c1_GraphBuilder.cpp 157.6 KB
Newer Older
D
duke 已提交
1
/*
2
 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
D
duke 已提交
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
19 20 21
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
D
duke 已提交
22 23 24
 *
 */

25 26 27 28 29 30
#include "precompiled.hpp"
#include "c1/c1_CFGPrinter.hpp"
#include "c1/c1_Canonicalizer.hpp"
#include "c1/c1_Compilation.hpp"
#include "c1/c1_GraphBuilder.hpp"
#include "c1/c1_InstructionPrinter.hpp"
31
#include "ci/ciCallSite.hpp"
32 33
#include "ci/ciField.hpp"
#include "ci/ciKlass.hpp"
34
#include "ci/ciMemberName.hpp"
35
#include "compiler/compileBroker.hpp"
36 37
#include "interpreter/bytecode.hpp"
#include "runtime/sharedRuntime.hpp"
38
#include "runtime/compilationPolicy.hpp"
39
#include "utilities/bitMap.inline.hpp"
D
duke 已提交
40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325

class BlockListBuilder VALUE_OBJ_CLASS_SPEC {
 private:
  Compilation* _compilation;
  IRScope*     _scope;

  BlockList    _blocks;                // internal list of all blocks
  BlockList*   _bci2block;             // mapping from bci to blocks for GraphBuilder

  // fields used by mark_loops
  BitMap       _active;                // for iteration of control flow graph
  BitMap       _visited;               // for iteration of control flow graph
  intArray     _loop_map;              // caches the information if a block is contained in a loop
  int          _next_loop_index;       // next free loop number
  int          _next_block_number;     // for reverse postorder numbering of blocks

  // accessors
  Compilation*  compilation() const              { return _compilation; }
  IRScope*      scope() const                    { return _scope; }
  ciMethod*     method() const                   { return scope()->method(); }
  XHandlers*    xhandlers() const                { return scope()->xhandlers(); }

  // unified bailout support
  void          bailout(const char* msg) const   { compilation()->bailout(msg); }
  bool          bailed_out() const               { return compilation()->bailed_out(); }

  // helper functions
  BlockBegin* make_block_at(int bci, BlockBegin* predecessor);
  void handle_exceptions(BlockBegin* current, int cur_bci);
  void handle_jsr(BlockBegin* current, int sr_bci, int next_bci);
  void store_one(BlockBegin* current, int local);
  void store_two(BlockBegin* current, int local);
  void set_entries(int osr_bci);
  void set_leaders();

  void make_loop_header(BlockBegin* block);
  void mark_loops();
  int  mark_loops(BlockBegin* b, bool in_subroutine);

  // debugging
#ifndef PRODUCT
  void print();
#endif

 public:
  // creation
  BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci);

  // accessors for GraphBuilder
  BlockList*    bci2block() const                { return _bci2block; }
};


// Implementation of BlockListBuilder

BlockListBuilder::BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci)
 : _compilation(compilation)
 , _scope(scope)
 , _blocks(16)
 , _bci2block(new BlockList(scope->method()->code_size(), NULL))
 , _next_block_number(0)
 , _active()         // size not known yet
 , _visited()        // size not known yet
 , _next_loop_index(0)
 , _loop_map() // size not known yet
{
  set_entries(osr_bci);
  set_leaders();
  CHECK_BAILOUT();

  mark_loops();
  NOT_PRODUCT(if (PrintInitialBlockList) print());

#ifndef PRODUCT
  if (PrintCFGToFile) {
    stringStream title;
    title.print("BlockListBuilder ");
    scope->method()->print_name(&title);
    CFGPrinter::print_cfg(_bci2block, title.as_string(), false, false);
  }
#endif
}


void BlockListBuilder::set_entries(int osr_bci) {
  // generate start blocks
  BlockBegin* std_entry = make_block_at(0, NULL);
  if (scope()->caller() == NULL) {
    std_entry->set(BlockBegin::std_entry_flag);
  }
  if (osr_bci != -1) {
    BlockBegin* osr_entry = make_block_at(osr_bci, NULL);
    osr_entry->set(BlockBegin::osr_entry_flag);
  }

  // generate exception entry blocks
  XHandlers* list = xhandlers();
  const int n = list->length();
  for (int i = 0; i < n; i++) {
    XHandler* h = list->handler_at(i);
    BlockBegin* entry = make_block_at(h->handler_bci(), NULL);
    entry->set(BlockBegin::exception_entry_flag);
    h->set_entry_block(entry);
  }
}


BlockBegin* BlockListBuilder::make_block_at(int cur_bci, BlockBegin* predecessor) {
  assert(method()->bci_block_start().at(cur_bci), "wrong block starts of MethodLivenessAnalyzer");

  BlockBegin* block = _bci2block->at(cur_bci);
  if (block == NULL) {
    block = new BlockBegin(cur_bci);
    block->init_stores_to_locals(method()->max_locals());
    _bci2block->at_put(cur_bci, block);
    _blocks.append(block);

    assert(predecessor == NULL || predecessor->bci() < cur_bci, "targets for backward branches must already exist");
  }

  if (predecessor != NULL) {
    if (block->is_set(BlockBegin::exception_entry_flag)) {
      BAILOUT_("Exception handler can be reached by both normal and exceptional control flow", block);
    }

    predecessor->add_successor(block);
    block->increment_total_preds();
  }

  return block;
}


inline void BlockListBuilder::store_one(BlockBegin* current, int local) {
  current->stores_to_locals().set_bit(local);
}
inline void BlockListBuilder::store_two(BlockBegin* current, int local) {
  store_one(current, local);
  store_one(current, local + 1);
}


void BlockListBuilder::handle_exceptions(BlockBegin* current, int cur_bci) {
  // Draws edges from a block to its exception handlers
  XHandlers* list = xhandlers();
  const int n = list->length();

  for (int i = 0; i < n; i++) {
    XHandler* h = list->handler_at(i);

    if (h->covers(cur_bci)) {
      BlockBegin* entry = h->entry_block();
      assert(entry != NULL && entry == _bci2block->at(h->handler_bci()), "entry must be set");
      assert(entry->is_set(BlockBegin::exception_entry_flag), "flag must be set");

      // add each exception handler only once
      if (!current->is_successor(entry)) {
        current->add_successor(entry);
        entry->increment_total_preds();
      }

      // stop when reaching catchall
      if (h->catch_type() == 0) break;
    }
  }
}

void BlockListBuilder::handle_jsr(BlockBegin* current, int sr_bci, int next_bci) {
  // start a new block after jsr-bytecode and link this block into cfg
  make_block_at(next_bci, current);

  // start a new block at the subroutine entry at mark it with special flag
  BlockBegin* sr_block = make_block_at(sr_bci, current);
  if (!sr_block->is_set(BlockBegin::subroutine_entry_flag)) {
    sr_block->set(BlockBegin::subroutine_entry_flag);
  }
}


void BlockListBuilder::set_leaders() {
  bool has_xhandlers = xhandlers()->has_handlers();
  BlockBegin* current = NULL;

  // The information which bci starts a new block simplifies the analysis
  // Without it, backward branches could jump to a bci where no block was created
  // during bytecode iteration. This would require the creation of a new block at the
  // branch target and a modification of the successor lists.
  BitMap bci_block_start = method()->bci_block_start();

  ciBytecodeStream s(method());
  while (s.next() != ciBytecodeStream::EOBC()) {
    int cur_bci = s.cur_bci();

    if (bci_block_start.at(cur_bci)) {
      current = make_block_at(cur_bci, current);
    }
    assert(current != NULL, "must have current block");

    if (has_xhandlers && GraphBuilder::can_trap(method(), s.cur_bc())) {
      handle_exceptions(current, cur_bci);
    }

    switch (s.cur_bc()) {
      // track stores to local variables for selective creation of phi functions
      case Bytecodes::_iinc:     store_one(current, s.get_index()); break;
      case Bytecodes::_istore:   store_one(current, s.get_index()); break;
      case Bytecodes::_lstore:   store_two(current, s.get_index()); break;
      case Bytecodes::_fstore:   store_one(current, s.get_index()); break;
      case Bytecodes::_dstore:   store_two(current, s.get_index()); break;
      case Bytecodes::_astore:   store_one(current, s.get_index()); break;
      case Bytecodes::_istore_0: store_one(current, 0); break;
      case Bytecodes::_istore_1: store_one(current, 1); break;
      case Bytecodes::_istore_2: store_one(current, 2); break;
      case Bytecodes::_istore_3: store_one(current, 3); break;
      case Bytecodes::_lstore_0: store_two(current, 0); break;
      case Bytecodes::_lstore_1: store_two(current, 1); break;
      case Bytecodes::_lstore_2: store_two(current, 2); break;
      case Bytecodes::_lstore_3: store_two(current, 3); break;
      case Bytecodes::_fstore_0: store_one(current, 0); break;
      case Bytecodes::_fstore_1: store_one(current, 1); break;
      case Bytecodes::_fstore_2: store_one(current, 2); break;
      case Bytecodes::_fstore_3: store_one(current, 3); break;
      case Bytecodes::_dstore_0: store_two(current, 0); break;
      case Bytecodes::_dstore_1: store_two(current, 1); break;
      case Bytecodes::_dstore_2: store_two(current, 2); break;
      case Bytecodes::_dstore_3: store_two(current, 3); break;
      case Bytecodes::_astore_0: store_one(current, 0); break;
      case Bytecodes::_astore_1: store_one(current, 1); break;
      case Bytecodes::_astore_2: store_one(current, 2); break;
      case Bytecodes::_astore_3: store_one(current, 3); break;

      // track bytecodes that affect the control flow
      case Bytecodes::_athrow:  // fall through
      case Bytecodes::_ret:     // fall through
      case Bytecodes::_ireturn: // fall through
      case Bytecodes::_lreturn: // fall through
      case Bytecodes::_freturn: // fall through
      case Bytecodes::_dreturn: // fall through
      case Bytecodes::_areturn: // fall through
      case Bytecodes::_return:
        current = NULL;
        break;

      case Bytecodes::_ifeq:      // fall through
      case Bytecodes::_ifne:      // fall through
      case Bytecodes::_iflt:      // fall through
      case Bytecodes::_ifge:      // fall through
      case Bytecodes::_ifgt:      // fall through
      case Bytecodes::_ifle:      // fall through
      case Bytecodes::_if_icmpeq: // fall through
      case Bytecodes::_if_icmpne: // fall through
      case Bytecodes::_if_icmplt: // fall through
      case Bytecodes::_if_icmpge: // fall through
      case Bytecodes::_if_icmpgt: // fall through
      case Bytecodes::_if_icmple: // fall through
      case Bytecodes::_if_acmpeq: // fall through
      case Bytecodes::_if_acmpne: // fall through
      case Bytecodes::_ifnull:    // fall through
      case Bytecodes::_ifnonnull:
        make_block_at(s.next_bci(), current);
        make_block_at(s.get_dest(), current);
        current = NULL;
        break;

      case Bytecodes::_goto:
        make_block_at(s.get_dest(), current);
        current = NULL;
        break;

      case Bytecodes::_goto_w:
        make_block_at(s.get_far_dest(), current);
        current = NULL;
        break;

      case Bytecodes::_jsr:
        handle_jsr(current, s.get_dest(), s.next_bci());
        current = NULL;
        break;

      case Bytecodes::_jsr_w:
        handle_jsr(current, s.get_far_dest(), s.next_bci());
        current = NULL;
        break;

      case Bytecodes::_tableswitch: {
        // set block for each case
326 327
        Bytecode_tableswitch sw(&s);
        int l = sw.length();
D
duke 已提交
328
        for (int i = 0; i < l; i++) {
329
          make_block_at(cur_bci + sw.dest_offset_at(i), current);
D
duke 已提交
330
        }
331
        make_block_at(cur_bci + sw.default_offset(), current);
D
duke 已提交
332 333 334 335 336 337
        current = NULL;
        break;
      }

      case Bytecodes::_lookupswitch: {
        // set block for each case
338 339
        Bytecode_lookupswitch sw(&s);
        int l = sw.number_of_pairs();
D
duke 已提交
340
        for (int i = 0; i < l; i++) {
341
          make_block_at(cur_bci + sw.pair_at(i).offset(), current);
D
duke 已提交
342
        }
343
        make_block_at(cur_bci + sw.default_offset(), current);
D
duke 已提交
344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380
        current = NULL;
        break;
      }
    }
  }
}


void BlockListBuilder::mark_loops() {
  ResourceMark rm;

  _active = BitMap(BlockBegin::number_of_blocks());         _active.clear();
  _visited = BitMap(BlockBegin::number_of_blocks());        _visited.clear();
  _loop_map = intArray(BlockBegin::number_of_blocks(), 0);
  _next_loop_index = 0;
  _next_block_number = _blocks.length();

  // recursively iterate the control flow graph
  mark_loops(_bci2block->at(0), false);
  assert(_next_block_number >= 0, "invalid block numbers");
}

void BlockListBuilder::make_loop_header(BlockBegin* block) {
  if (block->is_set(BlockBegin::exception_entry_flag)) {
    // exception edges may look like loops but don't mark them as such
    // since it screws up block ordering.
    return;
  }
  if (!block->is_set(BlockBegin::parser_loop_header_flag)) {
    block->set(BlockBegin::parser_loop_header_flag);

    assert(_loop_map.at(block->block_id()) == 0, "must not be set yet");
    assert(0 <= _next_loop_index && _next_loop_index < BitsPerInt, "_next_loop_index is used as a bit-index in integer");
    _loop_map.at_put(block->block_id(), 1 << _next_loop_index);
    if (_next_loop_index < 31) _next_loop_index++;
  } else {
    // block already marked as loop header
R
roland 已提交
381
    assert(is_power_of_2((unsigned int)_loop_map.at(block->block_id())), "exactly one bit must be set");
D
duke 已提交
382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835
  }
}

int BlockListBuilder::mark_loops(BlockBegin* block, bool in_subroutine) {
  int block_id = block->block_id();

  if (_visited.at(block_id)) {
    if (_active.at(block_id)) {
      // reached block via backward branch
      make_loop_header(block);
    }
    // return cached loop information for this block
    return _loop_map.at(block_id);
  }

  if (block->is_set(BlockBegin::subroutine_entry_flag)) {
    in_subroutine = true;
  }

  // set active and visited bits before successors are processed
  _visited.set_bit(block_id);
  _active.set_bit(block_id);

  intptr_t loop_state = 0;
  for (int i = block->number_of_sux() - 1; i >= 0; i--) {
    // recursively process all successors
    loop_state |= mark_loops(block->sux_at(i), in_subroutine);
  }

  // clear active-bit after all successors are processed
  _active.clear_bit(block_id);

  // reverse-post-order numbering of all blocks
  block->set_depth_first_number(_next_block_number);
  _next_block_number--;

  if (loop_state != 0 || in_subroutine ) {
    // block is contained at least in one loop, so phi functions are necessary
    // phi functions are also necessary for all locals stored in a subroutine
    scope()->requires_phi_function().set_union(block->stores_to_locals());
  }

  if (block->is_set(BlockBegin::parser_loop_header_flag)) {
    int header_loop_state = _loop_map.at(block_id);
    assert(is_power_of_2((unsigned)header_loop_state), "exactly one bit must be set");

    // If the highest bit is set (i.e. when integer value is negative), the method
    // has 32 or more loops. This bit is never cleared because it is used for multiple loops
    if (header_loop_state >= 0) {
      clear_bits(loop_state, header_loop_state);
    }
  }

  // cache and return loop information for this block
  _loop_map.at_put(block_id, loop_state);
  return loop_state;
}


#ifndef PRODUCT

int compare_depth_first(BlockBegin** a, BlockBegin** b) {
  return (*a)->depth_first_number() - (*b)->depth_first_number();
}

void BlockListBuilder::print() {
  tty->print("----- initial block list of BlockListBuilder for method ");
  method()->print_short_name();
  tty->cr();

  // better readability if blocks are sorted in processing order
  _blocks.sort(compare_depth_first);

  for (int i = 0; i < _blocks.length(); i++) {
    BlockBegin* cur = _blocks.at(i);
    tty->print("%4d: B%-4d bci: %-4d  preds: %-4d ", cur->depth_first_number(), cur->block_id(), cur->bci(), cur->total_preds());

    tty->print(cur->is_set(BlockBegin::std_entry_flag)               ? " std" : "    ");
    tty->print(cur->is_set(BlockBegin::osr_entry_flag)               ? " osr" : "    ");
    tty->print(cur->is_set(BlockBegin::exception_entry_flag)         ? " ex" : "   ");
    tty->print(cur->is_set(BlockBegin::subroutine_entry_flag)        ? " sr" : "   ");
    tty->print(cur->is_set(BlockBegin::parser_loop_header_flag)      ? " lh" : "   ");

    if (cur->number_of_sux() > 0) {
      tty->print("    sux: ");
      for (int j = 0; j < cur->number_of_sux(); j++) {
        BlockBegin* sux = cur->sux_at(j);
        tty->print("B%d ", sux->block_id());
      }
    }
    tty->cr();
  }
}

#endif


// A simple growable array of Values indexed by ciFields
class FieldBuffer: public CompilationResourceObj {
 private:
  GrowableArray<Value> _values;

 public:
  FieldBuffer() {}

  void kill() {
    _values.trunc_to(0);
  }

  Value at(ciField* field) {
    assert(field->holder()->is_loaded(), "must be a loaded field");
    int offset = field->offset();
    if (offset < _values.length()) {
      return _values.at(offset);
    } else {
      return NULL;
    }
  }

  void at_put(ciField* field, Value value) {
    assert(field->holder()->is_loaded(), "must be a loaded field");
    int offset = field->offset();
    _values.at_put_grow(offset, value, NULL);
  }

};


// MemoryBuffer is fairly simple model of the current state of memory.
// It partitions memory into several pieces.  The first piece is
// generic memory where little is known about the owner of the memory.
// This is conceptually represented by the tuple <O, F, V> which says
// that the field F of object O has value V.  This is flattened so
// that F is represented by the offset of the field and the parallel
// arrays _objects and _values are used for O and V.  Loads of O.F can
// simply use V.  Newly allocated objects are kept in a separate list
// along with a parallel array for each object which represents the
// current value of its fields.  Stores of the default value to fields
// which have never been stored to before are eliminated since they
// are redundant.  Once newly allocated objects are stored into
// another object or they are passed out of the current compile they
// are treated like generic memory.

class MemoryBuffer: public CompilationResourceObj {
 private:
  FieldBuffer                 _values;
  GrowableArray<Value>        _objects;
  GrowableArray<Value>        _newobjects;
  GrowableArray<FieldBuffer*> _fields;

 public:
  MemoryBuffer() {}

  StoreField* store(StoreField* st) {
    if (!EliminateFieldAccess) {
      return st;
    }

    Value object = st->obj();
    Value value = st->value();
    ciField* field = st->field();
    if (field->holder()->is_loaded()) {
      int offset = field->offset();
      int index = _newobjects.find(object);
      if (index != -1) {
        // newly allocated object with no other stores performed on this field
        FieldBuffer* buf = _fields.at(index);
        if (buf->at(field) == NULL && is_default_value(value)) {
#ifndef PRODUCT
          if (PrintIRDuringConstruction && Verbose) {
            tty->print_cr("Eliminated store for object %d:", index);
            st->print_line();
          }
#endif
          return NULL;
        } else {
          buf->at_put(field, value);
        }
      } else {
        _objects.at_put_grow(offset, object, NULL);
        _values.at_put(field, value);
      }

      store_value(value);
    } else {
      // if we held onto field names we could alias based on names but
      // we don't know what's being stored to so kill it all.
      kill();
    }
    return st;
  }


  // return true if this value correspond to the default value of a field.
  bool is_default_value(Value value) {
    Constant* con = value->as_Constant();
    if (con) {
      switch (con->type()->tag()) {
        case intTag:    return con->type()->as_IntConstant()->value() == 0;
        case longTag:   return con->type()->as_LongConstant()->value() == 0;
        case floatTag:  return jint_cast(con->type()->as_FloatConstant()->value()) == 0;
        case doubleTag: return jlong_cast(con->type()->as_DoubleConstant()->value()) == jlong_cast(0);
        case objectTag: return con->type() == objectNull;
        default:  ShouldNotReachHere();
      }
    }
    return false;
  }


  // return either the actual value of a load or the load itself
  Value load(LoadField* load) {
    if (!EliminateFieldAccess) {
      return load;
    }

    if (RoundFPResults && UseSSE < 2 && load->type()->is_float_kind()) {
      // can't skip load since value might get rounded as a side effect
      return load;
    }

    ciField* field = load->field();
    Value object   = load->obj();
    if (field->holder()->is_loaded() && !field->is_volatile()) {
      int offset = field->offset();
      Value result = NULL;
      int index = _newobjects.find(object);
      if (index != -1) {
        result = _fields.at(index)->at(field);
      } else if (_objects.at_grow(offset, NULL) == object) {
        result = _values.at(field);
      }
      if (result != NULL) {
#ifndef PRODUCT
        if (PrintIRDuringConstruction && Verbose) {
          tty->print_cr("Eliminated load: ");
          load->print_line();
        }
#endif
        assert(result->type()->tag() == load->type()->tag(), "wrong types");
        return result;
      }
    }
    return load;
  }

  // Record this newly allocated object
  void new_instance(NewInstance* object) {
    int index = _newobjects.length();
    _newobjects.append(object);
    if (_fields.at_grow(index, NULL) == NULL) {
      _fields.at_put(index, new FieldBuffer());
    } else {
      _fields.at(index)->kill();
    }
  }

  void store_value(Value value) {
    int index = _newobjects.find(value);
    if (index != -1) {
      // stored a newly allocated object into another object.
      // Assume we've lost track of it as separate slice of memory.
      // We could do better by keeping track of whether individual
      // fields could alias each other.
      _newobjects.remove_at(index);
      // pull out the field info and store it at the end up the list
      // of field info list to be reused later.
      _fields.append(_fields.at(index));
      _fields.remove_at(index);
    }
  }

  void kill() {
    _newobjects.trunc_to(0);
    _objects.trunc_to(0);
    _values.kill();
  }
};


// Implementation of GraphBuilder's ScopeData

GraphBuilder::ScopeData::ScopeData(ScopeData* parent)
  : _parent(parent)
  , _bci2block(NULL)
  , _scope(NULL)
  , _has_handler(false)
  , _stream(NULL)
  , _work_list(NULL)
  , _parsing_jsr(false)
  , _jsr_xhandlers(NULL)
  , _caller_stack_size(-1)
  , _continuation(NULL)
  , _num_returns(0)
  , _cleanup_block(NULL)
  , _cleanup_return_prev(NULL)
  , _cleanup_state(NULL)
{
  if (parent != NULL) {
    _max_inline_size = (intx) ((float) NestedInliningSizeRatio * (float) parent->max_inline_size() / 100.0f);
  } else {
    _max_inline_size = MaxInlineSize;
  }
  if (_max_inline_size < MaxTrivialSize) {
    _max_inline_size = MaxTrivialSize;
  }
}


void GraphBuilder::kill_all() {
  if (UseLocalValueNumbering) {
    vmap()->kill_all();
  }
  _memory->kill();
}


BlockBegin* GraphBuilder::ScopeData::block_at(int bci) {
  if (parsing_jsr()) {
    // It is necessary to clone all blocks associated with a
    // subroutine, including those for exception handlers in the scope
    // of the method containing the jsr (because those exception
    // handlers may contain ret instructions in some cases).
    BlockBegin* block = bci2block()->at(bci);
    if (block != NULL && block == parent()->bci2block()->at(bci)) {
      BlockBegin* new_block = new BlockBegin(block->bci());
#ifndef PRODUCT
      if (PrintInitialBlockList) {
        tty->print_cr("CFG: cloned block %d (bci %d) as block %d for jsr",
                      block->block_id(), block->bci(), new_block->block_id());
      }
#endif
      // copy data from cloned blocked
      new_block->set_depth_first_number(block->depth_first_number());
      if (block->is_set(BlockBegin::parser_loop_header_flag)) new_block->set(BlockBegin::parser_loop_header_flag);
      // Preserve certain flags for assertion checking
      if (block->is_set(BlockBegin::subroutine_entry_flag)) new_block->set(BlockBegin::subroutine_entry_flag);
      if (block->is_set(BlockBegin::exception_entry_flag))  new_block->set(BlockBegin::exception_entry_flag);

      // copy was_visited_flag to allow early detection of bailouts
      // if a block that is used in a jsr has already been visited before,
      // it is shared between the normal control flow and a subroutine
      // BlockBegin::try_merge returns false when the flag is set, this leads
      // to a compilation bailout
      if (block->is_set(BlockBegin::was_visited_flag))  new_block->set(BlockBegin::was_visited_flag);

      bci2block()->at_put(bci, new_block);
      block = new_block;
    }
    return block;
  } else {
    return bci2block()->at(bci);
  }
}


XHandlers* GraphBuilder::ScopeData::xhandlers() const {
  if (_jsr_xhandlers == NULL) {
    assert(!parsing_jsr(), "");
    return scope()->xhandlers();
  }
  assert(parsing_jsr(), "");
  return _jsr_xhandlers;
}


void GraphBuilder::ScopeData::set_scope(IRScope* scope) {
  _scope = scope;
  bool parent_has_handler = false;
  if (parent() != NULL) {
    parent_has_handler = parent()->has_handler();
  }
  _has_handler = parent_has_handler || scope->xhandlers()->has_handlers();
}


void GraphBuilder::ScopeData::set_inline_cleanup_info(BlockBegin* block,
                                                      Instruction* return_prev,
                                                      ValueStack* return_state) {
  _cleanup_block       = block;
  _cleanup_return_prev = return_prev;
  _cleanup_state       = return_state;
}


void GraphBuilder::ScopeData::add_to_work_list(BlockBegin* block) {
  if (_work_list == NULL) {
    _work_list = new BlockList();
  }

  if (!block->is_set(BlockBegin::is_on_work_list_flag)) {
    // Do not start parsing the continuation block while in a
    // sub-scope
    if (parsing_jsr()) {
      if (block == jsr_continuation()) {
        return;
      }
    } else {
      if (block == continuation()) {
        return;
      }
    }
    block->set(BlockBegin::is_on_work_list_flag);
    _work_list->push(block);

    sort_top_into_worklist(_work_list, block);
  }
}


void GraphBuilder::sort_top_into_worklist(BlockList* worklist, BlockBegin* top) {
  assert(worklist->top() == top, "");
  // sort block descending into work list
  const int dfn = top->depth_first_number();
  assert(dfn != -1, "unknown depth first number");
  int i = worklist->length()-2;
  while (i >= 0) {
    BlockBegin* b = worklist->at(i);
    if (b->depth_first_number() < dfn) {
      worklist->at_put(i+1, b);
    } else {
      break;
    }
    i --;
  }
  if (i >= -1) worklist->at_put(i + 1, top);
}


BlockBegin* GraphBuilder::ScopeData::remove_from_work_list() {
  if (is_work_list_empty()) {
    return NULL;
  }
  return _work_list->pop();
}


bool GraphBuilder::ScopeData::is_work_list_empty() const {
  return (_work_list == NULL || _work_list->length() == 0);
}


void GraphBuilder::ScopeData::setup_jsr_xhandlers() {
  assert(parsing_jsr(), "");
  // clone all the exception handlers from the scope
  XHandlers* handlers = new XHandlers(scope()->xhandlers());
  const int n = handlers->length();
  for (int i = 0; i < n; i++) {
    // The XHandlers need to be adjusted to dispatch to the cloned
    // handler block instead of the default one but the synthetic
    // unlocker needs to be handled specially.  The synthetic unlocker
    // should be left alone since there can be only one and all code
    // should dispatch to the same one.
    XHandler* h = handlers->handler_at(i);
836 837
    assert(h->handler_bci() != SynchronizationEntryBCI, "must be real");
    h->set_entry_block(block_at(h->handler_bci()));
D
duke 已提交
838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884
  }
  _jsr_xhandlers = handlers;
}


int GraphBuilder::ScopeData::num_returns() {
  if (parsing_jsr()) {
    return parent()->num_returns();
  }
  return _num_returns;
}


void GraphBuilder::ScopeData::incr_num_returns() {
  if (parsing_jsr()) {
    parent()->incr_num_returns();
  } else {
    ++_num_returns;
  }
}


// Implementation of GraphBuilder

#define INLINE_BAILOUT(msg)        { inline_bailout(msg); return false; }


void GraphBuilder::load_constant() {
  ciConstant con = stream()->get_constant();
  if (con.basic_type() == T_ILLEGAL) {
    BAILOUT("could not resolve a constant");
  } else {
    ValueType* t = illegalType;
    ValueStack* patch_state = NULL;
    switch (con.basic_type()) {
      case T_BOOLEAN: t = new IntConstant     (con.as_boolean()); break;
      case T_BYTE   : t = new IntConstant     (con.as_byte   ()); break;
      case T_CHAR   : t = new IntConstant     (con.as_char   ()); break;
      case T_SHORT  : t = new IntConstant     (con.as_short  ()); break;
      case T_INT    : t = new IntConstant     (con.as_int    ()); break;
      case T_LONG   : t = new LongConstant    (con.as_long   ()); break;
      case T_FLOAT  : t = new FloatConstant   (con.as_float  ()); break;
      case T_DOUBLE : t = new DoubleConstant  (con.as_double ()); break;
      case T_ARRAY  : t = new ArrayConstant   (con.as_object ()->as_array   ()); break;
      case T_OBJECT :
       {
        ciObject* obj = con.as_object();
885 886
        if (!obj->is_loaded()
            || (PatchALot && obj->klass() != ciEnv::current()->String_klass())) {
R
roland 已提交
887
          patch_state = copy_state_before();
888
          t = new ObjectConstant(obj);
D
duke 已提交
889
        } else {
890
          assert(obj->is_instance(), "must be java_mirror of klass");
D
duke 已提交
891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908
          t = new InstanceConstant(obj->as_instance());
        }
        break;
       }
      default       : ShouldNotReachHere();
    }
    Value x;
    if (patch_state != NULL) {
      x = new Constant(t, patch_state);
    } else {
      x = new Constant(t);
    }
    push(t, append(x));
  }
}


void GraphBuilder::load_local(ValueType* type, int index) {
R
roland 已提交
909 910
  Value x = state()->local_at(index);
  assert(x != NULL && !x->type()->is_illegal(), "access of illegal local variable");
D
duke 已提交
911 912 913 914 915 916
  push(type, x);
}


void GraphBuilder::store_local(ValueType* type, int index) {
  Value x = pop(type);
917
  store_local(state(), x, index);
D
duke 已提交
918 919 920
}


921
void GraphBuilder::store_local(ValueStack* state, Value x, int index) {
D
duke 已提交
922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949
  if (parsing_jsr()) {
    // We need to do additional tracking of the location of the return
    // address for jsrs since we don't handle arbitrary jsr/ret
    // constructs. Here we are figuring out in which circumstances we
    // need to bail out.
    if (x->type()->is_address()) {
      scope_data()->set_jsr_return_address_local(index);

      // Also check parent jsrs (if any) at this time to see whether
      // they are using this local. We don't handle skipping over a
      // ret.
      for (ScopeData* cur_scope_data = scope_data()->parent();
           cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
           cur_scope_data = cur_scope_data->parent()) {
        if (cur_scope_data->jsr_return_address_local() == index) {
          BAILOUT("subroutine overwrites return address from previous subroutine");
        }
      }
    } else if (index == scope_data()->jsr_return_address_local()) {
      scope_data()->set_jsr_return_address_local(-1);
    }
  }

  state->store_local(index, round_fp(x));
}


void GraphBuilder::load_indexed(BasicType type) {
950 951 952
  // In case of in block code motion in range check elimination
  ValueStack* state_before = copy_state_indexed_access();
  compilation()->set_has_access_indexed(true);
D
duke 已提交
953 954 955 956 957 958
  Value index = ipop();
  Value array = apop();
  Value length = NULL;
  if (CSEArrayLength ||
      (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
      (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) {
R
roland 已提交
959
    length = append(new ArrayLength(array, state_before));
D
duke 已提交
960
  }
R
roland 已提交
961
  push(as_ValueType(type), append(new LoadIndexed(array, index, length, type, state_before)));
D
duke 已提交
962 963 964 965
}


void GraphBuilder::store_indexed(BasicType type) {
966 967 968
  // In case of in block code motion in range check elimination
  ValueStack* state_before = copy_state_indexed_access();
  compilation()->set_has_access_indexed(true);
D
duke 已提交
969 970 971 972 973 974 975
  Value value = pop(as_ValueType(type));
  Value index = ipop();
  Value array = apop();
  Value length = NULL;
  if (CSEArrayLength ||
      (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
      (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) {
R
roland 已提交
976
    length = append(new ArrayLength(array, state_before));
D
duke 已提交
977
  }
R
roland 已提交
978
  StoreIndexed* result = new StoreIndexed(array, index, length, type, value, state_before);
D
duke 已提交
979
  append(result);
N
never 已提交
980
  _memory->store_value(value);
981 982 983 984 985 986 987 988 989 990 991

  if (type == T_OBJECT && is_profiling()) {
    // Note that we'd collect profile data in this method if we wanted it.
    compilation()->set_would_profile(true);

    if (profile_checkcasts()) {
      result->set_profiled_method(method());
      result->set_profiled_bci(bci());
      result->set_should_profile(true);
    }
  }
D
duke 已提交
992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076
}


void GraphBuilder::stack_op(Bytecodes::Code code) {
  switch (code) {
    case Bytecodes::_pop:
      { state()->raw_pop();
      }
      break;
    case Bytecodes::_pop2:
      { state()->raw_pop();
        state()->raw_pop();
      }
      break;
    case Bytecodes::_dup:
      { Value w = state()->raw_pop();
        state()->raw_push(w);
        state()->raw_push(w);
      }
      break;
    case Bytecodes::_dup_x1:
      { Value w1 = state()->raw_pop();
        Value w2 = state()->raw_pop();
        state()->raw_push(w1);
        state()->raw_push(w2);
        state()->raw_push(w1);
      }
      break;
    case Bytecodes::_dup_x2:
      { Value w1 = state()->raw_pop();
        Value w2 = state()->raw_pop();
        Value w3 = state()->raw_pop();
        state()->raw_push(w1);
        state()->raw_push(w3);
        state()->raw_push(w2);
        state()->raw_push(w1);
      }
      break;
    case Bytecodes::_dup2:
      { Value w1 = state()->raw_pop();
        Value w2 = state()->raw_pop();
        state()->raw_push(w2);
        state()->raw_push(w1);
        state()->raw_push(w2);
        state()->raw_push(w1);
      }
      break;
    case Bytecodes::_dup2_x1:
      { Value w1 = state()->raw_pop();
        Value w2 = state()->raw_pop();
        Value w3 = state()->raw_pop();
        state()->raw_push(w2);
        state()->raw_push(w1);
        state()->raw_push(w3);
        state()->raw_push(w2);
        state()->raw_push(w1);
      }
      break;
    case Bytecodes::_dup2_x2:
      { Value w1 = state()->raw_pop();
        Value w2 = state()->raw_pop();
        Value w3 = state()->raw_pop();
        Value w4 = state()->raw_pop();
        state()->raw_push(w2);
        state()->raw_push(w1);
        state()->raw_push(w4);
        state()->raw_push(w3);
        state()->raw_push(w2);
        state()->raw_push(w1);
      }
      break;
    case Bytecodes::_swap:
      { Value w1 = state()->raw_pop();
        Value w2 = state()->raw_pop();
        state()->raw_push(w1);
        state()->raw_push(w2);
      }
      break;
    default:
      ShouldNotReachHere();
      break;
  }
}


R
roland 已提交
1077
void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) {
D
duke 已提交
1078 1079 1080 1081
  Value y = pop(type);
  Value x = pop(type);
  // NOTE: strictfp can be queried from current method since we don't
  // inline methods with differing strictfp bits
R
roland 已提交
1082
  Value res = new ArithmeticOp(code, x, y, method()->is_strict(), state_before);
D
duke 已提交
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
  // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level
  res = append(res);
  if (method()->is_strict()) {
    res = round_fp(res);
  }
  push(type, res);
}


void GraphBuilder::negate_op(ValueType* type) {
  push(type, append(new NegateOp(pop(type))));
}


void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) {
  Value s = ipop();
  Value x = pop(type);
  // try to simplify
  // Note: This code should go into the canonicalizer as soon as it can
  //       can handle canonicalized forms that contain more than one node.
  if (CanonicalizeNodes && code == Bytecodes::_iushr) {
    // pattern: x >>> s
    IntConstant* s1 = s->type()->as_IntConstant();
    if (s1 != NULL) {
      // pattern: x >>> s1, with s1 constant
      ShiftOp* l = x->as_ShiftOp();
      if (l != NULL && l->op() == Bytecodes::_ishl) {
        // pattern: (a << b) >>> s1
        IntConstant* s0 = l->y()->type()->as_IntConstant();
        if (s0 != NULL) {
          // pattern: (a << s0) >>> s1
          const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts
          const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts
          if (s0c == s1c) {
            if (s0c == 0) {
              // pattern: (a << 0) >>> 0 => simplify to: a
              ipush(l->x());
            } else {
              // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant
              assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases");
              const int m = (1 << (BitsPerInt - s0c)) - 1;
              Value s = append(new Constant(new IntConstant(m)));
              ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s)));
            }
            return;
          }
        }
      }
    }
  }
  // could not simplify
  push(type, append(new ShiftOp(code, x, s)));
}


void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) {
  Value y = pop(type);
  Value x = pop(type);
  push(type, append(new LogicOp(code, x, y)));
}


void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) {
R
roland 已提交
1146
  ValueStack* state_before = copy_state_before();
D
duke 已提交
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
  Value y = pop(type);
  Value x = pop(type);
  ipush(append(new CompareOp(code, x, y, state_before)));
}


void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) {
  push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to))));
}


void GraphBuilder::increment() {
  int index = stream()->get_index();
  int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]);
  load_local(intType, index);
  ipush(append(new Constant(new IntConstant(delta))));
  arithmetic_op(intType, Bytecodes::_iadd);
  store_local(intType, index);
}


void GraphBuilder::_goto(int from_bci, int to_bci) {
I
iveresov 已提交
1169 1170 1171 1172
  Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci);
  if (is_profiling()) {
    compilation()->set_would_profile(true);
    x->set_profiled_bci(bci());
1173 1174 1175 1176
    if (profile_branches()) {
      x->set_profiled_method(method());
      x->set_should_profile(true);
    }
I
iveresov 已提交
1177 1178
  }
  append(x);
D
duke 已提交
1179 1180 1181 1182 1183 1184 1185
}


void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) {
  BlockBegin* tsux = block_at(stream()->get_dest());
  BlockBegin* fsux = block_at(stream()->next_bci());
  bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci();
1186 1187 1188
  // In case of loop invariant code motion or predicate insertion
  // before the body of a loop the state is needed
  Instruction *i = append(new If(x, cond, false, y, tsux, fsux, (is_bb || compilation()->is_optimistic()) ? state_before : NULL, is_bb));
I
iveresov 已提交
1189

1190 1191 1192 1193 1194
  assert(i->as_Goto() == NULL ||
         (i->as_Goto()->sux_at(0) == tsux  && i->as_Goto()->is_safepoint() == tsux->bci() < stream()->cur_bci()) ||
         (i->as_Goto()->sux_at(0) == fsux  && i->as_Goto()->is_safepoint() == fsux->bci() < stream()->cur_bci()),
         "safepoint state of Goto returned by canonicalizer incorrect");

I
iveresov 已提交
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216
  if (is_profiling()) {
    If* if_node = i->as_If();
    if (if_node != NULL) {
      // Note that we'd collect profile data in this method if we wanted it.
      compilation()->set_would_profile(true);
      // At level 2 we need the proper bci to count backedges
      if_node->set_profiled_bci(bci());
      if (profile_branches()) {
        // Successors can be rotated by the canonicalizer, check for this case.
        if_node->set_profiled_method(method());
        if_node->set_should_profile(true);
        if (if_node->tsux() == fsux) {
          if_node->set_swapped(true);
        }
      }
      return;
    }

    // Check if this If was reduced to Goto.
    Goto *goto_node = i->as_Goto();
    if (goto_node != NULL) {
      compilation()->set_would_profile(true);
1217
      goto_node->set_profiled_bci(bci());
I
iveresov 已提交
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
      if (profile_branches()) {
        goto_node->set_profiled_method(method());
        goto_node->set_should_profile(true);
        // Find out which successor is used.
        if (goto_node->default_sux() == tsux) {
          goto_node->set_direction(Goto::taken);
        } else if (goto_node->default_sux() == fsux) {
          goto_node->set_direction(Goto::not_taken);
        } else {
          ShouldNotReachHere();
        }
      }
      return;
    }
D
duke 已提交
1232 1233 1234 1235 1236 1237
  }
}


void GraphBuilder::if_zero(ValueType* type, If::Condition cond) {
  Value y = append(new Constant(intZero));
R
roland 已提交
1238
  ValueStack* state_before = copy_state_before();
D
duke 已提交
1239 1240 1241 1242 1243 1244 1245
  Value x = ipop();
  if_node(x, cond, y, state_before);
}


void GraphBuilder::if_null(ValueType* type, If::Condition cond) {
  Value y = append(new Constant(objectNull));
R
roland 已提交
1246
  ValueStack* state_before = copy_state_before();
D
duke 已提交
1247 1248 1249 1250 1251 1252
  Value x = apop();
  if_node(x, cond, y, state_before);
}


void GraphBuilder::if_same(ValueType* type, If::Condition cond) {
R
roland 已提交
1253
  ValueStack* state_before = copy_state_before();
D
duke 已提交
1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
  Value y = pop(type);
  Value x = pop(type);
  if_node(x, cond, y, state_before);
}


void GraphBuilder::jsr(int dest) {
  // We only handle well-formed jsrs (those which are "block-structured").
  // If the bytecodes are strange (jumping out of a jsr block) then we
  // might end up trying to re-parse a block containing a jsr which
  // has already been activated. Watch for this case and bail out.
  for (ScopeData* cur_scope_data = scope_data();
       cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
       cur_scope_data = cur_scope_data->parent()) {
    if (cur_scope_data->jsr_entry_bci() == dest) {
      BAILOUT("too-complicated jsr/ret structure");
    }
  }

  push(addressType, append(new Constant(new AddressConstant(next_bci()))));
  if (!try_inline_jsr(dest)) {
    return; // bailed out while parsing and inlining subroutine
  }
}


void GraphBuilder::ret(int local_index) {
  if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine");

  if (local_index != scope_data()->jsr_return_address_local()) {
    BAILOUT("can not handle complicated jsr/ret constructs");
  }

  // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation
  append(new Goto(scope_data()->jsr_continuation(), false));
}


void GraphBuilder::table_switch() {
1293 1294
  Bytecode_tableswitch sw(stream());
  const int l = sw.length();
D
duke 已提交
1295 1296 1297 1298
  if (CanonicalizeNodes && l == 1) {
    // total of 2 successors => use If instead of switch
    // Note: This code should go into the canonicalizer as soon as it can
    //       can handle canonicalized forms that contain more than one node.
1299 1300 1301
    Value key = append(new Constant(new IntConstant(sw.low_key())));
    BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0));
    BlockBegin* fsux = block_at(bci() + sw.default_offset());
D
duke 已提交
1302
    bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1303 1304 1305
    // In case of loop invariant code motion or predicate insertion
    // before the body of a loop the state is needed
    ValueStack* state_before = copy_state_if_bb(is_bb);
D
duke 已提交
1306 1307 1308 1309 1310 1311 1312
    append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
  } else {
    // collect successors
    BlockList* sux = new BlockList(l + 1, NULL);
    int i;
    bool has_bb = false;
    for (i = 0; i < l; i++) {
1313 1314
      sux->at_put(i, block_at(bci() + sw.dest_offset_at(i)));
      if (sw.dest_offset_at(i) < 0) has_bb = true;
D
duke 已提交
1315 1316
    }
    // add default successor
1317
    if (sw.default_offset() < 0) has_bb = true;
1318
    sux->at_put(i, block_at(bci() + sw.default_offset()));
1319 1320 1321
    // In case of loop invariant code motion or predicate insertion
    // before the body of a loop the state is needed
    ValueStack* state_before = copy_state_if_bb(has_bb);
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
    Instruction* res = append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb));
#ifdef ASSERT
    if (res->as_Goto()) {
      for (i = 0; i < l; i++) {
        if (sux->at(i) == res->as_Goto()->sux_at(0)) {
          assert(res->as_Goto()->is_safepoint() == sw.dest_offset_at(i) < 0, "safepoint state of Goto returned by canonicalizer incorrect");
        }
      }
    }
#endif
D
duke 已提交
1332 1333 1334 1335 1336
  }
}


void GraphBuilder::lookup_switch() {
1337 1338
  Bytecode_lookupswitch sw(stream());
  const int l = sw.number_of_pairs();
D
duke 已提交
1339 1340 1341 1342 1343
  if (CanonicalizeNodes && l == 1) {
    // total of 2 successors => use If instead of switch
    // Note: This code should go into the canonicalizer as soon as it can
    //       can handle canonicalized forms that contain more than one node.
    // simplify to If
1344 1345 1346 1347
    LookupswitchPair pair = sw.pair_at(0);
    Value key = append(new Constant(new IntConstant(pair.match())));
    BlockBegin* tsux = block_at(bci() + pair.offset());
    BlockBegin* fsux = block_at(bci() + sw.default_offset());
D
duke 已提交
1348
    bool is_bb = tsux->bci() < bci() || fsux->bci() < bci();
1349 1350 1351
    // In case of loop invariant code motion or predicate insertion
    // before the body of a loop the state is needed
    ValueStack* state_before = copy_state_if_bb(is_bb);;
D
duke 已提交
1352 1353 1354 1355 1356 1357 1358 1359
    append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb));
  } else {
    // collect successors & keys
    BlockList* sux = new BlockList(l + 1, NULL);
    intArray* keys = new intArray(l, 0);
    int i;
    bool has_bb = false;
    for (i = 0; i < l; i++) {
1360 1361 1362 1363
      LookupswitchPair pair = sw.pair_at(i);
      if (pair.offset() < 0) has_bb = true;
      sux->at_put(i, block_at(bci() + pair.offset()));
      keys->at_put(i, pair.match());
D
duke 已提交
1364 1365
    }
    // add default successor
1366
    if (sw.default_offset() < 0) has_bb = true;
1367
    sux->at_put(i, block_at(bci() + sw.default_offset()));
1368 1369 1370
    // In case of loop invariant code motion or predicate insertion
    // before the body of a loop the state is needed
    ValueStack* state_before = copy_state_if_bb(has_bb);
1371 1372 1373 1374 1375 1376 1377 1378 1379 1380
    Instruction* res = append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb));
#ifdef ASSERT
    if (res->as_Goto()) {
      for (i = 0; i < l; i++) {
        if (sux->at(i) == res->as_Goto()->sux_at(0)) {
          assert(res->as_Goto()->is_safepoint() == sw.pair_at(i).offset() < 0, "safepoint state of Goto returned by canonicalizer incorrect");
        }
      }
    }
#endif
D
duke 已提交
1381 1382 1383 1384 1385 1386 1387 1388
  }
}

void GraphBuilder::call_register_finalizer() {
  // If the receiver requires finalization then emit code to perform
  // the registration on return.

  // Gather some type information about the receiver
R
roland 已提交
1389
  Value receiver = state()->local_at(0);
D
duke 已提交
1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421
  assert(receiver != NULL, "must have a receiver");
  ciType* declared_type = receiver->declared_type();
  ciType* exact_type = receiver->exact_type();
  if (exact_type == NULL &&
      receiver->as_Local() &&
      receiver->as_Local()->java_index() == 0) {
    ciInstanceKlass* ik = compilation()->method()->holder();
    if (ik->is_final()) {
      exact_type = ik;
    } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) {
      // test class is leaf class
      compilation()->dependency_recorder()->assert_leaf_type(ik);
      exact_type = ik;
    } else {
      declared_type = ik;
    }
  }

  // see if we know statically that registration isn't required
  bool needs_check = true;
  if (exact_type != NULL) {
    needs_check = exact_type->as_instance_klass()->has_finalizer();
  } else if (declared_type != NULL) {
    ciInstanceKlass* ik = declared_type->as_instance_klass();
    if (!Dependencies::has_finalizable_subclass(ik)) {
      compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik);
      needs_check = false;
    }
  }

  if (needs_check) {
    // Perform the registration of finalizable objects.
R
roland 已提交
1422
    ValueStack* state_before = copy_state_for_exception();
D
duke 已提交
1423 1424 1425
    load_local(objectType, 0);
    append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init,
                               state()->pop_arguments(1),
R
roland 已提交
1426
                               true, state_before, true));
D
duke 已提交
1427 1428 1429 1430 1431 1432 1433 1434 1435 1436
  }
}


void GraphBuilder::method_return(Value x) {
  if (RegisterFinalizersAtInit &&
      method()->intrinsic_id() == vmIntrinsics::_Object_init) {
    call_register_finalizer();
  }

1437 1438 1439 1440 1441 1442
  bool need_mem_bar = false;
  if (method()->name() == ciSymbol::object_initializer_name() &&
      scope()->wrote_final()) {
    need_mem_bar = true;
  }

D
duke 已提交
1443 1444 1445 1446 1447
  // Check to see whether we are inlining. If so, Return
  // instructions become Gotos to the continuation point.
  if (continuation() != NULL) {
    assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet");

1448 1449 1450
    if (compilation()->env()->dtrace_method_probes()) {
      // Report exit from inline methods
      Values* args = new Values(1);
1451
      args->push(append(new Constant(new MethodConstant(method()))));
1452 1453 1454
      append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args));
    }

D
duke 已提交
1455 1456 1457
    // If the inlined method is synchronized, the monitor must be
    // released before we jump to the continuation block.
    if (method()->is_synchronized()) {
R
roland 已提交
1458 1459
      assert(state()->locks_size() == 1, "receiver must be locked here");
      monitorexit(state()->lock_at(0), SynchronizationEntryBCI);
D
duke 已提交
1460 1461
    }

1462 1463 1464 1465
    if (need_mem_bar) {
      append(new MemBar(lir_membar_storestore));
    }

R
roland 已提交
1466 1467 1468 1469
    // State at end of inlined method is the state of the caller
    // without the method parameters on stack, including the
    // return value, if any, of the inlined method on operand stack.
    set_state(state()->caller_state()->copy_for_parsing());
D
duke 已提交
1470 1471 1472 1473 1474 1475 1476 1477
    if (x != NULL) {
      state()->push(x->type(), x);
    }
    Goto* goto_callee = new Goto(continuation(), false);

    // See whether this is the first return; if so, store off some
    // of the state for later examination
    if (num_returns() == 0) {
1478
      set_inline_cleanup_info();
D
duke 已提交
1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499
    }

    // The current bci() is in the wrong scope, so use the bci() of
    // the continuation point.
    append_with_bci(goto_callee, scope_data()->continuation()->bci());
    incr_num_returns();
    return;
  }

  state()->truncate_stack(0);
  if (method()->is_synchronized()) {
    // perform the unlocking before exiting the method
    Value receiver;
    if (!method()->is_static()) {
      receiver = _initial_state->local_at(0);
    } else {
      receiver = append(new Constant(new ClassConstant(method()->holder())));
    }
    append_split(new MonitorExit(receiver, state()->unlock()));
  }

1500 1501 1502 1503
  if (need_mem_bar) {
      append(new MemBar(lir_membar_storestore));
  }

D
duke 已提交
1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514
  append(new Return(x));
}


void GraphBuilder::access_field(Bytecodes::Code code) {
  bool will_link;
  ciField* field = stream()->get_field(will_link);
  ciInstanceKlass* holder = field->holder();
  BasicType field_type = field->type()->basic_type();
  ValueType* type = as_ValueType(field_type);
  // call will_link again to determine if the field is valid.
1515 1516 1517
  const bool needs_patching = !holder->is_loaded() ||
                              !field->will_link(method()->holder(), code) ||
                              PatchALot;
D
duke 已提交
1518

R
roland 已提交
1519
  ValueStack* state_before = NULL;
1520
  if (!holder->is_initialized() || needs_patching) {
D
duke 已提交
1521 1522
    // save state before instruction for debug info when
    // deoptimization happens during patching
R
roland 已提交
1523
    state_before = copy_state_before();
D
duke 已提交
1524 1525 1526 1527
  }

  Value obj = NULL;
  if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) {
R
roland 已提交
1528
    if (state_before != NULL) {
D
duke 已提交
1529
      // build a patching constant
1530
      obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before);
D
duke 已提交
1531
    } else {
1532
      obj = new Constant(new InstanceConstant(holder->java_mirror()));
D
duke 已提交
1533 1534 1535
    }
  }

1536 1537 1538
  if (field->is_final() && (code == Bytecodes::_putfield)) {
    scope()->set_wrote_final();
  }
D
duke 已提交
1539

1540
  const int offset = !needs_patching ? field->offset() : -1;
D
duke 已提交
1541 1542 1543 1544 1545 1546 1547 1548 1549 1550
  switch (code) {
    case Bytecodes::_getstatic: {
      // check for compile-time constants, i.e., initialized static final fields
      Instruction* constant = NULL;
      if (field->is_constant() && !PatchALot) {
        ciConstant field_val = field->constant_value();
        BasicType field_type = field_val.basic_type();
        switch (field_type) {
        case T_ARRAY:
        case T_OBJECT:
1551
          if (field_val.as_object()->should_be_constant()) {
1552
            constant = new Constant(as_ValueType(field_val));
D
duke 已提交
1553 1554 1555 1556 1557 1558 1559 1560 1561 1562
          }
          break;

        default:
          constant = new Constant(as_ValueType(field_val));
        }
      }
      if (constant != NULL) {
        push(type, append(constant));
      } else {
R
roland 已提交
1563 1564 1565
        if (state_before == NULL) {
          state_before = copy_state_for_exception();
        }
D
duke 已提交
1566
        push(type, append(new LoadField(append(obj), offset, field, true,
1567
                                        state_before, needs_patching)));
D
duke 已提交
1568 1569 1570 1571 1572
      }
      break;
    }
    case Bytecodes::_putstatic:
      { Value val = pop(type);
R
roland 已提交
1573 1574 1575
        if (state_before == NULL) {
          state_before = copy_state_for_exception();
        }
1576
        append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching));
D
duke 已提交
1577 1578
      }
      break;
1579 1580 1581 1582 1583 1584 1585
    case Bytecodes::_getfield: {
      // Check for compile-time constants, i.e., trusted final non-static fields.
      Instruction* constant = NULL;
      obj = apop();
      ObjectType* obj_type = obj->type()->as_ObjectType();
      if (obj_type->is_constant() && !PatchALot) {
        ciObject* const_oop = obj_type->constant_value();
1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597
        if (!const_oop->is_null_object()) {
          if (field->is_constant()) {
            ciConstant field_val = field->constant_value_of(const_oop);
            BasicType field_type = field_val.basic_type();
            switch (field_type) {
            case T_ARRAY:
            case T_OBJECT:
              if (field_val.as_object()->should_be_constant()) {
                constant = new Constant(as_ValueType(field_val));
              }
              break;
            default:
1598 1599
              constant = new Constant(as_ValueType(field_val));
            }
1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612
          } else {
            // For CallSite objects treat the target field as a compile time constant.
            if (const_oop->is_call_site()) {
              ciCallSite* call_site = const_oop->as_call_site();
              if (field->is_call_site_target()) {
                ciMethodHandle* target = call_site->get_target();
                if (target != NULL) {  // just in case
                  ciConstant field_val(T_OBJECT, target);
                  constant = new Constant(as_ValueType(field_val));
                  // Add a dependence for invalidation of the optimization.
                  if (!call_site->is_constant_call_site()) {
                    dependency_recorder()->assert_call_site_target_value(call_site, target);
                  }
1613 1614 1615 1616 1617 1618 1619 1620 1621
                }
              }
            }
          }
        }
      }
      if (constant != NULL) {
        push(type, append(constant));
      } else {
R
roland 已提交
1622 1623 1624
        if (state_before == NULL) {
          state_before = copy_state_for_exception();
        }
1625
        LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching);
1626
        Value replacement = !needs_patching ? _memory->load(load) : load;
D
duke 已提交
1627
        if (replacement != load) {
R
roland 已提交
1628
          assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked");
D
duke 已提交
1629 1630 1631 1632 1633
          push(type, replacement);
        } else {
          push(type, append(load));
        }
      }
1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645
      break;
    }
    case Bytecodes::_putfield: {
      Value val = pop(type);
      obj = apop();
      if (state_before == NULL) {
        state_before = copy_state_for_exception();
      }
      StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching);
      if (!needs_patching) store = _memory->store(store);
      if (store != NULL) {
        append(store);
D
duke 已提交
1646 1647
      }
      break;
1648 1649
    }
    default:
D
duke 已提交
1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663
      ShouldNotReachHere();
      break;
  }
}


Dependencies* GraphBuilder::dependency_recorder() const {
  assert(DeoptC1, "need debug information");
  return compilation()->dependency_recorder();
}


void GraphBuilder::invoke(Bytecodes::Code code) {
  bool will_link;
1664 1665
  ciSignature* declared_signature = NULL;
  ciMethod*             target = stream()->get_method(will_link, &declared_signature);
1666 1667
  ciKlass*              holder = stream()->get_declared_method_holder();
  const Bytecodes::Code bc_raw = stream()->cur_bc_raw();
1668
  assert(declared_signature != NULL, "cannot be null");
1669 1670

  // FIXME bail out for now
1671
  if (Bytecodes::has_optional_appendix(bc_raw) && !will_link) {
1672 1673 1674
    BAILOUT("unlinked call site (FIXME needs patching or recompile support)");
  }

D
duke 已提交
1675 1676 1677
  // we have to make sure the argument size (incl. the receiver)
  // is correct for compilation (the call would fail later during
  // linkage anyway) - was bug (gri 7/28/99)
1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691
  {
    // Use raw to get rewritten bytecode.
    const bool is_invokestatic = bc_raw == Bytecodes::_invokestatic;
    const bool allow_static =
          is_invokestatic ||
          bc_raw == Bytecodes::_invokehandle ||
          bc_raw == Bytecodes::_invokedynamic;
    if (target->is_loaded()) {
      if (( target->is_static() && !allow_static) ||
          (!target->is_static() &&  is_invokestatic)) {
        BAILOUT("will cause link error");
      }
    }
  }
D
duke 已提交
1692 1693 1694 1695 1696 1697 1698
  ciInstanceKlass* klass = target->holder();

  // check if CHA possible: if so, change the code to invoke_special
  ciInstanceKlass* calling_klass = method()->holder();
  ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder);
  ciInstanceKlass* actual_recv = callee_holder;

V
vlivanov 已提交
1699 1700 1701 1702 1703 1704
  CompileLog* log = compilation()->log();
  if (log != NULL)
      log->elem("call method='%d' instr='%s'",
                log->identify(target),
                Bytecodes::name(code));

1705 1706 1707 1708
  // Some methods are obviously bindable without any type checks so
  // convert them directly to an invokespecial or invokestatic.
  if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) {
    switch (bc_raw) {
1709 1710 1711 1712 1713 1714
    case Bytecodes::_invokevirtual:
      code = Bytecodes::_invokespecial;
      break;
    case Bytecodes::_invokehandle:
      code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial;
      break;
1715
    }
D
duke 已提交
1716 1717
  }

1718 1719 1720 1721 1722 1723
  // Push appendix argument (MethodType, CallSite, etc.), if one.
  if (stream()->has_appendix()) {
    ciObject* appendix = stream()->get_appendix();
    Value arg = append(new Constant(new ObjectConstant(appendix)));
    apush(arg);
  }
1724

D
duke 已提交
1725
  // NEEDS_CLEANUP
1726
  // I've added the target->is_loaded() test below but I don't really understand
D
duke 已提交
1727 1728 1729 1730
  // how klass->is_loaded() can be true and yet target->is_loaded() is false.
  // this happened while running the JCK invokevirtual tests under doit.  TKR
  ciMethod* cha_monomorphic_target = NULL;
  ciMethod* exact_target = NULL;
1731
  Value better_receiver = NULL;
1732
  if (UseCHA && DeoptC1 && klass->is_loaded() && target->is_loaded() &&
1733 1734 1735
      !(// %%% FIXME: Are both of these relevant?
        target->is_method_handle_intrinsic() ||
        target->is_compiled_lambda_form())) {
D
duke 已提交
1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793
    Value receiver = NULL;
    ciInstanceKlass* receiver_klass = NULL;
    bool type_is_exact = false;
    // try to find a precise receiver type
    if (will_link && !target->is_static()) {
      int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
      receiver = state()->stack_at(index);
      ciType* type = receiver->exact_type();
      if (type != NULL && type->is_loaded() &&
          type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
        receiver_klass = (ciInstanceKlass*) type;
        type_is_exact = true;
      }
      if (type == NULL) {
        type = receiver->declared_type();
        if (type != NULL && type->is_loaded() &&
            type->is_instance_klass() && !type->as_instance_klass()->is_interface()) {
          receiver_klass = (ciInstanceKlass*) type;
          if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) {
            // Insert a dependency on this type since
            // find_monomorphic_target may assume it's already done.
            dependency_recorder()->assert_leaf_type(receiver_klass);
            type_is_exact = true;
          }
        }
      }
    }
    if (receiver_klass != NULL && type_is_exact &&
        receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) {
      // If we have the exact receiver type we can bind directly to
      // the method to call.
      exact_target = target->resolve_invoke(calling_klass, receiver_klass);
      if (exact_target != NULL) {
        target = exact_target;
        code = Bytecodes::_invokespecial;
      }
    }
    if (receiver_klass != NULL &&
        receiver_klass->is_subtype_of(actual_recv) &&
        actual_recv->is_initialized()) {
      actual_recv = receiver_klass;
    }

    if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) ||
        (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) {
      // Use CHA on the receiver to select a more precise method.
      cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv);
    } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != NULL) {
      // if there is only one implementor of this interface then we
      // may be able bind this invoke directly to the implementing
      // klass but we need both a dependence on the single interface
      // and on the method we bind to.  Additionally since all we know
      // about the receiver type is the it's supposed to implement the
      // interface we have to insert a check that it's the class we
      // expect.  Interface types are not checked by the verifier so
      // they are roughly equivalent to Object.
      ciInstanceKlass* singleton = NULL;
      if (target->holder()->nof_implementors() == 1) {
1794 1795 1796
        singleton = target->holder()->implementor();
        assert(singleton != NULL && singleton != target->holder(),
               "just checking");
1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808

        assert(holder->is_interface(), "invokeinterface to non interface?");
        ciInstanceKlass* decl_interface = (ciInstanceKlass*)holder;
        // the number of implementors for decl_interface is less or
        // equal to the number of implementors for target->holder() so
        // if number of implementors of target->holder() == 1 then
        // number of implementors for decl_interface is 0 or 1. If
        // it's 0 then no class implements decl_interface and there's
        // no point in inlining.
        if (!holder->is_loaded() || decl_interface->nof_implementors() != 1) {
          singleton = NULL;
        }
D
duke 已提交
1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819
      }
      if (singleton) {
        cha_monomorphic_target = target->find_monomorphic_target(calling_klass, target->holder(), singleton);
        if (cha_monomorphic_target != NULL) {
          // If CHA is able to bind this invoke then update the class
          // to match that class, otherwise klass will refer to the
          // interface.
          klass = cha_monomorphic_target->holder();
          actual_recv = target->holder();

          // insert a check it's really the expected class.
R
roland 已提交
1820
          CheckCast* c = new CheckCast(klass, receiver, copy_state_for_exception());
D
duke 已提交
1821 1822
          c->set_incompatible_class_change_check();
          c->set_direct_compare(klass->is_final());
1823 1824 1825
          // pass the result of the checkcast so that the compiler has
          // more accurate type info in the inlinee
          better_receiver = append_split(c);
D
duke 已提交
1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848
        }
      }
    }
  }

  if (cha_monomorphic_target != NULL) {
    if (cha_monomorphic_target->is_abstract()) {
      // Do not optimize for abstract methods
      cha_monomorphic_target = NULL;
    }
  }

  if (cha_monomorphic_target != NULL) {
    if (!(target->is_final_method())) {
      // If we inlined because CHA revealed only a single target method,
      // then we are dependent on that target method not getting overridden
      // by dynamic class loading.  Be sure to test the "static" receiver
      // dest_method here, as opposed to the actual receiver, which may
      // falsely lead us to believe that the receiver is final or private.
      dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target);
    }
    code = Bytecodes::_invokespecial;
  }
V
vlivanov 已提交
1849

D
duke 已提交
1850 1851 1852
  // check if we could do inlining
  if (!PatchALot && Inline && klass->is_loaded() &&
      (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized())
B
bharadwaj 已提交
1853
      && target->is_loaded()) {
D
duke 已提交
1854 1855
    // callee is known => check if we have static binding
    assert(target->is_loaded(), "callee must be known");
1856 1857 1858 1859 1860
    if (code == Bytecodes::_invokestatic  ||
        code == Bytecodes::_invokespecial ||
        code == Bytecodes::_invokevirtual && target->is_final_method() ||
        code == Bytecodes::_invokedynamic) {
      ciMethod* inline_target = (cha_monomorphic_target != NULL) ? cha_monomorphic_target : target;
1861 1862
      // static binding => check if callee is ok
      bool success = try_inline(inline_target, (cha_monomorphic_target != NULL) || (exact_target != NULL), code, better_receiver);
D
duke 已提交
1863

1864
      CHECK_BAILOUT();
D
duke 已提交
1865
      clear_inline_bailout();
1866

1867
      if (success) {
D
duke 已提交
1868 1869 1870
        // Register dependence if JVMTI has either breakpoint
        // setting or hotswapping of methods capabilities since they may
        // cause deoptimization.
1871
        if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) {
D
duke 已提交
1872 1873 1874 1875
          dependency_recorder()->assert_evol_method(inline_target);
        }
        return;
      }
1876 1877
    } else {
      print_inlining(target, "no static binding", /*success*/ false);
D
duke 已提交
1878
    }
1879 1880
  } else {
    print_inlining(target, "not inlineable", /*success*/ false);
D
duke 已提交
1881
  }
1882

D
duke 已提交
1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894
  // If we attempted an inline which did not succeed because of a
  // bailout during construction of the callee graph, the entire
  // compilation has to be aborted. This is fairly rare and currently
  // seems to only occur for jasm-generated classes which contain
  // jsr/ret pairs which are not associated with finally clauses and
  // do not have exception handlers in the containing method, and are
  // therefore not caught early enough to abort the inlining without
  // corrupting the graph. (We currently bail out with a non-empty
  // stack at a ret in these situations.)
  CHECK_BAILOUT();

  // inlining not successful => standard invoke
1895
  bool is_loaded = target->is_loaded();
1896
  ValueType* result_type = as_ValueType(declared_signature->return_type());
1897
  ValueStack* state_before = copy_state_exhandling();
1898

1899 1900 1901 1902 1903
  // The bytecode (code) might change in this method so we are checking this very late.
  const bool has_receiver =
    code == Bytecodes::_invokespecial   ||
    code == Bytecodes::_invokevirtual   ||
    code == Bytecodes::_invokeinterface;
D
duke 已提交
1904
  Values* args = state()->pop_arguments(target->arg_size_no_receiver());
1905
  Value recv = has_receiver ? apop() : NULL;
1906
  int vtable_index = Method::invalid_vtable_index;
D
duke 已提交
1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920

#ifdef SPARC
  // Currently only supported on Sparc.
  // The UseInlineCaches only controls dispatch to invokevirtuals for
  // loaded classes which we weren't able to statically bind.
  if (!UseInlineCaches && is_loaded && code == Bytecodes::_invokevirtual
      && !target->can_be_statically_bound()) {
    // Find a vtable index if one is available
    vtable_index = target->resolve_vtable_index(calling_klass, callee_holder);
  }
#endif

  if (recv != NULL &&
      (code == Bytecodes::_invokespecial ||
I
iveresov 已提交
1921
       !is_loaded || target->is_final())) {
D
duke 已提交
1922 1923 1924 1925 1926 1927 1928 1929 1930
    // invokespecial always needs a NULL check.  invokevirtual where
    // the target is final or where it's not known that whether the
    // target is final requires a NULL check.  Otherwise normal
    // invokevirtual will perform the null check during the lookup
    // logic or the unverified entry point.  Profiling of calls
    // requires that the null check is performed in all cases.
    null_check(recv);
  }

I
iveresov 已提交
1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945
  if (is_profiling()) {
    if (recv != NULL && profile_calls()) {
      null_check(recv);
    }
    // Note that we'd collect profile data in this method if we wanted it.
    compilation()->set_would_profile(true);

    if (profile_calls()) {
      assert(cha_monomorphic_target == NULL || exact_target == NULL, "both can not be set");
      ciKlass* target_klass = NULL;
      if (cha_monomorphic_target != NULL) {
        target_klass = cha_monomorphic_target->holder();
      } else if (exact_target != NULL) {
        target_klass = exact_target->holder();
      }
1946
      profile_call(target, recv, target_klass);
D
duke 已提交
1947 1948 1949
    }
  }

1950
  Invoke* result = new Invoke(code, result_type, recv, args, vtable_index, target, state_before);
D
duke 已提交
1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964
  // push result
  append_split(result);

  if (result_type != voidType) {
    if (method()->is_strict()) {
      push(result_type, round_fp(result));
    } else {
      push(result_type, result);
    }
  }
}


void GraphBuilder::new_instance(int klass_index) {
R
roland 已提交
1965
  ValueStack* state_before = copy_state_exhandling();
D
duke 已提交
1966 1967 1968
  bool will_link;
  ciKlass* klass = stream()->get_klass(will_link);
  assert(klass->is_instance_klass(), "must be an instance klass");
R
roland 已提交
1969
  NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before);
D
duke 已提交
1970 1971 1972 1973 1974 1975
  _memory->new_instance(new_instance);
  apush(append_split(new_instance));
}


void GraphBuilder::new_type_array() {
R
roland 已提交
1976 1977
  ValueStack* state_before = copy_state_exhandling();
  apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before)));
D
duke 已提交
1978 1979 1980 1981 1982 1983
}


void GraphBuilder::new_object_array() {
  bool will_link;
  ciKlass* klass = stream()->get_klass(will_link);
R
roland 已提交
1984
  ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
D
duke 已提交
1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
  NewArray* n = new NewObjectArray(klass, ipop(), state_before);
  apush(append_split(n));
}


bool GraphBuilder::direct_compare(ciKlass* k) {
  if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) {
    ciInstanceKlass* ik = k->as_instance_klass();
    if (ik->is_final()) {
      return true;
    } else {
      if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) {
        // test class is leaf class
        dependency_recorder()->assert_leaf_type(ik);
        return true;
      }
    }
  }
  return false;
}


void GraphBuilder::check_cast(int klass_index) {
  bool will_link;
  ciKlass* klass = stream()->get_klass(will_link);
R
roland 已提交
2010
  ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception();
D
duke 已提交
2011 2012 2013
  CheckCast* c = new CheckCast(klass, apop(), state_before);
  apush(append_split(c));
  c->set_direct_compare(direct_compare(klass));
I
iveresov 已提交
2014 2015 2016 2017 2018 2019 2020 2021 2022 2023

  if (is_profiling()) {
    // Note that we'd collect profile data in this method if we wanted it.
    compilation()->set_would_profile(true);

    if (profile_checkcasts()) {
      c->set_profiled_method(method());
      c->set_profiled_bci(bci());
      c->set_should_profile(true);
    }
D
duke 已提交
2024 2025 2026 2027 2028 2029 2030
  }
}


void GraphBuilder::instance_of(int klass_index) {
  bool will_link;
  ciKlass* klass = stream()->get_klass(will_link);
R
roland 已提交
2031
  ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
D
duke 已提交
2032 2033 2034
  InstanceOf* i = new InstanceOf(klass, apop(), state_before);
  ipush(append_split(i));
  i->set_direct_compare(direct_compare(klass));
2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045

  if (is_profiling()) {
    // Note that we'd collect profile data in this method if we wanted it.
    compilation()->set_would_profile(true);

    if (profile_checkcasts()) {
      i->set_profiled_method(method());
      i->set_profiled_bci(bci());
      i->set_should_profile(true);
    }
  }
D
duke 已提交
2046 2047 2048 2049 2050
}


void GraphBuilder::monitorenter(Value x, int bci) {
  // save state before locking in case of deoptimization after a NullPointerException
R
roland 已提交
2051 2052
  ValueStack* state_before = copy_state_for_exception_with_bci(bci);
  append_with_bci(new MonitorEnter(x, state()->lock(x), state_before), bci);
D
duke 已提交
2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065
  kill_all();
}


void GraphBuilder::monitorexit(Value x, int bci) {
  append_with_bci(new MonitorExit(x, state()->unlock()), bci);
  kill_all();
}


void GraphBuilder::new_multi_array(int dimensions) {
  bool will_link;
  ciKlass* klass = stream()->get_klass(will_link);
R
roland 已提交
2066
  ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
D
duke 已提交
2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080

  Values* dims = new Values(dimensions, NULL);
  // fill in all dimensions
  int i = dimensions;
  while (i-- > 0) dims->at_put(i, ipop());
  // create array
  NewArray* n = new NewMultiArray(klass, dims, state_before);
  apush(append_split(n));
}


void GraphBuilder::throw_op(int bci) {
  // We require that the debug info for a Throw be the "state before"
  // the Throw (i.e., exception oop is still on TOS)
R
roland 已提交
2081
  ValueStack* state_before = copy_state_before_with_bci(bci);
D
duke 已提交
2082
  Throw* t = new Throw(apop(), state_before);
R
roland 已提交
2083 2084
  // operand stack not needed after a throw
  state()->truncate_stack(0);
D
duke 已提交
2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106
  append_with_bci(t, bci);
}


Value GraphBuilder::round_fp(Value fp_value) {
  // no rounding needed if SSE2 is used
  if (RoundFPResults && UseSSE < 2) {
    // Must currently insert rounding node for doubleword values that
    // are results of expressions (i.e., not loads from memory or
    // constants)
    if (fp_value->type()->tag() == doubleTag &&
        fp_value->as_Constant() == NULL &&
        fp_value->as_Local() == NULL &&       // method parameters need no rounding
        fp_value->as_RoundFP() == NULL) {
      return append(new RoundFP(fp_value));
    }
  }
  return fp_value;
}


Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) {
I
iveresov 已提交
2107
  Canonicalizer canon(compilation(), instr, bci);
D
duke 已提交
2108
  Instruction* i1 = canon.canonical();
R
roland 已提交
2109
  if (i1->is_linked() || !i1->can_be_linked()) {
D
duke 已提交
2110 2111 2112
    // Canonicalizer returned an instruction which was already
    // appended so simply return it.
    return i1;
R
roland 已提交
2113 2114 2115
  }

  if (UseLocalValueNumbering) {
D
duke 已提交
2116 2117 2118 2119 2120
    // Lookup the instruction in the ValueMap and add it to the map if
    // it's not found.
    Instruction* i2 = vmap()->find_insert(i1);
    if (i2 != i1) {
      // found an entry in the value map, so just return it.
R
roland 已提交
2121
      assert(i2->is_linked(), "should already be linked");
D
duke 已提交
2122 2123
      return i2;
    }
N
never 已提交
2124 2125
    ValueNumberingEffects vne(vmap());
    i1->visit(&vne);
D
duke 已提交
2126 2127
  }

R
roland 已提交
2128 2129 2130 2131 2132 2133 2134 2135 2136 2137
  // i1 was not eliminated => append it
  assert(i1->next() == NULL, "shouldn't already be linked");
  _last = _last->set_next(i1, canon.bci());

  if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) {
    // set the bailout state but complete normal processing.  We
    // might do a little more work before noticing the bailout so we
    // want processing to continue normally until it's noticed.
    bailout("Method and/or inlining is too large");
  }
D
duke 已提交
2138 2139

#ifndef PRODUCT
R
roland 已提交
2140 2141 2142 2143 2144
  if (PrintIRDuringConstruction) {
    InstructionPrinter ip;
    ip.print_line(i1);
    if (Verbose) {
      state()->print();
D
duke 已提交
2145
    }
R
roland 已提交
2146
  }
D
duke 已提交
2147
#endif
R
roland 已提交
2148 2149 2150 2151 2152 2153 2154 2155

  // save state after modification of operand stack for StateSplit instructions
  StateSplit* s = i1->as_StateSplit();
  if (s != NULL) {
    if (EliminateFieldAccess) {
      Intrinsic* intrinsic = s->as_Intrinsic();
      if (s->as_Invoke() != NULL || (intrinsic && !intrinsic->preserves_state())) {
        _memory->kill();
D
duke 已提交
2156 2157
      }
    }
R
roland 已提交
2158 2159 2160 2161 2162 2163 2164
    s->set_state(state()->copy(ValueStack::StateAfter, canon.bci()));
  }

  // set up exception handlers for this instruction if necessary
  if (i1->can_trap()) {
    i1->set_exception_handlers(handle_exception(i1));
    assert(i1->exception_state() != NULL || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state");
D
duke 已提交
2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
  }
  return i1;
}


Instruction* GraphBuilder::append(Instruction* instr) {
  assert(instr->as_StateSplit() == NULL || instr->as_BlockEnd() != NULL, "wrong append used");
  return append_with_bci(instr, bci());
}


Instruction* GraphBuilder::append_split(StateSplit* instr) {
  return append_with_bci(instr, bci());
}


void GraphBuilder::null_check(Value value) {
  if (value->as_NewArray() != NULL || value->as_NewInstance() != NULL) {
    return;
  } else {
    Constant* con = value->as_Constant();
    if (con) {
      ObjectType* c = con->type()->as_ObjectType();
      if (c && c->is_loaded()) {
        ObjectConstant* oc = c->as_ObjectConstant();
        if (!oc || !oc->value()->is_null_object()) {
          return;
        }
      }
    }
  }
R
roland 已提交
2196
  append(new NullCheck(value, copy_state_for_exception()));
D
duke 已提交
2197 2198 2199 2200
}



R
roland 已提交
2201 2202 2203 2204 2205 2206
XHandlers* GraphBuilder::handle_exception(Instruction* instruction) {
  if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != NULL)) {
    assert(instruction->exception_state() == NULL
           || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState
           || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->jvmti_can_access_local_variables()),
           "exception_state should be of exception kind");
D
duke 已提交
2207 2208 2209 2210 2211
    return new XHandlers();
  }

  XHandlers*  exception_handlers = new XHandlers();
  ScopeData*  cur_scope_data = scope_data();
R
roland 已提交
2212 2213
  ValueStack* cur_state = instruction->state_before();
  ValueStack* prev_state = NULL;
D
duke 已提交
2214 2215
  int scope_count = 0;

R
roland 已提交
2216
  assert(cur_state != NULL, "state_before must be set");
D
duke 已提交
2217
  do {
R
roland 已提交
2218 2219
    int cur_bci = cur_state->bci();
    assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
D
duke 已提交
2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242
    assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci(), "invalid bci");

    // join with all potential exception handlers
    XHandlers* list = cur_scope_data->xhandlers();
    const int n = list->length();
    for (int i = 0; i < n; i++) {
      XHandler* h = list->handler_at(i);
      if (h->covers(cur_bci)) {
        // h is a potential exception handler => join it
        compilation()->set_has_exception_handlers(true);

        BlockBegin* entry = h->entry_block();
        if (entry == block()) {
          // It's acceptable for an exception handler to cover itself
          // but we don't handle that in the parser currently.  It's
          // very rare so we bailout instead of trying to handle it.
          BAILOUT_("exception handler covers itself", exception_handlers);
        }
        assert(entry->bci() == h->handler_bci(), "must match");
        assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond");

        // previously this was a BAILOUT, but this is not necessary
        // now because asynchronous exceptions are not handled this way.
R
roland 已提交
2243
        assert(entry->state() == NULL || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match");
D
duke 已提交
2244 2245

        // xhandler start with an empty expression stack
R
roland 已提交
2246 2247 2248 2249 2250 2251
        if (cur_state->stack_size() != 0) {
          cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
        }
        if (instruction->exception_state() == NULL) {
          instruction->set_exception_state(cur_state);
        }
D
duke 已提交
2252 2253 2254 2255 2256 2257 2258 2259

        // Note: Usually this join must work. However, very
        // complicated jsr-ret structures where we don't ret from
        // the subroutine can cause the objects on the monitor
        // stacks to not match because blocks can be parsed twice.
        // The only test case we've seen so far which exhibits this
        // problem is caught by the infinite recursion test in
        // GraphBuilder::jsr() if the join doesn't work.
R
roland 已提交
2260
        if (!entry->try_merge(cur_state)) {
D
duke 已提交
2261 2262 2263 2264
          BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers);
        }

        // add current state for correct handling of phi functions at begin of xhandler
R
roland 已提交
2265
        int phi_operand = entry->add_exception_state(cur_state);
D
duke 已提交
2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291

        // add entry to the list of xhandlers of this block
        _block->add_exception_handler(entry);

        // add back-edge from xhandler entry to this block
        if (!entry->is_predecessor(_block)) {
          entry->add_predecessor(_block);
        }

        // clone XHandler because phi_operand and scope_count can not be shared
        XHandler* new_xhandler = new XHandler(h);
        new_xhandler->set_phi_operand(phi_operand);
        new_xhandler->set_scope_count(scope_count);
        exception_handlers->append(new_xhandler);

        // fill in exception handler subgraph lazily
        assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet");
        cur_scope_data->add_to_work_list(entry);

        // stop when reaching catchall
        if (h->catch_type() == 0) {
          return exception_handlers;
        }
      }
    }

R
roland 已提交
2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308
    if (exception_handlers->length() == 0) {
      // This scope and all callees do not handle exceptions, so the local
      // variables of this scope are not needed. However, the scope itself is
      // required for a correct exception stack trace -> clear out the locals.
      if (_compilation->env()->jvmti_can_access_local_variables()) {
        cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci());
      } else {
        cur_state = cur_state->copy(ValueStack::EmptyExceptionState, cur_state->bci());
      }
      if (prev_state != NULL) {
        prev_state->set_caller_state(cur_state);
      }
      if (instruction->exception_state() == NULL) {
        instruction->set_exception_state(cur_state);
      }
    }

D
duke 已提交
2309 2310 2311 2312
    // Set up iteration for next time.
    // If parsing a jsr, do not grab exception handlers from the
    // parent scopes for this method (already got them, and they
    // needed to be cloned)
R
roland 已提交
2313 2314

    while (cur_scope_data->parsing_jsr()) {
D
duke 已提交
2315 2316
      cur_scope_data = cur_scope_data->parent();
    }
R
roland 已提交
2317 2318 2319 2320 2321 2322 2323 2324

    assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
    assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler");

    prev_state = cur_state;
    cur_state = cur_state->caller_state();
    cur_scope_data = cur_scope_data->parent();
    scope_count++;
D
duke 已提交
2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428
  } while (cur_scope_data != NULL);

  return exception_handlers;
}


// Helper class for simplifying Phis.
class PhiSimplifier : public BlockClosure {
 private:
  bool _has_substitutions;
  Value simplify(Value v);

 public:
  PhiSimplifier(BlockBegin* start) : _has_substitutions(false) {
    start->iterate_preorder(this);
    if (_has_substitutions) {
      SubstitutionResolver sr(start);
    }
  }
  void block_do(BlockBegin* b);
  bool has_substitutions() const { return _has_substitutions; }
};


Value PhiSimplifier::simplify(Value v) {
  Phi* phi = v->as_Phi();

  if (phi == NULL) {
    // no phi function
    return v;
  } else if (v->has_subst()) {
    // already substituted; subst can be phi itself -> simplify
    return simplify(v->subst());
  } else if (phi->is_set(Phi::cannot_simplify)) {
    // already tried to simplify phi before
    return phi;
  } else if (phi->is_set(Phi::visited)) {
    // break cycles in phi functions
    return phi;
  } else if (phi->type()->is_illegal()) {
    // illegal phi functions are ignored anyway
    return phi;

  } else {
    // mark phi function as processed to break cycles in phi functions
    phi->set(Phi::visited);

    // simplify x = [y, x] and x = [y, y] to y
    Value subst = NULL;
    int opd_count = phi->operand_count();
    for (int i = 0; i < opd_count; i++) {
      Value opd = phi->operand_at(i);
      assert(opd != NULL, "Operand must exist!");

      if (opd->type()->is_illegal()) {
        // if one operand is illegal, the entire phi function is illegal
        phi->make_illegal();
        phi->clear(Phi::visited);
        return phi;
      }

      Value new_opd = simplify(opd);
      assert(new_opd != NULL, "Simplified operand must exist!");

      if (new_opd != phi && new_opd != subst) {
        if (subst == NULL) {
          subst = new_opd;
        } else {
          // no simplification possible
          phi->set(Phi::cannot_simplify);
          phi->clear(Phi::visited);
          return phi;
        }
      }
    }

    // sucessfully simplified phi function
    assert(subst != NULL, "illegal phi function");
    _has_substitutions = true;
    phi->clear(Phi::visited);
    phi->set_subst(subst);

#ifndef PRODUCT
    if (PrintPhiFunctions) {
      tty->print_cr("simplified phi function %c%d to %c%d (Block B%d)", phi->type()->tchar(), phi->id(), subst->type()->tchar(), subst->id(), phi->block()->block_id());
    }
#endif

    return subst;
  }
}


void PhiSimplifier::block_do(BlockBegin* b) {
  for_each_phi_fun(b, phi,
    simplify(phi);
  );

#ifdef ASSERT
  for_each_phi_fun(b, phi,
                   assert(phi->operand_count() != 1 || phi->subst() != phi, "missed trivial simplification");
  );

  ValueStack* state = b->state()->caller_state();
R
roland 已提交
2429 2430 2431 2432
  for_each_state_value(state, value,
    Phi* phi = value->as_Phi();
    assert(phi == NULL || phi->block() != b, "must not have phi function to simplify in caller state");
  );
D
duke 已提交
2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446
#endif
}

// This method is called after all blocks are filled with HIR instructions
// It eliminates all Phi functions of the form x = [y, y] and x = [y, x]
void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) {
  PhiSimplifier simplifier(start);
}


void GraphBuilder::connect_to_end(BlockBegin* beg) {
  // setup iteration
  kill_all();
  _block = beg;
R
roland 已提交
2447
  _state = beg->state()->copy_for_parsing();
D
duke 已提交
2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466
  _last  = beg;
  iterate_bytecodes_for_block(beg->bci());
}


BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) {
#ifndef PRODUCT
  if (PrintIRDuringConstruction) {
    tty->cr();
    InstructionPrinter ip;
    ip.print_instr(_block); tty->cr();
    ip.print_stack(_block->state()); tty->cr();
    ip.print_inline_level(_block);
    ip.print_head();
    tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size());
  }
#endif
  _skip_block = false;
  assert(state() != NULL, "ValueStack missing!");
V
vlivanov 已提交
2467
  CompileLog* log = compilation()->log();
D
duke 已提交
2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483
  ciBytecodeStream s(method());
  s.reset_to_bci(bci);
  int prev_bci = bci;
  scope_data()->set_stream(&s);
  // iterate
  Bytecodes::Code code = Bytecodes::_illegal;
  bool push_exception = false;

  if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == NULL) {
    // first thing in the exception entry block should be the exception object.
    push_exception = true;
  }

  while (!bailed_out() && last()->as_BlockEnd() == NULL &&
         (code = stream()->next()) != ciBytecodeStream::EOBC() &&
         (block_at(s.cur_bci()) == NULL || block_at(s.cur_bci()) == block())) {
R
roland 已提交
2484
    assert(state()->kind() == ValueStack::Parsing, "invalid state kind");
D
duke 已提交
2485

V
vlivanov 已提交
2486 2487 2488
    if (log != NULL)
      log->set_context("bc code='%d' bci='%d'", (int)code, s.cur_bci());

D
duke 已提交
2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611
    // Check for active jsr during OSR compilation
    if (compilation()->is_osr_compile()
        && scope()->is_top_scope()
        && parsing_jsr()
        && s.cur_bci() == compilation()->osr_bci()) {
      bailout("OSR not supported while a jsr is active");
    }

    if (push_exception) {
      apush(append(new ExceptionObject()));
      push_exception = false;
    }

    // handle bytecode
    switch (code) {
      case Bytecodes::_nop            : /* nothing to do */ break;
      case Bytecodes::_aconst_null    : apush(append(new Constant(objectNull            ))); break;
      case Bytecodes::_iconst_m1      : ipush(append(new Constant(new IntConstant   (-1)))); break;
      case Bytecodes::_iconst_0       : ipush(append(new Constant(intZero               ))); break;
      case Bytecodes::_iconst_1       : ipush(append(new Constant(intOne                ))); break;
      case Bytecodes::_iconst_2       : ipush(append(new Constant(new IntConstant   ( 2)))); break;
      case Bytecodes::_iconst_3       : ipush(append(new Constant(new IntConstant   ( 3)))); break;
      case Bytecodes::_iconst_4       : ipush(append(new Constant(new IntConstant   ( 4)))); break;
      case Bytecodes::_iconst_5       : ipush(append(new Constant(new IntConstant   ( 5)))); break;
      case Bytecodes::_lconst_0       : lpush(append(new Constant(new LongConstant  ( 0)))); break;
      case Bytecodes::_lconst_1       : lpush(append(new Constant(new LongConstant  ( 1)))); break;
      case Bytecodes::_fconst_0       : fpush(append(new Constant(new FloatConstant ( 0)))); break;
      case Bytecodes::_fconst_1       : fpush(append(new Constant(new FloatConstant ( 1)))); break;
      case Bytecodes::_fconst_2       : fpush(append(new Constant(new FloatConstant ( 2)))); break;
      case Bytecodes::_dconst_0       : dpush(append(new Constant(new DoubleConstant( 0)))); break;
      case Bytecodes::_dconst_1       : dpush(append(new Constant(new DoubleConstant( 1)))); break;
      case Bytecodes::_bipush         : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break;
      case Bytecodes::_sipush         : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break;
      case Bytecodes::_ldc            : // fall through
      case Bytecodes::_ldc_w          : // fall through
      case Bytecodes::_ldc2_w         : load_constant(); break;
      case Bytecodes::_iload          : load_local(intType     , s.get_index()); break;
      case Bytecodes::_lload          : load_local(longType    , s.get_index()); break;
      case Bytecodes::_fload          : load_local(floatType   , s.get_index()); break;
      case Bytecodes::_dload          : load_local(doubleType  , s.get_index()); break;
      case Bytecodes::_aload          : load_local(instanceType, s.get_index()); break;
      case Bytecodes::_iload_0        : load_local(intType   , 0); break;
      case Bytecodes::_iload_1        : load_local(intType   , 1); break;
      case Bytecodes::_iload_2        : load_local(intType   , 2); break;
      case Bytecodes::_iload_3        : load_local(intType   , 3); break;
      case Bytecodes::_lload_0        : load_local(longType  , 0); break;
      case Bytecodes::_lload_1        : load_local(longType  , 1); break;
      case Bytecodes::_lload_2        : load_local(longType  , 2); break;
      case Bytecodes::_lload_3        : load_local(longType  , 3); break;
      case Bytecodes::_fload_0        : load_local(floatType , 0); break;
      case Bytecodes::_fload_1        : load_local(floatType , 1); break;
      case Bytecodes::_fload_2        : load_local(floatType , 2); break;
      case Bytecodes::_fload_3        : load_local(floatType , 3); break;
      case Bytecodes::_dload_0        : load_local(doubleType, 0); break;
      case Bytecodes::_dload_1        : load_local(doubleType, 1); break;
      case Bytecodes::_dload_2        : load_local(doubleType, 2); break;
      case Bytecodes::_dload_3        : load_local(doubleType, 3); break;
      case Bytecodes::_aload_0        : load_local(objectType, 0); break;
      case Bytecodes::_aload_1        : load_local(objectType, 1); break;
      case Bytecodes::_aload_2        : load_local(objectType, 2); break;
      case Bytecodes::_aload_3        : load_local(objectType, 3); break;
      case Bytecodes::_iaload         : load_indexed(T_INT   ); break;
      case Bytecodes::_laload         : load_indexed(T_LONG  ); break;
      case Bytecodes::_faload         : load_indexed(T_FLOAT ); break;
      case Bytecodes::_daload         : load_indexed(T_DOUBLE); break;
      case Bytecodes::_aaload         : load_indexed(T_OBJECT); break;
      case Bytecodes::_baload         : load_indexed(T_BYTE  ); break;
      case Bytecodes::_caload         : load_indexed(T_CHAR  ); break;
      case Bytecodes::_saload         : load_indexed(T_SHORT ); break;
      case Bytecodes::_istore         : store_local(intType   , s.get_index()); break;
      case Bytecodes::_lstore         : store_local(longType  , s.get_index()); break;
      case Bytecodes::_fstore         : store_local(floatType , s.get_index()); break;
      case Bytecodes::_dstore         : store_local(doubleType, s.get_index()); break;
      case Bytecodes::_astore         : store_local(objectType, s.get_index()); break;
      case Bytecodes::_istore_0       : store_local(intType   , 0); break;
      case Bytecodes::_istore_1       : store_local(intType   , 1); break;
      case Bytecodes::_istore_2       : store_local(intType   , 2); break;
      case Bytecodes::_istore_3       : store_local(intType   , 3); break;
      case Bytecodes::_lstore_0       : store_local(longType  , 0); break;
      case Bytecodes::_lstore_1       : store_local(longType  , 1); break;
      case Bytecodes::_lstore_2       : store_local(longType  , 2); break;
      case Bytecodes::_lstore_3       : store_local(longType  , 3); break;
      case Bytecodes::_fstore_0       : store_local(floatType , 0); break;
      case Bytecodes::_fstore_1       : store_local(floatType , 1); break;
      case Bytecodes::_fstore_2       : store_local(floatType , 2); break;
      case Bytecodes::_fstore_3       : store_local(floatType , 3); break;
      case Bytecodes::_dstore_0       : store_local(doubleType, 0); break;
      case Bytecodes::_dstore_1       : store_local(doubleType, 1); break;
      case Bytecodes::_dstore_2       : store_local(doubleType, 2); break;
      case Bytecodes::_dstore_3       : store_local(doubleType, 3); break;
      case Bytecodes::_astore_0       : store_local(objectType, 0); break;
      case Bytecodes::_astore_1       : store_local(objectType, 1); break;
      case Bytecodes::_astore_2       : store_local(objectType, 2); break;
      case Bytecodes::_astore_3       : store_local(objectType, 3); break;
      case Bytecodes::_iastore        : store_indexed(T_INT   ); break;
      case Bytecodes::_lastore        : store_indexed(T_LONG  ); break;
      case Bytecodes::_fastore        : store_indexed(T_FLOAT ); break;
      case Bytecodes::_dastore        : store_indexed(T_DOUBLE); break;
      case Bytecodes::_aastore        : store_indexed(T_OBJECT); break;
      case Bytecodes::_bastore        : store_indexed(T_BYTE  ); break;
      case Bytecodes::_castore        : store_indexed(T_CHAR  ); break;
      case Bytecodes::_sastore        : store_indexed(T_SHORT ); break;
      case Bytecodes::_pop            : // fall through
      case Bytecodes::_pop2           : // fall through
      case Bytecodes::_dup            : // fall through
      case Bytecodes::_dup_x1         : // fall through
      case Bytecodes::_dup_x2         : // fall through
      case Bytecodes::_dup2           : // fall through
      case Bytecodes::_dup2_x1        : // fall through
      case Bytecodes::_dup2_x2        : // fall through
      case Bytecodes::_swap           : stack_op(code); break;
      case Bytecodes::_iadd           : arithmetic_op(intType   , code); break;
      case Bytecodes::_ladd           : arithmetic_op(longType  , code); break;
      case Bytecodes::_fadd           : arithmetic_op(floatType , code); break;
      case Bytecodes::_dadd           : arithmetic_op(doubleType, code); break;
      case Bytecodes::_isub           : arithmetic_op(intType   , code); break;
      case Bytecodes::_lsub           : arithmetic_op(longType  , code); break;
      case Bytecodes::_fsub           : arithmetic_op(floatType , code); break;
      case Bytecodes::_dsub           : arithmetic_op(doubleType, code); break;
      case Bytecodes::_imul           : arithmetic_op(intType   , code); break;
      case Bytecodes::_lmul           : arithmetic_op(longType  , code); break;
      case Bytecodes::_fmul           : arithmetic_op(floatType , code); break;
      case Bytecodes::_dmul           : arithmetic_op(doubleType, code); break;
R
roland 已提交
2612 2613
      case Bytecodes::_idiv           : arithmetic_op(intType   , code, copy_state_for_exception()); break;
      case Bytecodes::_ldiv           : arithmetic_op(longType  , code, copy_state_for_exception()); break;
D
duke 已提交
2614 2615
      case Bytecodes::_fdiv           : arithmetic_op(floatType , code); break;
      case Bytecodes::_ddiv           : arithmetic_op(doubleType, code); break;
R
roland 已提交
2616 2617
      case Bytecodes::_irem           : arithmetic_op(intType   , code, copy_state_for_exception()); break;
      case Bytecodes::_lrem           : arithmetic_op(longType  , code, copy_state_for_exception()); break;
D
duke 已提交
2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688
      case Bytecodes::_frem           : arithmetic_op(floatType , code); break;
      case Bytecodes::_drem           : arithmetic_op(doubleType, code); break;
      case Bytecodes::_ineg           : negate_op(intType   ); break;
      case Bytecodes::_lneg           : negate_op(longType  ); break;
      case Bytecodes::_fneg           : negate_op(floatType ); break;
      case Bytecodes::_dneg           : negate_op(doubleType); break;
      case Bytecodes::_ishl           : shift_op(intType , code); break;
      case Bytecodes::_lshl           : shift_op(longType, code); break;
      case Bytecodes::_ishr           : shift_op(intType , code); break;
      case Bytecodes::_lshr           : shift_op(longType, code); break;
      case Bytecodes::_iushr          : shift_op(intType , code); break;
      case Bytecodes::_lushr          : shift_op(longType, code); break;
      case Bytecodes::_iand           : logic_op(intType , code); break;
      case Bytecodes::_land           : logic_op(longType, code); break;
      case Bytecodes::_ior            : logic_op(intType , code); break;
      case Bytecodes::_lor            : logic_op(longType, code); break;
      case Bytecodes::_ixor           : logic_op(intType , code); break;
      case Bytecodes::_lxor           : logic_op(longType, code); break;
      case Bytecodes::_iinc           : increment(); break;
      case Bytecodes::_i2l            : convert(code, T_INT   , T_LONG  ); break;
      case Bytecodes::_i2f            : convert(code, T_INT   , T_FLOAT ); break;
      case Bytecodes::_i2d            : convert(code, T_INT   , T_DOUBLE); break;
      case Bytecodes::_l2i            : convert(code, T_LONG  , T_INT   ); break;
      case Bytecodes::_l2f            : convert(code, T_LONG  , T_FLOAT ); break;
      case Bytecodes::_l2d            : convert(code, T_LONG  , T_DOUBLE); break;
      case Bytecodes::_f2i            : convert(code, T_FLOAT , T_INT   ); break;
      case Bytecodes::_f2l            : convert(code, T_FLOAT , T_LONG  ); break;
      case Bytecodes::_f2d            : convert(code, T_FLOAT , T_DOUBLE); break;
      case Bytecodes::_d2i            : convert(code, T_DOUBLE, T_INT   ); break;
      case Bytecodes::_d2l            : convert(code, T_DOUBLE, T_LONG  ); break;
      case Bytecodes::_d2f            : convert(code, T_DOUBLE, T_FLOAT ); break;
      case Bytecodes::_i2b            : convert(code, T_INT   , T_BYTE  ); break;
      case Bytecodes::_i2c            : convert(code, T_INT   , T_CHAR  ); break;
      case Bytecodes::_i2s            : convert(code, T_INT   , T_SHORT ); break;
      case Bytecodes::_lcmp           : compare_op(longType  , code); break;
      case Bytecodes::_fcmpl          : compare_op(floatType , code); break;
      case Bytecodes::_fcmpg          : compare_op(floatType , code); break;
      case Bytecodes::_dcmpl          : compare_op(doubleType, code); break;
      case Bytecodes::_dcmpg          : compare_op(doubleType, code); break;
      case Bytecodes::_ifeq           : if_zero(intType   , If::eql); break;
      case Bytecodes::_ifne           : if_zero(intType   , If::neq); break;
      case Bytecodes::_iflt           : if_zero(intType   , If::lss); break;
      case Bytecodes::_ifge           : if_zero(intType   , If::geq); break;
      case Bytecodes::_ifgt           : if_zero(intType   , If::gtr); break;
      case Bytecodes::_ifle           : if_zero(intType   , If::leq); break;
      case Bytecodes::_if_icmpeq      : if_same(intType   , If::eql); break;
      case Bytecodes::_if_icmpne      : if_same(intType   , If::neq); break;
      case Bytecodes::_if_icmplt      : if_same(intType   , If::lss); break;
      case Bytecodes::_if_icmpge      : if_same(intType   , If::geq); break;
      case Bytecodes::_if_icmpgt      : if_same(intType   , If::gtr); break;
      case Bytecodes::_if_icmple      : if_same(intType   , If::leq); break;
      case Bytecodes::_if_acmpeq      : if_same(objectType, If::eql); break;
      case Bytecodes::_if_acmpne      : if_same(objectType, If::neq); break;
      case Bytecodes::_goto           : _goto(s.cur_bci(), s.get_dest()); break;
      case Bytecodes::_jsr            : jsr(s.get_dest()); break;
      case Bytecodes::_ret            : ret(s.get_index()); break;
      case Bytecodes::_tableswitch    : table_switch(); break;
      case Bytecodes::_lookupswitch   : lookup_switch(); break;
      case Bytecodes::_ireturn        : method_return(ipop()); break;
      case Bytecodes::_lreturn        : method_return(lpop()); break;
      case Bytecodes::_freturn        : method_return(fpop()); break;
      case Bytecodes::_dreturn        : method_return(dpop()); break;
      case Bytecodes::_areturn        : method_return(apop()); break;
      case Bytecodes::_return         : method_return(NULL  ); break;
      case Bytecodes::_getstatic      : // fall through
      case Bytecodes::_putstatic      : // fall through
      case Bytecodes::_getfield       : // fall through
      case Bytecodes::_putfield       : access_field(code); break;
      case Bytecodes::_invokevirtual  : // fall through
      case Bytecodes::_invokespecial  : // fall through
      case Bytecodes::_invokestatic   : // fall through
2689
      case Bytecodes::_invokedynamic  : // fall through
D
duke 已提交
2690
      case Bytecodes::_invokeinterface: invoke(code); break;
2691
      case Bytecodes::_new            : new_instance(s.get_index_u2()); break;
D
duke 已提交
2692 2693
      case Bytecodes::_newarray       : new_type_array(); break;
      case Bytecodes::_anewarray      : new_object_array(); break;
R
roland 已提交
2694
      case Bytecodes::_arraylength    : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; }
D
duke 已提交
2695
      case Bytecodes::_athrow         : throw_op(s.cur_bci()); break;
2696 2697
      case Bytecodes::_checkcast      : check_cast(s.get_index_u2()); break;
      case Bytecodes::_instanceof     : instance_of(s.get_index_u2()); break;
D
duke 已提交
2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708
      case Bytecodes::_monitorenter   : monitorenter(apop(), s.cur_bci()); break;
      case Bytecodes::_monitorexit    : monitorexit (apop(), s.cur_bci()); break;
      case Bytecodes::_wide           : ShouldNotReachHere(); break;
      case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break;
      case Bytecodes::_ifnull         : if_null(objectType, If::eql); break;
      case Bytecodes::_ifnonnull      : if_null(objectType, If::neq); break;
      case Bytecodes::_goto_w         : _goto(s.cur_bci(), s.get_far_dest()); break;
      case Bytecodes::_jsr_w          : jsr(s.get_far_dest()); break;
      case Bytecodes::_breakpoint     : BAILOUT_("concurrent setting of breakpoint", NULL);
      default                         : ShouldNotReachHere(); break;
    }
V
vlivanov 已提交
2709 2710 2711 2712

    if (log != NULL)
      log->clear_context(); // skip marker if nothing was printed

D
duke 已提交
2713 2714
    // save current bci to setup Goto at the end
    prev_bci = s.cur_bci();
V
vlivanov 已提交
2715

D
duke 已提交
2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728
  }
  CHECK_BAILOUT_(NULL);
  // stop processing of this block (see try_inline_full)
  if (_skip_block) {
    _skip_block = false;
    assert(_last && _last->as_BlockEnd(), "");
    return _last->as_BlockEnd();
  }
  // if there are any, check if last instruction is a BlockEnd instruction
  BlockEnd* end = last()->as_BlockEnd();
  if (end == NULL) {
    // all blocks must end with a BlockEnd instruction => add a Goto
    end = new Goto(block_at(s.cur_bci()), false);
R
roland 已提交
2729
    append(end);
D
duke 已提交
2730 2731 2732
  }
  assert(end == last()->as_BlockEnd(), "inconsistency");

R
roland 已提交
2733 2734
  assert(end->state() != NULL, "state must already be present");
  assert(end->as_Return() == NULL || end->as_Throw() == NULL || end->state()->stack_size() == 0, "stack not needed for return and throw");
D
duke 已提交
2735 2736 2737 2738 2739 2740 2741 2742 2743

  // connect to begin & set state
  // NOTE that inlining may have changed the block we are parsing
  block()->set_end(end);
  // propagate state
  for (int i = end->number_of_sux() - 1; i >= 0; i--) {
    BlockBegin* sux = end->sux_at(i);
    assert(sux->is_predecessor(block()), "predecessor missing");
    // be careful, bailout if bytecodes are strange
R
roland 已提交
2744
    if (!sux->try_merge(end->state())) BAILOUT_("block join failed", NULL);
D
duke 已提交
2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819
    scope_data()->add_to_work_list(end->sux_at(i));
  }

  scope_data()->set_stream(NULL);

  // done
  return end;
}


void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) {
  do {
    if (start_in_current_block_for_inlining && !bailed_out()) {
      iterate_bytecodes_for_block(0);
      start_in_current_block_for_inlining = false;
    } else {
      BlockBegin* b;
      while ((b = scope_data()->remove_from_work_list()) != NULL) {
        if (!b->is_set(BlockBegin::was_visited_flag)) {
          if (b->is_set(BlockBegin::osr_entry_flag)) {
            // we're about to parse the osr entry block, so make sure
            // we setup the OSR edge leading into this block so that
            // Phis get setup correctly.
            setup_osr_entry_block();
            // this is no longer the osr entry block, so clear it.
            b->clear(BlockBegin::osr_entry_flag);
          }
          b->set(BlockBegin::was_visited_flag);
          connect_to_end(b);
        }
      }
    }
  } while (!bailed_out() && !scope_data()->is_work_list_empty());
}


bool GraphBuilder::_can_trap      [Bytecodes::number_of_java_codes];

void GraphBuilder::initialize() {
  // the following bytecodes are assumed to potentially
  // throw exceptions in compiled code - note that e.g.
  // monitorexit & the return bytecodes do not throw
  // exceptions since monitor pairing proved that they
  // succeed (if monitor pairing succeeded)
  Bytecodes::Code can_trap_list[] =
    { Bytecodes::_ldc
    , Bytecodes::_ldc_w
    , Bytecodes::_ldc2_w
    , Bytecodes::_iaload
    , Bytecodes::_laload
    , Bytecodes::_faload
    , Bytecodes::_daload
    , Bytecodes::_aaload
    , Bytecodes::_baload
    , Bytecodes::_caload
    , Bytecodes::_saload
    , Bytecodes::_iastore
    , Bytecodes::_lastore
    , Bytecodes::_fastore
    , Bytecodes::_dastore
    , Bytecodes::_aastore
    , Bytecodes::_bastore
    , Bytecodes::_castore
    , Bytecodes::_sastore
    , Bytecodes::_idiv
    , Bytecodes::_ldiv
    , Bytecodes::_irem
    , Bytecodes::_lrem
    , Bytecodes::_getstatic
    , Bytecodes::_putstatic
    , Bytecodes::_getfield
    , Bytecodes::_putfield
    , Bytecodes::_invokevirtual
    , Bytecodes::_invokespecial
    , Bytecodes::_invokestatic
2820
    , Bytecodes::_invokedynamic
D
duke 已提交
2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855
    , Bytecodes::_invokeinterface
    , Bytecodes::_new
    , Bytecodes::_newarray
    , Bytecodes::_anewarray
    , Bytecodes::_arraylength
    , Bytecodes::_athrow
    , Bytecodes::_checkcast
    , Bytecodes::_instanceof
    , Bytecodes::_monitorenter
    , Bytecodes::_multianewarray
    };

  // inititialize trap tables
  for (int i = 0; i < Bytecodes::number_of_java_codes; i++) {
    _can_trap[i] = false;
  }
  // set standard trap info
  for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) {
    _can_trap[can_trap_list[j]] = true;
  }
}


BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) {
  assert(entry->is_set(f), "entry/flag mismatch");
  // create header block
  BlockBegin* h = new BlockBegin(entry->bci());
  h->set_depth_first_number(0);

  Value l = h;
  BlockEnd* g = new Goto(entry, false);
  l->set_next(g, entry->bci());
  h->set_end(g);
  h->set(f);
  // setup header block end state
R
roland 已提交
2856
  ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis)
D
duke 已提交
2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875
  assert(s->stack_is_empty(), "must have empty stack at entry point");
  g->set_state(s);
  return h;
}



BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) {
  BlockBegin* start = new BlockBegin(0);

  // This code eliminates the empty start block at the beginning of
  // each method.  Previously, each method started with the
  // start-block created below, and this block was followed by the
  // header block that was always empty.  This header block is only
  // necesary if std_entry is also a backward branch target because
  // then phi functions may be necessary in the header block.  It's
  // also necessary when profiling so that there's a single block that
  // can increment the interpreter_invocation_count.
  BlockBegin* new_header_block;
I
iveresov 已提交
2876
  if (std_entry->number_of_preds() > 0 || count_invocations() || count_backedges()) {
D
duke 已提交
2877
    new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state);
I
iveresov 已提交
2878 2879
  } else {
    new_header_block = std_entry;
D
duke 已提交
2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890
  }

  // setup start block (root for the IR graph)
  Base* base =
    new Base(
      new_header_block,
      osr_entry
    );
  start->set_next(base, 0);
  start->set_end(base);
  // create & setup state for start block
R
roland 已提交
2891 2892
  start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
  base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci()));
D
duke 已提交
2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925

  if (base->std_entry()->state() == NULL) {
    // setup states for header blocks
    base->std_entry()->merge(state);
  }

  assert(base->std_entry()->state() != NULL, "");
  return start;
}


void GraphBuilder::setup_osr_entry_block() {
  assert(compilation()->is_osr_compile(), "only for osrs");

  int osr_bci = compilation()->osr_bci();
  ciBytecodeStream s(method());
  s.reset_to_bci(osr_bci);
  s.next();
  scope_data()->set_stream(&s);

  // create a new block to be the osr setup code
  _osr_entry = new BlockBegin(osr_bci);
  _osr_entry->set(BlockBegin::osr_entry_flag);
  _osr_entry->set_depth_first_number(0);
  BlockBegin* target = bci2block()->at(osr_bci);
  assert(target != NULL && target->is_set(BlockBegin::osr_entry_flag), "must be there");
  // the osr entry has no values for locals
  ValueStack* state = target->state()->copy();
  _osr_entry->set_state(state);

  kill_all();
  _block = _osr_entry;
  _state = _osr_entry->state()->copy();
R
roland 已提交
2926
  assert(_state->bci() == osr_bci, "mismatch");
D
duke 已提交
2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965
  _last  = _osr_entry;
  Value e = append(new OsrEntry());
  e->set_needs_null_check(false);

  // OSR buffer is
  //
  // locals[nlocals-1..0]
  // monitors[number_of_locks-1..0]
  //
  // locals is a direct copy of the interpreter frame so in the osr buffer
  // so first slot in the local array is the last local from the interpreter
  // and last slot is local[0] (receiver) from the interpreter
  //
  // Similarly with locks. The first lock slot in the osr buffer is the nth lock
  // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock
  // in the interpreter frame (the method lock if a sync method)

  // Initialize monitors in the compiled activation.

  int index;
  Value local;

  // find all the locals that the interpreter thinks contain live oops
  const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci);

  // compute the offset into the locals so that we can treat the buffer
  // as if the locals were still in the interpreter frame
  int locals_offset = BytesPerWord * (method()->max_locals() - 1);
  for_each_local_value(state, index, local) {
    int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord;
    Value get;
    if (local->type()->is_object_kind() && !live_oops.at(index)) {
      // The interpreter thinks this local is dead but the compiler
      // doesn't so pretend that the interpreter passed in null.
      get = append(new Constant(objectNull));
    } else {
      get = append(new UnsafeGetRaw(as_BasicType(local->type()), e,
                                    append(new Constant(new IntConstant(offset))),
                                    0,
2966
                                    true /*unaligned*/, true /*wide*/));
D
duke 已提交
2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984
    }
    _state->store_local(index, get);
  }

  // the storage for the OSR buffer is freed manually in the LIRGenerator.

  assert(state->caller_state() == NULL, "should be top scope");
  state->clear_locals();
  Goto* g = new Goto(target, false);
  append(g);
  _osr_entry->set_end(g);
  target->merge(_osr_entry->end()->state());

  scope_data()->set_stream(NULL);
}


ValueStack* GraphBuilder::state_at_entry() {
R
roland 已提交
2985
  ValueStack* state = new ValueStack(scope(), NULL);
D
duke 已提交
2986 2987 2988 2989 2990

  // Set up locals for receiver
  int idx = 0;
  if (!method()->is_static()) {
    // we should always see the receiver
2991
    state->store_local(idx, new Local(method()->holder(), objectType, idx));
D
duke 已提交
2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002
    idx = 1;
  }

  // Set up locals for incoming arguments
  ciSignature* sig = method()->signature();
  for (int i = 0; i < sig->count(); i++) {
    ciType* type = sig->type_at(i);
    BasicType basic_type = type->basic_type();
    // don't allow T_ARRAY to propagate into locals types
    if (basic_type == T_ARRAY) basic_type = T_OBJECT;
    ValueType* vt = as_ValueType(basic_type);
3003
    state->store_local(idx, new Local(type, vt, idx));
D
duke 已提交
3004 3005 3006 3007 3008
    idx += type->size();
  }

  // lock synchronized method
  if (method()->is_synchronized()) {
R
roland 已提交
3009
    state->lock(NULL);
D
duke 已提交
3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048
  }

  return state;
}


GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope)
  : _scope_data(NULL)
  , _instruction_count(0)
  , _osr_entry(NULL)
  , _memory(new MemoryBuffer())
  , _compilation(compilation)
  , _inline_bailout_msg(NULL)
{
  int osr_bci = compilation->osr_bci();

  // determine entry points and bci2block mapping
  BlockListBuilder blm(compilation, scope, osr_bci);
  CHECK_BAILOUT();

  BlockList* bci2block = blm.bci2block();
  BlockBegin* start_block = bci2block->at(0);

  push_root_scope(scope, bci2block, start_block);

  // setup state for std entry
  _initial_state = state_at_entry();
  start_block->merge(_initial_state);

  // complete graph
  _vmap        = new ValueMap();
  switch (scope->method()->intrinsic_id()) {
  case vmIntrinsics::_dabs          : // fall through
  case vmIntrinsics::_dsqrt         : // fall through
  case vmIntrinsics::_dsin          : // fall through
  case vmIntrinsics::_dcos          : // fall through
  case vmIntrinsics::_dtan          : // fall through
  case vmIntrinsics::_dlog          : // fall through
  case vmIntrinsics::_dlog10        : // fall through
3049 3050
  case vmIntrinsics::_dexp          : // fall through
  case vmIntrinsics::_dpow          : // fall through
D
duke 已提交
3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067
    {
      // Compiles where the root method is an intrinsic need a special
      // compilation environment because the bytecodes for the method
      // shouldn't be parsed during the compilation, only the special
      // Intrinsic node should be emitted.  If this isn't done the the
      // code for the inlined version will be different than the root
      // compiled version which could lead to monotonicity problems on
      // intel.

      // Set up a stream so that appending instructions works properly.
      ciBytecodeStream s(scope->method());
      s.reset_to_bci(0);
      scope_data()->set_stream(&s);
      s.next();

      // setup the initial block state
      _block = start_block;
R
roland 已提交
3068
      _state = start_block->state()->copy_for_parsing();
D
duke 已提交
3069 3070
      _last  = start_block;
      load_local(doubleType, 0);
3071 3072 3073
      if (scope->method()->intrinsic_id() == vmIntrinsics::_dpow) {
        load_local(doubleType, 2);
      }
D
duke 已提交
3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084

      // Emit the intrinsic node.
      bool result = try_inline_intrinsics(scope->method());
      if (!result) BAILOUT("failed to inline intrinsic");
      method_return(dpop());

      // connect the begin and end blocks and we're all done.
      BlockEnd* end = last()->as_BlockEnd();
      block()->set_end(end);
      break;
    }
3085 3086 3087

  case vmIntrinsics::_Reference_get:
    {
3088
      {
3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099
        // With java.lang.ref.reference.get() we must go through the
        // intrinsic - when G1 is enabled - even when get() is the root
        // method of the compile so that, if necessary, the value in
        // the referent field of the reference object gets recorded by
        // the pre-barrier code.
        // Specifically, if G1 is enabled, the value in the referent
        // field is recorded by the G1 SATB pre barrier. This will
        // result in the referent being marked live and the reference
        // object removed from the list of discovered references during
        // reference processing.

3100 3101 3102
        // Also we need intrinsic to prevent commoning reads from this field
        // across safepoint since GC can change its value.

3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127
        // Set up a stream so that appending instructions works properly.
        ciBytecodeStream s(scope->method());
        s.reset_to_bci(0);
        scope_data()->set_stream(&s);
        s.next();

        // setup the initial block state
        _block = start_block;
        _state = start_block->state()->copy_for_parsing();
        _last  = start_block;
        load_local(objectType, 0);

        // Emit the intrinsic node.
        bool result = try_inline_intrinsics(scope->method());
        if (!result) BAILOUT("failed to inline intrinsic");
        method_return(apop());

        // connect the begin and end blocks and we're all done.
        BlockEnd* end = last()->as_BlockEnd();
        block()->set_end(end);
        break;
      }
      // Otherwise, fall thru
    }

D
duke 已提交
3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155
  default:
    scope_data()->add_to_work_list(start_block);
    iterate_all_blocks();
    break;
  }
  CHECK_BAILOUT();

  _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state);

  eliminate_redundant_phis(_start);

  NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats());
  // for osr compile, bailout if some requirements are not fulfilled
  if (osr_bci != -1) {
    BlockBegin* osr_block = blm.bci2block()->at(osr_bci);
    assert(osr_block->is_set(BlockBegin::was_visited_flag),"osr entry must have been visited for osr compile");

    // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points
    if (!osr_block->state()->stack_is_empty()) {
      BAILOUT("stack not empty at OSR entry point");
    }
  }
#ifndef PRODUCT
  if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count);
#endif
}


R
roland 已提交
3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169
ValueStack* GraphBuilder::copy_state_before() {
  return copy_state_before_with_bci(bci());
}

ValueStack* GraphBuilder::copy_state_exhandling() {
  return copy_state_exhandling_with_bci(bci());
}

ValueStack* GraphBuilder::copy_state_for_exception() {
  return copy_state_for_exception_with_bci(bci());
}

ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) {
  return state()->copy(ValueStack::StateBefore, bci);
D
duke 已提交
3170 3171
}

R
roland 已提交
3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187
ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) {
  if (!has_handler()) return NULL;
  return state()->copy(ValueStack::StateBefore, bci);
}

ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) {
  ValueStack* s = copy_state_exhandling_with_bci(bci);
  if (s == NULL) {
    if (_compilation->env()->jvmti_can_access_local_variables()) {
      s = state()->copy(ValueStack::ExceptionState, bci);
    } else {
      s = state()->copy(ValueStack::EmptyExceptionState, bci);
    }
  }
  return s;
}
D
duke 已提交
3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199

int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const {
  int recur_level = 0;
  for (IRScope* s = scope(); s != NULL; s = s->caller()) {
    if (s->method() == cur_callee) {
      ++recur_level;
    }
  }
  return recur_level;
}


3200 3201 3202 3203
bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known, Bytecodes::Code bc, Value receiver) {
  const char* msg = NULL;

  // clear out any existing inline bailout condition
D
duke 已提交
3204 3205
  clear_inline_bailout();

3206 3207 3208 3209 3210 3211 3212
  // exclude methods we don't want to inline
  msg = should_not_inline(callee);
  if (msg != NULL) {
    print_inlining(callee, msg, /*success*/ false);
    return false;
  }

3213 3214 3215 3216 3217
  // method handle invokes
  if (callee->is_method_handle_intrinsic()) {
    return try_method_handle_inline(callee);
  }

3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231
  // handle intrinsics
  if (callee->intrinsic_id() != vmIntrinsics::_none) {
    if (try_inline_intrinsics(callee)) {
      print_inlining(callee, "intrinsic");
      return true;
    }
    // try normal inlining
  }

  // certain methods cannot be parsed at all
  msg = check_can_parse(callee);
  if (msg != NULL) {
    print_inlining(callee, msg, /*success*/ false);
    return false;
D
duke 已提交
3232
  }
3233 3234 3235 3236 3237 3238 3239

  // If bytecode not set use the current one.
  if (bc == Bytecodes::_illegal) {
    bc = code();
  }
  if (try_inline_full(callee, holder_known, bc, receiver))
    return true;
3240 3241 3242 3243 3244 3245

  // Entire compilation could fail during try_inline_full call.
  // In that case printing inlining decision info is useless.
  if (!bailed_out())
    print_inlining(callee, _inline_bailout_msg, /*success*/ false);

3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264
  return false;
}


const char* GraphBuilder::check_can_parse(ciMethod* callee) const {
  // Certain methods cannot be parsed at all:
  if ( callee->is_native())            return "native method";
  if ( callee->is_abstract())          return "abstract method";
  if (!callee->can_be_compiled())      return "not compilable (disabled)";
  return NULL;
}


// negative filter: should callee NOT be inlined?  returns NULL, ok to inline, or rejection msg
const char* GraphBuilder::should_not_inline(ciMethod* callee) const {
  if ( callee->should_exclude())       return "excluded by CompilerOracle";
  if ( callee->should_not_inline())    return "disallowed by CompilerOracle";
  if ( callee->dont_inline())          return "don't inline by annotation";
  return NULL;
D
duke 已提交
3265 3266 3267 3268
}


bool GraphBuilder::try_inline_intrinsics(ciMethod* callee) {
3269 3270 3271 3272 3273
  if (callee->is_synchronized()) {
    // We don't currently support any synchronized intrinsics
    return false;
  }

D
duke 已提交
3274 3275
  // callee seems like a good candidate
  // determine id
3276 3277 3278 3279 3280
  vmIntrinsics::ID id = callee->intrinsic_id();
  if (!InlineNatives && id != vmIntrinsics::_Reference_get) {
    // InlineNatives does not control Reference.get
    INLINE_BAILOUT("intrinsic method inlining disabled");
  }
D
duke 已提交
3281 3282 3283
  bool preserves_state = false;
  bool cantrap = true;
  switch (id) {
3284
    case vmIntrinsics::_arraycopy:
D
duke 已提交
3285 3286 3287
      if (!InlineArrayCopy) return false;
      break;

3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300
#ifdef TRACE_HAVE_INTRINSICS
    case vmIntrinsics::_classID:
    case vmIntrinsics::_threadID:
      preserves_state = true;
      cantrap = true;
      break;

    case vmIntrinsics::_counterTime:
      preserves_state = true;
      cantrap = false;
      break;
#endif

D
duke 已提交
3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316
    case vmIntrinsics::_currentTimeMillis:
    case vmIntrinsics::_nanoTime:
      preserves_state = true;
      cantrap = false;
      break;

    case vmIntrinsics::_floatToRawIntBits   :
    case vmIntrinsics::_intBitsToFloat      :
    case vmIntrinsics::_doubleToRawLongBits :
    case vmIntrinsics::_longBitsToDouble    :
      if (!InlineMathNatives) return false;
      preserves_state = true;
      cantrap = false;
      break;

    case vmIntrinsics::_getClass      :
3317
    case vmIntrinsics::_isInstance    :
D
duke 已提交
3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332 3333 3334
      if (!InlineClassNatives) return false;
      preserves_state = true;
      break;

    case vmIntrinsics::_currentThread :
      if (!InlineThreadNatives) return false;
      preserves_state = true;
      cantrap = false;
      break;

    case vmIntrinsics::_dabs          : // fall through
    case vmIntrinsics::_dsqrt         : // fall through
    case vmIntrinsics::_dsin          : // fall through
    case vmIntrinsics::_dcos          : // fall through
    case vmIntrinsics::_dtan          : // fall through
    case vmIntrinsics::_dlog          : // fall through
    case vmIntrinsics::_dlog10        : // fall through
3335 3336
    case vmIntrinsics::_dexp          : // fall through
    case vmIntrinsics::_dpow          : // fall through
D
duke 已提交
3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420
      if (!InlineMathNatives) return false;
      cantrap = false;
      preserves_state = true;
      break;

    // Use special nodes for Unsafe instructions so we can more easily
    // perform an address-mode optimization on the raw variants
    case vmIntrinsics::_getObject : return append_unsafe_get_obj(callee, T_OBJECT,  false);
    case vmIntrinsics::_getBoolean: return append_unsafe_get_obj(callee, T_BOOLEAN, false);
    case vmIntrinsics::_getByte   : return append_unsafe_get_obj(callee, T_BYTE,    false);
    case vmIntrinsics::_getShort  : return append_unsafe_get_obj(callee, T_SHORT,   false);
    case vmIntrinsics::_getChar   : return append_unsafe_get_obj(callee, T_CHAR,    false);
    case vmIntrinsics::_getInt    : return append_unsafe_get_obj(callee, T_INT,     false);
    case vmIntrinsics::_getLong   : return append_unsafe_get_obj(callee, T_LONG,    false);
    case vmIntrinsics::_getFloat  : return append_unsafe_get_obj(callee, T_FLOAT,   false);
    case vmIntrinsics::_getDouble : return append_unsafe_get_obj(callee, T_DOUBLE,  false);

    case vmIntrinsics::_putObject : return append_unsafe_put_obj(callee, T_OBJECT,  false);
    case vmIntrinsics::_putBoolean: return append_unsafe_put_obj(callee, T_BOOLEAN, false);
    case vmIntrinsics::_putByte   : return append_unsafe_put_obj(callee, T_BYTE,    false);
    case vmIntrinsics::_putShort  : return append_unsafe_put_obj(callee, T_SHORT,   false);
    case vmIntrinsics::_putChar   : return append_unsafe_put_obj(callee, T_CHAR,    false);
    case vmIntrinsics::_putInt    : return append_unsafe_put_obj(callee, T_INT,     false);
    case vmIntrinsics::_putLong   : return append_unsafe_put_obj(callee, T_LONG,    false);
    case vmIntrinsics::_putFloat  : return append_unsafe_put_obj(callee, T_FLOAT,   false);
    case vmIntrinsics::_putDouble : return append_unsafe_put_obj(callee, T_DOUBLE,  false);

    case vmIntrinsics::_getObjectVolatile : return append_unsafe_get_obj(callee, T_OBJECT,  true);
    case vmIntrinsics::_getBooleanVolatile: return append_unsafe_get_obj(callee, T_BOOLEAN, true);
    case vmIntrinsics::_getByteVolatile   : return append_unsafe_get_obj(callee, T_BYTE,    true);
    case vmIntrinsics::_getShortVolatile  : return append_unsafe_get_obj(callee, T_SHORT,   true);
    case vmIntrinsics::_getCharVolatile   : return append_unsafe_get_obj(callee, T_CHAR,    true);
    case vmIntrinsics::_getIntVolatile    : return append_unsafe_get_obj(callee, T_INT,     true);
    case vmIntrinsics::_getLongVolatile   : return append_unsafe_get_obj(callee, T_LONG,    true);
    case vmIntrinsics::_getFloatVolatile  : return append_unsafe_get_obj(callee, T_FLOAT,   true);
    case vmIntrinsics::_getDoubleVolatile : return append_unsafe_get_obj(callee, T_DOUBLE,  true);

    case vmIntrinsics::_putObjectVolatile : return append_unsafe_put_obj(callee, T_OBJECT,  true);
    case vmIntrinsics::_putBooleanVolatile: return append_unsafe_put_obj(callee, T_BOOLEAN, true);
    case vmIntrinsics::_putByteVolatile   : return append_unsafe_put_obj(callee, T_BYTE,    true);
    case vmIntrinsics::_putShortVolatile  : return append_unsafe_put_obj(callee, T_SHORT,   true);
    case vmIntrinsics::_putCharVolatile   : return append_unsafe_put_obj(callee, T_CHAR,    true);
    case vmIntrinsics::_putIntVolatile    : return append_unsafe_put_obj(callee, T_INT,     true);
    case vmIntrinsics::_putLongVolatile   : return append_unsafe_put_obj(callee, T_LONG,    true);
    case vmIntrinsics::_putFloatVolatile  : return append_unsafe_put_obj(callee, T_FLOAT,   true);
    case vmIntrinsics::_putDoubleVolatile : return append_unsafe_put_obj(callee, T_DOUBLE,  true);

    case vmIntrinsics::_getByte_raw   : return append_unsafe_get_raw(callee, T_BYTE);
    case vmIntrinsics::_getShort_raw  : return append_unsafe_get_raw(callee, T_SHORT);
    case vmIntrinsics::_getChar_raw   : return append_unsafe_get_raw(callee, T_CHAR);
    case vmIntrinsics::_getInt_raw    : return append_unsafe_get_raw(callee, T_INT);
    case vmIntrinsics::_getLong_raw   : return append_unsafe_get_raw(callee, T_LONG);
    case vmIntrinsics::_getFloat_raw  : return append_unsafe_get_raw(callee, T_FLOAT);
    case vmIntrinsics::_getDouble_raw : return append_unsafe_get_raw(callee, T_DOUBLE);

    case vmIntrinsics::_putByte_raw   : return append_unsafe_put_raw(callee, T_BYTE);
    case vmIntrinsics::_putShort_raw  : return append_unsafe_put_raw(callee, T_SHORT);
    case vmIntrinsics::_putChar_raw   : return append_unsafe_put_raw(callee, T_CHAR);
    case vmIntrinsics::_putInt_raw    : return append_unsafe_put_raw(callee, T_INT);
    case vmIntrinsics::_putLong_raw   : return append_unsafe_put_raw(callee, T_LONG);
    case vmIntrinsics::_putFloat_raw  : return append_unsafe_put_raw(callee, T_FLOAT);
    case vmIntrinsics::_putDouble_raw : return append_unsafe_put_raw(callee, T_DOUBLE);

    case vmIntrinsics::_prefetchRead        : return append_unsafe_prefetch(callee, false, false);
    case vmIntrinsics::_prefetchWrite       : return append_unsafe_prefetch(callee, false, true);
    case vmIntrinsics::_prefetchReadStatic  : return append_unsafe_prefetch(callee, true,  false);
    case vmIntrinsics::_prefetchWriteStatic : return append_unsafe_prefetch(callee, true,  true);

    case vmIntrinsics::_checkIndex    :
      if (!InlineNIOCheckIndex) return false;
      preserves_state = true;
      break;
    case vmIntrinsics::_putOrderedObject : return append_unsafe_put_obj(callee, T_OBJECT,  true);
    case vmIntrinsics::_putOrderedInt    : return append_unsafe_put_obj(callee, T_INT,     true);
    case vmIntrinsics::_putOrderedLong   : return append_unsafe_put_obj(callee, T_LONG,    true);

    case vmIntrinsics::_compareAndSwapLong:
      if (!VM_Version::supports_cx8()) return false;
      // fall through
    case vmIntrinsics::_compareAndSwapInt:
    case vmIntrinsics::_compareAndSwapObject:
      append_unsafe_CAS(callee);
      return true;

3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455
    case vmIntrinsics::_getAndAddInt:
      if (!VM_Version::supports_atomic_getadd4()) {
        return false;
      }
      return append_unsafe_get_and_set_obj(callee, true);
    case vmIntrinsics::_getAndAddLong:
      if (!VM_Version::supports_atomic_getadd8()) {
        return false;
      }
      return append_unsafe_get_and_set_obj(callee, true);
    case vmIntrinsics::_getAndSetInt:
      if (!VM_Version::supports_atomic_getset4()) {
        return false;
      }
      return append_unsafe_get_and_set_obj(callee, false);
    case vmIntrinsics::_getAndSetLong:
      if (!VM_Version::supports_atomic_getset8()) {
        return false;
      }
      return append_unsafe_get_and_set_obj(callee, false);
    case vmIntrinsics::_getAndSetObject:
#ifdef _LP64
      if (!UseCompressedOops && !VM_Version::supports_atomic_getset8()) {
        return false;
      }
      if (UseCompressedOops && !VM_Version::supports_atomic_getset4()) {
        return false;
      }
#else
      if (!VM_Version::supports_atomic_getset4()) {
        return false;
      }
#endif
      return append_unsafe_get_and_set_obj(callee, false);

3456
    case vmIntrinsics::_Reference_get:
3457 3458 3459 3460
      // Use the intrinsic version of Reference.get() so that the value in
      // the referent field can be registered by the G1 pre-barrier code.
      // Also to prevent commoning reads from this field across safepoint
      // since GC can change its value.
3461 3462 3463
      preserves_state = true;
      break;

3464 3465 3466 3467 3468 3469 3470 3471
    case vmIntrinsics::_updateCRC32:
    case vmIntrinsics::_updateBytesCRC32:
    case vmIntrinsics::_updateByteBufferCRC32:
      if (!UseCRC32Intrinsics) return false;
      cantrap = false;
      preserves_state = true;
      break;

3472 3473 3474 3475 3476
    case vmIntrinsics::_loadFence :
    case vmIntrinsics::_storeFence:
    case vmIntrinsics::_fullFence :
      break;

D
duke 已提交
3477 3478 3479 3480 3481
    default                       : return false; // do not inline
  }
  // create intrinsic node
  const bool has_receiver = !callee->is_static();
  ValueType* result_type = as_ValueType(callee->return_type());
R
roland 已提交
3482
  ValueStack* state_before = copy_state_for_exception();
D
duke 已提交
3483 3484

  Values* args = state()->pop_arguments(callee->arg_size());
I
iveresov 已提交
3485 3486

  if (is_profiling()) {
D
duke 已提交
3487 3488 3489
    // Don't profile in the special case where the root method
    // is the intrinsic
    if (callee != method()) {
I
iveresov 已提交
3490 3491 3492 3493 3494 3495 3496 3497
      // Note that we'd collect profile data in this method if we wanted it.
      compilation()->set_would_profile(true);
      if (profile_calls()) {
        Value recv = NULL;
        if (has_receiver) {
          recv = args->at(0);
          null_check(recv);
        }
3498
        profile_call(callee, recv, NULL);
D
duke 已提交
3499 3500 3501 3502
      }
    }
  }

R
roland 已提交
3503
  Intrinsic* result = new Intrinsic(result_type, id, args, has_receiver, state_before,
D
duke 已提交
3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535
                                    preserves_state, cantrap);
  // append instruction & push result
  Value value = append_split(result);
  if (result_type != voidType) push(result_type, value);

  // done
  return true;
}


bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) {
  // Introduce a new callee continuation point - all Ret instructions
  // will be replaced with Gotos to this point.
  BlockBegin* cont = block_at(next_bci());
  assert(cont != NULL, "continuation must exist (BlockListBuilder starts a new block after a jsr");

  // Note: can not assign state to continuation yet, as we have to
  // pick up the state from the Ret instructions.

  // Push callee scope
  push_scope_for_jsr(cont, jsr_dest_bci);

  // Temporarily set up bytecode stream so we can append instructions
  // (only using the bci of this stream)
  scope_data()->set_stream(scope_data()->parent()->stream());

  BlockBegin* jsr_start_block = block_at(jsr_dest_bci);
  assert(jsr_start_block != NULL, "jsr start block must exist");
  assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet");
  Goto* goto_sub = new Goto(jsr_start_block, false);
  // Must copy state to avoid wrong sharing when parsing bytecodes
  assert(jsr_start_block->state() == NULL, "should have fresh jsr starting block");
R
roland 已提交
3536
  jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci));
D
duke 已提交
3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624
  append(goto_sub);
  _block->set_end(goto_sub);
  _last = _block = jsr_start_block;

  // Clear out bytecode stream
  scope_data()->set_stream(NULL);

  scope_data()->add_to_work_list(jsr_start_block);

  // Ready to resume parsing in subroutine
  iterate_all_blocks();

  // If we bailed out during parsing, return immediately (this is bad news)
  CHECK_BAILOUT_(false);

  // Detect whether the continuation can actually be reached. If not,
  // it has not had state set by the join() operations in
  // iterate_bytecodes_for_block()/ret() and we should not touch the
  // iteration state. The calling activation of
  // iterate_bytecodes_for_block will then complete normally.
  if (cont->state() != NULL) {
    if (!cont->is_set(BlockBegin::was_visited_flag)) {
      // add continuation to work list instead of parsing it immediately
      scope_data()->parent()->add_to_work_list(cont);
    }
  }

  assert(jsr_continuation() == cont, "continuation must not have changed");
  assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) ||
         jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag),
         "continuation can only be visited in case of backward branches");
  assert(_last && _last->as_BlockEnd(), "block must have end");

  // continuation is in work list, so end iteration of current block
  _skip_block = true;
  pop_scope_for_jsr();

  return true;
}


// Inline the entry of a synchronized method as a monitor enter and
// register the exception handler which releases the monitor if an
// exception is thrown within the callee. Note that the monitor enter
// cannot throw an exception itself, because the receiver is
// guaranteed to be non-null by the explicit null check at the
// beginning of inlining.
void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) {
  assert(lock != NULL && sync_handler != NULL, "lock or handler missing");

  monitorenter(lock, SynchronizationEntryBCI);
  assert(_last->as_MonitorEnter() != NULL, "monitor enter expected");
  _last->set_needs_null_check(false);

  sync_handler->set(BlockBegin::exception_entry_flag);
  sync_handler->set(BlockBegin::is_on_work_list_flag);

  ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0);
  XHandler* h = new XHandler(desc);
  h->set_entry_block(sync_handler);
  scope_data()->xhandlers()->append(h);
  scope_data()->set_has_handler();
}


// If an exception is thrown and not handled within an inlined
// synchronized method, the monitor must be released before the
// exception is rethrown in the outer scope. Generate the appropriate
// instructions here.
void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) {
  BlockBegin* orig_block = _block;
  ValueStack* orig_state = _state;
  Instruction* orig_last = _last;
  _last = _block = sync_handler;
  _state = sync_handler->state()->copy();

  assert(sync_handler != NULL, "handler missing");
  assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here");

  assert(lock != NULL || default_handler, "lock or handler missing");

  XHandler* h = scope_data()->xhandlers()->remove_last();
  assert(h->entry_block() == sync_handler, "corrupt list of handlers");

  block()->set(BlockBegin::was_visited_flag);
  Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI);
  assert(exception->is_pinned(), "must be");

3625
  int bci = SynchronizationEntryBCI;
3626
  if (compilation()->env()->dtrace_method_probes()) {
3627 3628
    // Report exit from inline methods.  We don't have a stream here
    // so pass an explicit bci of SynchronizationEntryBCI.
3629
    Values* args = new Values(1);
3630
    args->push(append_with_bci(new Constant(new MethodConstant(method())), bci));
3631
    append_with_bci(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args), bci);
3632 3633
  }

D
duke 已提交
3634 3635
  if (lock) {
    assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing");
R
roland 已提交
3636
    if (!lock->is_linked()) {
3637
      lock = append_with_bci(lock, bci);
D
duke 已提交
3638 3639 3640
    }

    // exit the monitor in the context of the synchronized method
3641
    monitorexit(lock, bci);
D
duke 已提交
3642 3643 3644 3645

    // exit the context of the synchronized method
    if (!default_handler) {
      pop_scope();
R
roland 已提交
3646 3647
      bci = _state->caller_state()->bci();
      _state = _state->caller_state()->copy_for_parsing();
D
duke 已提交
3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663
    }
  }

  // perform the throw as if at the the call site
  apush(exception);
  throw_op(bci);

  BlockEnd* end = last()->as_BlockEnd();
  block()->set_end(end);

  _block = orig_block;
  _state = orig_state;
  _last = orig_last;
}


3664
bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known, Bytecodes::Code bc, Value receiver) {
D
duke 已提交
3665
  assert(!callee->is_native(), "callee must not be native");
3666 3667
  if (CompilationPolicy::policy()->should_not_inline(compilation()->env(), callee)) {
    INLINE_BAILOUT("inlining prohibited by policy");
I
iveresov 已提交
3668
  }
D
duke 已提交
3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686
  // first perform tests of things it's not possible to inline
  if (callee->has_exception_handlers() &&
      !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers");
  if (callee->is_synchronized() &&
      !InlineSynchronizedMethods         ) INLINE_BAILOUT("callee is synchronized");
  if (!callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet");
  if (!callee->has_balanced_monitors())    INLINE_BAILOUT("callee's monitors do not match");

  // Proper inlining of methods with jsrs requires a little more work.
  if (callee->has_jsrs()                 ) INLINE_BAILOUT("jsrs not handled properly by inliner yet");

  // When SSE2 is used on intel, then no special handling is needed
  // for strictfp because the enum-constant is fixed at compile time,
  // the check for UseSSE2 is needed here
  if (strict_fp_requires_explicit_rounding && UseSSE < 2 && method()->is_strict() != callee->is_strict()) {
    INLINE_BAILOUT("caller and callee have different strict fp requirements");
  }

3687 3688 3689
  if (is_profiling() && !callee->ensure_method_data()) {
    INLINE_BAILOUT("mdo allocation failed");
  }
3690 3691

  // now perform tests that are based on flag settings
3692 3693 3694 3695
  if (callee->force_inline()) {
    print_inlining(callee, "force inline by annotation");
  } else if (callee->should_inline()) {
    print_inlining(callee, "force inline by CompileOracle");
3696
  } else {
3697
    // use heuristic controls on inlining
3698 3699
    if (inline_level() > MaxInlineLevel                         ) INLINE_BAILOUT("inlining too deep");
    if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep");
3700
    if (callee->code_size_for_inlining() > max_inline_size()    ) INLINE_BAILOUT("callee is too large");
3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717

    // don't inline throwable methods unless the inlining tree is rooted in a throwable class
    if (callee->name() == ciSymbol::object_initializer_name() &&
        callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
      // Throwable constructor call
      IRScope* top = scope();
      while (top->caller() != NULL) {
        top = top->caller();
      }
      if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) {
        INLINE_BAILOUT("don't inline Throwable constructors");
      }
    }

    if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) {
      INLINE_BAILOUT("total inlining greater than DesiredMethodLimit");
    }
3718
    // printing
V
vlivanov 已提交
3719
    print_inlining(callee);
3720 3721
  }

D
duke 已提交
3722 3723 3724 3725 3726 3727
  // NOTE: Bailouts from this point on, which occur at the
  // GraphBuilder level, do not cause bailout just of the inlining but
  // in fact of the entire compilation.

  BlockBegin* orig_block = block();

3728 3729 3730
  const bool is_invokedynamic = bc == Bytecodes::_invokedynamic;
  const bool has_receiver = (bc != Bytecodes::_invokestatic && !is_invokedynamic);

D
duke 已提交
3731 3732 3733 3734 3735
  const int args_base = state()->stack_size() - callee->arg_size();
  assert(args_base >= 0, "stack underflow during inlining");

  // Insert null check if necessary
  Value recv = NULL;
3736
  if (has_receiver) {
D
duke 已提交
3737 3738 3739 3740 3741 3742 3743 3744 3745
    // note: null check must happen even if first instruction of callee does
    //       an implicit null check since the callee is in a different scope
    //       and we must make sure exception handling does the right thing
    assert(!callee->is_static(), "callee must not be static");
    assert(callee->arg_size() > 0, "must have at least a receiver");
    recv = state()->stack_at(args_base);
    null_check(recv);
  }

I
iveresov 已提交
3746 3747 3748 3749
  if (is_profiling()) {
    // Note that we'd collect profile data in this method if we wanted it.
    // this may be redundant here...
    compilation()->set_would_profile(true);
D
duke 已提交
3750

I
iveresov 已提交
3751
    if (profile_calls()) {
3752
      profile_call(callee, recv, holder_known ? callee->holder() : NULL);
I
iveresov 已提交
3753 3754
    }
  }
D
duke 已提交
3755 3756 3757 3758 3759 3760

  // Introduce a new callee continuation point - if the callee has
  // more than one return instruction or the return does not allow
  // fall-through of control flow, all return instructions of the
  // callee will need to be replaced by Goto's pointing to this
  // continuation point.
3761
  BlockBegin* cont = block_at(next_bci());
D
duke 已提交
3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783
  bool continuation_existed = true;
  if (cont == NULL) {
    cont = new BlockBegin(next_bci());
    // low number so that continuation gets parsed as early as possible
    cont->set_depth_first_number(0);
#ifndef PRODUCT
    if (PrintInitialBlockList) {
      tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d",
                    cont->block_id(), cont->bci(), bci());
    }
#endif
    continuation_existed = false;
  }
  // Record number of predecessors of continuation block before
  // inlining, to detect if inlined method has edges to its
  // continuation after inlining.
  int continuation_preds = cont->number_of_preds();

  // Push callee scope
  push_scope(callee, cont);

  // the BlockListBuilder for the callee could have bailed out
3784 3785
  if (bailed_out())
      return false;
D
duke 已提交
3786 3787 3788 3789 3790 3791 3792 3793

  // Temporarily set up bytecode stream so we can append instructions
  // (only using the bci of this stream)
  scope_data()->set_stream(scope_data()->parent()->stream());

  // Pass parameters into callee state: add assignments
  // note: this will also ensure that all arguments are computed before being passed
  ValueStack* callee_state = state();
R
roland 已提交
3794
  ValueStack* caller_state = state()->caller_state();
3795 3796 3797 3798
  for (int i = args_base; i < caller_state->stack_size(); ) {
    const int arg_no = i - args_base;
    Value arg = caller_state->stack_at_inc(i);
    store_local(callee_state, arg, arg_no);
D
duke 已提交
3799 3800 3801 3802 3803 3804
  }

  // Remove args from stack.
  // Note that we preserve locals state in case we can use it later
  // (see use of pop_scope() below)
  caller_state->truncate_stack(args_base);
R
roland 已提交
3805
  assert(callee_state->stack_size() == 0, "callee stack must be empty");
D
duke 已提交
3806 3807 3808 3809 3810 3811 3812 3813

  Value lock;
  BlockBegin* sync_handler;

  // Inline the locking of the receiver if the callee is synchronized
  if (callee->is_synchronized()) {
    lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror())))
                               : state()->local_at(0);
R
roland 已提交
3814
    sync_handler = new BlockBegin(SynchronizationEntryBCI);
D
duke 已提交
3815 3816 3817
    inline_sync_entry(lock, sync_handler);
  }

3818 3819
  if (compilation()->env()->dtrace_method_probes()) {
    Values* args = new Values(1);
3820
    args->push(append(new Constant(new MethodConstant(method()))));
3821 3822
    append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args));
  }
D
duke 已提交
3823

3824 3825 3826 3827
  if (profile_inlined_calls()) {
    profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI));
  }

D
duke 已提交
3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850
  BlockBegin* callee_start_block = block_at(0);
  if (callee_start_block != NULL) {
    assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header");
    Goto* goto_callee = new Goto(callee_start_block, false);
    // The state for this goto is in the scope of the callee, so use
    // the entry bci for the callee instead of the call site bci.
    append_with_bci(goto_callee, 0);
    _block->set_end(goto_callee);
    callee_start_block->merge(callee_state);

    _last = _block = callee_start_block;

    scope_data()->add_to_work_list(callee_start_block);
  }

  // Clear out bytecode stream
  scope_data()->set_stream(NULL);

  // Ready to resume parsing in callee (either in the same block we
  // were in before or in the callee's start block)
  iterate_all_blocks(callee_start_block == NULL);

  // If we bailed out during parsing, return immediately (this is bad news)
3851 3852
  if (bailed_out())
      return false;
D
duke 已提交
3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871

  // iterate_all_blocks theoretically traverses in random order; in
  // practice, we have only traversed the continuation if we are
  // inlining into a subroutine
  assert(continuation_existed ||
         !continuation()->is_set(BlockBegin::was_visited_flag),
         "continuation should not have been parsed yet if we created it");

  // At this point we are almost ready to return and resume parsing of
  // the caller back in the GraphBuilder. The only thing we want to do
  // first is an optimization: during parsing of the callee we
  // generated at least one Goto to the continuation block. If we
  // generated exactly one, and if the inlined method spanned exactly
  // one block (and we didn't have to Goto its entry), then we snip
  // off the Goto to the continuation, allowing control to fall
  // through back into the caller block and effectively performing
  // block merging. This allows load elimination and CSE to take place
  // across multiple callee scopes if they are relatively simple, and
  // is currently essential to making inlining profitable.
3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889
  if (num_returns() == 1
      && block() == orig_block
      && block() == inline_cleanup_block()) {
    _last  = inline_cleanup_return_prev();
    _state = inline_cleanup_state();
  } else if (continuation_preds == cont->number_of_preds()) {
    // Inlining caused that the instructions after the invoke in the
    // caller are not reachable any more. So skip filling this block
    // with instructions!
    assert(cont == continuation(), "");
    assert(_last && _last->as_BlockEnd(), "");
    _skip_block = true;
  } else {
    // Resume parsing in continuation block unless it was already parsed.
    // Note that if we don't change _last here, iteration in
    // iterate_bytecodes_for_block will stop when we return.
    if (!continuation()->is_set(BlockBegin::was_visited_flag)) {
      // add continuation to work list instead of parsing it immediately
D
duke 已提交
3890
      assert(_last && _last->as_BlockEnd(), "");
3891
      scope_data()->parent()->add_to_work_list(continuation());
D
duke 已提交
3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908
      _skip_block = true;
    }
  }

  // Fill the exception handler for synchronized methods with instructions
  if (callee->is_synchronized() && sync_handler->state() != NULL) {
    fill_sync_handler(lock, sync_handler);
  } else {
    pop_scope();
  }

  compilation()->notice_inlined_method(callee);

  return true;
}


3909
bool GraphBuilder::try_method_handle_inline(ciMethod* callee) {
3910 3911 3912 3913 3914 3915 3916 3917 3918 3919
  ValueStack* state_before = state()->copy_for_parsing();
  vmIntrinsics::ID iid = callee->intrinsic_id();
  switch (iid) {
  case vmIntrinsics::_invokeBasic:
    {
      // get MethodHandle receiver
      const int args_base = state()->stack_size() - callee->arg_size();
      ValueType* type = state()->stack_at(args_base)->type();
      if (type->is_constant()) {
        ciMethod* target = type->as_ObjectType()->constant_value()->as_method_handle()->get_vmtarget();
3920 3921 3922 3923 3924 3925 3926 3927
        // We don't do CHA here so only inline static and statically bindable methods.
        if (target->is_static() || target->can_be_statically_bound()) {
          Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual;
          if (try_inline(target, /*holder_known*/ true, bc)) {
            return true;
          }
        } else {
          print_inlining(target, "not static or statically bindable", /*success*/ false);
3928
        }
3929 3930
      } else {
        print_inlining(callee, "receiver not constant", /*success*/ false);
3931 3932
      }
    }
3933
    break;
3934

3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947
  case vmIntrinsics::_linkToVirtual:
  case vmIntrinsics::_linkToStatic:
  case vmIntrinsics::_linkToSpecial:
  case vmIntrinsics::_linkToInterface:
    {
      // pop MemberName argument
      const int args_base = state()->stack_size() - callee->arg_size();
      ValueType* type = apop()->type();
      if (type->is_constant()) {
        ciMethod* target = type->as_ObjectType()->constant_value()->as_member_name()->get_vmtarget();
        // If the target is another method handle invoke try recursivly to get
        // a better target.
        if (target->is_method_handle_intrinsic()) {
3948
          if (try_method_handle_inline(target)) {
3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979
            return true;
          }
        } else {
          ciSignature* signature = target->signature();
          const int receiver_skip = target->is_static() ? 0 : 1;
          // Cast receiver to its type.
          if (!target->is_static()) {
            ciKlass* tk = signature->accessing_klass();
            Value obj = state()->stack_at(args_base);
            if (obj->exact_type() == NULL &&
                obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) {
              TypeCast* c = new TypeCast(tk, obj, state_before);
              append(c);
              state()->stack_at_put(args_base, c);
            }
          }
          // Cast reference arguments to its type.
          for (int i = 0, j = 0; i < signature->count(); i++) {
            ciType* t = signature->type_at(i);
            if (t->is_klass()) {
              ciKlass* tk = t->as_klass();
              Value obj = state()->stack_at(args_base + receiver_skip + j);
              if (obj->exact_type() == NULL &&
                  obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) {
                TypeCast* c = new TypeCast(t, obj, state_before);
                append(c);
                state()->stack_at_put(args_base + receiver_skip + j, c);
              }
            }
            j += t->size();  // long and double take two slots
          }
3980 3981 3982 3983 3984 3985 3986 3987
          // We don't do CHA here so only inline static and statically bindable methods.
          if (target->is_static() || target->can_be_statically_bound()) {
            Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual;
            if (try_inline(target, /*holder_known*/ true, bc)) {
              return true;
            }
          } else {
            print_inlining(target, "not static or statically bindable", /*success*/ false);
3988 3989 3990 3991
          }
        }
      } else {
        print_inlining(callee, "MemberName not constant", /*success*/ false);
3992 3993
      }
    }
3994 3995 3996 3997 3998
    break;

  default:
    fatal(err_msg("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
    break;
3999
  }
4000
  set_state(state_before);
4001 4002 4003 4004
  return false;
}


D
duke 已提交
4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037
void GraphBuilder::inline_bailout(const char* msg) {
  assert(msg != NULL, "inline bailout msg must exist");
  _inline_bailout_msg = msg;
}


void GraphBuilder::clear_inline_bailout() {
  _inline_bailout_msg = NULL;
}


void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) {
  ScopeData* data = new ScopeData(NULL);
  data->set_scope(scope);
  data->set_bci2block(bci2block);
  _scope_data = data;
  _block = start;
}


void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) {
  IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false);
  scope()->add_callee(callee_scope);

  BlockListBuilder blb(compilation(), callee_scope, -1);
  CHECK_BAILOUT();

  if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) {
    // this scope can be inlined directly into the caller so remove
    // the block at bci 0.
    blb.bci2block()->at_put(0, NULL);
  }

R
roland 已提交
4038
  set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci())));
D
duke 已提交
4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155

  ScopeData* data = new ScopeData(scope_data());
  data->set_scope(callee_scope);
  data->set_bci2block(blb.bci2block());
  data->set_continuation(continuation);
  _scope_data = data;
}


void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) {
  ScopeData* data = new ScopeData(scope_data());
  data->set_parsing_jsr();
  data->set_jsr_entry_bci(jsr_dest_bci);
  data->set_jsr_return_address_local(-1);
  // Must clone bci2block list as we will be mutating it in order to
  // properly clone all blocks in jsr region as well as exception
  // handlers containing rets
  BlockList* new_bci2block = new BlockList(bci2block()->length());
  new_bci2block->push_all(bci2block());
  data->set_bci2block(new_bci2block);
  data->set_scope(scope());
  data->setup_jsr_xhandlers();
  data->set_continuation(continuation());
  data->set_jsr_continuation(jsr_continuation);
  _scope_data = data;
}


void GraphBuilder::pop_scope() {
  int number_of_locks = scope()->number_of_locks();
  _scope_data = scope_data()->parent();
  // accumulate minimum number of monitor slots to be reserved
  scope()->set_min_number_of_locks(number_of_locks);
}


void GraphBuilder::pop_scope_for_jsr() {
  _scope_data = scope_data()->parent();
}

bool GraphBuilder::append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile) {
  if (InlineUnsafeOps) {
    Values* args = state()->pop_arguments(callee->arg_size());
    null_check(args->at(0));
    Instruction* offset = args->at(2);
#ifndef _LP64
    offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
#endif
    Instruction* op = append(new UnsafeGetObject(t, args->at(1), offset, is_volatile));
    push(op->type(), op);
    compilation()->set_has_unsafe_access(true);
  }
  return InlineUnsafeOps;
}


bool GraphBuilder::append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile) {
  if (InlineUnsafeOps) {
    Values* args = state()->pop_arguments(callee->arg_size());
    null_check(args->at(0));
    Instruction* offset = args->at(2);
#ifndef _LP64
    offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
#endif
    Instruction* op = append(new UnsafePutObject(t, args->at(1), offset, args->at(3), is_volatile));
    compilation()->set_has_unsafe_access(true);
    kill_all();
  }
  return InlineUnsafeOps;
}


bool GraphBuilder::append_unsafe_get_raw(ciMethod* callee, BasicType t) {
  if (InlineUnsafeOps) {
    Values* args = state()->pop_arguments(callee->arg_size());
    null_check(args->at(0));
    Instruction* op = append(new UnsafeGetRaw(t, args->at(1), false));
    push(op->type(), op);
    compilation()->set_has_unsafe_access(true);
  }
  return InlineUnsafeOps;
}


bool GraphBuilder::append_unsafe_put_raw(ciMethod* callee, BasicType t) {
  if (InlineUnsafeOps) {
    Values* args = state()->pop_arguments(callee->arg_size());
    null_check(args->at(0));
    Instruction* op = append(new UnsafePutRaw(t, args->at(1), args->at(2)));
    compilation()->set_has_unsafe_access(true);
  }
  return InlineUnsafeOps;
}


bool GraphBuilder::append_unsafe_prefetch(ciMethod* callee, bool is_static, bool is_store) {
  if (InlineUnsafeOps) {
    Values* args = state()->pop_arguments(callee->arg_size());
    int obj_arg_index = 1; // Assume non-static case
    if (is_static) {
      obj_arg_index = 0;
    } else {
      null_check(args->at(0));
    }
    Instruction* offset = args->at(obj_arg_index + 1);
#ifndef _LP64
    offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
#endif
    Instruction* op = is_store ? append(new UnsafePrefetchWrite(args->at(obj_arg_index), offset))
                               : append(new UnsafePrefetchRead (args->at(obj_arg_index), offset));
    compilation()->set_has_unsafe_access(true);
  }
  return InlineUnsafeOps;
}


void GraphBuilder::append_unsafe_CAS(ciMethod* callee) {
R
roland 已提交
4156
  ValueStack* state_before = copy_state_for_exception();
D
duke 已提交
4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184
  ValueType* result_type = as_ValueType(callee->return_type());
  assert(result_type->is_int(), "int result");
  Values* args = state()->pop_arguments(callee->arg_size());

  // Pop off some args to speically handle, then push back
  Value newval = args->pop();
  Value cmpval = args->pop();
  Value offset = args->pop();
  Value src = args->pop();
  Value unsafe_obj = args->pop();

  // Separately handle the unsafe arg. It is not needed for code
  // generation, but must be null checked
  null_check(unsafe_obj);

#ifndef _LP64
  offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
#endif

  args->push(src);
  args->push(offset);
  args->push(cmpval);
  args->push(newval);

  // An unsafe CAS can alias with other field accesses, but we don't
  // know which ones so mark the state as no preserved.  This will
  // cause CSE to invalidate memory across it.
  bool preserves_state = false;
R
roland 已提交
4185
  Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state);
D
duke 已提交
4186 4187 4188 4189 4190 4191
  append_split(result);
  push(result_type, result);
  compilation()->set_has_unsafe_access(true);
}


4192
void GraphBuilder::print_inlining(ciMethod* callee, const char* msg, bool success) {
V
vlivanov 已提交
4193 4194 4195 4196 4197 4198 4199 4200
  CompileLog* log = compilation()->log();
  if (log != NULL) {
    if (success) {
      if (msg != NULL)
        log->inline_success(msg);
      else
        log->inline_success("receiver is statically known");
    } else {
4201 4202 4203 4204
      if (msg != NULL)
        log->inline_fail(msg);
      else
        log->inline_fail("reason unknown");
V
vlivanov 已提交
4205 4206 4207
    }
  }

4208 4209 4210
  if (!PrintInlining)  return;
  CompileTask::print_inlining(callee, scope()->level(), bci(), msg);
  if (success && CIPrintMethodCodes) {
D
duke 已提交
4211 4212 4213 4214
    callee->print_codes();
  }
}

4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230
bool GraphBuilder::append_unsafe_get_and_set_obj(ciMethod* callee, bool is_add) {
  if (InlineUnsafeOps) {
    Values* args = state()->pop_arguments(callee->arg_size());
    BasicType t = callee->return_type()->basic_type();
    null_check(args->at(0));
    Instruction* offset = args->at(2);
#ifndef _LP64
    offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT)));
#endif
    Instruction* op = append(new UnsafeGetAndSetObject(t, args->at(1), offset, args->at(3), is_add));
    compilation()->set_has_unsafe_access(true);
    kill_all();
    push(op->type(), op);
  }
  return InlineUnsafeOps;
}
D
duke 已提交
4231

4232
#ifndef PRODUCT
D
duke 已提交
4233 4234 4235 4236 4237
void GraphBuilder::print_stats() {
  vmap()->print();
}
#endif // PRODUCT

4238 4239
void GraphBuilder::profile_call(ciMethod* callee, Value recv, ciKlass* known_holder) {
  append(new ProfileCall(method(), bci(), callee, recv, known_holder));
D
duke 已提交
4240 4241
}

I
iveresov 已提交
4242 4243
void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) {
  append(new ProfileInvoke(callee, state));
D
duke 已提交
4244
}