutableOopMap) + map->data_size(), 8); 527 } 528 529 int ImmutableOopMapBuilder::heap_size() { 530 int base = sizeof(ImmutableOopMapSet); 531 base = align_up(base, 8); 532 533 // all of ours pc / offset pairs 534 int pairs = _set->size() * sizeof(ImmutableOopMapPair); 535 pairs = align_up(pairs, 8); 536 537 for (int i = 0; i < _set->size(); ++i) { 538 int size = 0; 539 OopMap* map = _set->at(i); 540 541 if (is_empty(map)) { 542 /* only keep a single empty map in the set */ 543 if (has_empty()) { 544 _mapping[i].set(Mapping::OOPMAP_EMPTY, _empty_offset, 0, map, _empty); 545 } else { 546 _empty_offset = _offset; 547 _empty = map; 548 size = size_for(map); 549 _mapping[i].set(Mapping::OOPMAP_NEW, _offset, size, map); 550 } 551 } else if (is_last_duplicate(map)) { 552 /* if this entry is identical to the previous one, just point it there */ 553 _mapping[i].set(Mapping::OOPMAP_DUPLICATE, _last_offset, 0, map, _last); 554 } else { 555 /* not empty, not an identical copy of the previous entry */ 556 size = size_for(map); 557 _mapping[i].set(Mapping::OOPMAP_NEW, _offset, size, map); 558 _last_offset = _offset; 559 _last = map; 560 } 561 562 assert(_mapping[i]._map == map, "check"); 563 _offset += size; 564 } 565 566 int total = base + pairs + _offset; 567 DEBUG_ONLY(total += 8); 568 _required = total; 569 return total; 570 } 571 572 void ImmutableOopMapBuilder::fill_pair(ImmutableOopMapPair* pair, const OopMap* map, int offset, const ImmutableOopMapSet* set) { 573 assert(offset < set->nr_of_bytes(), "check"); 574 new ((address) pair) ImmutableOopMapPair(map->offset(), offset); 575 } 576 577 int ImmutableOopMapBuilder::fill_map(ImmutableOopMapPair* pair, const OopMap* map, int offset, const ImmutableOopMapSet* set) { 578 fill_pair(pair, map, offset, set); 579 address addr = (address) pair->get_from(_new_set); // location of the ImmutableOopMap 580 581 new (addr) ImmutableOopMap(map); 582 return size_for(map); 583 } 584 585 void ImmutableOopMapBuilder::fill(ImmutableOopMapSet* set, int sz) { 586 ImmutableOopMapPair* pairs = set->get_pairs(); 587 588 for (int i = 0; i < set->count(); ++i) { 589 const OopMap* map = _mapping[i]._map; 590 ImmutableOopMapPair* pair = NULL; 591 int size = 0; 592 593 if (_mapping[i]._kind == Mapping::OOPMAP_NEW) { 594 size = fill_map(&pairs[i], map, _mapping[i]._offset, set); 595 } else if (_mapping[i]._kind == Mapping::OOPMAP_DUPLICATE || _mapping[i]._kind == Mapping::OOPMAP_EMPTY) { 596 fill_pair(&pairs[i], map, _mapping[i]._offset, set); 597 } 598 599 const ImmutableOopMap* nv = set->find_map_at_offset(map->offset()); 600 assert(memcmp(map->data(), nv->data_addr(), map->data_size()) == 0, "check identity"); 601 } 602 } 603 604 #ifdef ASSERT 605 void ImmutableOopMapBuilder::verify(address buffer, int size, const ImmutableOopMapSet* set) { 606 for (int i = 0; i < 8; ++i) { 607 assert(buffer[size - 8 + i] == (unsigned char) 0xff, "overwritten memory check"); 608 } 609 610 for (int i = 0; i < set->count(); ++i) { 611 const ImmutableOopMapPair* pair = set->pair_at(i); 612 assert(pair->oopmap_offset() < set->nr_of_bytes(), "check size"); 613 const ImmutableOopMap* map = pair->get_from(set); 614 int nr_of_bytes = map->nr_of_bytes(); 615 assert(pair->oopmap_offset() + nr_of_bytes <= set->nr_of_bytes(), "check size + size"); 616 } 617 } 618 #endif 619 620 ImmutableOopMapSet* ImmutableOopMapBuilder::generate_into(address buffer) { 621 DEBUG_ONLY(memset(&buffer[_required-8], 0xff, 8)); 622 623 _new_set = new (buffer) ImmutableOopMapSet(_set, _required); 624 fill(_new_set, _required); 625 626 DEBUG_ONLY(verify(buffer, _required, _new_set)); 627 628 return _new_set; 629 } 630 631 ImmutableOopMapSet* ImmutableOopMapBuilder::build() { 632 _required = heap_size(); 633 634 // We need to allocate a chunk big enough to hold the ImmutableOopMapSet and all of its ImmutableOopMaps 635 address buffer = NEW_C_HEAP_ARRAY(unsigned char, _required, mtCode); 636 return generate_into(buffer); 637 } 638 639 ImmutableOopMapSet* ImmutableOopMapSet::build_from(const OopMapSet* oopmap_set) { 640 ResourceMark mark; 641 ImmutableOopMapBuilder builder(oopmap_set); 642 return builder.build(); 643 } 644 645 646 //------------------------------DerivedPointerTable--------------------------- 647 648 #if COMPILER2_OR_JVMCI 649 650 class DerivedPointerTable::Entry : public CHeapObj<mtCompiler> { 651 oop* _location; // Location of derived pointer, also pointing to base 652 intptr_t _offset; // Offset from base pointer 653 Entry* volatile _next; 654 655 static Entry* volatile* next_ptr(Entry& entry) { return &entry._next; } 656 657 public: 658 Entry(oop* location, intptr_t offset) : 659 _location(location), _offset(offset), _next(NULL) {} 660 661 oop* location() const { return _location; } 662 intptr_t offset() const { return _offset; } 663 Entry* next() const { return _next; } 664 665 typedef LockFreeStack<Entry, &next_ptr> List; 666 static List* _list; 667 }; 668 669 DerivedPointerTable::Entry::List* DerivedPointerTable::Entry::_list = NULL; 670 bool DerivedPointerTable::_active = false; 671 672 bool DerivedPointerTable::is_empty() { 673 return Entry::_list == NULL || Entry::_list->empty(); 674 } 675 676 void DerivedPointerTable::clear() { 677 // The first time, we create the list. Otherwise it should be 678 // empty. If not, then we have probably forgotton to call 679 // update_pointers after last GC/Scavenge. 680 assert (!_active, "should not be active"); 681 assert(is_empty(), "table not empty"); 682 if (Entry::_list == NULL) { 683 void* mem = NEW_C_HEAP_OBJ(Entry::List, mtCompiler); 684 Entry::_list = ::new (mem) Entry::List(); 685 } 686 _active = true; 687 } 688 689 // Returns value of location as an int 690 inline intptr_t value_of_loc(oop *pointer) { 691 return cast_from_oop<intptr_t>((*pointer)); 692 } 693 694 void DerivedPointerTable::add(oop *derived_loc, oop *base_loc) { 695 assert(Universe::heap()->is_in_or_null(*base_loc), "not an oop"); 696 assert(derived_loc != base_loc, "Base and derived in same location"); 697 if (_active) { 698 assert(*derived_loc != (void*)base_loc, "location already added"); 699 assert(Entry::_list != NULL, "list must exist"); 700 intptr_t offset = value_of_loc(derived_loc) - value_of_loc(base_loc); 701 // This assert is invalid because derived pointers can be 702 // arbitrarily far away from their base. 703 // assert(offset >= -1000000, "wrong derived pointer info"); 704 705 if (TraceDerivedPointers) { 706 tty->print_cr( 707 "Add derived pointer@" INTPTR_FORMAT 708 " - Derived: " INTPTR_FORMAT 709 " Base: " INTPTR_FORMAT " (@" INTPTR_FORMAT ") (Offset: " INTX_FORMAT ")", 710 p2i(derived_loc), p2i(*derived_loc), p2i(*base_loc), p2i(base_loc), offset 711 ); 712 } 713 // Set derived oop location to point to base. 714 *derived_loc = (oop)base_loc; 715 Entry* entry = new Entry(derived_loc, offset); 716 Entry::_list->push(*entry); 717 } 718 } 719 720 void DerivedPointerTable::update_pointers() { 721 assert(Entry::_list != NULL, "list must exist"); 722 Entry* entries = Entry::_list->pop_all(); 723 while (entries != NULL) { 724 Entry* entry = entries; 725 entries = entry->next(); 726 oop* derived_loc = entry->location(); 727 intptr_t offset = entry->offset(); 728 // The derived oop was setup to point to location of base 729 oop base = **(oop**)derived_loc; 730 assert(Universe::heap()->is_in_or_null(base), "must be an oop"); 731 732 *derived_loc = (oop)(cast_from_oop<address>(base) + offset); 733 assert(value_of_loc(derived_loc) - value_of_loc(&base) == offset, "sanity check"); 734 735 if (TraceDerivedPointers) { 736 tty->print_cr("Updating derived pointer@" INTPTR_FORMAT 737 " - Derived: " INTPTR_FORMAT " Base: " INTPTR_FORMAT " (Offset: " INTX_FORMAT ")", 738 p2i(derived_loc), p2i(*derived_loc), p2i(base), offset); 739 } 740 741 // Delete entry 742 delete entry; 743 } 744 assert(Entry::_list->empty(), "invariant"); 745 _active = false; 746 } 747 748 #endif // COMPILER2_OR_JVMCI