1 /* 2 * Copyright (c) 1997, 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 "code/codeCache.hpp" 27 #include "code/compiledIC.hpp" 28 #include "code/nmethod.hpp" 29 #include "code/relocInfo.hpp" 30 #include "memory/resourceArea.hpp" 31 #include "oops/compressedOops.inline.hpp" 32 #include "runtime/stubCodeGenerator.hpp" 33 #include "utilities/copy.hpp" 34 #include "oops/oop.inline.hpp" 35 36 const RelocationHolder RelocationHolder::none; // its type is relocInfo::none 37 38 39 // Implementation of relocInfo 40 41 #ifdef ASSERT 42 relocInfo::relocInfo(relocType t, int off, int f) { 43 assert(t != data_prefix_tag, "cannot build a prefix this way"); 44 assert((t & type_mask) == t, "wrong type"); 45 assert((f & format_mask) == f, "wrong format"); 46 assert(off >= 0 && off < offset_limit(), "offset out off bounds"); 47 assert((off & (offset_unit-1)) == 0, "misaligned offset"); 48 (*this) = relocInfo(t, RAW_BITS, off, f); 49 } 50 #endif 51 52 void relocInfo::initialize(CodeSection* dest, Relocation* reloc) { 53 relocInfo* data = this+1; // here's where the data might go 54 dest->set_locs_end(data); // sync end: the next call may read dest.locs_end 55 reloc->pack_data_to(dest); // maybe write data into locs, advancing locs_end 56 relocInfo* data_limit = dest->locs_end(); 57 if (data_limit > data) { 58 relocInfo suffix = (*this); 59 data_limit = this->finish_prefix((short*) data_limit); 60 // Finish up with the suffix. (Hack note: pack_data_to might edit this.) 61 *data_limit = suffix; 62 dest->set_locs_end(data_limit+1); 63 } 64 } 65 66 relocInfo* relocInfo::finish_prefix(short* prefix_limit) { 67 assert(sizeof(relocInfo) == sizeof(short), "change this code"); 68 short* p = (short*)(this+1); 69 assert(prefix_limit >= p, "must be a valid span of data"); 70 int plen = prefix_limit - p; 71 if (plen == 0) { 72 debug_only(_value = 0xFFFF); 73 return this; // no data: remove self completely 74 } 75 if (plen == 1 && fits_into_immediate(p[0])) { 76 (*this) = immediate_relocInfo(p[0]); // move data inside self 77 return this+1; 78 } 79 // cannot compact, so just update the count and return the limit pointer 80 (*this) = prefix_relocInfo(plen); // write new datalen 81 assert(data() + datalen() == prefix_limit, "pointers must line up"); 82 return (relocInfo*)prefix_limit; 83 } 84 85 void relocInfo::set_type(relocType t) { 86 int old_offset = addr_offset(); 87 int old_format = format(); 88 (*this) = relocInfo(t, old_offset, old_format); 89 assert(type()==(int)t, "sanity check"); 90 assert(addr_offset()==old_offset, "sanity check"); 91 assert(format()==old_format, "sanity check"); 92 } 93 94 nmethod* RelocIterator::code_as_nmethod() const { 95 return _code->as_nmethod(); 96 } 97 98 void relocInfo::set_format(int f) { 99 int old_offset = addr_offset(); 100 assert((f & format_mask) == f, "wrong format"); 101 _value = (_value & ~(format_mask << offset_width)) | (f << offset_width); 102 assert(addr_offset()==old_offset, "sanity check"); 103 } 104 105 106 void relocInfo::change_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type, relocType new_type) { 107 bool found = false; 108 while (itr->next() && !found) { 109 if (itr->addr() == pc) { 110 assert(itr->type()==old_type, "wrong relocInfo type found"); 111 itr->current()->set_type(new_type); 112 found=true; 113 } 114 } 115 assert(found, "no relocInfo found for pc"); 116 } 117 118 119 void relocInfo::remove_reloc_info_for_address(RelocIterator *itr, address pc, relocType old_type) { 120 change_reloc_info_for_address(itr, pc, old_type, none); 121 } 122 123 124 // ---------------------------------------------------------------------------------------------------- 125 // Implementation of RelocIterator 126 127 void RelocIterator::initialize(CompiledMethod* nm, address begin, address limit) { 128 initialize_misc(); 129 130 if (nm == NULL && begin != NULL) { 131 // allow nmethod to be deduced from beginning address 132 CodeBlob* cb = CodeCache::find_blob(begin); 133 nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL; 134 } 135 guarantee(nm != NULL, "must be able to deduce nmethod from other arguments"); 136 137 _code = nm; 138 _current = nm->relocation_begin() - 1; 139 _end = nm->relocation_end(); 140 _addr = nm->content_begin(); 141 142 // Initialize code sections. 143 _section_start[CodeBuffer::SECT_CONSTS] = nm->consts_begin(); 144 _section_start[CodeBuffer::SECT_INSTS ] = nm->insts_begin() ; 145 _section_start[CodeBuffer::SECT_STUBS ] = nm->stub_begin() ; 146 147 _section_end [CodeBuffer::SECT_CONSTS] = nm->consts_end() ; 148 _section_end [CodeBuffer::SECT_INSTS ] = nm->insts_end() ; 149 _section_end [CodeBuffer::SECT_STUBS ] = nm->stub_end() ; 150 151 assert(!has_current(), "just checking"); 152 assert(begin == NULL || begin >= nm->code_begin(), "in bounds"); 153 assert(limit == NULL || limit <= nm->code_end(), "in bounds"); 154 set_limits(begin, limit); 155 } 156 157 158 RelocIterator::RelocIterator(CodeSection* cs, address begin, address limit) { 159 initialize_misc(); 160 161 _current = cs->locs_start()-1; 162 _end = cs->locs_end(); 163 _addr = cs->start(); 164 _code = NULL; // Not cb->blob(); 165 166 CodeBuffer* cb = cs->outer(); 167 assert((int) SECT_LIMIT == CodeBuffer::SECT_LIMIT, "my copy must be equal"); 168 for (int n = (int) CodeBuffer::SECT_FIRST; n < (int) CodeBuffer::SECT_LIMIT; n++) { 169 CodeSection* cs = cb->code_section(n); 170 _section_start[n] = cs->start(); 171 _section_end [n] = cs->end(); 172 } 173 174 assert(!has_current(), "just checking"); 175 176 assert(begin == NULL || begin >= cs->start(), "in bounds"); 177 assert(limit == NULL || limit <= cs->end(), "in bounds"); 178 set_limits(begin, limit); 179 } 180 181 182 enum { indexCardSize = 128 }; 183 struct RelocIndexEntry { 184 jint addr_offset; // offset from header_end of an addr() 185 jint reloc_offset; // offset from header_end of a relocInfo (prefix) 186 }; 187 188 189 bool RelocIterator::addr_in_const() const { 190 const int n = CodeBuffer::SECT_CONSTS; 191 return section_start(n) <= addr() && addr() < section_end(n); 192 } 193 194 195 void RelocIterator::set_limits(address begin, address limit) { 196 _limit = limit; 197 198 // the limit affects this next stuff: 199 if (begin != NULL) { 200 relocInfo* backup; 201 address backup_addr; 202 while (true) { 203 backup = _current; 204 backup_addr = _addr; 205 if (!next() || addr() >= begin) break; 206 } 207 // At this point, either we are at the first matching record, 208 // or else there is no such record, and !has_current(). 209 // In either case, revert to the immediatly preceding state. 210 _current = backup; 211 _addr = backup_addr; 212 set_has_current(false); 213 } 214 } 215 216 217 void RelocIterator::set_limit(address limit) { 218 address code_end = (address)code() + code()->size(); 219 assert(limit == NULL || limit <= code_end, "in bounds"); 220 _limit = limit; 221 } 222 223 // All the strange bit-encodings are in here. 224 // The idea is to encode relocation data which are small integers 225 // very efficiently (a single extra halfword). Larger chunks of 226 // relocation data need a halfword header to hold their size. 227 void RelocIterator::advance_over_prefix() { 228 if (_current->is_datalen()) { 229 _data = (short*) _current->data(); 230 _datalen = _current->datalen(); 231 _current += _datalen + 1; // skip the embedded data & header 232 } else { 233 _databuf = _current->immediate(); 234 _data = &_databuf; 235 _datalen = 1; 236 _current++; // skip the header 237 } 238 // The client will see the following relocInfo, whatever that is. 239 // It is the reloc to which the preceding data applies. 240 } 241 242 243 void RelocIterator::initialize_misc() { 244 set_has_current(false); 245 for (int i = (int) CodeBuffer::SECT_FIRST; i < (int) CodeBuffer::SECT_LIMIT; i++) { 246 _section_start[i] = NULL; // these will be lazily computed, if needed 247 _section_end [i] = NULL; 248 } 249 } 250 251 252 Relocation* RelocIterator::reloc() { 253 // (take the "switch" out-of-line) 254 relocInfo::relocType t = type(); 255 if (false) {} 256 #define EACH_TYPE(name) \ 257 else if (t == relocInfo::name##_type) { \ 258 return name##_reloc(); \ 259 } 260 APPLY_TO_RELOCATIONS(EACH_TYPE); 261 #undef EACH_TYPE 262 assert(t == relocInfo::none, "must be padding"); 263 return new(_rh) Relocation(); 264 } 265 266 267 //////// Methods for flyweight Relocation types 268 269 270 RelocationHolder RelocationHolder::plus(int offset) const { 271 if (offset != 0) { 272 switch (type()) { 273 case relocInfo::none: 274 break; 275 case relocInfo::oop_type: 276 { 277 oop_Relocation* r = (oop_Relocation*)reloc(); 278 return oop_Relocation::spec(r->oop_index(), r->offset() + offset); 279 } 280 case relocInfo::metadata_type: 281 { 282 metadata_Relocation* r = (metadata_Relocation*)reloc(); 283 return metadata_Relocation::spec(r->metadata_index(), r->offset() + offset); 284 } 285 default: 286 ShouldNotReachHere(); 287 } 288 } 289 return (*this); 290 } 291 292 293 void Relocation::guarantee_size() { 294 guarantee(false, "Make _relocbuf bigger!"); 295 } 296 297 // some relocations can compute their own values 298 address Relocation::value() { 299 ShouldNotReachHere(); 300 return NULL; 301 } 302 303 304 void Relocation::set_value(address x) { 305 ShouldNotReachHere(); 306 } 307 308 void Relocation::const_set_data_value(address x) { 309 #ifdef _LP64 310 if (format() == relocInfo::narrow_oop_in_const) { 311 *(narrowOop*)addr() = CompressedOops::encode((oop) x); 312 } else { 313 #endif 314 *(address*)addr() = x; 315 #ifdef _LP64 316 } 317 #endif 318 } 319 320 void Relocation::const_verify_data_value(address x) { 321 #ifdef _LP64 322 if (format() == relocInfo::narrow_oop_in_const) { 323 guarantee(*(narrowOop*)addr() == CompressedOops::encode((oop) x), "must agree"); 324 } else { 325 #endif 326 guarantee(*(address*)addr() == x, "must agree"); 327 #ifdef _LP64 328 } 329 #endif 330 } 331 332 333 RelocationHolder Relocation::spec_simple(relocInfo::relocType rtype) { 334 if (rtype == relocInfo::none) return RelocationHolder::none; 335 relocInfo ri = relocInfo(rtype, 0); 336 RelocIterator itr; 337 itr.set_current(ri); 338 itr.reloc(); 339 return itr._rh; 340 } 341 342 address Relocation::old_addr_for(address newa, 343 const CodeBuffer* src, CodeBuffer* dest) { 344 int sect = dest->section_index_of(newa); 345 guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address"); 346 address ostart = src->code_section(sect)->start(); 347 address nstart = dest->code_section(sect)->start(); 348 return ostart + (newa - nstart); 349 } 350 351 address Relocation::new_addr_for(address olda, 352 const CodeBuffer* src, CodeBuffer* dest) { 353 debug_only(const CodeBuffer* src0 = src); 354 int sect = CodeBuffer::SECT_NONE; 355 // Look for olda in the source buffer, and all previous incarnations 356 // if the source buffer has been expanded. 357 for (; src != NULL; src = src->before_expand()) { 358 sect = src->section_index_of(olda); 359 if (sect != CodeBuffer::SECT_NONE) break; 360 } 361 guarantee(sect != CodeBuffer::SECT_NONE, "lost track of this address"); 362 address ostart = src->code_section(sect)->start(); 363 address nstart = dest->code_section(sect)->start(); 364 return nstart + (olda - ostart); 365 } 366 367 void Relocation::normalize_address(address& addr, const CodeSection* dest, bool allow_other_sections) { 368 address addr0 = addr; 369 if (addr0 == NULL || dest->allocates2(addr0)) return; 370 CodeBuffer* cb = dest->outer(); 371 addr = new_addr_for(addr0, cb, cb); 372 assert(allow_other_sections || dest->contains2(addr), 373 "addr must be in required section"); 374 } 375 376 377 void CallRelocation::set_destination(address x) { 378 pd_set_call_destination(x); 379 } 380 381 void CallRelocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { 382 // Usually a self-relative reference to an external routine. 383 // On some platforms, the reference is absolute (not self-relative). 384 // The enhanced use of pd_call_destination sorts this all out. 385 address orig_addr = old_addr_for(addr(), src, dest); 386 address callee = pd_call_destination(orig_addr); 387 // Reassert the callee address, this time in the new copy of the code. 388 pd_set_call_destination(callee); 389 } 390 391 392 //// pack/unpack methods 393 394 void oop_Relocation::pack_data_to(CodeSection* dest) { 395 short* p = (short*) dest->locs_end(); 396 p = pack_2_ints_to(p, _oop_index, _offset); 397 dest->set_locs_end((relocInfo*) p); 398 } 399 400 401 void oop_Relocation::unpack_data() { 402 unpack_2_ints(_oop_index, _offset); 403 } 404 405 void metadata_Relocation::pack_data_to(CodeSection* dest) { 406 short* p = (short*) dest->locs_end(); 407 p = pack_2_ints_to(p, _metadata_index, _offset); 408 dest->set_locs_end((relocInfo*) p); 409 } 410 411 412 void metadata_Relocation::unpack_data() { 413 unpack_2_ints(_metadata_index, _offset); 414 } 415 416 417 void virtual_call_Relocation::pack_data_to(CodeSection* dest) { 418 short* p = (short*) dest->locs_end(); 419 address point = dest->locs_point(); 420 421 normalize_address(_cached_value, dest); 422 jint x0 = scaled_offset_null_special(_cached_value, point); 423 p = pack_2_ints_to(p, x0, _method_index); 424 dest->set_locs_end((relocInfo*) p); 425 } 426 427 428 void virtual_call_Relocation::unpack_data() { 429 jint x0 = 0; 430 unpack_2_ints(x0, _method_index); 431 address point = addr(); 432 _cached_value = x0==0? NULL: address_from_scaled_offset(x0, point); 433 } 434 435 void runtime_call_w_cp_Relocation::pack_data_to(CodeSection * dest) { 436 short* p = pack_1_int_to((short *)dest->locs_end(), (jint)(_offset >> 2)); 437 dest->set_locs_end((relocInfo*) p); 438 } 439 440 void runtime_call_w_cp_Relocation::unpack_data() { 441 _offset = unpack_1_int() << 2; 442 } 443 444 void static_stub_Relocation::pack_data_to(CodeSection* dest) { 445 short* p = (short*) dest->locs_end(); 446 CodeSection* insts = dest->outer()->insts(); 447 normalize_address(_static_call, insts); 448 jint is_aot = _is_aot ? 1 : 0; 449 p = pack_2_ints_to(p, scaled_offset(_static_call, insts->start()), is_aot); 450 dest->set_locs_end((relocInfo*) p); 451 } 452 453 void static_stub_Relocation::unpack_data() { 454 address base = binding()->section_start(CodeBuffer::SECT_INSTS); 455 jint offset; 456 jint is_aot; 457 unpack_2_ints(offset, is_aot); 458 _static_call = address_from_scaled_offset(offset, base); 459 _is_aot = (is_aot == 1); 460 } 461 462 void trampoline_stub_Relocation::pack_data_to(CodeSection* dest ) { 463 short* p = (short*) dest->locs_end(); 464 CodeSection* insts = dest->outer()->insts(); 465 normalize_address(_owner, insts); 466 p = pack_1_int_to(p, scaled_offset(_owner, insts->start())); 467 dest->set_locs_end((relocInfo*) p); 468 } 469 470 void trampoline_stub_Relocation::unpack_data() { 471 address base = binding()->section_start(CodeBuffer::SECT_INSTS); 472 _owner = address_from_scaled_offset(unpack_1_int(), base); 473 } 474 475 void external_word_Relocation::pack_data_to(CodeSection* dest) { 476 short* p = (short*) dest->locs_end(); 477 #ifndef _LP64 478 p = pack_1_int_to(p, (int32_t) (intptr_t)_target); 479 #else 480 jlong t = (jlong) _target; 481 int32_t lo = low(t); 482 int32_t hi = high(t); 483 p = pack_2_ints_to(p, lo, hi); 484 #endif /* _LP64 */ 485 dest->set_locs_end((relocInfo*) p); 486 } 487 488 489 void external_word_Relocation::unpack_data() { 490 #ifndef _LP64 491 _target = (address) (intptr_t)unpack_1_int(); 492 #else 493 jint lo, hi; 494 unpack_2_ints(lo, hi); 495 jlong t = jlong_from(hi, lo);; 496 _target = (address) t; 497 #endif /* _LP64 */ 498 } 499 500 501 void internal_word_Relocation::pack_data_to(CodeSection* dest) { 502 short* p = (short*) dest->locs_end(); 503 normalize_address(_target, dest, true); 504 505 // Check whether my target address is valid within this section. 506 // If not, strengthen the relocation type to point to another section. 507 int sindex = _section; 508 if (sindex == CodeBuffer::SECT_NONE && _target != NULL 509 && (!dest->allocates(_target) || _target == dest->locs_point())) { 510 sindex = dest->outer()->section_index_of(_target); 511 guarantee(sindex != CodeBuffer::SECT_NONE, "must belong somewhere"); 512 relocInfo* base = dest->locs_end() - 1; 513 assert(base->type() == this->type(), "sanity"); 514 // Change the written type, to be section_word_type instead. 515 base->set_type(relocInfo::section_word_type); 516 } 517 518 // Note: An internal_word relocation cannot refer to its own instruction, 519 // because we reserve "0" to mean that the pointer itself is embedded 520 // in the code stream. We use a section_word relocation for such cases. 521 522 if (sindex == CodeBuffer::SECT_NONE) { 523 assert(type() == relocInfo::internal_word_type, "must be base class"); 524 guarantee(_target == NULL || dest->allocates2(_target), "must be within the given code section"); 525 jint x0 = scaled_offset_null_special(_target, dest->locs_point()); 526 assert(!(x0 == 0 && _target != NULL), "correct encoding of null target"); 527 p = pack_1_int_to(p, x0); 528 } else { 529 assert(_target != NULL, "sanity"); 530 CodeSection* sect = dest->outer()->code_section(sindex); 531 guarantee(sect->allocates2(_target), "must be in correct section"); 532 address base = sect->start(); 533 jint offset = scaled_offset(_target, base); 534 assert((uint)sindex < (uint)CodeBuffer::SECT_LIMIT, "sanity"); 535 assert(CodeBuffer::SECT_LIMIT <= (1 << section_width), "section_width++"); 536 p = pack_1_int_to(p, (offset << section_width) | sindex); 537 } 538 539 dest->set_locs_end((relocInfo*) p); 540 } 541 542 543 void internal_word_Relocation::unpack_data() { 544 jint x0 = unpack_1_int(); 545 _target = x0==0? NULL: address_from_scaled_offset(x0, addr()); 546 _section = CodeBuffer::SECT_NONE; 547 } 548 549 550 void section_word_Relocation::unpack_data() { 551 jint x = unpack_1_int(); 552 jint offset = (x >> section_width); 553 int sindex = (x & ((1<<section_width)-1)); 554 address base = binding()->section_start(sindex); 555 556 _section = sindex; 557 _target = address_from_scaled_offset(offset, base); 558 } 559 560 //// miscellaneous methods 561 oop* oop_Relocation::oop_addr() { 562 int n = _oop_index; 563 if (n == 0) { 564 // oop is stored in the code stream 565 return (oop*) pd_address_in_code(); 566 } else { 567 // oop is stored in table at nmethod::oops_begin 568 return code()->oop_addr_at(n); 569 } 570 } 571 572 573 oop oop_Relocation::oop_value() { 574 oop v = *oop_addr(); 575 // clean inline caches store a special pseudo-null 576 if (v == (oop)Universe::non_oop_word()) v = NULL; 577 return v; 578 } 579 580 581 void oop_Relocation::fix_oop_relocation() { 582 if (!oop_is_immediate()) { 583 // get the oop from the pool, and re-insert it into the instruction: 584 set_value(value()); 585 } 586 } 587 588 589 void oop_Relocation::verify_oop_relocation() { 590 if (!oop_is_immediate()) { 591 // get the oop from the pool, and re-insert it into the instruction: 592 verify_value(value()); 593 } 594 } 595 596 // meta data versions 597 Metadata** metadata_Relocation::metadata_addr() { 598 int n = _metadata_index; 599 if (n == 0) { 600 // metadata is stored in the code stream 601 return (Metadata**) pd_address_in_code(); 602 } else { 603 // metadata is stored in table at nmethod::metadatas_begin 604 return code()->metadata_addr_at(n); 605 } 606 } 607 608 609 Metadata* metadata_Relocation::metadata_value() { 610 Metadata* v = *metadata_addr(); 611 // clean inline caches store a special pseudo-null 612 if (v == (Metadata*)Universe::non_oop_word()) v = NULL; 613 return v; 614 } 615 616 617 void metadata_Relocation::fix_metadata_relocation() { 618 if (!metadata_is_immediate()) { 619 // get the metadata from the pool, and re-insert it into the instruction: 620 pd_fix_value(value()); 621 } 622 } 623 624 625 void metadata_Relocation::verify_metadata_relocation() { 626 if (!metadata_is_immediate()) { 627 // get the metadata from the pool, and re-insert it into the instruction: 628 verify_value(value()); 629 } 630 } 631 632 address virtual_call_Relocation::cached_value() { 633 assert(_cached_value != NULL && _cached_value < addr(), "must precede ic_call"); 634 return _cached_value; 635 } 636 637 Method* virtual_call_Relocation::method_value() { 638 CompiledMethod* cm = code(); 639 if (cm == NULL) return (Method*)NULL; 640 Metadata* m = cm->metadata_at(_method_index); 641 assert(m != NULL || _method_index == 0, "should be non-null for non-zero index"); 642 assert(m == NULL || m->is_method(), "not a method"); 643 return (Method*)m; 644 } 645 646 void virtual_call_Relocation::clear_inline_cache() { 647 // No stubs for ICs 648 // Clean IC 649 ResourceMark rm; 650 CompiledIC* icache = CompiledIC_at(this); 651 icache->set_to_clean(); 652 } 653 654 655 void opt_virtual_call_Relocation::pack_data_to(CodeSection* dest) { 656 short* p = (short*) dest->locs_end(); 657 p = pack_1_int_to(p, _method_index); 658 dest->set_locs_end((relocInfo*) p); 659 } 660 661 void opt_virtual_call_Relocation::unpack_data() { 662 _method_index = unpack_1_int(); 663 } 664 665 Method* opt_virtual_call_Relocation::method_value() { 666 CompiledMethod* cm = code(); 667 if (cm == NULL) return (Method*)NULL; 668 Metadata* m = cm->metadata_at(_method_index); 669 assert(m != NULL || _method_index == 0, "should be non-null for non-zero index"); 670 assert(m == NULL || m->is_method(), "not a method"); 671 return (Method*)m; 672 } 673 674 void opt_virtual_call_Relocation::clear_inline_cache() { 675 // No stubs for ICs 676 // Clean IC 677 ResourceMark rm; 678 CompiledIC* icache = CompiledIC_at(this); 679 icache->set_to_clean(); 680 } 681 682 683 address opt_virtual_call_Relocation::static_stub(bool is_aot) { 684 // search for the static stub who points back to this static call 685 address static_call_addr = addr(); 686 RelocIterator iter(code()); 687 while (iter.next()) { 688 if (iter.type() == relocInfo::static_stub_type) { 689 static_stub_Relocation* stub_reloc = iter.static_stub_reloc(); 690 if (stub_reloc->static_call() == static_call_addr && stub_reloc->is_aot() == is_aot) { 691 return iter.addr(); 692 } 693 } 694 } 695 return NULL; 696 } 697 698 Method* static_call_Relocation::method_value() { 699 CompiledMethod* cm = code(); 700 if (cm == NULL) return (Method*)NULL; 701 Metadata* m = cm->metadata_at(_method_index); 702 assert(m != NULL || _method_index == 0, "should be non-null for non-zero index"); 703 assert(m == NULL || m->is_method(), "not a method"); 704 return (Method*)m; 705 } 706 707 void static_call_Relocation::pack_data_to(CodeSection* dest) { 708 short* p = (short*) dest->locs_end(); 709 p = pack_1_int_to(p, _method_index); 710 dest->set_locs_end((relocInfo*) p); 711 } 712 713 void static_call_Relocation::unpack_data() { 714 _method_index = unpack_1_int(); 715 } 716 717 void static_call_Relocation::clear_inline_cache() { 718 // Safe call site info 719 CompiledStaticCall* handler = this->code()->compiledStaticCall_at(this); 720 handler->set_to_clean(); 721 } 722 723 724 address static_call_Relocation::static_stub(bool is_aot) { 725 // search for the static stub who points back to this static call 726 address static_call_addr = addr(); 727 RelocIterator iter(code()); 728 while (iter.next()) { 729 if (iter.type() == relocInfo::static_stub_type) { 730 static_stub_Relocation* stub_reloc = iter.static_stub_reloc(); 731 if (stub_reloc->static_call() == static_call_addr && stub_reloc->is_aot() == is_aot) { 732 return iter.addr(); 733 } 734 } 735 } 736 return NULL; 737 } 738 739 // Finds the trampoline address for a call. If no trampoline stub is 740 // found NULL is returned which can be handled by the caller. 741 address trampoline_stub_Relocation::get_trampoline_for(address call, nmethod* code) { 742 // There are no relocations available when the code gets relocated 743 // because of CodeBuffer expansion. 744 if (code->relocation_size() == 0) 745 return NULL; 746 747 RelocIterator iter(code, call); 748 while (iter.next()) { 749 if (iter.type() == relocInfo::trampoline_stub_type) { 750 if (iter.trampoline_stub_reloc()->owner() == call) { 751 return iter.addr(); 752 } 753 } 754 } 755 756 return NULL; 757 } 758 759 void static_stub_Relocation::clear_inline_cache() { 760 // Call stub is only used when calling the interpreted code. 761 // It does not really need to be cleared, except that we want to clean out the methodoop. 762 CompiledDirectStaticCall::set_stub_to_clean(this); 763 } 764 765 766 void external_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { 767 address target = _target; 768 if (target == NULL) { 769 // An absolute embedded reference to an external location, 770 // which means there is nothing to fix here. 771 return; 772 } 773 // Probably this reference is absolute, not relative, so the 774 // following is probably a no-op. 775 assert(src->section_index_of(target) == CodeBuffer::SECT_NONE, "sanity"); 776 set_value(target); 777 } 778 779 780 address external_word_Relocation::target() { 781 address target = _target; 782 if (target == NULL) { 783 target = pd_get_address_from_code(); 784 } 785 return target; 786 } 787 788 789 void internal_word_Relocation::fix_relocation_after_move(const CodeBuffer* src, CodeBuffer* dest) { 790 address target = _target; 791 if (target == NULL) { 792 target = new_addr_for(this->target(), src, dest); 793 } 794 set_value(target); 795 } 796 797 798 address internal_word_Relocation::target() { 799 address target = _target; 800 if (target == NULL) { 801 if (addr_in_const()) { 802 target = *(address*)addr(); 803 } else { 804 target = pd_get_address_from_code(); 805 } 806 } 807 return target; 808 } 809 810 //--------------------------------------------------------------------------------- 811 // Non-product code 812 813 #ifndef PRODUCT 814 815 static const char* reloc_type_string(relocInfo::relocType t) { 816 switch (t) { 817 #define EACH_CASE(name) \ 818 case relocInfo::name##_type: \ 819 return #name; 820 821 APPLY_TO_RELOCATIONS(EACH_CASE); 822 #undef EACH_CASE 823 824 case relocInfo::none: 825 return "none"; 826 case relocInfo::data_prefix_tag: 827 return "prefix"; 828 default: 829 return "UNKNOWN RELOC TYPE"; 830 } 831 } 832 833 834 void RelocIterator::print_current() { 835 if (!has_current()) { 836 tty->print_cr("(no relocs)"); 837 return; 838 } 839 tty->print("relocInfo@" INTPTR_FORMAT " [type=%d(%s) addr=" INTPTR_FORMAT " offset=%d", 840 p2i(_current), type(), reloc_type_string((relocInfo::relocType) type()), p2i(_addr), _current->addr_offset()); 841 if (current()->format() != 0) 842 tty->print(" format=%d", current()->format()); 843 if (datalen() == 1) { 844 tty->print(" data=%d", data()[0]); 845 } else if (datalen() > 0) { 846 tty->print(" data={"); 847 for (int i = 0; i < datalen(); i++) { 848 tty->print("%04x", data()[i] & 0xFFFF); 849 } 850 tty->print("}"); 851 } 852 tty->print("]"); 853 switch (type()) { 854 case relocInfo::oop_type: 855 { 856 oop_Relocation* r = oop_reloc(); 857 oop* oop_addr = NULL; 858 oop raw_oop = NULL; 859 oop oop_value = NULL; 860 if (code() != NULL || r->oop_is_immediate()) { 861 oop_addr = r->oop_addr(); 862 raw_oop = *oop_addr; 863 oop_value = r->oop_value(); 864 } 865 tty->print(" | [oop_addr=" INTPTR_FORMAT " *=" INTPTR_FORMAT " offset=%d]", 866 p2i(oop_addr), p2i(raw_oop), r->offset()); 867 // Do not print the oop by default--we want this routine to 868 // work even during GC or other inconvenient times. 869 if (WizardMode && oop_value != NULL) { 870 tty->print("oop_value=" INTPTR_FORMAT ": ", p2i(oop_value)); 871 if (oopDesc::is_oop(oop_value)) { 872 oop_value->print_value_on(tty); 873 } 874 } 875 break; 876 } 877 case relocInfo::metadata_type: 878 { 879 metadata_Relocation* r = metadata_reloc(); 880 Metadata** metadata_addr = NULL; 881 Metadata* raw_metadata = NULL; 882 Metadata* metadata_value = NULL; 883 if (code() != NULL || r->metadata_is_immediate()) { 884 metadata_addr = r->metadata_addr(); 885 raw_metadata = *metadata_addr; 886 metadata_value = r->metadata_value(); 887 } 888 tty->print(" | [metadata_addr=" INTPTR_FORMAT " *=" INTPTR_FORMAT " offset=%d]", 889 p2i(metadata_addr), p2i(raw_metadata), r->offset()); 890 if (metadata_value != NULL) { 891 tty->print("metadata_value=" INTPTR_FORMAT ": ", p2i(metadata_value)); 892 metadata_value->print_value_on(tty); 893 } 894 break; 895 } 896 case relocInfo::external_word_type: 897 case relocInfo::internal_word_type: 898 case relocInfo::section_word_type: 899 { 900 DataRelocation* r = (DataRelocation*) reloc(); 901 tty->print(" | [target=" INTPTR_FORMAT "]", p2i(r->value())); //value==target 902 break; 903 } 904 case relocInfo::static_call_type: 905 { 906 static_call_Relocation* r = (static_call_Relocation*) reloc(); 907 tty->print(" | [destination=" INTPTR_FORMAT " metadata=" INTPTR_FORMAT "]", 908 p2i(r->destination()), p2i(r->method_value())); 909 break; 910 } 911 case relocInfo::runtime_call_type: 912 case relocInfo::runtime_call_w_cp_type: 913 { 914 CallRelocation* r = (CallRelocation*) reloc(); 915 tty->print(" | [destination=" INTPTR_FORMAT "]", p2i(r->destination())); 916 break; 917 } 918 case relocInfo::virtual_call_type: 919 { 920 virtual_call_Relocation* r = (virtual_call_Relocation*) reloc(); 921 tty->print(" | [destination=" INTPTR_FORMAT " cached_value=" INTPTR_FORMAT " metadata=" INTPTR_FORMAT "]", 922 p2i(r->destination()), p2i(r->cached_value()), p2i(r->method_value())); 923 break; 924 } 925 case relocInfo::static_stub_type: 926 { 927 static_stub_Relocation* r = (static_stub_Relocation*) reloc(); 928 tty->print(" | [static_call=" INTPTR_FORMAT "]", p2i(r->static_call())); 929 break; 930 } 931 case relocInfo::trampoline_stub_type: 932 { 933 trampoline_stub_Relocation* r = (trampoline_stub_Relocation*) reloc(); 934 tty->print(" | [trampoline owner=" INTPTR_FORMAT "]", p2i(r->owner())); 935 break; 936 } 937 case relocInfo::opt_virtual_call_type: 938 { 939 opt_virtual_call_Relocation* r = (opt_virtual_call_Relocation*) reloc(); 940 tty->print(" | [destination=" INTPTR_FORMAT " metadata=" INTPTR_FORMAT "]", 941 p2i(r->destination()), p2i(r->method_value())); 942 break; 943 } 944 default: 945 break; 946 } 947 tty->cr(); 948 } 949 950 951 void RelocIterator::print() { 952 RelocIterator save_this = (*this); 953 relocInfo* scan = _current; 954 if (!has_current()) scan += 1; // nothing to scan here! 955 956 bool skip_next = has_current(); 957 bool got_next; 958 while (true) { 959 got_next = (skip_next || next()); 960 skip_next = false; 961 962 tty->print(" @" INTPTR_FORMAT ": ", p2i(scan)); 963 relocInfo* newscan = _current+1; 964 if (!has_current()) newscan -= 1; // nothing to scan here! 965 while (scan < newscan) { 966 tty->print("%04x", *(short*)scan & 0xFFFF); 967 scan++; 968 } 969 tty->cr(); 970 971 if (!got_next) break; 972 print_current(); 973 } 974 975 (*this) = save_this; 976 } 977 978 // For the debugger: 979 extern "C" 980 void print_blob_locs(nmethod* nm) { 981 nm->print(); 982 RelocIterator iter(nm); 983 iter.print(); 984 } 985 extern "C" 986 void print_buf_locs(CodeBuffer* cb) { 987 FlagSetting fs(PrintRelocations, true); 988 cb->print(); 989 } 990 #endif // !PRODUCT