1 /* 2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "c1/c1_CFGPrinter.hpp" 27 #include "c1/c1_Canonicalizer.hpp" 28 #include "c1/c1_Compilation.hpp" 29 #include "c1/c1_GraphBuilder.hpp" 30 #include "c1/c1_InstructionPrinter.hpp" 31 #include "ci/ciCallSite.hpp" 32 #include "ci/ciField.hpp" 33 #include "ci/ciKlass.hpp" 34 #include "ci/ciMethodHandle.hpp" 35 #include "compiler/compileBroker.hpp" 36 #include "interpreter/bytecode.hpp" 37 #include "runtime/sharedRuntime.hpp" 38 #include "runtime/compilationPolicy.hpp" 39 #include "utilities/bitMap.inline.hpp" 40 41 class BlockListBuilder VALUE_OBJ_CLASS_SPEC { 42 private: 43 Compilation* _compilation; 44 IRScope* _scope; 45 46 BlockList _blocks; // internal list of all blocks 47 BlockList* _bci2block; // mapping from bci to blocks for GraphBuilder 48 49 // fields used by mark_loops 50 BitMap _active; // for iteration of control flow graph 51 BitMap _visited; // for iteration of control flow graph 52 intArray _loop_map; // caches the information if a block is contained in a loop 53 int _next_loop_index; // next free loop number 54 int _next_block_number; // for reverse postorder numbering of blocks 55 56 // accessors 57 Compilation* compilation() const { return _compilation; } 58 IRScope* scope() const { return _scope; } 59 ciMethod* method() const { return scope()->method(); } 60 XHandlers* xhandlers() const { return scope()->xhandlers(); } 61 62 // unified bailout support 63 void bailout(const char* msg) const { compilation()->bailout(msg); } 64 bool bailed_out() const { return compilation()->bailed_out(); } 65 66 // helper functions 67 BlockBegin* make_block_at(int bci, BlockBegin* predecessor); 68 void handle_exceptions(BlockBegin* current, int cur_bci); 69 void handle_jsr(BlockBegin* current, int sr_bci, int next_bci); 70 void store_one(BlockBegin* current, int local); 71 void store_two(BlockBegin* current, int local); 72 void set_entries(int osr_bci); 73 void set_leaders(); 74 75 void make_loop_header(BlockBegin* block); 76 void mark_loops(); 77 int mark_loops(BlockBegin* b, bool in_subroutine); 78 79 // debugging 80 #ifndef PRODUCT 81 void print(); 82 #endif 83 84 public: 85 // creation 86 BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci); 87 88 // accessors for GraphBuilder 89 BlockList* bci2block() const { return _bci2block; } 90 }; 91 92 93 // Implementation of BlockListBuilder 94 95 BlockListBuilder::BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci) 96 : _compilation(compilation) 97 , _scope(scope) 98 , _blocks(16) 99 , _bci2block(new BlockList(scope->method()->code_size(), NULL)) 100 , _next_block_number(0) 101 , _active() // size not known yet 102 , _visited() // size not known yet 103 , _next_loop_index(0) 104 , _loop_map() // size not known yet 105 { 106 set_entries(osr_bci); 107 set_leaders(); 108 CHECK_BAILOUT(); 109 110 mark_loops(); 111 NOT_PRODUCT(if (PrintInitialBlockList) print()); 112 113 #ifndef PRODUCT 114 if (PrintCFGToFile) { 115 stringStream title; 116 title.print("BlockListBuilder "); 117 scope->method()->print_name(&title); 118 CFGPrinter::print_cfg(_bci2block, title.as_string(), false, false); 119 } 120 #endif 121 } 122 123 124 void BlockListBuilder::set_entries(int osr_bci) { 125 // generate start blocks 126 BlockBegin* std_entry = make_block_at(0, NULL); 127 if (scope()->caller() == NULL) { 128 std_entry->set(BlockBegin::std_entry_flag); 129 } 130 if (osr_bci != -1) { 131 BlockBegin* osr_entry = make_block_at(osr_bci, NULL); 132 osr_entry->set(BlockBegin::osr_entry_flag); 133 } 134 135 // generate exception entry blocks 136 XHandlers* list = xhandlers(); 137 const int n = list->length(); 138 for (int i = 0; i < n; i++) { 139 XHandler* h = list->handler_at(i); 140 BlockBegin* entry = make_block_at(h->handler_bci(), NULL); 141 entry->set(BlockBegin::exception_entry_flag); 142 h->set_entry_block(entry); 143 } 144 } 145 146 147 BlockBegin* BlockListBuilder::make_block_at(int cur_bci, BlockBegin* predecessor) { 148 assert(method()->bci_block_start().at(cur_bci), "wrong block starts of MethodLivenessAnalyzer"); 149 150 BlockBegin* block = _bci2block->at(cur_bci); 151 if (block == NULL) { 152 block = new BlockBegin(cur_bci); 153 block->init_stores_to_locals(method()->max_locals()); 154 _bci2block->at_put(cur_bci, block); 155 _blocks.append(block); 156 157 assert(predecessor == NULL || predecessor->bci() < cur_bci, "targets for backward branches must already exist"); 158 } 159 160 if (predecessor != NULL) { 161 if (block->is_set(BlockBegin::exception_entry_flag)) { 162 BAILOUT_("Exception handler can be reached by both normal and exceptional control flow", block); 163 } 164 165 predecessor->add_successor(block); 166 block->increment_total_preds(); 167 } 168 169 return block; 170 } 171 172 173 inline void BlockListBuilder::store_one(BlockBegin* current, int local) { 174 current->stores_to_locals().set_bit(local); 175 } 176 inline void BlockListBuilder::store_two(BlockBegin* current, int local) { 177 store_one(current, local); 178 store_one(current, local + 1); 179 } 180 181 182 void BlockListBuilder::handle_exceptions(BlockBegin* current, int cur_bci) { 183 // Draws edges from a block to its exception handlers 184 XHandlers* list = xhandlers(); 185 const int n = list->length(); 186 187 for (int i = 0; i < n; i++) { 188 XHandler* h = list->handler_at(i); 189 190 if (h->covers(cur_bci)) { 191 BlockBegin* entry = h->entry_block(); 192 assert(entry != NULL && entry == _bci2block->at(h->handler_bci()), "entry must be set"); 193 assert(entry->is_set(BlockBegin::exception_entry_flag), "flag must be set"); 194 195 // add each exception handler only once 196 if (!current->is_successor(entry)) { 197 current->add_successor(entry); 198 entry->increment_total_preds(); 199 } 200 201 // stop when reaching catchall 202 if (h->catch_type() == 0) break; 203 } 204 } 205 } 206 207 void BlockListBuilder::handle_jsr(BlockBegin* current, int sr_bci, int next_bci) { 208 // start a new block after jsr-bytecode and link this block into cfg 209 make_block_at(next_bci, current); 210 211 // start a new block at the subroutine entry at mark it with special flag 212 BlockBegin* sr_block = make_block_at(sr_bci, current); 213 if (!sr_block->is_set(BlockBegin::subroutine_entry_flag)) { 214 sr_block->set(BlockBegin::subroutine_entry_flag); 215 } 216 } 217 218 219 void BlockListBuilder::set_leaders() { 220 bool has_xhandlers = xhandlers()->has_handlers(); 221 BlockBegin* current = NULL; 222 223 // The information which bci starts a new block simplifies the analysis 224 // Without it, backward branches could jump to a bci where no block was created 225 // during bytecode iteration. This would require the creation of a new block at the 226 // branch target and a modification of the successor lists. 227 BitMap bci_block_start = method()->bci_block_start(); 228 229 ciBytecodeStream s(method()); 230 while (s.next() != ciBytecodeStream::EOBC()) { 231 int cur_bci = s.cur_bci(); 232 233 if (bci_block_start.at(cur_bci)) { 234 current = make_block_at(cur_bci, current); 235 } 236 assert(current != NULL, "must have current block"); 237 238 if (has_xhandlers && GraphBuilder::can_trap(method(), s.cur_bc())) { 239 handle_exceptions(current, cur_bci); 240 } 241 242 switch (s.cur_bc()) { 243 // track stores to local variables for selective creation of phi functions 244 case Bytecodes::_iinc: store_one(current, s.get_index()); break; 245 case Bytecodes::_istore: store_one(current, s.get_index()); break; 246 case Bytecodes::_lstore: store_two(current, s.get_index()); break; 247 case Bytecodes::_fstore: store_one(current, s.get_index()); break; 248 case Bytecodes::_dstore: store_two(current, s.get_index()); break; 249 case Bytecodes::_astore: store_one(current, s.get_index()); break; 250 case Bytecodes::_istore_0: store_one(current, 0); break; 251 case Bytecodes::_istore_1: store_one(current, 1); break; 252 case Bytecodes::_istore_2: store_one(current, 2); break; 253 case Bytecodes::_istore_3: store_one(current, 3); break; 254 case Bytecodes::_lstore_0: store_two(current, 0); break; 255 case Bytecodes::_lstore_1: store_two(current, 1); break; 256 case Bytecodes::_lstore_2: store_two(current, 2); break; 257 case Bytecodes::_lstore_3: store_two(current, 3); break; 258 case Bytecodes::_fstore_0: store_one(current, 0); break; 259 case Bytecodes::_fstore_1: store_one(current, 1); break; 260 case Bytecodes::_fstore_2: store_one(current, 2); break; 261 case Bytecodes::_fstore_3: store_one(current, 3); break; 262 case Bytecodes::_dstore_0: store_two(current, 0); break; 263 case Bytecodes::_dstore_1: store_two(current, 1); break; 264 case Bytecodes::_dstore_2: store_two(current, 2); break; 265 case Bytecodes::_dstore_3: store_two(current, 3); break; 266 case Bytecodes::_astore_0: store_one(current, 0); break; 267 case Bytecodes::_astore_1: store_one(current, 1); break; 268 case Bytecodes::_astore_2: store_one(current, 2); break; 269 case Bytecodes::_astore_3: store_one(current, 3); break; 270 271 // track bytecodes that affect the control flow 272 case Bytecodes::_athrow: // fall through 273 case Bytecodes::_ret: // fall through 274 case Bytecodes::_ireturn: // fall through 275 case Bytecodes::_lreturn: // fall through 276 case Bytecodes::_freturn: // fall through 277 case Bytecodes::_dreturn: // fall through 278 case Bytecodes::_areturn: // fall through 279 case Bytecodes::_return: 280 current = NULL; 281 break; 282 283 case Bytecodes::_ifeq: // fall through 284 case Bytecodes::_ifne: // fall through 285 case Bytecodes::_iflt: // fall through 286 case Bytecodes::_ifge: // fall through 287 case Bytecodes::_ifgt: // fall through 288 case Bytecodes::_ifle: // fall through 289 case Bytecodes::_if_icmpeq: // fall through 290 case Bytecodes::_if_icmpne: // fall through 291 case Bytecodes::_if_icmplt: // fall through 292 case Bytecodes::_if_icmpge: // fall through 293 case Bytecodes::_if_icmpgt: // fall through 294 case Bytecodes::_if_icmple: // fall through 295 case Bytecodes::_if_acmpeq: // fall through 296 case Bytecodes::_if_acmpne: // fall through 297 case Bytecodes::_ifnull: // fall through 298 case Bytecodes::_ifnonnull: 299 make_block_at(s.next_bci(), current); 300 make_block_at(s.get_dest(), current); 301 current = NULL; 302 break; 303 304 case Bytecodes::_goto: 305 make_block_at(s.get_dest(), current); 306 current = NULL; 307 break; 308 309 case Bytecodes::_goto_w: 310 make_block_at(s.get_far_dest(), current); 311 current = NULL; 312 break; 313 314 case Bytecodes::_jsr: 315 handle_jsr(current, s.get_dest(), s.next_bci()); 316 current = NULL; 317 break; 318 319 case Bytecodes::_jsr_w: 320 handle_jsr(current, s.get_far_dest(), s.next_bci()); 321 current = NULL; 322 break; 323 324 case Bytecodes::_tableswitch: { 325 // set block for each case 326 Bytecode_tableswitch sw(&s); 327 int l = sw.length(); 328 for (int i = 0; i < l; i++) { 329 make_block_at(cur_bci + sw.dest_offset_at(i), current); 330 } 331 make_block_at(cur_bci + sw.default_offset(), current); 332 current = NULL; 333 break; 334 } 335 336 case Bytecodes::_lookupswitch: { 337 // set block for each case 338 Bytecode_lookupswitch sw(&s); 339 int l = sw.number_of_pairs(); 340 for (int i = 0; i < l; i++) { 341 make_block_at(cur_bci + sw.pair_at(i).offset(), current); 342 } 343 make_block_at(cur_bci + sw.default_offset(), current); 344 current = NULL; 345 break; 346 } 347 } 348 } 349 } 350 351 352 void BlockListBuilder::mark_loops() { 353 ResourceMark rm; 354 355 _active = BitMap(BlockBegin::number_of_blocks()); _active.clear(); 356 _visited = BitMap(BlockBegin::number_of_blocks()); _visited.clear(); 357 _loop_map = intArray(BlockBegin::number_of_blocks(), 0); 358 _next_loop_index = 0; 359 _next_block_number = _blocks.length(); 360 361 // recursively iterate the control flow graph 362 mark_loops(_bci2block->at(0), false); 363 assert(_next_block_number >= 0, "invalid block numbers"); 364 } 365 366 void BlockListBuilder::make_loop_header(BlockBegin* block) { 367 if (block->is_set(BlockBegin::exception_entry_flag)) { 368 // exception edges may look like loops but don't mark them as such 369 // since it screws up block ordering. 370 return; 371 } 372 if (!block->is_set(BlockBegin::parser_loop_header_flag)) { 373 block->set(BlockBegin::parser_loop_header_flag); 374 375 assert(_loop_map.at(block->block_id()) == 0, "must not be set yet"); 376 assert(0 <= _next_loop_index && _next_loop_index < BitsPerInt, "_next_loop_index is used as a bit-index in integer"); 377 _loop_map.at_put(block->block_id(), 1 << _next_loop_index); 378 if (_next_loop_index < 31) _next_loop_index++; 379 } else { 380 // block already marked as loop header 381 assert(is_power_of_2((unsigned int)_loop_map.at(block->block_id())), "exactly one bit must be set"); 382 } 383 } 384 385 int BlockListBuilder::mark_loops(BlockBegin* block, bool in_subroutine) { 386 int block_id = block->block_id(); 387 388 if (_visited.at(block_id)) { 389 if (_active.at(block_id)) { 390 // reached block via backward branch 391 make_loop_header(block); 392 } 393 // return cached loop information for this block 394 return _loop_map.at(block_id); 395 } 396 397 if (block->is_set(BlockBegin::subroutine_entry_flag)) { 398 in_subroutine = true; 399 } 400 401 // set active and visited bits before successors are processed 402 _visited.set_bit(block_id); 403 _active.set_bit(block_id); 404 405 intptr_t loop_state = 0; 406 for (int i = block->number_of_sux() - 1; i >= 0; i--) { 407 // recursively process all successors 408 loop_state |= mark_loops(block->sux_at(i), in_subroutine); 409 } 410 411 // clear active-bit after all successors are processed 412 _active.clear_bit(block_id); 413 414 // reverse-post-order numbering of all blocks 415 block->set_depth_first_number(_next_block_number); 416 _next_block_number--; 417 418 if (loop_state != 0 || in_subroutine ) { 419 // block is contained at least in one loop, so phi functions are necessary 420 // phi functions are also necessary for all locals stored in a subroutine 421 scope()->requires_phi_function().set_union(block->stores_to_locals()); 422 } 423 424 if (block->is_set(BlockBegin::parser_loop_header_flag)) { 425 int header_loop_state = _loop_map.at(block_id); 426 assert(is_power_of_2((unsigned)header_loop_state), "exactly one bit must be set"); 427 428 // If the highest bit is set (i.e. when integer value is negative), the method 429 // has 32 or more loops. This bit is never cleared because it is used for multiple loops 430 if (header_loop_state >= 0) { 431 clear_bits(loop_state, header_loop_state); 432 } 433 } 434 435 // cache and return loop information for this block 436 _loop_map.at_put(block_id, loop_state); 437 return loop_state; 438 } 439 440 441 #ifndef PRODUCT 442 443 int compare_depth_first(BlockBegin** a, BlockBegin** b) { 444 return (*a)->depth_first_number() - (*b)->depth_first_number(); 445 } 446 447 void BlockListBuilder::print() { 448 tty->print("----- initial block list of BlockListBuilder for method "); 449 method()->print_short_name(); 450 tty->cr(); 451 452 // better readability if blocks are sorted in processing order 453 _blocks.sort(compare_depth_first); 454 455 for (int i = 0; i < _blocks.length(); i++) { 456 BlockBegin* cur = _blocks.at(i); 457 tty->print("%4d: B%-4d bci: %-4d preds: %-4d ", cur->depth_first_number(), cur->block_id(), cur->bci(), cur->total_preds()); 458 459 tty->print(cur->is_set(BlockBegin::std_entry_flag) ? " std" : " "); 460 tty->print(cur->is_set(BlockBegin::osr_entry_flag) ? " osr" : " "); 461 tty->print(cur->is_set(BlockBegin::exception_entry_flag) ? " ex" : " "); 462 tty->print(cur->is_set(BlockBegin::subroutine_entry_flag) ? " sr" : " "); 463 tty->print(cur->is_set(BlockBegin::parser_loop_header_flag) ? " lh" : " "); 464 465 if (cur->number_of_sux() > 0) { 466 tty->print(" sux: "); 467 for (int j = 0; j < cur->number_of_sux(); j++) { 468 BlockBegin* sux = cur->sux_at(j); 469 tty->print("B%d ", sux->block_id()); 470 } 471 } 472 tty->cr(); 473 } 474 } 475 476 #endif 477 478 479 // A simple growable array of Values indexed by ciFields 480 class FieldBuffer: public CompilationResourceObj { 481 private: 482 GrowableArray<Value> _values; 483 484 public: 485 FieldBuffer() {} 486 487 void kill() { 488 _values.trunc_to(0); 489 } 490 491 Value at(ciField* field) { 492 assert(field->holder()->is_loaded(), "must be a loaded field"); 493 int offset = field->offset(); 494 if (offset < _values.length()) { 495 return _values.at(offset); 496 } else { 497 return NULL; 498 } 499 } 500 501 void at_put(ciField* field, Value value) { 502 assert(field->holder()->is_loaded(), "must be a loaded field"); 503 int offset = field->offset(); 504 _values.at_put_grow(offset, value, NULL); 505 } 506 507 }; 508 509 510 // MemoryBuffer is fairly simple model of the current state of memory. 511 // It partitions memory into several pieces. The first piece is 512 // generic memory where little is known about the owner of the memory. 513 // This is conceptually represented by the tuple <O, F, V> which says 514 // that the field F of object O has value V. This is flattened so 515 // that F is represented by the offset of the field and the parallel 516 // arrays _objects and _values are used for O and V. Loads of O.F can 517 // simply use V. Newly allocated objects are kept in a separate list 518 // along with a parallel array for each object which represents the 519 // current value of its fields. Stores of the default value to fields 520 // which have never been stored to before are eliminated since they 521 // are redundant. Once newly allocated objects are stored into 522 // another object or they are passed out of the current compile they 523 // are treated like generic memory. 524 525 class MemoryBuffer: public CompilationResourceObj { 526 private: 527 FieldBuffer _values; 528 GrowableArray<Value> _objects; 529 GrowableArray<Value> _newobjects; 530 GrowableArray<FieldBuffer*> _fields; 531 532 public: 533 MemoryBuffer() {} 534 535 StoreField* store(StoreField* st) { 536 if (!EliminateFieldAccess) { 537 return st; 538 } 539 540 Value object = st->obj(); 541 Value value = st->value(); 542 ciField* field = st->field(); 543 if (field->holder()->is_loaded()) { 544 int offset = field->offset(); 545 int index = _newobjects.find(object); 546 if (index != -1) { 547 // newly allocated object with no other stores performed on this field 548 FieldBuffer* buf = _fields.at(index); 549 if (buf->at(field) == NULL && is_default_value(value)) { 550 #ifndef PRODUCT 551 if (PrintIRDuringConstruction && Verbose) { 552 tty->print_cr("Eliminated store for object %d:", index); 553 st->print_line(); 554 } 555 #endif 556 return NULL; 557 } else { 558 buf->at_put(field, value); 559 } 560 } else { 561 _objects.at_put_grow(offset, object, NULL); 562 _values.at_put(field, value); 563 } 564 565 store_value(value); 566 } else { 567 // if we held onto field names we could alias based on names but 568 // we don't know what's being stored to so kill it all. 569 kill(); 570 } 571 return st; 572 } 573 574 575 // return true if this value correspond to the default value of a field. 576 bool is_default_value(Value value) { 577 Constant* con = value->as_Constant(); 578 if (con) { 579 switch (con->type()->tag()) { 580 case intTag: return con->type()->as_IntConstant()->value() == 0; 581 case longTag: return con->type()->as_LongConstant()->value() == 0; 582 case floatTag: return jint_cast(con->type()->as_FloatConstant()->value()) == 0; 583 case doubleTag: return jlong_cast(con->type()->as_DoubleConstant()->value()) == jlong_cast(0); 584 case objectTag: return con->type() == objectNull; 585 default: ShouldNotReachHere(); 586 } 587 } 588 return false; 589 } 590 591 592 // return either the actual value of a load or the load itself 593 Value load(LoadField* load) { 594 if (!EliminateFieldAccess) { 595 return load; 596 } 597 598 if (RoundFPResults && UseSSE < 2 && load->type()->is_float_kind()) { 599 // can't skip load since value might get rounded as a side effect 600 return load; 601 } 602 603 ciField* field = load->field(); 604 Value object = load->obj(); 605 if (field->holder()->is_loaded() && !field->is_volatile()) { 606 int offset = field->offset(); 607 Value result = NULL; 608 int index = _newobjects.find(object); 609 if (index != -1) { 610 result = _fields.at(index)->at(field); 611 } else if (_objects.at_grow(offset, NULL) == object) { 612 result = _values.at(field); 613 } 614 if (result != NULL) { 615 #ifndef PRODUCT 616 if (PrintIRDuringConstruction && Verbose) { 617 tty->print_cr("Eliminated load: "); 618 load->print_line(); 619 } 620 #endif 621 assert(result->type()->tag() == load->type()->tag(), "wrong types"); 622 return result; 623 } 624 } 625 return load; 626 } 627 628 // Record this newly allocated object 629 void new_instance(NewInstance* object) { 630 int index = _newobjects.length(); 631 _newobjects.append(object); 632 if (_fields.at_grow(index, NULL) == NULL) { 633 _fields.at_put(index, new FieldBuffer()); 634 } else { 635 _fields.at(index)->kill(); 636 } 637 } 638 639 void store_value(Value value) { 640 int index = _newobjects.find(value); 641 if (index != -1) { 642 // stored a newly allocated object into another object. 643 // Assume we've lost track of it as separate slice of memory. 644 // We could do better by keeping track of whether individual 645 // fields could alias each other. 646 _newobjects.remove_at(index); 647 // pull out the field info and store it at the end up the list 648 // of field info list to be reused later. 649 _fields.append(_fields.at(index)); 650 _fields.remove_at(index); 651 } 652 } 653 654 void kill() { 655 _newobjects.trunc_to(0); 656 _objects.trunc_to(0); 657 _values.kill(); 658 } 659 }; 660 661 662 // Implementation of GraphBuilder's ScopeData 663 664 GraphBuilder::ScopeData::ScopeData(ScopeData* parent) 665 : _parent(parent) 666 , _bci2block(NULL) 667 , _scope(NULL) 668 , _has_handler(false) 669 , _stream(NULL) 670 , _work_list(NULL) 671 , _parsing_jsr(false) 672 , _jsr_xhandlers(NULL) 673 , _caller_stack_size(-1) 674 , _continuation(NULL) 675 , _num_returns(0) 676 , _cleanup_block(NULL) 677 , _cleanup_return_prev(NULL) 678 , _cleanup_state(NULL) 679 { 680 if (parent != NULL) { 681 _max_inline_size = (intx) ((float) NestedInliningSizeRatio * (float) parent->max_inline_size() / 100.0f); 682 } else { 683 _max_inline_size = MaxInlineSize; 684 } 685 if (_max_inline_size < MaxTrivialSize) { 686 _max_inline_size = MaxTrivialSize; 687 } 688 } 689 690 691 void GraphBuilder::kill_all() { 692 if (UseLocalValueNumbering) { 693 vmap()->kill_all(); 694 } 695 _memory->kill(); 696 } 697 698 699 BlockBegin* GraphBuilder::ScopeData::block_at(int bci) { 700 if (parsing_jsr()) { 701 // It is necessary to clone all blocks associated with a 702 // subroutine, including those for exception handlers in the scope 703 // of the method containing the jsr (because those exception 704 // handlers may contain ret instructions in some cases). 705 BlockBegin* block = bci2block()->at(bci); 706 if (block != NULL && block == parent()->bci2block()->at(bci)) { 707 BlockBegin* new_block = new BlockBegin(block->bci()); 708 #ifndef PRODUCT 709 if (PrintInitialBlockList) { 710 tty->print_cr("CFG: cloned block %d (bci %d) as block %d for jsr", 711 block->block_id(), block->bci(), new_block->block_id()); 712 } 713 #endif 714 // copy data from cloned blocked 715 new_block->set_depth_first_number(block->depth_first_number()); 716 if (block->is_set(BlockBegin::parser_loop_header_flag)) new_block->set(BlockBegin::parser_loop_header_flag); 717 // Preserve certain flags for assertion checking 718 if (block->is_set(BlockBegin::subroutine_entry_flag)) new_block->set(BlockBegin::subroutine_entry_flag); 719 if (block->is_set(BlockBegin::exception_entry_flag)) new_block->set(BlockBegin::exception_entry_flag); 720 721 // copy was_visited_flag to allow early detection of bailouts 722 // if a block that is used in a jsr has already been visited before, 723 // it is shared between the normal control flow and a subroutine 724 // BlockBegin::try_merge returns false when the flag is set, this leads 725 // to a compilation bailout 726 if (block->is_set(BlockBegin::was_visited_flag)) new_block->set(BlockBegin::was_visited_flag); 727 728 bci2block()->at_put(bci, new_block); 729 block = new_block; 730 } 731 return block; 732 } else { 733 return bci2block()->at(bci); 734 } 735 } 736 737 738 XHandlers* GraphBuilder::ScopeData::xhandlers() const { 739 if (_jsr_xhandlers == NULL) { 740 assert(!parsing_jsr(), ""); 741 return scope()->xhandlers(); 742 } 743 assert(parsing_jsr(), ""); 744 return _jsr_xhandlers; 745 } 746 747 748 void GraphBuilder::ScopeData::set_scope(IRScope* scope) { 749 _scope = scope; 750 bool parent_has_handler = false; 751 if (parent() != NULL) { 752 parent_has_handler = parent()->has_handler(); 753 } 754 _has_handler = parent_has_handler || scope->xhandlers()->has_handlers(); 755 } 756 757 758 void GraphBuilder::ScopeData::set_inline_cleanup_info(BlockBegin* block, 759 Instruction* return_prev, 760 ValueStack* return_state) { 761 _cleanup_block = block; 762 _cleanup_return_prev = return_prev; 763 _cleanup_state = return_state; 764 } 765 766 767 void GraphBuilder::ScopeData::add_to_work_list(BlockBegin* block) { 768 if (_work_list == NULL) { 769 _work_list = new BlockList(); 770 } 771 772 if (!block->is_set(BlockBegin::is_on_work_list_flag)) { 773 // Do not start parsing the continuation block while in a 774 // sub-scope 775 if (parsing_jsr()) { 776 if (block == jsr_continuation()) { 777 return; 778 } 779 } else { 780 if (block == continuation()) { 781 return; 782 } 783 } 784 block->set(BlockBegin::is_on_work_list_flag); 785 _work_list->push(block); 786 787 sort_top_into_worklist(_work_list, block); 788 } 789 } 790 791 792 void GraphBuilder::sort_top_into_worklist(BlockList* worklist, BlockBegin* top) { 793 assert(worklist->top() == top, ""); 794 // sort block descending into work list 795 const int dfn = top->depth_first_number(); 796 assert(dfn != -1, "unknown depth first number"); 797 int i = worklist->length()-2; 798 while (i >= 0) { 799 BlockBegin* b = worklist->at(i); 800 if (b->depth_first_number() < dfn) { 801 worklist->at_put(i+1, b); 802 } else { 803 break; 804 } 805 i --; 806 } 807 if (i >= -1) worklist->at_put(i + 1, top); 808 } 809 810 811 BlockBegin* GraphBuilder::ScopeData::remove_from_work_list() { 812 if (is_work_list_empty()) { 813 return NULL; 814 } 815 return _work_list->pop(); 816 } 817 818 819 bool GraphBuilder::ScopeData::is_work_list_empty() const { 820 return (_work_list == NULL || _work_list->length() == 0); 821 } 822 823 824 void GraphBuilder::ScopeData::setup_jsr_xhandlers() { 825 assert(parsing_jsr(), ""); 826 // clone all the exception handlers from the scope 827 XHandlers* handlers = new XHandlers(scope()->xhandlers()); 828 const int n = handlers->length(); 829 for (int i = 0; i < n; i++) { 830 // The XHandlers need to be adjusted to dispatch to the cloned 831 // handler block instead of the default one but the synthetic 832 // unlocker needs to be handled specially. The synthetic unlocker 833 // should be left alone since there can be only one and all code 834 // should dispatch to the same one. 835 XHandler* h = handlers->handler_at(i); 836 assert(h->handler_bci() != SynchronizationEntryBCI, "must be real"); 837 h->set_entry_block(block_at(h->handler_bci())); 838 } 839 _jsr_xhandlers = handlers; 840 } 841 842 843 int GraphBuilder::ScopeData::num_returns() { 844 if (parsing_jsr()) { 845 return parent()->num_returns(); 846 } 847 return _num_returns; 848 } 849 850 851 void GraphBuilder::ScopeData::incr_num_returns() { 852 if (parsing_jsr()) { 853 parent()->incr_num_returns(); 854 } else { 855 ++_num_returns; 856 } 857 } 858 859 860 // Implementation of GraphBuilder 861 862 #define INLINE_BAILOUT(msg) { inline_bailout(msg); return false; } 863 864 865 void GraphBuilder::load_constant() { 866 ciConstant con = stream()->get_constant(); 867 if (con.basic_type() == T_ILLEGAL) { 868 BAILOUT("could not resolve a constant"); 869 } else { 870 ValueType* t = illegalType; 871 ValueStack* patch_state = NULL; 872 switch (con.basic_type()) { 873 case T_BOOLEAN: t = new IntConstant (con.as_boolean()); break; 874 case T_BYTE : t = new IntConstant (con.as_byte ()); break; 875 case T_CHAR : t = new IntConstant (con.as_char ()); break; 876 case T_SHORT : t = new IntConstant (con.as_short ()); break; 877 case T_INT : t = new IntConstant (con.as_int ()); break; 878 case T_LONG : t = new LongConstant (con.as_long ()); break; 879 case T_FLOAT : t = new FloatConstant (con.as_float ()); break; 880 case T_DOUBLE : t = new DoubleConstant (con.as_double ()); break; 881 case T_ARRAY : t = new ArrayConstant (con.as_object ()->as_array ()); break; 882 case T_OBJECT : 883 { 884 ciObject* obj = con.as_object(); 885 if (!obj->is_loaded() 886 || (PatchALot && obj->klass() != ciEnv::current()->String_klass())) { 887 patch_state = copy_state_before(); 888 t = new ObjectConstant(obj); 889 } else { 890 assert(!obj->is_klass(), "must be java_mirror of klass"); 891 t = new InstanceConstant(obj->as_instance()); 892 } 893 break; 894 } 895 default : ShouldNotReachHere(); 896 } 897 Value x; 898 if (patch_state != NULL) { 899 x = new Constant(t, patch_state); 900 } else { 901 x = new Constant(t); 902 } 903 push(t, append(x)); 904 } 905 } 906 907 908 void GraphBuilder::load_local(ValueType* type, int index) { 909 Value x = state()->local_at(index); 910 assert(x != NULL && !x->type()->is_illegal(), "access of illegal local variable"); 911 push(type, x); 912 } 913 914 915 void GraphBuilder::store_local(ValueType* type, int index) { 916 Value x = pop(type); 917 store_local(state(), x, type, index); 918 } 919 920 921 void GraphBuilder::store_local(ValueStack* state, Value x, ValueType* type, int index) { 922 if (parsing_jsr()) { 923 // We need to do additional tracking of the location of the return 924 // address for jsrs since we don't handle arbitrary jsr/ret 925 // constructs. Here we are figuring out in which circumstances we 926 // need to bail out. 927 if (x->type()->is_address()) { 928 scope_data()->set_jsr_return_address_local(index); 929 930 // Also check parent jsrs (if any) at this time to see whether 931 // they are using this local. We don't handle skipping over a 932 // ret. 933 for (ScopeData* cur_scope_data = scope_data()->parent(); 934 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope(); 935 cur_scope_data = cur_scope_data->parent()) { 936 if (cur_scope_data->jsr_return_address_local() == index) { 937 BAILOUT("subroutine overwrites return address from previous subroutine"); 938 } 939 } 940 } else if (index == scope_data()->jsr_return_address_local()) { 941 scope_data()->set_jsr_return_address_local(-1); 942 } 943 } 944 945 state->store_local(index, round_fp(x)); 946 } 947 948 949 void GraphBuilder::load_indexed(BasicType type) { 950 ValueStack* state_before = copy_state_for_exception(); 951 Value index = ipop(); 952 Value array = apop(); 953 Value length = NULL; 954 if (CSEArrayLength || 955 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) || 956 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) { 957 length = append(new ArrayLength(array, state_before)); 958 } 959 push(as_ValueType(type), append(new LoadIndexed(array, index, length, type, state_before))); 960 } 961 962 963 void GraphBuilder::store_indexed(BasicType type) { 964 ValueStack* state_before = copy_state_for_exception(); 965 Value value = pop(as_ValueType(type)); 966 Value index = ipop(); 967 Value array = apop(); 968 Value length = NULL; 969 if (CSEArrayLength || 970 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) || 971 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) { 972 length = append(new ArrayLength(array, state_before)); 973 } 974 StoreIndexed* result = new StoreIndexed(array, index, length, type, value, state_before); 975 append(result); 976 _memory->store_value(value); 977 978 if (type == T_OBJECT && is_profiling()) { 979 // Note that we'd collect profile data in this method if we wanted it. 980 compilation()->set_would_profile(true); 981 982 if (profile_checkcasts()) { 983 result->set_profiled_method(method()); 984 result->set_profiled_bci(bci()); 985 result->set_should_profile(true); 986 } 987 } 988 } 989 990 991 void GraphBuilder::stack_op(Bytecodes::Code code) { 992 switch (code) { 993 case Bytecodes::_pop: 994 { state()->raw_pop(); 995 } 996 break; 997 case Bytecodes::_pop2: 998 { state()->raw_pop(); 999 state()->raw_pop(); 1000 } 1001 break; 1002 case Bytecodes::_dup: 1003 { Value w = state()->raw_pop(); 1004 state()->raw_push(w); 1005 state()->raw_push(w); 1006 } 1007 break; 1008 case Bytecodes::_dup_x1: 1009 { Value w1 = state()->raw_pop(); 1010 Value w2 = state()->raw_pop(); 1011 state()->raw_push(w1); 1012 state()->raw_push(w2); 1013 state()->raw_push(w1); 1014 } 1015 break; 1016 case Bytecodes::_dup_x2: 1017 { Value w1 = state()->raw_pop(); 1018 Value w2 = state()->raw_pop(); 1019 Value w3 = state()->raw_pop(); 1020 state()->raw_push(w1); 1021 state()->raw_push(w3); 1022 state()->raw_push(w2); 1023 state()->raw_push(w1); 1024 } 1025 break; 1026 case Bytecodes::_dup2: 1027 { Value w1 = state()->raw_pop(); 1028 Value w2 = state()->raw_pop(); 1029 state()->raw_push(w2); 1030 state()->raw_push(w1); 1031 state()->raw_push(w2); 1032 state()->raw_push(w1); 1033 } 1034 break; 1035 case Bytecodes::_dup2_x1: 1036 { Value w1 = state()->raw_pop(); 1037 Value w2 = state()->raw_pop(); 1038 Value w3 = state()->raw_pop(); 1039 state()->raw_push(w2); 1040 state()->raw_push(w1); 1041 state()->raw_push(w3); 1042 state()->raw_push(w2); 1043 state()->raw_push(w1); 1044 } 1045 break; 1046 case Bytecodes::_dup2_x2: 1047 { Value w1 = state()->raw_pop(); 1048 Value w2 = state()->raw_pop(); 1049 Value w3 = state()->raw_pop(); 1050 Value w4 = state()->raw_pop(); 1051 state()->raw_push(w2); 1052 state()->raw_push(w1); 1053 state()->raw_push(w4); 1054 state()->raw_push(w3); 1055 state()->raw_push(w2); 1056 state()->raw_push(w1); 1057 } 1058 break; 1059 case Bytecodes::_swap: 1060 { Value w1 = state()->raw_pop(); 1061 Value w2 = state()->raw_pop(); 1062 state()->raw_push(w1); 1063 state()->raw_push(w2); 1064 } 1065 break; 1066 default: 1067 ShouldNotReachHere(); 1068 break; 1069 } 1070 } 1071 1072 1073 void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) { 1074 Value y = pop(type); 1075 Value x = pop(type); 1076 // NOTE: strictfp can be queried from current method since we don't 1077 // inline methods with differing strictfp bits 1078 Value res = new ArithmeticOp(code, x, y, method()->is_strict(), state_before); 1079 // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level 1080 res = append(res); 1081 if (method()->is_strict()) { 1082 res = round_fp(res); 1083 } 1084 push(type, res); 1085 } 1086 1087 1088 void GraphBuilder::negate_op(ValueType* type) { 1089 push(type, append(new NegateOp(pop(type)))); 1090 } 1091 1092 1093 void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) { 1094 Value s = ipop(); 1095 Value x = pop(type); 1096 // try to simplify 1097 // Note: This code should go into the canonicalizer as soon as it can 1098 // can handle canonicalized forms that contain more than one node. 1099 if (CanonicalizeNodes && code == Bytecodes::_iushr) { 1100 // pattern: x >>> s 1101 IntConstant* s1 = s->type()->as_IntConstant(); 1102 if (s1 != NULL) { 1103 // pattern: x >>> s1, with s1 constant 1104 ShiftOp* l = x->as_ShiftOp(); 1105 if (l != NULL && l->op() == Bytecodes::_ishl) { 1106 // pattern: (a << b) >>> s1 1107 IntConstant* s0 = l->y()->type()->as_IntConstant(); 1108 if (s0 != NULL) { 1109 // pattern: (a << s0) >>> s1 1110 const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts 1111 const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts 1112 if (s0c == s1c) { 1113 if (s0c == 0) { 1114 // pattern: (a << 0) >>> 0 => simplify to: a 1115 ipush(l->x()); 1116 } else { 1117 // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant 1118 assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases"); 1119 const int m = (1 << (BitsPerInt - s0c)) - 1; 1120 Value s = append(new Constant(new IntConstant(m))); 1121 ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s))); 1122 } 1123 return; 1124 } 1125 } 1126 } 1127 } 1128 } 1129 // could not simplify 1130 push(type, append(new ShiftOp(code, x, s))); 1131 } 1132 1133 1134 void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) { 1135 Value y = pop(type); 1136 Value x = pop(type); 1137 push(type, append(new LogicOp(code, x, y))); 1138 } 1139 1140 1141 void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) { 1142 ValueStack* state_before = copy_state_before(); 1143 Value y = pop(type); 1144 Value x = pop(type); 1145 ipush(append(new CompareOp(code, x, y, state_before))); 1146 } 1147 1148 1149 void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) { 1150 push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to)))); 1151 } 1152 1153 1154 void GraphBuilder::increment() { 1155 int index = stream()->get_index(); 1156 int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]); 1157 load_local(intType, index); 1158 ipush(append(new Constant(new IntConstant(delta)))); 1159 arithmetic_op(intType, Bytecodes::_iadd); 1160 store_local(intType, index); 1161 } 1162 1163 1164 void GraphBuilder::_goto(int from_bci, int to_bci) { 1165 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci); 1166 if (is_profiling()) { 1167 compilation()->set_would_profile(true); 1168 x->set_profiled_bci(bci()); 1169 if (profile_branches()) { 1170 x->set_profiled_method(method()); 1171 x->set_should_profile(true); 1172 } 1173 } 1174 append(x); 1175 } 1176 1177 1178 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) { 1179 BlockBegin* tsux = block_at(stream()->get_dest()); 1180 BlockBegin* fsux = block_at(stream()->next_bci()); 1181 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci(); 1182 Instruction *i = append(new If(x, cond, false, y, tsux, fsux, is_bb ? state_before : NULL, is_bb)); 1183 1184 if (is_profiling()) { 1185 If* if_node = i->as_If(); 1186 if (if_node != NULL) { 1187 // Note that we'd collect profile data in this method if we wanted it. 1188 compilation()->set_would_profile(true); 1189 // At level 2 we need the proper bci to count backedges 1190 if_node->set_profiled_bci(bci()); 1191 if (profile_branches()) { 1192 // Successors can be rotated by the canonicalizer, check for this case. 1193 if_node->set_profiled_method(method()); 1194 if_node->set_should_profile(true); 1195 if (if_node->tsux() == fsux) { 1196 if_node->set_swapped(true); 1197 } 1198 } 1199 return; 1200 } 1201 1202 // Check if this If was reduced to Goto. 1203 Goto *goto_node = i->as_Goto(); 1204 if (goto_node != NULL) { 1205 compilation()->set_would_profile(true); 1206 goto_node->set_profiled_bci(bci()); 1207 if (profile_branches()) { 1208 goto_node->set_profiled_method(method()); 1209 goto_node->set_should_profile(true); 1210 // Find out which successor is used. 1211 if (goto_node->default_sux() == tsux) { 1212 goto_node->set_direction(Goto::taken); 1213 } else if (goto_node->default_sux() == fsux) { 1214 goto_node->set_direction(Goto::not_taken); 1215 } else { 1216 ShouldNotReachHere(); 1217 } 1218 } 1219 return; 1220 } 1221 } 1222 } 1223 1224 1225 void GraphBuilder::if_zero(ValueType* type, If::Condition cond) { 1226 Value y = append(new Constant(intZero)); 1227 ValueStack* state_before = copy_state_before(); 1228 Value x = ipop(); 1229 if_node(x, cond, y, state_before); 1230 } 1231 1232 1233 void GraphBuilder::if_null(ValueType* type, If::Condition cond) { 1234 Value y = append(new Constant(objectNull)); 1235 ValueStack* state_before = copy_state_before(); 1236 Value x = apop(); 1237 if_node(x, cond, y, state_before); 1238 } 1239 1240 1241 void GraphBuilder::if_same(ValueType* type, If::Condition cond) { 1242 ValueStack* state_before = copy_state_before(); 1243 Value y = pop(type); 1244 Value x = pop(type); 1245 if_node(x, cond, y, state_before); 1246 } 1247 1248 1249 void GraphBuilder::jsr(int dest) { 1250 // We only handle well-formed jsrs (those which are "block-structured"). 1251 // If the bytecodes are strange (jumping out of a jsr block) then we 1252 // might end up trying to re-parse a block containing a jsr which 1253 // has already been activated. Watch for this case and bail out. 1254 for (ScopeData* cur_scope_data = scope_data(); 1255 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope(); 1256 cur_scope_data = cur_scope_data->parent()) { 1257 if (cur_scope_data->jsr_entry_bci() == dest) { 1258 BAILOUT("too-complicated jsr/ret structure"); 1259 } 1260 } 1261 1262 push(addressType, append(new Constant(new AddressConstant(next_bci())))); 1263 if (!try_inline_jsr(dest)) { 1264 return; // bailed out while parsing and inlining subroutine 1265 } 1266 } 1267 1268 1269 void GraphBuilder::ret(int local_index) { 1270 if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine"); 1271 1272 if (local_index != scope_data()->jsr_return_address_local()) { 1273 BAILOUT("can not handle complicated jsr/ret constructs"); 1274 } 1275 1276 // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation 1277 append(new Goto(scope_data()->jsr_continuation(), false)); 1278 } 1279 1280 1281 void GraphBuilder::table_switch() { 1282 Bytecode_tableswitch sw(stream()); 1283 const int l = sw.length(); 1284 if (CanonicalizeNodes && l == 1) { 1285 // total of 2 successors => use If instead of switch 1286 // Note: This code should go into the canonicalizer as soon as it can 1287 // can handle canonicalized forms that contain more than one node. 1288 Value key = append(new Constant(new IntConstant(sw.low_key()))); 1289 BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0)); 1290 BlockBegin* fsux = block_at(bci() + sw.default_offset()); 1291 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci(); 1292 ValueStack* state_before = is_bb ? copy_state_before() : NULL; 1293 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb)); 1294 } else { 1295 // collect successors 1296 BlockList* sux = new BlockList(l + 1, NULL); 1297 int i; 1298 bool has_bb = false; 1299 for (i = 0; i < l; i++) { 1300 sux->at_put(i, block_at(bci() + sw.dest_offset_at(i))); 1301 if (sw.dest_offset_at(i) < 0) has_bb = true; 1302 } 1303 // add default successor 1304 sux->at_put(i, block_at(bci() + sw.default_offset())); 1305 ValueStack* state_before = has_bb ? copy_state_before() : NULL; 1306 append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb)); 1307 } 1308 } 1309 1310 1311 void GraphBuilder::lookup_switch() { 1312 Bytecode_lookupswitch sw(stream()); 1313 const int l = sw.number_of_pairs(); 1314 if (CanonicalizeNodes && l == 1) { 1315 // total of 2 successors => use If instead of switch 1316 // Note: This code should go into the canonicalizer as soon as it can 1317 // can handle canonicalized forms that contain more than one node. 1318 // simplify to If 1319 LookupswitchPair pair = sw.pair_at(0); 1320 Value key = append(new Constant(new IntConstant(pair.match()))); 1321 BlockBegin* tsux = block_at(bci() + pair.offset()); 1322 BlockBegin* fsux = block_at(bci() + sw.default_offset()); 1323 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci(); 1324 ValueStack* state_before = is_bb ? copy_state_before() : NULL; 1325 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb)); 1326 } else { 1327 // collect successors & keys 1328 BlockList* sux = new BlockList(l + 1, NULL); 1329 intArray* keys = new intArray(l, 0); 1330 int i; 1331 bool has_bb = false; 1332 for (i = 0; i < l; i++) { 1333 LookupswitchPair pair = sw.pair_at(i); 1334 if (pair.offset() < 0) has_bb = true; 1335 sux->at_put(i, block_at(bci() + pair.offset())); 1336 keys->at_put(i, pair.match()); 1337 } 1338 // add default successor 1339 sux->at_put(i, block_at(bci() + sw.default_offset())); 1340 ValueStack* state_before = has_bb ? copy_state_before() : NULL; 1341 append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb)); 1342 } 1343 } 1344 1345 void GraphBuilder::call_register_finalizer() { 1346 // If the receiver requires finalization then emit code to perform 1347 // the registration on return. 1348 1349 // Gather some type information about the receiver 1350 Value receiver = state()->local_at(0); 1351 assert(receiver != NULL, "must have a receiver"); 1352 ciType* declared_type = receiver->declared_type(); 1353 ciType* exact_type = receiver->exact_type(); 1354 if (exact_type == NULL && 1355 receiver->as_Local() && 1356 receiver->as_Local()->java_index() == 0) { 1357 ciInstanceKlass* ik = compilation()->method()->holder(); 1358 if (ik->is_final()) { 1359 exact_type = ik; 1360 } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) { 1361 // test class is leaf class 1362 compilation()->dependency_recorder()->assert_leaf_type(ik); 1363 exact_type = ik; 1364 } else { 1365 declared_type = ik; 1366 } 1367 } 1368 1369 // see if we know statically that registration isn't required 1370 bool needs_check = true; 1371 if (exact_type != NULL) { 1372 needs_check = exact_type->as_instance_klass()->has_finalizer(); 1373 } else if (declared_type != NULL) { 1374 ciInstanceKlass* ik = declared_type->as_instance_klass(); 1375 if (!Dependencies::has_finalizable_subclass(ik)) { 1376 compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik); 1377 needs_check = false; 1378 } 1379 } 1380 1381 if (needs_check) { 1382 // Perform the registration of finalizable objects. 1383 ValueStack* state_before = copy_state_for_exception(); 1384 load_local(objectType, 0); 1385 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init, 1386 state()->pop_arguments(1), 1387 true, state_before, true)); 1388 } 1389 } 1390 1391 1392 void GraphBuilder::method_return(Value x) { 1393 if (RegisterFinalizersAtInit && 1394 method()->intrinsic_id() == vmIntrinsics::_Object_init) { 1395 call_register_finalizer(); 1396 } 1397 1398 bool need_mem_bar = false; 1399 if (method()->name() == ciSymbol::object_initializer_name() && 1400 scope()->wrote_final()) { 1401 need_mem_bar = true; 1402 } 1403 1404 // Check to see whether we are inlining. If so, Return 1405 // instructions become Gotos to the continuation point. 1406 if (continuation() != NULL) { 1407 assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet"); 1408 1409 if (compilation()->env()->dtrace_method_probes()) { 1410 // Report exit from inline methods 1411 Values* args = new Values(1); 1412 args->push(append(new Constant(new ObjectConstant(method())))); 1413 append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args)); 1414 } 1415 1416 // If the inlined method is synchronized, the monitor must be 1417 // released before we jump to the continuation block. 1418 if (method()->is_synchronized()) { 1419 assert(state()->locks_size() == 1, "receiver must be locked here"); 1420 monitorexit(state()->lock_at(0), SynchronizationEntryBCI); 1421 } 1422 1423 if (need_mem_bar) { 1424 append(new MemBar(lir_membar_storestore)); 1425 } 1426 1427 // State at end of inlined method is the state of the caller 1428 // without the method parameters on stack, including the 1429 // return value, if any, of the inlined method on operand stack. 1430 set_state(state()->caller_state()->copy_for_parsing()); 1431 if (x != NULL) { 1432 state()->push(x->type(), x); 1433 } 1434 Goto* goto_callee = new Goto(continuation(), false); 1435 1436 // See whether this is the first return; if so, store off some 1437 // of the state for later examination 1438 if (num_returns() == 0) { 1439 set_inline_cleanup_info(); 1440 } 1441 1442 // The current bci() is in the wrong scope, so use the bci() of 1443 // the continuation point. 1444 append_with_bci(goto_callee, scope_data()->continuation()->bci()); 1445 incr_num_returns(); 1446 return; 1447 } 1448 1449 state()->truncate_stack(0); 1450 if (method()->is_synchronized()) { 1451 // perform the unlocking before exiting the method 1452 Value receiver; 1453 if (!method()->is_static()) { 1454 receiver = _initial_state->local_at(0); 1455 } else { 1456 receiver = append(new Constant(new ClassConstant(method()->holder()))); 1457 } 1458 append_split(new MonitorExit(receiver, state()->unlock())); 1459 } 1460 1461 if (need_mem_bar) { 1462 append(new MemBar(lir_membar_storestore)); 1463 } 1464 1465 append(new Return(x)); 1466 } 1467 1468 1469 void GraphBuilder::access_field(Bytecodes::Code code) { 1470 bool will_link; 1471 ciField* field = stream()->get_field(will_link); 1472 ciInstanceKlass* holder = field->holder(); 1473 BasicType field_type = field->type()->basic_type(); 1474 ValueType* type = as_ValueType(field_type); 1475 // call will_link again to determine if the field is valid. 1476 const bool needs_patching = !holder->is_loaded() || 1477 !field->will_link(method()->holder(), code) || 1478 PatchALot; 1479 1480 ValueStack* state_before = NULL; 1481 if (!holder->is_initialized() || needs_patching) { 1482 // save state before instruction for debug info when 1483 // deoptimization happens during patching 1484 state_before = copy_state_before(); 1485 } 1486 1487 Value obj = NULL; 1488 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) { 1489 if (state_before != NULL) { 1490 // build a patching constant 1491 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before); 1492 } else { 1493 obj = new Constant(new InstanceConstant(holder->java_mirror())); 1494 } 1495 } 1496 1497 if (field->is_final() && (code == Bytecodes::_putfield)) { 1498 scope()->set_wrote_final(); 1499 } 1500 1501 const int offset = !needs_patching ? field->offset() : -1; 1502 switch (code) { 1503 case Bytecodes::_getstatic: { 1504 // check for compile-time constants, i.e., initialized static final fields 1505 Instruction* constant = NULL; 1506 if (field->is_constant() && !PatchALot) { 1507 ciConstant field_val = field->constant_value(); 1508 BasicType field_type = field_val.basic_type(); 1509 switch (field_type) { 1510 case T_ARRAY: 1511 case T_OBJECT: 1512 if (field_val.as_object()->should_be_constant()) { 1513 constant = new Constant(as_ValueType(field_val)); 1514 } 1515 break; 1516 1517 default: 1518 constant = new Constant(as_ValueType(field_val)); 1519 } 1520 } 1521 if (constant != NULL) { 1522 push(type, append(constant)); 1523 } else { 1524 if (state_before == NULL) { 1525 state_before = copy_state_for_exception(); 1526 } 1527 push(type, append(new LoadField(append(obj), offset, field, true, 1528 state_before, needs_patching))); 1529 } 1530 break; 1531 } 1532 case Bytecodes::_putstatic: 1533 { Value val = pop(type); 1534 if (state_before == NULL) { 1535 state_before = copy_state_for_exception(); 1536 } 1537 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching)); 1538 } 1539 break; 1540 case Bytecodes::_getfield : 1541 { 1542 if (state_before == NULL) { 1543 state_before = copy_state_for_exception(); 1544 } 1545 LoadField* load = new LoadField(apop(), offset, field, false, state_before, needs_patching); 1546 Value replacement = !needs_patching ? _memory->load(load) : load; 1547 if (replacement != load) { 1548 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked"); 1549 push(type, replacement); 1550 } else { 1551 push(type, append(load)); 1552 } 1553 break; 1554 } 1555 1556 case Bytecodes::_putfield : 1557 { Value val = pop(type); 1558 if (state_before == NULL) { 1559 state_before = copy_state_for_exception(); 1560 } 1561 StoreField* store = new StoreField(apop(), offset, field, val, false, state_before, needs_patching); 1562 if (!needs_patching) store = _memory->store(store); 1563 if (store != NULL) { 1564 append(store); 1565 } 1566 } 1567 break; 1568 default : 1569 ShouldNotReachHere(); 1570 break; 1571 } 1572 } 1573 1574 1575 Dependencies* GraphBuilder::dependency_recorder() const { 1576 assert(DeoptC1, "need debug information"); 1577 return compilation()->dependency_recorder(); 1578 } 1579 1580 1581 void GraphBuilder::invoke(Bytecodes::Code code) { 1582 bool will_link; 1583 ciMethod* target = stream()->get_method(will_link); 1584 // we have to make sure the argument size (incl. the receiver) 1585 // is correct for compilation (the call would fail later during 1586 // linkage anyway) - was bug (gri 7/28/99) 1587 if (target->is_loaded() && target->is_static() != (code == Bytecodes::_invokestatic)) BAILOUT("will cause link error"); 1588 ciInstanceKlass* klass = target->holder(); 1589 1590 // check if CHA possible: if so, change the code to invoke_special 1591 ciInstanceKlass* calling_klass = method()->holder(); 1592 ciKlass* holder = stream()->get_declared_method_holder(); 1593 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); 1594 ciInstanceKlass* actual_recv = callee_holder; 1595 1596 // some methods are obviously bindable without any type checks so 1597 // convert them directly to an invokespecial. 1598 if (target->is_loaded() && !target->is_abstract() && 1599 target->can_be_statically_bound() && code == Bytecodes::_invokevirtual) { 1600 code = Bytecodes::_invokespecial; 1601 } 1602 1603 bool is_invokedynamic = code == Bytecodes::_invokedynamic; 1604 1605 // NEEDS_CLEANUP 1606 // I've added the target-is_loaded() test below but I don't really understand 1607 // how klass->is_loaded() can be true and yet target->is_loaded() is false. 1608 // this happened while running the JCK invokevirtual tests under doit. TKR 1609 ciMethod* cha_monomorphic_target = NULL; 1610 ciMethod* exact_target = NULL; 1611 Value better_receiver = NULL; 1612 if (UseCHA && DeoptC1 && klass->is_loaded() && target->is_loaded() && 1613 !target->is_method_handle_invoke()) { 1614 Value receiver = NULL; 1615 ciInstanceKlass* receiver_klass = NULL; 1616 bool type_is_exact = false; 1617 // try to find a precise receiver type 1618 if (will_link && !target->is_static()) { 1619 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1); 1620 receiver = state()->stack_at(index); 1621 ciType* type = receiver->exact_type(); 1622 if (type != NULL && type->is_loaded() && 1623 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) { 1624 receiver_klass = (ciInstanceKlass*) type; 1625 type_is_exact = true; 1626 } 1627 if (type == NULL) { 1628 type = receiver->declared_type(); 1629 if (type != NULL && type->is_loaded() && 1630 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) { 1631 receiver_klass = (ciInstanceKlass*) type; 1632 if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) { 1633 // Insert a dependency on this type since 1634 // find_monomorphic_target may assume it's already done. 1635 dependency_recorder()->assert_leaf_type(receiver_klass); 1636 type_is_exact = true; 1637 } 1638 } 1639 } 1640 } 1641 if (receiver_klass != NULL && type_is_exact && 1642 receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) { 1643 // If we have the exact receiver type we can bind directly to 1644 // the method to call. 1645 exact_target = target->resolve_invoke(calling_klass, receiver_klass); 1646 if (exact_target != NULL) { 1647 target = exact_target; 1648 code = Bytecodes::_invokespecial; 1649 } 1650 } 1651 if (receiver_klass != NULL && 1652 receiver_klass->is_subtype_of(actual_recv) && 1653 actual_recv->is_initialized()) { 1654 actual_recv = receiver_klass; 1655 } 1656 1657 if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) || 1658 (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) { 1659 // Use CHA on the receiver to select a more precise method. 1660 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); 1661 } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != NULL) { 1662 // if there is only one implementor of this interface then we 1663 // may be able bind this invoke directly to the implementing 1664 // klass but we need both a dependence on the single interface 1665 // and on the method we bind to. Additionally since all we know 1666 // about the receiver type is the it's supposed to implement the 1667 // interface we have to insert a check that it's the class we 1668 // expect. Interface types are not checked by the verifier so 1669 // they are roughly equivalent to Object. 1670 ciInstanceKlass* singleton = NULL; 1671 if (target->holder()->nof_implementors() == 1) { 1672 singleton = target->holder()->implementor(0); 1673 1674 assert(holder->is_interface(), "invokeinterface to non interface?"); 1675 ciInstanceKlass* decl_interface = (ciInstanceKlass*)holder; 1676 // the number of implementors for decl_interface is less or 1677 // equal to the number of implementors for target->holder() so 1678 // if number of implementors of target->holder() == 1 then 1679 // number of implementors for decl_interface is 0 or 1. If 1680 // it's 0 then no class implements decl_interface and there's 1681 // no point in inlining. 1682 if (!holder->is_loaded() || decl_interface->nof_implementors() != 1) { 1683 singleton = NULL; 1684 } 1685 } 1686 if (singleton) { 1687 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, target->holder(), singleton); 1688 if (cha_monomorphic_target != NULL) { 1689 // If CHA is able to bind this invoke then update the class 1690 // to match that class, otherwise klass will refer to the 1691 // interface. 1692 klass = cha_monomorphic_target->holder(); 1693 actual_recv = target->holder(); 1694 1695 // insert a check it's really the expected class. 1696 CheckCast* c = new CheckCast(klass, receiver, copy_state_for_exception()); 1697 c->set_incompatible_class_change_check(); 1698 c->set_direct_compare(klass->is_final()); 1699 // pass the result of the checkcast so that the compiler has 1700 // more accurate type info in the inlinee 1701 better_receiver = append_split(c); 1702 } 1703 } 1704 } 1705 } 1706 1707 if (cha_monomorphic_target != NULL) { 1708 if (cha_monomorphic_target->is_abstract()) { 1709 // Do not optimize for abstract methods 1710 cha_monomorphic_target = NULL; 1711 } 1712 } 1713 1714 if (cha_monomorphic_target != NULL) { 1715 if (!(target->is_final_method())) { 1716 // If we inlined because CHA revealed only a single target method, 1717 // then we are dependent on that target method not getting overridden 1718 // by dynamic class loading. Be sure to test the "static" receiver 1719 // dest_method here, as opposed to the actual receiver, which may 1720 // falsely lead us to believe that the receiver is final or private. 1721 dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target); 1722 } 1723 code = Bytecodes::_invokespecial; 1724 } 1725 // check if we could do inlining 1726 if (!PatchALot && Inline && klass->is_loaded() && 1727 (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) 1728 && target->will_link(klass, callee_holder, code)) { 1729 // callee is known => check if we have static binding 1730 assert(target->is_loaded(), "callee must be known"); 1731 if (code == Bytecodes::_invokestatic || 1732 code == Bytecodes::_invokespecial || 1733 code == Bytecodes::_invokevirtual && target->is_final_method() || 1734 code == Bytecodes::_invokedynamic) { 1735 ciMethod* inline_target = (cha_monomorphic_target != NULL) ? cha_monomorphic_target : target; 1736 bool success = false; 1737 if (target->is_method_handle_invoke()) { 1738 // method handle invokes 1739 success = !is_invokedynamic ? for_method_handle_inline(target) : for_invokedynamic_inline(target); 1740 } 1741 if (!success) { 1742 // static binding => check if callee is ok 1743 success = try_inline(inline_target, (cha_monomorphic_target != NULL) || (exact_target != NULL), better_receiver); 1744 } 1745 CHECK_BAILOUT(); 1746 1747 #ifndef PRODUCT 1748 // printing 1749 if (PrintInlining && !success) { 1750 // if it was successfully inlined, then it was already printed. 1751 print_inline_result(inline_target, success); 1752 } 1753 #endif 1754 clear_inline_bailout(); 1755 if (success) { 1756 // Register dependence if JVMTI has either breakpoint 1757 // setting or hotswapping of methods capabilities since they may 1758 // cause deoptimization. 1759 if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) { 1760 dependency_recorder()->assert_evol_method(inline_target); 1761 } 1762 return; 1763 } 1764 } 1765 } 1766 // If we attempted an inline which did not succeed because of a 1767 // bailout during construction of the callee graph, the entire 1768 // compilation has to be aborted. This is fairly rare and currently 1769 // seems to only occur for jasm-generated classes which contain 1770 // jsr/ret pairs which are not associated with finally clauses and 1771 // do not have exception handlers in the containing method, and are 1772 // therefore not caught early enough to abort the inlining without 1773 // corrupting the graph. (We currently bail out with a non-empty 1774 // stack at a ret in these situations.) 1775 CHECK_BAILOUT(); 1776 1777 // inlining not successful => standard invoke 1778 bool is_loaded = target->is_loaded(); 1779 bool has_receiver = 1780 code == Bytecodes::_invokespecial || 1781 code == Bytecodes::_invokevirtual || 1782 code == Bytecodes::_invokeinterface; 1783 ValueType* result_type = as_ValueType(target->return_type()); 1784 1785 // We require the debug info to be the "state before" because 1786 // invokedynamics may deoptimize. 1787 ValueStack* state_before = is_invokedynamic ? copy_state_before() : copy_state_exhandling(); 1788 1789 Values* args = state()->pop_arguments(target->arg_size_no_receiver()); 1790 Value recv = has_receiver ? apop() : NULL; 1791 int vtable_index = methodOopDesc::invalid_vtable_index; 1792 1793 #ifdef SPARC 1794 // Currently only supported on Sparc. 1795 // The UseInlineCaches only controls dispatch to invokevirtuals for 1796 // loaded classes which we weren't able to statically bind. 1797 if (!UseInlineCaches && is_loaded && code == Bytecodes::_invokevirtual 1798 && !target->can_be_statically_bound()) { 1799 // Find a vtable index if one is available 1800 vtable_index = target->resolve_vtable_index(calling_klass, callee_holder); 1801 } 1802 #endif 1803 1804 if (recv != NULL && 1805 (code == Bytecodes::_invokespecial || 1806 !is_loaded || target->is_final())) { 1807 // invokespecial always needs a NULL check. invokevirtual where 1808 // the target is final or where it's not known that whether the 1809 // target is final requires a NULL check. Otherwise normal 1810 // invokevirtual will perform the null check during the lookup 1811 // logic or the unverified entry point. Profiling of calls 1812 // requires that the null check is performed in all cases. 1813 null_check(recv); 1814 } 1815 1816 if (is_profiling()) { 1817 if (recv != NULL && profile_calls()) { 1818 null_check(recv); 1819 } 1820 // Note that we'd collect profile data in this method if we wanted it. 1821 compilation()->set_would_profile(true); 1822 1823 if (profile_calls()) { 1824 assert(cha_monomorphic_target == NULL || exact_target == NULL, "both can not be set"); 1825 ciKlass* target_klass = NULL; 1826 if (cha_monomorphic_target != NULL) { 1827 target_klass = cha_monomorphic_target->holder(); 1828 } else if (exact_target != NULL) { 1829 target_klass = exact_target->holder(); 1830 } 1831 profile_call(recv, target_klass); 1832 } 1833 } 1834 1835 Invoke* result = new Invoke(code, result_type, recv, args, vtable_index, target, state_before); 1836 // push result 1837 append_split(result); 1838 1839 if (result_type != voidType) { 1840 if (method()->is_strict()) { 1841 push(result_type, round_fp(result)); 1842 } else { 1843 push(result_type, result); 1844 } 1845 } 1846 } 1847 1848 1849 void GraphBuilder::new_instance(int klass_index) { 1850 ValueStack* state_before = copy_state_exhandling(); 1851 bool will_link; 1852 ciKlass* klass = stream()->get_klass(will_link); 1853 assert(klass->is_instance_klass(), "must be an instance klass"); 1854 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before); 1855 _memory->new_instance(new_instance); 1856 apush(append_split(new_instance)); 1857 } 1858 1859 1860 void GraphBuilder::new_type_array() { 1861 ValueStack* state_before = copy_state_exhandling(); 1862 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before))); 1863 } 1864 1865 1866 void GraphBuilder::new_object_array() { 1867 bool will_link; 1868 ciKlass* klass = stream()->get_klass(will_link); 1869 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 1870 NewArray* n = new NewObjectArray(klass, ipop(), state_before); 1871 apush(append_split(n)); 1872 } 1873 1874 1875 bool GraphBuilder::direct_compare(ciKlass* k) { 1876 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) { 1877 ciInstanceKlass* ik = k->as_instance_klass(); 1878 if (ik->is_final()) { 1879 return true; 1880 } else { 1881 if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) { 1882 // test class is leaf class 1883 dependency_recorder()->assert_leaf_type(ik); 1884 return true; 1885 } 1886 } 1887 } 1888 return false; 1889 } 1890 1891 1892 void GraphBuilder::check_cast(int klass_index) { 1893 bool will_link; 1894 ciKlass* klass = stream()->get_klass(will_link); 1895 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception(); 1896 CheckCast* c = new CheckCast(klass, apop(), state_before); 1897 apush(append_split(c)); 1898 c->set_direct_compare(direct_compare(klass)); 1899 1900 if (is_profiling()) { 1901 // Note that we'd collect profile data in this method if we wanted it. 1902 compilation()->set_would_profile(true); 1903 1904 if (profile_checkcasts()) { 1905 c->set_profiled_method(method()); 1906 c->set_profiled_bci(bci()); 1907 c->set_should_profile(true); 1908 } 1909 } 1910 } 1911 1912 1913 void GraphBuilder::instance_of(int klass_index) { 1914 bool will_link; 1915 ciKlass* klass = stream()->get_klass(will_link); 1916 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 1917 InstanceOf* i = new InstanceOf(klass, apop(), state_before); 1918 ipush(append_split(i)); 1919 i->set_direct_compare(direct_compare(klass)); 1920 1921 if (is_profiling()) { 1922 // Note that we'd collect profile data in this method if we wanted it. 1923 compilation()->set_would_profile(true); 1924 1925 if (profile_checkcasts()) { 1926 i->set_profiled_method(method()); 1927 i->set_profiled_bci(bci()); 1928 i->set_should_profile(true); 1929 } 1930 } 1931 } 1932 1933 1934 void GraphBuilder::monitorenter(Value x, int bci) { 1935 // save state before locking in case of deoptimization after a NullPointerException 1936 ValueStack* state_before = copy_state_for_exception_with_bci(bci); 1937 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before), bci); 1938 kill_all(); 1939 } 1940 1941 1942 void GraphBuilder::monitorexit(Value x, int bci) { 1943 append_with_bci(new MonitorExit(x, state()->unlock()), bci); 1944 kill_all(); 1945 } 1946 1947 1948 void GraphBuilder::new_multi_array(int dimensions) { 1949 bool will_link; 1950 ciKlass* klass = stream()->get_klass(will_link); 1951 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 1952 1953 Values* dims = new Values(dimensions, NULL); 1954 // fill in all dimensions 1955 int i = dimensions; 1956 while (i-- > 0) dims->at_put(i, ipop()); 1957 // create array 1958 NewArray* n = new NewMultiArray(klass, dims, state_before); 1959 apush(append_split(n)); 1960 } 1961 1962 1963 void GraphBuilder::throw_op(int bci) { 1964 // We require that the debug info for a Throw be the "state before" 1965 // the Throw (i.e., exception oop is still on TOS) 1966 ValueStack* state_before = copy_state_before_with_bci(bci); 1967 Throw* t = new Throw(apop(), state_before); 1968 // operand stack not needed after a throw 1969 state()->truncate_stack(0); 1970 append_with_bci(t, bci); 1971 } 1972 1973 1974 Value GraphBuilder::round_fp(Value fp_value) { 1975 // no rounding needed if SSE2 is used 1976 if (RoundFPResults && UseSSE < 2) { 1977 // Must currently insert rounding node for doubleword values that 1978 // are results of expressions (i.e., not loads from memory or 1979 // constants) 1980 if (fp_value->type()->tag() == doubleTag && 1981 fp_value->as_Constant() == NULL && 1982 fp_value->as_Local() == NULL && // method parameters need no rounding 1983 fp_value->as_RoundFP() == NULL) { 1984 return append(new RoundFP(fp_value)); 1985 } 1986 } 1987 return fp_value; 1988 } 1989 1990 1991 Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) { 1992 Canonicalizer canon(compilation(), instr, bci); 1993 Instruction* i1 = canon.canonical(); 1994 if (i1->is_linked() || !i1->can_be_linked()) { 1995 // Canonicalizer returned an instruction which was already 1996 // appended so simply return it. 1997 return i1; 1998 } 1999 2000 if (UseLocalValueNumbering) { 2001 // Lookup the instruction in the ValueMap and add it to the map if 2002 // it's not found. 2003 Instruction* i2 = vmap()->find_insert(i1); 2004 if (i2 != i1) { 2005 // found an entry in the value map, so just return it. 2006 assert(i2->is_linked(), "should already be linked"); 2007 return i2; 2008 } 2009 ValueNumberingEffects vne(vmap()); 2010 i1->visit(&vne); 2011 } 2012 2013 // i1 was not eliminated => append it 2014 assert(i1->next() == NULL, "shouldn't already be linked"); 2015 _last = _last->set_next(i1, canon.bci()); 2016 2017 if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) { 2018 // set the bailout state but complete normal processing. We 2019 // might do a little more work before noticing the bailout so we 2020 // want processing to continue normally until it's noticed. 2021 bailout("Method and/or inlining is too large"); 2022 } 2023 2024 #ifndef PRODUCT 2025 if (PrintIRDuringConstruction) { 2026 InstructionPrinter ip; 2027 ip.print_line(i1); 2028 if (Verbose) { 2029 state()->print(); 2030 } 2031 } 2032 #endif 2033 2034 // save state after modification of operand stack for StateSplit instructions 2035 StateSplit* s = i1->as_StateSplit(); 2036 if (s != NULL) { 2037 if (EliminateFieldAccess) { 2038 Intrinsic* intrinsic = s->as_Intrinsic(); 2039 if (s->as_Invoke() != NULL || (intrinsic && !intrinsic->preserves_state())) { 2040 _memory->kill(); 2041 } 2042 } 2043 s->set_state(state()->copy(ValueStack::StateAfter, canon.bci())); 2044 } 2045 2046 // set up exception handlers for this instruction if necessary 2047 if (i1->can_trap()) { 2048 i1->set_exception_handlers(handle_exception(i1)); 2049 assert(i1->exception_state() != NULL || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state"); 2050 } 2051 return i1; 2052 } 2053 2054 2055 Instruction* GraphBuilder::append(Instruction* instr) { 2056 assert(instr->as_StateSplit() == NULL || instr->as_BlockEnd() != NULL, "wrong append used"); 2057 return append_with_bci(instr, bci()); 2058 } 2059 2060 2061 Instruction* GraphBuilder::append_split(StateSplit* instr) { 2062 return append_with_bci(instr, bci()); 2063 } 2064 2065 2066 void GraphBuilder::null_check(Value value) { 2067 if (value->as_NewArray() != NULL || value->as_NewInstance() != NULL) { 2068 return; 2069 } else { 2070 Constant* con = value->as_Constant(); 2071 if (con) { 2072 ObjectType* c = con->type()->as_ObjectType(); 2073 if (c && c->is_loaded()) { 2074 ObjectConstant* oc = c->as_ObjectConstant(); 2075 if (!oc || !oc->value()->is_null_object()) { 2076 return; 2077 } 2078 } 2079 } 2080 } 2081 append(new NullCheck(value, copy_state_for_exception())); 2082 } 2083 2084 2085 2086 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) { 2087 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != NULL)) { 2088 assert(instruction->exception_state() == NULL 2089 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState 2090 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->jvmti_can_access_local_variables()), 2091 "exception_state should be of exception kind"); 2092 return new XHandlers(); 2093 } 2094 2095 XHandlers* exception_handlers = new XHandlers(); 2096 ScopeData* cur_scope_data = scope_data(); 2097 ValueStack* cur_state = instruction->state_before(); 2098 ValueStack* prev_state = NULL; 2099 int scope_count = 0; 2100 2101 assert(cur_state != NULL, "state_before must be set"); 2102 do { 2103 int cur_bci = cur_state->bci(); 2104 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match"); 2105 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci(), "invalid bci"); 2106 2107 // join with all potential exception handlers 2108 XHandlers* list = cur_scope_data->xhandlers(); 2109 const int n = list->length(); 2110 for (int i = 0; i < n; i++) { 2111 XHandler* h = list->handler_at(i); 2112 if (h->covers(cur_bci)) { 2113 // h is a potential exception handler => join it 2114 compilation()->set_has_exception_handlers(true); 2115 2116 BlockBegin* entry = h->entry_block(); 2117 if (entry == block()) { 2118 // It's acceptable for an exception handler to cover itself 2119 // but we don't handle that in the parser currently. It's 2120 // very rare so we bailout instead of trying to handle it. 2121 BAILOUT_("exception handler covers itself", exception_handlers); 2122 } 2123 assert(entry->bci() == h->handler_bci(), "must match"); 2124 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond"); 2125 2126 // previously this was a BAILOUT, but this is not necessary 2127 // now because asynchronous exceptions are not handled this way. 2128 assert(entry->state() == NULL || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match"); 2129 2130 // xhandler start with an empty expression stack 2131 if (cur_state->stack_size() != 0) { 2132 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci()); 2133 } 2134 if (instruction->exception_state() == NULL) { 2135 instruction->set_exception_state(cur_state); 2136 } 2137 2138 // Note: Usually this join must work. However, very 2139 // complicated jsr-ret structures where we don't ret from 2140 // the subroutine can cause the objects on the monitor 2141 // stacks to not match because blocks can be parsed twice. 2142 // The only test case we've seen so far which exhibits this 2143 // problem is caught by the infinite recursion test in 2144 // GraphBuilder::jsr() if the join doesn't work. 2145 if (!entry->try_merge(cur_state)) { 2146 BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers); 2147 } 2148 2149 // add current state for correct handling of phi functions at begin of xhandler 2150 int phi_operand = entry->add_exception_state(cur_state); 2151 2152 // add entry to the list of xhandlers of this block 2153 _block->add_exception_handler(entry); 2154 2155 // add back-edge from xhandler entry to this block 2156 if (!entry->is_predecessor(_block)) { 2157 entry->add_predecessor(_block); 2158 } 2159 2160 // clone XHandler because phi_operand and scope_count can not be shared 2161 XHandler* new_xhandler = new XHandler(h); 2162 new_xhandler->set_phi_operand(phi_operand); 2163 new_xhandler->set_scope_count(scope_count); 2164 exception_handlers->append(new_xhandler); 2165 2166 // fill in exception handler subgraph lazily 2167 assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet"); 2168 cur_scope_data->add_to_work_list(entry); 2169 2170 // stop when reaching catchall 2171 if (h->catch_type() == 0) { 2172 return exception_handlers; 2173 } 2174 } 2175 } 2176 2177 if (exception_handlers->length() == 0) { 2178 // This scope and all callees do not handle exceptions, so the local 2179 // variables of this scope are not needed. However, the scope itself is 2180 // required for a correct exception stack trace -> clear out the locals. 2181 if (_compilation->env()->jvmti_can_access_local_variables()) { 2182 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci()); 2183 } else { 2184 cur_state = cur_state->copy(ValueStack::EmptyExceptionState, cur_state->bci()); 2185 } 2186 if (prev_state != NULL) { 2187 prev_state->set_caller_state(cur_state); 2188 } 2189 if (instruction->exception_state() == NULL) { 2190 instruction->set_exception_state(cur_state); 2191 } 2192 } 2193 2194 // Set up iteration for next time. 2195 // If parsing a jsr, do not grab exception handlers from the 2196 // parent scopes for this method (already got them, and they 2197 // needed to be cloned) 2198 2199 while (cur_scope_data->parsing_jsr()) { 2200 cur_scope_data = cur_scope_data->parent(); 2201 } 2202 2203 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match"); 2204 assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler"); 2205 2206 prev_state = cur_state; 2207 cur_state = cur_state->caller_state(); 2208 cur_scope_data = cur_scope_data->parent(); 2209 scope_count++; 2210 } while (cur_scope_data != NULL); 2211 2212 return exception_handlers; 2213 } 2214 2215 2216 // Helper class for simplifying Phis. 2217 class PhiSimplifier : public BlockClosure { 2218 private: 2219 bool _has_substitutions; 2220 Value simplify(Value v); 2221 2222 public: 2223 PhiSimplifier(BlockBegin* start) : _has_substitutions(false) { 2224 start->iterate_preorder(this); 2225 if (_has_substitutions) { 2226 SubstitutionResolver sr(start); 2227 } 2228 } 2229 void block_do(BlockBegin* b); 2230 bool has_substitutions() const { return _has_substitutions; } 2231 }; 2232 2233 2234 Value PhiSimplifier::simplify(Value v) { 2235 Phi* phi = v->as_Phi(); 2236 2237 if (phi == NULL) { 2238 // no phi function 2239 return v; 2240 } else if (v->has_subst()) { 2241 // already substituted; subst can be phi itself -> simplify 2242 return simplify(v->subst()); 2243 } else if (phi->is_set(Phi::cannot_simplify)) { 2244 // already tried to simplify phi before 2245 return phi; 2246 } else if (phi->is_set(Phi::visited)) { 2247 // break cycles in phi functions 2248 return phi; 2249 } else if (phi->type()->is_illegal()) { 2250 // illegal phi functions are ignored anyway 2251 return phi; 2252 2253 } else { 2254 // mark phi function as processed to break cycles in phi functions 2255 phi->set(Phi::visited); 2256 2257 // simplify x = [y, x] and x = [y, y] to y 2258 Value subst = NULL; 2259 int opd_count = phi->operand_count(); 2260 for (int i = 0; i < opd_count; i++) { 2261 Value opd = phi->operand_at(i); 2262 assert(opd != NULL, "Operand must exist!"); 2263 2264 if (opd->type()->is_illegal()) { 2265 // if one operand is illegal, the entire phi function is illegal 2266 phi->make_illegal(); 2267 phi->clear(Phi::visited); 2268 return phi; 2269 } 2270 2271 Value new_opd = simplify(opd); 2272 assert(new_opd != NULL, "Simplified operand must exist!"); 2273 2274 if (new_opd != phi && new_opd != subst) { 2275 if (subst == NULL) { 2276 subst = new_opd; 2277 } else { 2278 // no simplification possible 2279 phi->set(Phi::cannot_simplify); 2280 phi->clear(Phi::visited); 2281 return phi; 2282 } 2283 } 2284 } 2285 2286 // sucessfully simplified phi function 2287 assert(subst != NULL, "illegal phi function"); 2288 _has_substitutions = true; 2289 phi->clear(Phi::visited); 2290 phi->set_subst(subst); 2291 2292 #ifndef PRODUCT 2293 if (PrintPhiFunctions) { 2294 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()); 2295 } 2296 #endif 2297 2298 return subst; 2299 } 2300 } 2301 2302 2303 void PhiSimplifier::block_do(BlockBegin* b) { 2304 for_each_phi_fun(b, phi, 2305 simplify(phi); 2306 ); 2307 2308 #ifdef ASSERT 2309 for_each_phi_fun(b, phi, 2310 assert(phi->operand_count() != 1 || phi->subst() != phi, "missed trivial simplification"); 2311 ); 2312 2313 ValueStack* state = b->state()->caller_state(); 2314 for_each_state_value(state, value, 2315 Phi* phi = value->as_Phi(); 2316 assert(phi == NULL || phi->block() != b, "must not have phi function to simplify in caller state"); 2317 ); 2318 #endif 2319 } 2320 2321 // This method is called after all blocks are filled with HIR instructions 2322 // It eliminates all Phi functions of the form x = [y, y] and x = [y, x] 2323 void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) { 2324 PhiSimplifier simplifier(start); 2325 } 2326 2327 2328 void GraphBuilder::connect_to_end(BlockBegin* beg) { 2329 // setup iteration 2330 kill_all(); 2331 _block = beg; 2332 _state = beg->state()->copy_for_parsing(); 2333 _last = beg; 2334 iterate_bytecodes_for_block(beg->bci()); 2335 } 2336 2337 2338 BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) { 2339 #ifndef PRODUCT 2340 if (PrintIRDuringConstruction) { 2341 tty->cr(); 2342 InstructionPrinter ip; 2343 ip.print_instr(_block); tty->cr(); 2344 ip.print_stack(_block->state()); tty->cr(); 2345 ip.print_inline_level(_block); 2346 ip.print_head(); 2347 tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size()); 2348 } 2349 #endif 2350 _skip_block = false; 2351 assert(state() != NULL, "ValueStack missing!"); 2352 ciBytecodeStream s(method()); 2353 s.reset_to_bci(bci); 2354 int prev_bci = bci; 2355 scope_data()->set_stream(&s); 2356 // iterate 2357 Bytecodes::Code code = Bytecodes::_illegal; 2358 bool push_exception = false; 2359 2360 if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == NULL) { 2361 // first thing in the exception entry block should be the exception object. 2362 push_exception = true; 2363 } 2364 2365 while (!bailed_out() && last()->as_BlockEnd() == NULL && 2366 (code = stream()->next()) != ciBytecodeStream::EOBC() && 2367 (block_at(s.cur_bci()) == NULL || block_at(s.cur_bci()) == block())) { 2368 assert(state()->kind() == ValueStack::Parsing, "invalid state kind"); 2369 2370 // Check for active jsr during OSR compilation 2371 if (compilation()->is_osr_compile() 2372 && scope()->is_top_scope() 2373 && parsing_jsr() 2374 && s.cur_bci() == compilation()->osr_bci()) { 2375 bailout("OSR not supported while a jsr is active"); 2376 } 2377 2378 if (push_exception) { 2379 apush(append(new ExceptionObject())); 2380 push_exception = false; 2381 } 2382 2383 // handle bytecode 2384 switch (code) { 2385 case Bytecodes::_nop : /* nothing to do */ break; 2386 case Bytecodes::_aconst_null : apush(append(new Constant(objectNull ))); break; 2387 case Bytecodes::_iconst_m1 : ipush(append(new Constant(new IntConstant (-1)))); break; 2388 case Bytecodes::_iconst_0 : ipush(append(new Constant(intZero ))); break; 2389 case Bytecodes::_iconst_1 : ipush(append(new Constant(intOne ))); break; 2390 case Bytecodes::_iconst_2 : ipush(append(new Constant(new IntConstant ( 2)))); break; 2391 case Bytecodes::_iconst_3 : ipush(append(new Constant(new IntConstant ( 3)))); break; 2392 case Bytecodes::_iconst_4 : ipush(append(new Constant(new IntConstant ( 4)))); break; 2393 case Bytecodes::_iconst_5 : ipush(append(new Constant(new IntConstant ( 5)))); break; 2394 case Bytecodes::_lconst_0 : lpush(append(new Constant(new LongConstant ( 0)))); break; 2395 case Bytecodes::_lconst_1 : lpush(append(new Constant(new LongConstant ( 1)))); break; 2396 case Bytecodes::_fconst_0 : fpush(append(new Constant(new FloatConstant ( 0)))); break; 2397 case Bytecodes::_fconst_1 : fpush(append(new Constant(new FloatConstant ( 1)))); break; 2398 case Bytecodes::_fconst_2 : fpush(append(new Constant(new FloatConstant ( 2)))); break; 2399 case Bytecodes::_dconst_0 : dpush(append(new Constant(new DoubleConstant( 0)))); break; 2400 case Bytecodes::_dconst_1 : dpush(append(new Constant(new DoubleConstant( 1)))); break; 2401 case Bytecodes::_bipush : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break; 2402 case Bytecodes::_sipush : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break; 2403 case Bytecodes::_ldc : // fall through 2404 case Bytecodes::_ldc_w : // fall through 2405 case Bytecodes::_ldc2_w : load_constant(); break; 2406 case Bytecodes::_iload : load_local(intType , s.get_index()); break; 2407 case Bytecodes::_lload : load_local(longType , s.get_index()); break; 2408 case Bytecodes::_fload : load_local(floatType , s.get_index()); break; 2409 case Bytecodes::_dload : load_local(doubleType , s.get_index()); break; 2410 case Bytecodes::_aload : load_local(instanceType, s.get_index()); break; 2411 case Bytecodes::_iload_0 : load_local(intType , 0); break; 2412 case Bytecodes::_iload_1 : load_local(intType , 1); break; 2413 case Bytecodes::_iload_2 : load_local(intType , 2); break; 2414 case Bytecodes::_iload_3 : load_local(intType , 3); break; 2415 case Bytecodes::_lload_0 : load_local(longType , 0); break; 2416 case Bytecodes::_lload_1 : load_local(longType , 1); break; 2417 case Bytecodes::_lload_2 : load_local(longType , 2); break; 2418 case Bytecodes::_lload_3 : load_local(longType , 3); break; 2419 case Bytecodes::_fload_0 : load_local(floatType , 0); break; 2420 case Bytecodes::_fload_1 : load_local(floatType , 1); break; 2421 case Bytecodes::_fload_2 : load_local(floatType , 2); break; 2422 case Bytecodes::_fload_3 : load_local(floatType , 3); break; 2423 case Bytecodes::_dload_0 : load_local(doubleType, 0); break; 2424 case Bytecodes::_dload_1 : load_local(doubleType, 1); break; 2425 case Bytecodes::_dload_2 : load_local(doubleType, 2); break; 2426 case Bytecodes::_dload_3 : load_local(doubleType, 3); break; 2427 case Bytecodes::_aload_0 : load_local(objectType, 0); break; 2428 case Bytecodes::_aload_1 : load_local(objectType, 1); break; 2429 case Bytecodes::_aload_2 : load_local(objectType, 2); break; 2430 case Bytecodes::_aload_3 : load_local(objectType, 3); break; 2431 case Bytecodes::_iaload : load_indexed(T_INT ); break; 2432 case Bytecodes::_laload : load_indexed(T_LONG ); break; 2433 case Bytecodes::_faload : load_indexed(T_FLOAT ); break; 2434 case Bytecodes::_daload : load_indexed(T_DOUBLE); break; 2435 case Bytecodes::_aaload : load_indexed(T_OBJECT); break; 2436 case Bytecodes::_baload : load_indexed(T_BYTE ); break; 2437 case Bytecodes::_caload : load_indexed(T_CHAR ); break; 2438 case Bytecodes::_saload : load_indexed(T_SHORT ); break; 2439 case Bytecodes::_istore : store_local(intType , s.get_index()); break; 2440 case Bytecodes::_lstore : store_local(longType , s.get_index()); break; 2441 case Bytecodes::_fstore : store_local(floatType , s.get_index()); break; 2442 case Bytecodes::_dstore : store_local(doubleType, s.get_index()); break; 2443 case Bytecodes::_astore : store_local(objectType, s.get_index()); break; 2444 case Bytecodes::_istore_0 : store_local(intType , 0); break; 2445 case Bytecodes::_istore_1 : store_local(intType , 1); break; 2446 case Bytecodes::_istore_2 : store_local(intType , 2); break; 2447 case Bytecodes::_istore_3 : store_local(intType , 3); break; 2448 case Bytecodes::_lstore_0 : store_local(longType , 0); break; 2449 case Bytecodes::_lstore_1 : store_local(longType , 1); break; 2450 case Bytecodes::_lstore_2 : store_local(longType , 2); break; 2451 case Bytecodes::_lstore_3 : store_local(longType , 3); break; 2452 case Bytecodes::_fstore_0 : store_local(floatType , 0); break; 2453 case Bytecodes::_fstore_1 : store_local(floatType , 1); break; 2454 case Bytecodes::_fstore_2 : store_local(floatType , 2); break; 2455 case Bytecodes::_fstore_3 : store_local(floatType , 3); break; 2456 case Bytecodes::_dstore_0 : store_local(doubleType, 0); break; 2457 case Bytecodes::_dstore_1 : store_local(doubleType, 1); break; 2458 case Bytecodes::_dstore_2 : store_local(doubleType, 2); break; 2459 case Bytecodes::_dstore_3 : store_local(doubleType, 3); break; 2460 case Bytecodes::_astore_0 : store_local(objectType, 0); break; 2461 case Bytecodes::_astore_1 : store_local(objectType, 1); break; 2462 case Bytecodes::_astore_2 : store_local(objectType, 2); break; 2463 case Bytecodes::_astore_3 : store_local(objectType, 3); break; 2464 case Bytecodes::_iastore : store_indexed(T_INT ); break; 2465 case Bytecodes::_lastore : store_indexed(T_LONG ); break; 2466 case Bytecodes::_fastore : store_indexed(T_FLOAT ); break; 2467 case Bytecodes::_dastore : store_indexed(T_DOUBLE); break; 2468 case Bytecodes::_aastore : store_indexed(T_OBJECT); break; 2469 case Bytecodes::_bastore : store_indexed(T_BYTE ); break; 2470 case Bytecodes::_castore : store_indexed(T_CHAR ); break; 2471 case Bytecodes::_sastore : store_indexed(T_SHORT ); break; 2472 case Bytecodes::_pop : // fall through 2473 case Bytecodes::_pop2 : // fall through 2474 case Bytecodes::_dup : // fall through 2475 case Bytecodes::_dup_x1 : // fall through 2476 case Bytecodes::_dup_x2 : // fall through 2477 case Bytecodes::_dup2 : // fall through 2478 case Bytecodes::_dup2_x1 : // fall through 2479 case Bytecodes::_dup2_x2 : // fall through 2480 case Bytecodes::_swap : stack_op(code); break; 2481 case Bytecodes::_iadd : arithmetic_op(intType , code); break; 2482 case Bytecodes::_ladd : arithmetic_op(longType , code); break; 2483 case Bytecodes::_fadd : arithmetic_op(floatType , code); break; 2484 case Bytecodes::_dadd : arithmetic_op(doubleType, code); break; 2485 case Bytecodes::_isub : arithmetic_op(intType , code); break; 2486 case Bytecodes::_lsub : arithmetic_op(longType , code); break; 2487 case Bytecodes::_fsub : arithmetic_op(floatType , code); break; 2488 case Bytecodes::_dsub : arithmetic_op(doubleType, code); break; 2489 case Bytecodes::_imul : arithmetic_op(intType , code); break; 2490 case Bytecodes::_lmul : arithmetic_op(longType , code); break; 2491 case Bytecodes::_fmul : arithmetic_op(floatType , code); break; 2492 case Bytecodes::_dmul : arithmetic_op(doubleType, code); break; 2493 case Bytecodes::_idiv : arithmetic_op(intType , code, copy_state_for_exception()); break; 2494 case Bytecodes::_ldiv : arithmetic_op(longType , code, copy_state_for_exception()); break; 2495 case Bytecodes::_fdiv : arithmetic_op(floatType , code); break; 2496 case Bytecodes::_ddiv : arithmetic_op(doubleType, code); break; 2497 case Bytecodes::_irem : arithmetic_op(intType , code, copy_state_for_exception()); break; 2498 case Bytecodes::_lrem : arithmetic_op(longType , code, copy_state_for_exception()); break; 2499 case Bytecodes::_frem : arithmetic_op(floatType , code); break; 2500 case Bytecodes::_drem : arithmetic_op(doubleType, code); break; 2501 case Bytecodes::_ineg : negate_op(intType ); break; 2502 case Bytecodes::_lneg : negate_op(longType ); break; 2503 case Bytecodes::_fneg : negate_op(floatType ); break; 2504 case Bytecodes::_dneg : negate_op(doubleType); break; 2505 case Bytecodes::_ishl : shift_op(intType , code); break; 2506 case Bytecodes::_lshl : shift_op(longType, code); break; 2507 case Bytecodes::_ishr : shift_op(intType , code); break; 2508 case Bytecodes::_lshr : shift_op(longType, code); break; 2509 case Bytecodes::_iushr : shift_op(intType , code); break; 2510 case Bytecodes::_lushr : shift_op(longType, code); break; 2511 case Bytecodes::_iand : logic_op(intType , code); break; 2512 case Bytecodes::_land : logic_op(longType, code); break; 2513 case Bytecodes::_ior : logic_op(intType , code); break; 2514 case Bytecodes::_lor : logic_op(longType, code); break; 2515 case Bytecodes::_ixor : logic_op(intType , code); break; 2516 case Bytecodes::_lxor : logic_op(longType, code); break; 2517 case Bytecodes::_iinc : increment(); break; 2518 case Bytecodes::_i2l : convert(code, T_INT , T_LONG ); break; 2519 case Bytecodes::_i2f : convert(code, T_INT , T_FLOAT ); break; 2520 case Bytecodes::_i2d : convert(code, T_INT , T_DOUBLE); break; 2521 case Bytecodes::_l2i : convert(code, T_LONG , T_INT ); break; 2522 case Bytecodes::_l2f : convert(code, T_LONG , T_FLOAT ); break; 2523 case Bytecodes::_l2d : convert(code, T_LONG , T_DOUBLE); break; 2524 case Bytecodes::_f2i : convert(code, T_FLOAT , T_INT ); break; 2525 case Bytecodes::_f2l : convert(code, T_FLOAT , T_LONG ); break; 2526 case Bytecodes::_f2d : convert(code, T_FLOAT , T_DOUBLE); break; 2527 case Bytecodes::_d2i : convert(code, T_DOUBLE, T_INT ); break; 2528 case Bytecodes::_d2l : convert(code, T_DOUBLE, T_LONG ); break; 2529 case Bytecodes::_d2f : convert(code, T_DOUBLE, T_FLOAT ); break; 2530 case Bytecodes::_i2b : convert(code, T_INT , T_BYTE ); break; 2531 case Bytecodes::_i2c : convert(code, T_INT , T_CHAR ); break; 2532 case Bytecodes::_i2s : convert(code, T_INT , T_SHORT ); break; 2533 case Bytecodes::_lcmp : compare_op(longType , code); break; 2534 case Bytecodes::_fcmpl : compare_op(floatType , code); break; 2535 case Bytecodes::_fcmpg : compare_op(floatType , code); break; 2536 case Bytecodes::_dcmpl : compare_op(doubleType, code); break; 2537 case Bytecodes::_dcmpg : compare_op(doubleType, code); break; 2538 case Bytecodes::_ifeq : if_zero(intType , If::eql); break; 2539 case Bytecodes::_ifne : if_zero(intType , If::neq); break; 2540 case Bytecodes::_iflt : if_zero(intType , If::lss); break; 2541 case Bytecodes::_ifge : if_zero(intType , If::geq); break; 2542 case Bytecodes::_ifgt : if_zero(intType , If::gtr); break; 2543 case Bytecodes::_ifle : if_zero(intType , If::leq); break; 2544 case Bytecodes::_if_icmpeq : if_same(intType , If::eql); break; 2545 case Bytecodes::_if_icmpne : if_same(intType , If::neq); break; 2546 case Bytecodes::_if_icmplt : if_same(intType , If::lss); break; 2547 case Bytecodes::_if_icmpge : if_same(intType , If::geq); break; 2548 case Bytecodes::_if_icmpgt : if_same(intType , If::gtr); break; 2549 case Bytecodes::_if_icmple : if_same(intType , If::leq); break; 2550 case Bytecodes::_if_acmpeq : if_same(objectType, If::eql); break; 2551 case Bytecodes::_if_acmpne : if_same(objectType, If::neq); break; 2552 case Bytecodes::_goto : _goto(s.cur_bci(), s.get_dest()); break; 2553 case Bytecodes::_jsr : jsr(s.get_dest()); break; 2554 case Bytecodes::_ret : ret(s.get_index()); break; 2555 case Bytecodes::_tableswitch : table_switch(); break; 2556 case Bytecodes::_lookupswitch : lookup_switch(); break; 2557 case Bytecodes::_ireturn : method_return(ipop()); break; 2558 case Bytecodes::_lreturn : method_return(lpop()); break; 2559 case Bytecodes::_freturn : method_return(fpop()); break; 2560 case Bytecodes::_dreturn : method_return(dpop()); break; 2561 case Bytecodes::_areturn : method_return(apop()); break; 2562 case Bytecodes::_return : method_return(NULL ); break; 2563 case Bytecodes::_getstatic : // fall through 2564 case Bytecodes::_putstatic : // fall through 2565 case Bytecodes::_getfield : // fall through 2566 case Bytecodes::_putfield : access_field(code); break; 2567 case Bytecodes::_invokevirtual : // fall through 2568 case Bytecodes::_invokespecial : // fall through 2569 case Bytecodes::_invokestatic : // fall through 2570 case Bytecodes::_invokedynamic : // fall through 2571 case Bytecodes::_invokeinterface: invoke(code); break; 2572 case Bytecodes::_new : new_instance(s.get_index_u2()); break; 2573 case Bytecodes::_newarray : new_type_array(); break; 2574 case Bytecodes::_anewarray : new_object_array(); break; 2575 case Bytecodes::_arraylength : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; } 2576 case Bytecodes::_athrow : throw_op(s.cur_bci()); break; 2577 case Bytecodes::_checkcast : check_cast(s.get_index_u2()); break; 2578 case Bytecodes::_instanceof : instance_of(s.get_index_u2()); break; 2579 case Bytecodes::_monitorenter : monitorenter(apop(), s.cur_bci()); break; 2580 case Bytecodes::_monitorexit : monitorexit (apop(), s.cur_bci()); break; 2581 case Bytecodes::_wide : ShouldNotReachHere(); break; 2582 case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break; 2583 case Bytecodes::_ifnull : if_null(objectType, If::eql); break; 2584 case Bytecodes::_ifnonnull : if_null(objectType, If::neq); break; 2585 case Bytecodes::_goto_w : _goto(s.cur_bci(), s.get_far_dest()); break; 2586 case Bytecodes::_jsr_w : jsr(s.get_far_dest()); break; 2587 case Bytecodes::_breakpoint : BAILOUT_("concurrent setting of breakpoint", NULL); 2588 default : ShouldNotReachHere(); break; 2589 } 2590 // save current bci to setup Goto at the end 2591 prev_bci = s.cur_bci(); 2592 } 2593 CHECK_BAILOUT_(NULL); 2594 // stop processing of this block (see try_inline_full) 2595 if (_skip_block) { 2596 _skip_block = false; 2597 assert(_last && _last->as_BlockEnd(), ""); 2598 return _last->as_BlockEnd(); 2599 } 2600 // if there are any, check if last instruction is a BlockEnd instruction 2601 BlockEnd* end = last()->as_BlockEnd(); 2602 if (end == NULL) { 2603 // all blocks must end with a BlockEnd instruction => add a Goto 2604 end = new Goto(block_at(s.cur_bci()), false); 2605 append(end); 2606 } 2607 assert(end == last()->as_BlockEnd(), "inconsistency"); 2608 2609 assert(end->state() != NULL, "state must already be present"); 2610 assert(end->as_Return() == NULL || end->as_Throw() == NULL || end->state()->stack_size() == 0, "stack not needed for return and throw"); 2611 2612 // connect to begin & set state 2613 // NOTE that inlining may have changed the block we are parsing 2614 block()->set_end(end); 2615 // propagate state 2616 for (int i = end->number_of_sux() - 1; i >= 0; i--) { 2617 BlockBegin* sux = end->sux_at(i); 2618 assert(sux->is_predecessor(block()), "predecessor missing"); 2619 // be careful, bailout if bytecodes are strange 2620 if (!sux->try_merge(end->state())) BAILOUT_("block join failed", NULL); 2621 scope_data()->add_to_work_list(end->sux_at(i)); 2622 } 2623 2624 scope_data()->set_stream(NULL); 2625 2626 // done 2627 return end; 2628 } 2629 2630 2631 void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) { 2632 do { 2633 if (start_in_current_block_for_inlining && !bailed_out()) { 2634 iterate_bytecodes_for_block(0); 2635 start_in_current_block_for_inlining = false; 2636 } else { 2637 BlockBegin* b; 2638 while ((b = scope_data()->remove_from_work_list()) != NULL) { 2639 if (!b->is_set(BlockBegin::was_visited_flag)) { 2640 if (b->is_set(BlockBegin::osr_entry_flag)) { 2641 // we're about to parse the osr entry block, so make sure 2642 // we setup the OSR edge leading into this block so that 2643 // Phis get setup correctly. 2644 setup_osr_entry_block(); 2645 // this is no longer the osr entry block, so clear it. 2646 b->clear(BlockBegin::osr_entry_flag); 2647 } 2648 b->set(BlockBegin::was_visited_flag); 2649 connect_to_end(b); 2650 } 2651 } 2652 } 2653 } while (!bailed_out() && !scope_data()->is_work_list_empty()); 2654 } 2655 2656 2657 bool GraphBuilder::_can_trap [Bytecodes::number_of_java_codes]; 2658 2659 void GraphBuilder::initialize() { 2660 // the following bytecodes are assumed to potentially 2661 // throw exceptions in compiled code - note that e.g. 2662 // monitorexit & the return bytecodes do not throw 2663 // exceptions since monitor pairing proved that they 2664 // succeed (if monitor pairing succeeded) 2665 Bytecodes::Code can_trap_list[] = 2666 { Bytecodes::_ldc 2667 , Bytecodes::_ldc_w 2668 , Bytecodes::_ldc2_w 2669 , Bytecodes::_iaload 2670 , Bytecodes::_laload 2671 , Bytecodes::_faload 2672 , Bytecodes::_daload 2673 , Bytecodes::_aaload 2674 , Bytecodes::_baload 2675 , Bytecodes::_caload 2676 , Bytecodes::_saload 2677 , Bytecodes::_iastore 2678 , Bytecodes::_lastore 2679 , Bytecodes::_fastore 2680 , Bytecodes::_dastore 2681 , Bytecodes::_aastore 2682 , Bytecodes::_bastore 2683 , Bytecodes::_castore 2684 , Bytecodes::_sastore 2685 , Bytecodes::_idiv 2686 , Bytecodes::_ldiv 2687 , Bytecodes::_irem 2688 , Bytecodes::_lrem 2689 , Bytecodes::_getstatic 2690 , Bytecodes::_putstatic 2691 , Bytecodes::_getfield 2692 , Bytecodes::_putfield 2693 , Bytecodes::_invokevirtual 2694 , Bytecodes::_invokespecial 2695 , Bytecodes::_invokestatic 2696 , Bytecodes::_invokedynamic 2697 , Bytecodes::_invokeinterface 2698 , Bytecodes::_new 2699 , Bytecodes::_newarray 2700 , Bytecodes::_anewarray 2701 , Bytecodes::_arraylength 2702 , Bytecodes::_athrow 2703 , Bytecodes::_checkcast 2704 , Bytecodes::_instanceof 2705 , Bytecodes::_monitorenter 2706 , Bytecodes::_multianewarray 2707 }; 2708 2709 // inititialize trap tables 2710 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { 2711 _can_trap[i] = false; 2712 } 2713 // set standard trap info 2714 for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) { 2715 _can_trap[can_trap_list[j]] = true; 2716 } 2717 } 2718 2719 2720 BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) { 2721 assert(entry->is_set(f), "entry/flag mismatch"); 2722 // create header block 2723 BlockBegin* h = new BlockBegin(entry->bci()); 2724 h->set_depth_first_number(0); 2725 2726 Value l = h; 2727 BlockEnd* g = new Goto(entry, false); 2728 l->set_next(g, entry->bci()); 2729 h->set_end(g); 2730 h->set(f); 2731 // setup header block end state 2732 ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis) 2733 assert(s->stack_is_empty(), "must have empty stack at entry point"); 2734 g->set_state(s); 2735 return h; 2736 } 2737 2738 2739 2740 BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) { 2741 BlockBegin* start = new BlockBegin(0); 2742 2743 // This code eliminates the empty start block at the beginning of 2744 // each method. Previously, each method started with the 2745 // start-block created below, and this block was followed by the 2746 // header block that was always empty. This header block is only 2747 // necesary if std_entry is also a backward branch target because 2748 // then phi functions may be necessary in the header block. It's 2749 // also necessary when profiling so that there's a single block that 2750 // can increment the interpreter_invocation_count. 2751 BlockBegin* new_header_block; 2752 if (std_entry->number_of_preds() > 0 || count_invocations() || count_backedges()) { 2753 new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state); 2754 } else { 2755 new_header_block = std_entry; 2756 } 2757 2758 // setup start block (root for the IR graph) 2759 Base* base = 2760 new Base( 2761 new_header_block, 2762 osr_entry 2763 ); 2764 start->set_next(base, 0); 2765 start->set_end(base); 2766 // create & setup state for start block 2767 start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci())); 2768 base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci())); 2769 2770 if (base->std_entry()->state() == NULL) { 2771 // setup states for header blocks 2772 base->std_entry()->merge(state); 2773 } 2774 2775 assert(base->std_entry()->state() != NULL, ""); 2776 return start; 2777 } 2778 2779 2780 void GraphBuilder::setup_osr_entry_block() { 2781 assert(compilation()->is_osr_compile(), "only for osrs"); 2782 2783 int osr_bci = compilation()->osr_bci(); 2784 ciBytecodeStream s(method()); 2785 s.reset_to_bci(osr_bci); 2786 s.next(); 2787 scope_data()->set_stream(&s); 2788 2789 // create a new block to be the osr setup code 2790 _osr_entry = new BlockBegin(osr_bci); 2791 _osr_entry->set(BlockBegin::osr_entry_flag); 2792 _osr_entry->set_depth_first_number(0); 2793 BlockBegin* target = bci2block()->at(osr_bci); 2794 assert(target != NULL && target->is_set(BlockBegin::osr_entry_flag), "must be there"); 2795 // the osr entry has no values for locals 2796 ValueStack* state = target->state()->copy(); 2797 _osr_entry->set_state(state); 2798 2799 kill_all(); 2800 _block = _osr_entry; 2801 _state = _osr_entry->state()->copy(); 2802 assert(_state->bci() == osr_bci, "mismatch"); 2803 _last = _osr_entry; 2804 Value e = append(new OsrEntry()); 2805 e->set_needs_null_check(false); 2806 2807 // OSR buffer is 2808 // 2809 // locals[nlocals-1..0] 2810 // monitors[number_of_locks-1..0] 2811 // 2812 // locals is a direct copy of the interpreter frame so in the osr buffer 2813 // so first slot in the local array is the last local from the interpreter 2814 // and last slot is local[0] (receiver) from the interpreter 2815 // 2816 // Similarly with locks. The first lock slot in the osr buffer is the nth lock 2817 // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock 2818 // in the interpreter frame (the method lock if a sync method) 2819 2820 // Initialize monitors in the compiled activation. 2821 2822 int index; 2823 Value local; 2824 2825 // find all the locals that the interpreter thinks contain live oops 2826 const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci); 2827 2828 // compute the offset into the locals so that we can treat the buffer 2829 // as if the locals were still in the interpreter frame 2830 int locals_offset = BytesPerWord * (method()->max_locals() - 1); 2831 for_each_local_value(state, index, local) { 2832 int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord; 2833 Value get; 2834 if (local->type()->is_object_kind() && !live_oops.at(index)) { 2835 // The interpreter thinks this local is dead but the compiler 2836 // doesn't so pretend that the interpreter passed in null. 2837 get = append(new Constant(objectNull)); 2838 } else { 2839 get = append(new UnsafeGetRaw(as_BasicType(local->type()), e, 2840 append(new Constant(new IntConstant(offset))), 2841 0, 2842 true /*unaligned*/, true /*wide*/)); 2843 } 2844 _state->store_local(index, get); 2845 } 2846 2847 // the storage for the OSR buffer is freed manually in the LIRGenerator. 2848 2849 assert(state->caller_state() == NULL, "should be top scope"); 2850 state->clear_locals(); 2851 Goto* g = new Goto(target, false); 2852 append(g); 2853 _osr_entry->set_end(g); 2854 target->merge(_osr_entry->end()->state()); 2855 2856 scope_data()->set_stream(NULL); 2857 } 2858 2859 2860 ValueStack* GraphBuilder::state_at_entry() { 2861 ValueStack* state = new ValueStack(scope(), NULL); 2862 2863 // Set up locals for receiver 2864 int idx = 0; 2865 if (!method()->is_static()) { 2866 // we should always see the receiver 2867 state->store_local(idx, new Local(method()->holder(), objectType, idx)); 2868 idx = 1; 2869 } 2870 2871 // Set up locals for incoming arguments 2872 ciSignature* sig = method()->signature(); 2873 for (int i = 0; i < sig->count(); i++) { 2874 ciType* type = sig->type_at(i); 2875 BasicType basic_type = type->basic_type(); 2876 // don't allow T_ARRAY to propagate into locals types 2877 if (basic_type == T_ARRAY) basic_type = T_OBJECT; 2878 ValueType* vt = as_ValueType(basic_type); 2879 state->store_local(idx, new Local(type, vt, idx)); 2880 idx += type->size(); 2881 } 2882 2883 // lock synchronized method 2884 if (method()->is_synchronized()) { 2885 state->lock(NULL); 2886 } 2887 2888 return state; 2889 } 2890 2891 2892 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope) 2893 : _scope_data(NULL) 2894 , _instruction_count(0) 2895 , _osr_entry(NULL) 2896 , _memory(new MemoryBuffer()) 2897 , _compilation(compilation) 2898 , _inline_bailout_msg(NULL) 2899 { 2900 int osr_bci = compilation->osr_bci(); 2901 2902 // determine entry points and bci2block mapping 2903 BlockListBuilder blm(compilation, scope, osr_bci); 2904 CHECK_BAILOUT(); 2905 2906 BlockList* bci2block = blm.bci2block(); 2907 BlockBegin* start_block = bci2block->at(0); 2908 2909 push_root_scope(scope, bci2block, start_block); 2910 2911 // setup state for std entry 2912 _initial_state = state_at_entry(); 2913 start_block->merge(_initial_state); 2914 2915 // complete graph 2916 _vmap = new ValueMap(); 2917 switch (scope->method()->intrinsic_id()) { 2918 case vmIntrinsics::_dabs : // fall through 2919 case vmIntrinsics::_dsqrt : // fall through 2920 case vmIntrinsics::_dsin : // fall through 2921 case vmIntrinsics::_dcos : // fall through 2922 case vmIntrinsics::_dtan : // fall through 2923 case vmIntrinsics::_dlog : // fall through 2924 case vmIntrinsics::_dlog10 : // fall through 2925 { 2926 // Compiles where the root method is an intrinsic need a special 2927 // compilation environment because the bytecodes for the method 2928 // shouldn't be parsed during the compilation, only the special 2929 // Intrinsic node should be emitted. If this isn't done the the 2930 // code for the inlined version will be different than the root 2931 // compiled version which could lead to monotonicity problems on 2932 // intel. 2933 2934 // Set up a stream so that appending instructions works properly. 2935 ciBytecodeStream s(scope->method()); 2936 s.reset_to_bci(0); 2937 scope_data()->set_stream(&s); 2938 s.next(); 2939 2940 // setup the initial block state 2941 _block = start_block; 2942 _state = start_block->state()->copy_for_parsing(); 2943 _last = start_block; 2944 load_local(doubleType, 0); 2945 2946 // Emit the intrinsic node. 2947 bool result = try_inline_intrinsics(scope->method()); 2948 if (!result) BAILOUT("failed to inline intrinsic"); 2949 method_return(dpop()); 2950 2951 // connect the begin and end blocks and we're all done. 2952 BlockEnd* end = last()->as_BlockEnd(); 2953 block()->set_end(end); 2954 break; 2955 } 2956 2957 case vmIntrinsics::_Reference_get: 2958 { 2959 if (UseG1GC) { 2960 // With java.lang.ref.reference.get() we must go through the 2961 // intrinsic - when G1 is enabled - even when get() is the root 2962 // method of the compile so that, if necessary, the value in 2963 // the referent field of the reference object gets recorded by 2964 // the pre-barrier code. 2965 // Specifically, if G1 is enabled, the value in the referent 2966 // field is recorded by the G1 SATB pre barrier. This will 2967 // result in the referent being marked live and the reference 2968 // object removed from the list of discovered references during 2969 // reference processing. 2970 2971 // Set up a stream so that appending instructions works properly. 2972 ciBytecodeStream s(scope->method()); 2973 s.reset_to_bci(0); 2974 scope_data()->set_stream(&s); 2975 s.next(); 2976 2977 // setup the initial block state 2978 _block = start_block; 2979 _state = start_block->state()->copy_for_parsing(); 2980 _last = start_block; 2981 load_local(objectType, 0); 2982 2983 // Emit the intrinsic node. 2984 bool result = try_inline_intrinsics(scope->method()); 2985 if (!result) BAILOUT("failed to inline intrinsic"); 2986 method_return(apop()); 2987 2988 // connect the begin and end blocks and we're all done. 2989 BlockEnd* end = last()->as_BlockEnd(); 2990 block()->set_end(end); 2991 break; 2992 } 2993 // Otherwise, fall thru 2994 } 2995 2996 default: 2997 scope_data()->add_to_work_list(start_block); 2998 iterate_all_blocks(); 2999 break; 3000 } 3001 CHECK_BAILOUT(); 3002 3003 _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state); 3004 3005 eliminate_redundant_phis(_start); 3006 3007 NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats()); 3008 // for osr compile, bailout if some requirements are not fulfilled 3009 if (osr_bci != -1) { 3010 BlockBegin* osr_block = blm.bci2block()->at(osr_bci); 3011 assert(osr_block->is_set(BlockBegin::was_visited_flag),"osr entry must have been visited for osr compile"); 3012 3013 // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points 3014 if (!osr_block->state()->stack_is_empty()) { 3015 BAILOUT("stack not empty at OSR entry point"); 3016 } 3017 } 3018 #ifndef PRODUCT 3019 if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count); 3020 #endif 3021 } 3022 3023 3024 ValueStack* GraphBuilder::copy_state_before() { 3025 return copy_state_before_with_bci(bci()); 3026 } 3027 3028 ValueStack* GraphBuilder::copy_state_exhandling() { 3029 return copy_state_exhandling_with_bci(bci()); 3030 } 3031 3032 ValueStack* GraphBuilder::copy_state_for_exception() { 3033 return copy_state_for_exception_with_bci(bci()); 3034 } 3035 3036 ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) { 3037 return state()->copy(ValueStack::StateBefore, bci); 3038 } 3039 3040 ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) { 3041 if (!has_handler()) return NULL; 3042 return state()->copy(ValueStack::StateBefore, bci); 3043 } 3044 3045 ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) { 3046 ValueStack* s = copy_state_exhandling_with_bci(bci); 3047 if (s == NULL) { 3048 if (_compilation->env()->jvmti_can_access_local_variables()) { 3049 s = state()->copy(ValueStack::ExceptionState, bci); 3050 } else { 3051 s = state()->copy(ValueStack::EmptyExceptionState, bci); 3052 } 3053 } 3054 return s; 3055 } 3056 3057 int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const { 3058 int recur_level = 0; 3059 for (IRScope* s = scope(); s != NULL; s = s->caller()) { 3060 if (s->method() == cur_callee) { 3061 ++recur_level; 3062 } 3063 } 3064 return recur_level; 3065 } 3066 3067 3068 bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known, Value receiver) { 3069 // Clear out any existing inline bailout condition 3070 clear_inline_bailout(); 3071 3072 if (callee->should_exclude()) { 3073 // callee is excluded 3074 INLINE_BAILOUT("excluded by CompilerOracle") 3075 } else if (callee->should_not_inline()) { 3076 // callee is excluded 3077 INLINE_BAILOUT("disallowed by CompilerOracle") 3078 } else if (!callee->can_be_compiled()) { 3079 // callee is not compilable (prob. has breakpoints) 3080 INLINE_BAILOUT("not compilable (disabled)") 3081 } else if (callee->intrinsic_id() != vmIntrinsics::_none && try_inline_intrinsics(callee)) { 3082 // intrinsics can be native or not 3083 return true; 3084 } else if (callee->is_native()) { 3085 // non-intrinsic natives cannot be inlined 3086 INLINE_BAILOUT("non-intrinsic native") 3087 } else if (callee->is_abstract()) { 3088 INLINE_BAILOUT("abstract") 3089 } else { 3090 return try_inline_full(callee, holder_known, NULL, receiver); 3091 } 3092 } 3093 3094 3095 bool GraphBuilder::try_inline_intrinsics(ciMethod* callee) { 3096 if (!InlineNatives ) INLINE_BAILOUT("intrinsic method inlining disabled"); 3097 if (callee->is_synchronized()) { 3098 // We don't currently support any synchronized intrinsics 3099 return false; 3100 } 3101 3102 // callee seems like a good candidate 3103 // determine id 3104 bool preserves_state = false; 3105 bool cantrap = true; 3106 vmIntrinsics::ID id = callee->intrinsic_id(); 3107 switch (id) { 3108 case vmIntrinsics::_arraycopy : 3109 if (!InlineArrayCopy) return false; 3110 break; 3111 3112 case vmIntrinsics::_currentTimeMillis: 3113 case vmIntrinsics::_nanoTime: 3114 preserves_state = true; 3115 cantrap = false; 3116 break; 3117 3118 case vmIntrinsics::_floatToRawIntBits : 3119 case vmIntrinsics::_intBitsToFloat : 3120 case vmIntrinsics::_doubleToRawLongBits : 3121 case vmIntrinsics::_longBitsToDouble : 3122 if (!InlineMathNatives) return false; 3123 preserves_state = true; 3124 cantrap = false; 3125 break; 3126 3127 case vmIntrinsics::_getClass : 3128 if (!InlineClassNatives) return false; 3129 preserves_state = true; 3130 break; 3131 3132 case vmIntrinsics::_currentThread : 3133 if (!InlineThreadNatives) return false; 3134 preserves_state = true; 3135 cantrap = false; 3136 break; 3137 3138 case vmIntrinsics::_dabs : // fall through 3139 case vmIntrinsics::_dsqrt : // fall through 3140 case vmIntrinsics::_dsin : // fall through 3141 case vmIntrinsics::_dcos : // fall through 3142 case vmIntrinsics::_dtan : // fall through 3143 case vmIntrinsics::_dlog : // fall through 3144 case vmIntrinsics::_dlog10 : // fall through 3145 if (!InlineMathNatives) return false; 3146 cantrap = false; 3147 preserves_state = true; 3148 break; 3149 3150 // sun/misc/AtomicLong.attemptUpdate 3151 case vmIntrinsics::_attemptUpdate : 3152 if (!VM_Version::supports_cx8()) return false; 3153 if (!InlineAtomicLong) return false; 3154 preserves_state = true; 3155 break; 3156 3157 // Use special nodes for Unsafe instructions so we can more easily 3158 // perform an address-mode optimization on the raw variants 3159 case vmIntrinsics::_getObject : return append_unsafe_get_obj(callee, T_OBJECT, false); 3160 case vmIntrinsics::_getBoolean: return append_unsafe_get_obj(callee, T_BOOLEAN, false); 3161 case vmIntrinsics::_getByte : return append_unsafe_get_obj(callee, T_BYTE, false); 3162 case vmIntrinsics::_getShort : return append_unsafe_get_obj(callee, T_SHORT, false); 3163 case vmIntrinsics::_getChar : return append_unsafe_get_obj(callee, T_CHAR, false); 3164 case vmIntrinsics::_getInt : return append_unsafe_get_obj(callee, T_INT, false); 3165 case vmIntrinsics::_getLong : return append_unsafe_get_obj(callee, T_LONG, false); 3166 case vmIntrinsics::_getFloat : return append_unsafe_get_obj(callee, T_FLOAT, false); 3167 case vmIntrinsics::_getDouble : return append_unsafe_get_obj(callee, T_DOUBLE, false); 3168 3169 case vmIntrinsics::_putObject : return append_unsafe_put_obj(callee, T_OBJECT, false); 3170 case vmIntrinsics::_putBoolean: return append_unsafe_put_obj(callee, T_BOOLEAN, false); 3171 case vmIntrinsics::_putByte : return append_unsafe_put_obj(callee, T_BYTE, false); 3172 case vmIntrinsics::_putShort : return append_unsafe_put_obj(callee, T_SHORT, false); 3173 case vmIntrinsics::_putChar : return append_unsafe_put_obj(callee, T_CHAR, false); 3174 case vmIntrinsics::_putInt : return append_unsafe_put_obj(callee, T_INT, false); 3175 case vmIntrinsics::_putLong : return append_unsafe_put_obj(callee, T_LONG, false); 3176 case vmIntrinsics::_putFloat : return append_unsafe_put_obj(callee, T_FLOAT, false); 3177 case vmIntrinsics::_putDouble : return append_unsafe_put_obj(callee, T_DOUBLE, false); 3178 3179 case vmIntrinsics::_getObjectVolatile : return append_unsafe_get_obj(callee, T_OBJECT, true); 3180 case vmIntrinsics::_getBooleanVolatile: return append_unsafe_get_obj(callee, T_BOOLEAN, true); 3181 case vmIntrinsics::_getByteVolatile : return append_unsafe_get_obj(callee, T_BYTE, true); 3182 case vmIntrinsics::_getShortVolatile : return append_unsafe_get_obj(callee, T_SHORT, true); 3183 case vmIntrinsics::_getCharVolatile : return append_unsafe_get_obj(callee, T_CHAR, true); 3184 case vmIntrinsics::_getIntVolatile : return append_unsafe_get_obj(callee, T_INT, true); 3185 case vmIntrinsics::_getLongVolatile : return append_unsafe_get_obj(callee, T_LONG, true); 3186 case vmIntrinsics::_getFloatVolatile : return append_unsafe_get_obj(callee, T_FLOAT, true); 3187 case vmIntrinsics::_getDoubleVolatile : return append_unsafe_get_obj(callee, T_DOUBLE, true); 3188 3189 case vmIntrinsics::_putObjectVolatile : return append_unsafe_put_obj(callee, T_OBJECT, true); 3190 case vmIntrinsics::_putBooleanVolatile: return append_unsafe_put_obj(callee, T_BOOLEAN, true); 3191 case vmIntrinsics::_putByteVolatile : return append_unsafe_put_obj(callee, T_BYTE, true); 3192 case vmIntrinsics::_putShortVolatile : return append_unsafe_put_obj(callee, T_SHORT, true); 3193 case vmIntrinsics::_putCharVolatile : return append_unsafe_put_obj(callee, T_CHAR, true); 3194 case vmIntrinsics::_putIntVolatile : return append_unsafe_put_obj(callee, T_INT, true); 3195 case vmIntrinsics::_putLongVolatile : return append_unsafe_put_obj(callee, T_LONG, true); 3196 case vmIntrinsics::_putFloatVolatile : return append_unsafe_put_obj(callee, T_FLOAT, true); 3197 case vmIntrinsics::_putDoubleVolatile : return append_unsafe_put_obj(callee, T_DOUBLE, true); 3198 3199 case vmIntrinsics::_getByte_raw : return append_unsafe_get_raw(callee, T_BYTE); 3200 case vmIntrinsics::_getShort_raw : return append_unsafe_get_raw(callee, T_SHORT); 3201 case vmIntrinsics::_getChar_raw : return append_unsafe_get_raw(callee, T_CHAR); 3202 case vmIntrinsics::_getInt_raw : return append_unsafe_get_raw(callee, T_INT); 3203 case vmIntrinsics::_getLong_raw : return append_unsafe_get_raw(callee, T_LONG); 3204 case vmIntrinsics::_getFloat_raw : return append_unsafe_get_raw(callee, T_FLOAT); 3205 case vmIntrinsics::_getDouble_raw : return append_unsafe_get_raw(callee, T_DOUBLE); 3206 3207 case vmIntrinsics::_putByte_raw : return append_unsafe_put_raw(callee, T_BYTE); 3208 case vmIntrinsics::_putShort_raw : return append_unsafe_put_raw(callee, T_SHORT); 3209 case vmIntrinsics::_putChar_raw : return append_unsafe_put_raw(callee, T_CHAR); 3210 case vmIntrinsics::_putInt_raw : return append_unsafe_put_raw(callee, T_INT); 3211 case vmIntrinsics::_putLong_raw : return append_unsafe_put_raw(callee, T_LONG); 3212 case vmIntrinsics::_putFloat_raw : return append_unsafe_put_raw(callee, T_FLOAT); 3213 case vmIntrinsics::_putDouble_raw : return append_unsafe_put_raw(callee, T_DOUBLE); 3214 3215 case vmIntrinsics::_prefetchRead : return append_unsafe_prefetch(callee, false, false); 3216 case vmIntrinsics::_prefetchWrite : return append_unsafe_prefetch(callee, false, true); 3217 case vmIntrinsics::_prefetchReadStatic : return append_unsafe_prefetch(callee, true, false); 3218 case vmIntrinsics::_prefetchWriteStatic : return append_unsafe_prefetch(callee, true, true); 3219 3220 case vmIntrinsics::_checkIndex : 3221 if (!InlineNIOCheckIndex) return false; 3222 preserves_state = true; 3223 break; 3224 case vmIntrinsics::_putOrderedObject : return append_unsafe_put_obj(callee, T_OBJECT, true); 3225 case vmIntrinsics::_putOrderedInt : return append_unsafe_put_obj(callee, T_INT, true); 3226 case vmIntrinsics::_putOrderedLong : return append_unsafe_put_obj(callee, T_LONG, true); 3227 3228 case vmIntrinsics::_compareAndSwapLong: 3229 if (!VM_Version::supports_cx8()) return false; 3230 // fall through 3231 case vmIntrinsics::_compareAndSwapInt: 3232 case vmIntrinsics::_compareAndSwapObject: 3233 append_unsafe_CAS(callee); 3234 return true; 3235 3236 case vmIntrinsics::_Reference_get: 3237 // It is only when G1 is enabled that we absolutely 3238 // need to use the intrinsic version of Reference.get() 3239 // so that the value in the referent field, if necessary, 3240 // can be registered by the pre-barrier code. 3241 if (!UseG1GC) return false; 3242 preserves_state = true; 3243 break; 3244 3245 default : return false; // do not inline 3246 } 3247 // create intrinsic node 3248 const bool has_receiver = !callee->is_static(); 3249 ValueType* result_type = as_ValueType(callee->return_type()); 3250 ValueStack* state_before = copy_state_for_exception(); 3251 3252 Values* args = state()->pop_arguments(callee->arg_size()); 3253 3254 if (is_profiling()) { 3255 // Don't profile in the special case where the root method 3256 // is the intrinsic 3257 if (callee != method()) { 3258 // Note that we'd collect profile data in this method if we wanted it. 3259 compilation()->set_would_profile(true); 3260 if (profile_calls()) { 3261 Value recv = NULL; 3262 if (has_receiver) { 3263 recv = args->at(0); 3264 null_check(recv); 3265 } 3266 profile_call(recv, NULL); 3267 } 3268 } 3269 } 3270 3271 Intrinsic* result = new Intrinsic(result_type, id, args, has_receiver, state_before, 3272 preserves_state, cantrap); 3273 // append instruction & push result 3274 Value value = append_split(result); 3275 if (result_type != voidType) push(result_type, value); 3276 3277 #ifndef PRODUCT 3278 // printing 3279 if (PrintInlining) { 3280 print_inline_result(callee, true); 3281 } 3282 #endif 3283 3284 // done 3285 return true; 3286 } 3287 3288 3289 bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) { 3290 // Introduce a new callee continuation point - all Ret instructions 3291 // will be replaced with Gotos to this point. 3292 BlockBegin* cont = block_at(next_bci()); 3293 assert(cont != NULL, "continuation must exist (BlockListBuilder starts a new block after a jsr"); 3294 3295 // Note: can not assign state to continuation yet, as we have to 3296 // pick up the state from the Ret instructions. 3297 3298 // Push callee scope 3299 push_scope_for_jsr(cont, jsr_dest_bci); 3300 3301 // Temporarily set up bytecode stream so we can append instructions 3302 // (only using the bci of this stream) 3303 scope_data()->set_stream(scope_data()->parent()->stream()); 3304 3305 BlockBegin* jsr_start_block = block_at(jsr_dest_bci); 3306 assert(jsr_start_block != NULL, "jsr start block must exist"); 3307 assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet"); 3308 Goto* goto_sub = new Goto(jsr_start_block, false); 3309 // Must copy state to avoid wrong sharing when parsing bytecodes 3310 assert(jsr_start_block->state() == NULL, "should have fresh jsr starting block"); 3311 jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci)); 3312 append(goto_sub); 3313 _block->set_end(goto_sub); 3314 _last = _block = jsr_start_block; 3315 3316 // Clear out bytecode stream 3317 scope_data()->set_stream(NULL); 3318 3319 scope_data()->add_to_work_list(jsr_start_block); 3320 3321 // Ready to resume parsing in subroutine 3322 iterate_all_blocks(); 3323 3324 // If we bailed out during parsing, return immediately (this is bad news) 3325 CHECK_BAILOUT_(false); 3326 3327 // Detect whether the continuation can actually be reached. If not, 3328 // it has not had state set by the join() operations in 3329 // iterate_bytecodes_for_block()/ret() and we should not touch the 3330 // iteration state. The calling activation of 3331 // iterate_bytecodes_for_block will then complete normally. 3332 if (cont->state() != NULL) { 3333 if (!cont->is_set(BlockBegin::was_visited_flag)) { 3334 // add continuation to work list instead of parsing it immediately 3335 scope_data()->parent()->add_to_work_list(cont); 3336 } 3337 } 3338 3339 assert(jsr_continuation() == cont, "continuation must not have changed"); 3340 assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) || 3341 jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag), 3342 "continuation can only be visited in case of backward branches"); 3343 assert(_last && _last->as_BlockEnd(), "block must have end"); 3344 3345 // continuation is in work list, so end iteration of current block 3346 _skip_block = true; 3347 pop_scope_for_jsr(); 3348 3349 return true; 3350 } 3351 3352 3353 // Inline the entry of a synchronized method as a monitor enter and 3354 // register the exception handler which releases the monitor if an 3355 // exception is thrown within the callee. Note that the monitor enter 3356 // cannot throw an exception itself, because the receiver is 3357 // guaranteed to be non-null by the explicit null check at the 3358 // beginning of inlining. 3359 void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) { 3360 assert(lock != NULL && sync_handler != NULL, "lock or handler missing"); 3361 3362 monitorenter(lock, SynchronizationEntryBCI); 3363 assert(_last->as_MonitorEnter() != NULL, "monitor enter expected"); 3364 _last->set_needs_null_check(false); 3365 3366 sync_handler->set(BlockBegin::exception_entry_flag); 3367 sync_handler->set(BlockBegin::is_on_work_list_flag); 3368 3369 ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0); 3370 XHandler* h = new XHandler(desc); 3371 h->set_entry_block(sync_handler); 3372 scope_data()->xhandlers()->append(h); 3373 scope_data()->set_has_handler(); 3374 } 3375 3376 3377 // If an exception is thrown and not handled within an inlined 3378 // synchronized method, the monitor must be released before the 3379 // exception is rethrown in the outer scope. Generate the appropriate 3380 // instructions here. 3381 void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) { 3382 BlockBegin* orig_block = _block; 3383 ValueStack* orig_state = _state; 3384 Instruction* orig_last = _last; 3385 _last = _block = sync_handler; 3386 _state = sync_handler->state()->copy(); 3387 3388 assert(sync_handler != NULL, "handler missing"); 3389 assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here"); 3390 3391 assert(lock != NULL || default_handler, "lock or handler missing"); 3392 3393 XHandler* h = scope_data()->xhandlers()->remove_last(); 3394 assert(h->entry_block() == sync_handler, "corrupt list of handlers"); 3395 3396 block()->set(BlockBegin::was_visited_flag); 3397 Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI); 3398 assert(exception->is_pinned(), "must be"); 3399 3400 int bci = SynchronizationEntryBCI; 3401 if (compilation()->env()->dtrace_method_probes()) { 3402 // Report exit from inline methods. We don't have a stream here 3403 // so pass an explicit bci of SynchronizationEntryBCI. 3404 Values* args = new Values(1); 3405 args->push(append_with_bci(new Constant(new ObjectConstant(method())), bci)); 3406 append_with_bci(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args), bci); 3407 } 3408 3409 if (lock) { 3410 assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing"); 3411 if (!lock->is_linked()) { 3412 lock = append_with_bci(lock, bci); 3413 } 3414 3415 // exit the monitor in the context of the synchronized method 3416 monitorexit(lock, bci); 3417 3418 // exit the context of the synchronized method 3419 if (!default_handler) { 3420 pop_scope(); 3421 bci = _state->caller_state()->bci(); 3422 _state = _state->caller_state()->copy_for_parsing(); 3423 } 3424 } 3425 3426 // perform the throw as if at the the call site 3427 apush(exception); 3428 throw_op(bci); 3429 3430 BlockEnd* end = last()->as_BlockEnd(); 3431 block()->set_end(end); 3432 3433 _block = orig_block; 3434 _state = orig_state; 3435 _last = orig_last; 3436 } 3437 3438 3439 bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known, BlockBegin* cont_block, Value receiver) { 3440 assert(!callee->is_native(), "callee must not be native"); 3441 if (CompilationPolicy::policy()->should_not_inline(compilation()->env(), callee)) { 3442 INLINE_BAILOUT("inlining prohibited by policy"); 3443 } 3444 // first perform tests of things it's not possible to inline 3445 if (callee->has_exception_handlers() && 3446 !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers"); 3447 if (callee->is_synchronized() && 3448 !InlineSynchronizedMethods ) INLINE_BAILOUT("callee is synchronized"); 3449 if (!callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet"); 3450 if (!callee->has_balanced_monitors()) INLINE_BAILOUT("callee's monitors do not match"); 3451 3452 // Proper inlining of methods with jsrs requires a little more work. 3453 if (callee->has_jsrs() ) INLINE_BAILOUT("jsrs not handled properly by inliner yet"); 3454 3455 // When SSE2 is used on intel, then no special handling is needed 3456 // for strictfp because the enum-constant is fixed at compile time, 3457 // the check for UseSSE2 is needed here 3458 if (strict_fp_requires_explicit_rounding && UseSSE < 2 && method()->is_strict() != callee->is_strict()) { 3459 INLINE_BAILOUT("caller and callee have different strict fp requirements"); 3460 } 3461 3462 if (is_profiling() && !callee->ensure_method_data()) { 3463 INLINE_BAILOUT("mdo allocation failed"); 3464 } 3465 3466 // now perform tests that are based on flag settings 3467 if (callee->should_inline()) { 3468 // ignore heuristic controls on inlining 3469 } else { 3470 if (inline_level() > MaxInlineLevel ) INLINE_BAILOUT("too-deep inlining"); 3471 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("too-deep recursive inlining"); 3472 if (callee->code_size_for_inlining() > max_inline_size() ) INLINE_BAILOUT("callee is too large"); 3473 3474 // don't inline throwable methods unless the inlining tree is rooted in a throwable class 3475 if (callee->name() == ciSymbol::object_initializer_name() && 3476 callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) { 3477 // Throwable constructor call 3478 IRScope* top = scope(); 3479 while (top->caller() != NULL) { 3480 top = top->caller(); 3481 } 3482 if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) { 3483 INLINE_BAILOUT("don't inline Throwable constructors"); 3484 } 3485 } 3486 3487 if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) { 3488 INLINE_BAILOUT("total inlining greater than DesiredMethodLimit"); 3489 } 3490 } 3491 3492 #ifndef PRODUCT 3493 // printing 3494 if (PrintInlining) { 3495 print_inline_result(callee, true); 3496 } 3497 #endif 3498 3499 // NOTE: Bailouts from this point on, which occur at the 3500 // GraphBuilder level, do not cause bailout just of the inlining but 3501 // in fact of the entire compilation. 3502 3503 BlockBegin* orig_block = block(); 3504 3505 const int args_base = state()->stack_size() - callee->arg_size(); 3506 assert(args_base >= 0, "stack underflow during inlining"); 3507 3508 // Insert null check if necessary 3509 Value recv = NULL; 3510 if (code() != Bytecodes::_invokestatic && 3511 code() != Bytecodes::_invokedynamic) { 3512 // note: null check must happen even if first instruction of callee does 3513 // an implicit null check since the callee is in a different scope 3514 // and we must make sure exception handling does the right thing 3515 assert(!callee->is_static(), "callee must not be static"); 3516 assert(callee->arg_size() > 0, "must have at least a receiver"); 3517 recv = state()->stack_at(args_base); 3518 null_check(recv); 3519 } 3520 3521 if (is_profiling()) { 3522 // Note that we'd collect profile data in this method if we wanted it. 3523 // this may be redundant here... 3524 compilation()->set_would_profile(true); 3525 3526 if (profile_calls()) { 3527 profile_call(recv, holder_known ? callee->holder() : NULL); 3528 } 3529 } 3530 3531 // Introduce a new callee continuation point - if the callee has 3532 // more than one return instruction or the return does not allow 3533 // fall-through of control flow, all return instructions of the 3534 // callee will need to be replaced by Goto's pointing to this 3535 // continuation point. 3536 BlockBegin* cont = cont_block != NULL ? cont_block : block_at(next_bci()); 3537 bool continuation_existed = true; 3538 if (cont == NULL) { 3539 cont = new BlockBegin(next_bci()); 3540 // low number so that continuation gets parsed as early as possible 3541 cont->set_depth_first_number(0); 3542 #ifndef PRODUCT 3543 if (PrintInitialBlockList) { 3544 tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d", 3545 cont->block_id(), cont->bci(), bci()); 3546 } 3547 #endif 3548 continuation_existed = false; 3549 } 3550 // Record number of predecessors of continuation block before 3551 // inlining, to detect if inlined method has edges to its 3552 // continuation after inlining. 3553 int continuation_preds = cont->number_of_preds(); 3554 3555 // Push callee scope 3556 push_scope(callee, cont); 3557 3558 // the BlockListBuilder for the callee could have bailed out 3559 CHECK_BAILOUT_(false); 3560 3561 // Temporarily set up bytecode stream so we can append instructions 3562 // (only using the bci of this stream) 3563 scope_data()->set_stream(scope_data()->parent()->stream()); 3564 3565 // Pass parameters into callee state: add assignments 3566 // note: this will also ensure that all arguments are computed before being passed 3567 ValueStack* callee_state = state(); 3568 ValueStack* caller_state = state()->caller_state(); 3569 { int i = args_base; 3570 while (i < caller_state->stack_size()) { 3571 const int par_no = i - args_base; 3572 Value arg = caller_state->stack_at_inc(i); 3573 // NOTE: take base() of arg->type() to avoid problems storing 3574 // constants 3575 if (receiver != NULL && par_no == 0) { 3576 arg = receiver; 3577 } 3578 store_local(callee_state, arg, arg->type()->base(), par_no); 3579 } 3580 } 3581 3582 // Remove args from stack. 3583 // Note that we preserve locals state in case we can use it later 3584 // (see use of pop_scope() below) 3585 caller_state->truncate_stack(args_base); 3586 assert(callee_state->stack_size() == 0, "callee stack must be empty"); 3587 3588 Value lock; 3589 BlockBegin* sync_handler; 3590 3591 // Inline the locking of the receiver if the callee is synchronized 3592 if (callee->is_synchronized()) { 3593 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror()))) 3594 : state()->local_at(0); 3595 sync_handler = new BlockBegin(SynchronizationEntryBCI); 3596 inline_sync_entry(lock, sync_handler); 3597 } 3598 3599 if (compilation()->env()->dtrace_method_probes()) { 3600 Values* args = new Values(1); 3601 args->push(append(new Constant(new ObjectConstant(method())))); 3602 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args)); 3603 } 3604 3605 if (profile_inlined_calls()) { 3606 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI)); 3607 } 3608 3609 BlockBegin* callee_start_block = block_at(0); 3610 if (callee_start_block != NULL) { 3611 assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header"); 3612 Goto* goto_callee = new Goto(callee_start_block, false); 3613 // The state for this goto is in the scope of the callee, so use 3614 // the entry bci for the callee instead of the call site bci. 3615 append_with_bci(goto_callee, 0); 3616 _block->set_end(goto_callee); 3617 callee_start_block->merge(callee_state); 3618 3619 _last = _block = callee_start_block; 3620 3621 scope_data()->add_to_work_list(callee_start_block); 3622 } 3623 3624 // Clear out bytecode stream 3625 scope_data()->set_stream(NULL); 3626 3627 // Ready to resume parsing in callee (either in the same block we 3628 // were in before or in the callee's start block) 3629 iterate_all_blocks(callee_start_block == NULL); 3630 3631 // If we bailed out during parsing, return immediately (this is bad news) 3632 if (bailed_out()) return false; 3633 3634 // iterate_all_blocks theoretically traverses in random order; in 3635 // practice, we have only traversed the continuation if we are 3636 // inlining into a subroutine 3637 assert(continuation_existed || 3638 !continuation()->is_set(BlockBegin::was_visited_flag), 3639 "continuation should not have been parsed yet if we created it"); 3640 3641 // If we bailed out during parsing, return immediately (this is bad news) 3642 CHECK_BAILOUT_(false); 3643 3644 // At this point we are almost ready to return and resume parsing of 3645 // the caller back in the GraphBuilder. The only thing we want to do 3646 // first is an optimization: during parsing of the callee we 3647 // generated at least one Goto to the continuation block. If we 3648 // generated exactly one, and if the inlined method spanned exactly 3649 // one block (and we didn't have to Goto its entry), then we snip 3650 // off the Goto to the continuation, allowing control to fall 3651 // through back into the caller block and effectively performing 3652 // block merging. This allows load elimination and CSE to take place 3653 // across multiple callee scopes if they are relatively simple, and 3654 // is currently essential to making inlining profitable. 3655 if (cont_block == NULL) { 3656 if (num_returns() == 1 3657 && block() == orig_block 3658 && block() == inline_cleanup_block()) { 3659 _last = inline_cleanup_return_prev(); 3660 _state = inline_cleanup_state(); 3661 } else if (continuation_preds == cont->number_of_preds()) { 3662 // Inlining caused that the instructions after the invoke in the 3663 // caller are not reachable any more. So skip filling this block 3664 // with instructions! 3665 assert(cont == continuation(), ""); 3666 assert(_last && _last->as_BlockEnd(), ""); 3667 _skip_block = true; 3668 } else { 3669 // Resume parsing in continuation block unless it was already parsed. 3670 // Note that if we don't change _last here, iteration in 3671 // iterate_bytecodes_for_block will stop when we return. 3672 if (!continuation()->is_set(BlockBegin::was_visited_flag)) { 3673 // add continuation to work list instead of parsing it immediately 3674 assert(_last && _last->as_BlockEnd(), ""); 3675 scope_data()->parent()->add_to_work_list(continuation()); 3676 _skip_block = true; 3677 } 3678 } 3679 } 3680 3681 // Fill the exception handler for synchronized methods with instructions 3682 if (callee->is_synchronized() && sync_handler->state() != NULL) { 3683 fill_sync_handler(lock, sync_handler); 3684 } else { 3685 pop_scope(); 3686 } 3687 3688 compilation()->notice_inlined_method(callee); 3689 3690 return true; 3691 } 3692 3693 3694 bool GraphBuilder::for_method_handle_inline(ciMethod* callee) { 3695 assert(!callee->is_static(), "change next line"); 3696 int index = state()->stack_size() - (callee->arg_size_no_receiver() + 1); 3697 Value receiver = state()->stack_at(index); 3698 3699 if (receiver->type()->is_constant()) { 3700 ciMethodHandle* method_handle = receiver->type()->as_ObjectType()->constant_value()->as_method_handle(); 3701 3702 // Set the callee to have access to the class and signature in 3703 // the MethodHandleCompiler. 3704 method_handle->set_callee(callee); 3705 method_handle->set_caller(method()); 3706 3707 // Get an adapter for the MethodHandle. 3708 ciMethod* method_handle_adapter = method_handle->get_method_handle_adapter(); 3709 if (method_handle_adapter != NULL) { 3710 return try_inline(method_handle_adapter, /*holder_known=*/ true); 3711 } 3712 } else if (receiver->as_CheckCast()) { 3713 // Match MethodHandle.selectAlternative idiom 3714 Phi* phi = receiver->as_CheckCast()->obj()->as_Phi(); 3715 3716 if (phi != NULL && phi->operand_count() == 2) { 3717 // Get the two MethodHandle inputs from the Phi. 3718 Value op1 = phi->operand_at(0); 3719 Value op2 = phi->operand_at(1); 3720 ObjectType* op1type = op1->type()->as_ObjectType(); 3721 ObjectType* op2type = op2->type()->as_ObjectType(); 3722 3723 if (op1type->is_constant() && op2type->is_constant()) { 3724 ciMethodHandle* mh1 = op1type->constant_value()->as_method_handle(); 3725 ciMethodHandle* mh2 = op2type->constant_value()->as_method_handle(); 3726 3727 // Set the callee to have access to the class and signature in 3728 // the MethodHandleCompiler. 3729 mh1->set_callee(callee); 3730 mh1->set_caller(method()); 3731 mh2->set_callee(callee); 3732 mh2->set_caller(method()); 3733 3734 // Get adapters for the MethodHandles. 3735 ciMethod* mh1_adapter = mh1->get_method_handle_adapter(); 3736 ciMethod* mh2_adapter = mh2->get_method_handle_adapter(); 3737 3738 if (mh1_adapter != NULL && mh2_adapter != NULL) { 3739 set_inline_cleanup_info(); 3740 3741 // Build the If guard 3742 BlockBegin* one = new BlockBegin(next_bci()); 3743 BlockBegin* two = new BlockBegin(next_bci()); 3744 BlockBegin* end = new BlockBegin(next_bci()); 3745 Instruction* iff = append(new If(phi, If::eql, false, op1, one, two, NULL, false)); 3746 block()->set_end(iff->as_BlockEnd()); 3747 3748 // Connect up the states 3749 one->merge(block()->end()->state()); 3750 two->merge(block()->end()->state()); 3751 3752 // Save the state for the second inlinee 3753 ValueStack* state_before = copy_state_before(); 3754 3755 // Parse first adapter 3756 _last = _block = one; 3757 if (!try_inline_full(mh1_adapter, /*holder_known=*/ true, end, NULL)) { 3758 restore_inline_cleanup_info(); 3759 block()->clear_end(); // remove appended iff 3760 return false; 3761 } 3762 3763 // Parse second adapter 3764 _last = _block = two; 3765 _state = state_before; 3766 if (!try_inline_full(mh2_adapter, /*holder_known=*/ true, end, NULL)) { 3767 restore_inline_cleanup_info(); 3768 block()->clear_end(); // remove appended iff 3769 return false; 3770 } 3771 3772 connect_to_end(end); 3773 return true; 3774 } 3775 } 3776 } 3777 } 3778 return false; 3779 } 3780 3781 3782 bool GraphBuilder::for_invokedynamic_inline(ciMethod* callee) { 3783 // Get the MethodHandle from the CallSite. 3784 ciCallSite* call_site = stream()->get_call_site(); 3785 ciMethodHandle* method_handle = call_site->get_target(); 3786 3787 // Set the callee to have access to the class and signature in the 3788 // MethodHandleCompiler. 3789 method_handle->set_callee(callee); 3790 method_handle->set_caller(method()); 3791 3792 // Get an adapter for the MethodHandle. 3793 ciMethod* method_handle_adapter = method_handle->get_invokedynamic_adapter(); 3794 if (method_handle_adapter != NULL) { 3795 if (try_inline(method_handle_adapter, /*holder_known=*/ true)) { 3796 // Add a dependence for invalidation of the optimization. 3797 if (!call_site->is_constant_call_site()) { 3798 dependency_recorder()->assert_call_site_target_value(call_site, method_handle); 3799 } 3800 return true; 3801 } 3802 } 3803 return false; 3804 } 3805 3806 3807 void GraphBuilder::inline_bailout(const char* msg) { 3808 assert(msg != NULL, "inline bailout msg must exist"); 3809 _inline_bailout_msg = msg; 3810 } 3811 3812 3813 void GraphBuilder::clear_inline_bailout() { 3814 _inline_bailout_msg = NULL; 3815 } 3816 3817 3818 void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) { 3819 ScopeData* data = new ScopeData(NULL); 3820 data->set_scope(scope); 3821 data->set_bci2block(bci2block); 3822 _scope_data = data; 3823 _block = start; 3824 } 3825 3826 3827 void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) { 3828 IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false); 3829 scope()->add_callee(callee_scope); 3830 3831 BlockListBuilder blb(compilation(), callee_scope, -1); 3832 CHECK_BAILOUT(); 3833 3834 if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) { 3835 // this scope can be inlined directly into the caller so remove 3836 // the block at bci 0. 3837 blb.bci2block()->at_put(0, NULL); 3838 } 3839 3840 set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci()))); 3841 3842 ScopeData* data = new ScopeData(scope_data()); 3843 data->set_scope(callee_scope); 3844 data->set_bci2block(blb.bci2block()); 3845 data->set_continuation(continuation); 3846 _scope_data = data; 3847 } 3848 3849 3850 void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) { 3851 ScopeData* data = new ScopeData(scope_data()); 3852 data->set_parsing_jsr(); 3853 data->set_jsr_entry_bci(jsr_dest_bci); 3854 data->set_jsr_return_address_local(-1); 3855 // Must clone bci2block list as we will be mutating it in order to 3856 // properly clone all blocks in jsr region as well as exception 3857 // handlers containing rets 3858 BlockList* new_bci2block = new BlockList(bci2block()->length()); 3859 new_bci2block->push_all(bci2block()); 3860 data->set_bci2block(new_bci2block); 3861 data->set_scope(scope()); 3862 data->setup_jsr_xhandlers(); 3863 data->set_continuation(continuation()); 3864 data->set_jsr_continuation(jsr_continuation); 3865 _scope_data = data; 3866 } 3867 3868 3869 void GraphBuilder::pop_scope() { 3870 int number_of_locks = scope()->number_of_locks(); 3871 _scope_data = scope_data()->parent(); 3872 // accumulate minimum number of monitor slots to be reserved 3873 scope()->set_min_number_of_locks(number_of_locks); 3874 } 3875 3876 3877 void GraphBuilder::pop_scope_for_jsr() { 3878 _scope_data = scope_data()->parent(); 3879 } 3880 3881 bool GraphBuilder::append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile) { 3882 if (InlineUnsafeOps) { 3883 Values* args = state()->pop_arguments(callee->arg_size()); 3884 null_check(args->at(0)); 3885 Instruction* offset = args->at(2); 3886 #ifndef _LP64 3887 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 3888 #endif 3889 Instruction* op = append(new UnsafeGetObject(t, args->at(1), offset, is_volatile)); 3890 push(op->type(), op); 3891 compilation()->set_has_unsafe_access(true); 3892 } 3893 return InlineUnsafeOps; 3894 } 3895 3896 3897 bool GraphBuilder::append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile) { 3898 if (InlineUnsafeOps) { 3899 Values* args = state()->pop_arguments(callee->arg_size()); 3900 null_check(args->at(0)); 3901 Instruction* offset = args->at(2); 3902 #ifndef _LP64 3903 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 3904 #endif 3905 Instruction* op = append(new UnsafePutObject(t, args->at(1), offset, args->at(3), is_volatile)); 3906 compilation()->set_has_unsafe_access(true); 3907 kill_all(); 3908 } 3909 return InlineUnsafeOps; 3910 } 3911 3912 3913 bool GraphBuilder::append_unsafe_get_raw(ciMethod* callee, BasicType t) { 3914 if (InlineUnsafeOps) { 3915 Values* args = state()->pop_arguments(callee->arg_size()); 3916 null_check(args->at(0)); 3917 Instruction* op = append(new UnsafeGetRaw(t, args->at(1), false)); 3918 push(op->type(), op); 3919 compilation()->set_has_unsafe_access(true); 3920 } 3921 return InlineUnsafeOps; 3922 } 3923 3924 3925 bool GraphBuilder::append_unsafe_put_raw(ciMethod* callee, BasicType t) { 3926 if (InlineUnsafeOps) { 3927 Values* args = state()->pop_arguments(callee->arg_size()); 3928 null_check(args->at(0)); 3929 Instruction* op = append(new UnsafePutRaw(t, args->at(1), args->at(2))); 3930 compilation()->set_has_unsafe_access(true); 3931 } 3932 return InlineUnsafeOps; 3933 } 3934 3935 3936 bool GraphBuilder::append_unsafe_prefetch(ciMethod* callee, bool is_static, bool is_store) { 3937 if (InlineUnsafeOps) { 3938 Values* args = state()->pop_arguments(callee->arg_size()); 3939 int obj_arg_index = 1; // Assume non-static case 3940 if (is_static) { 3941 obj_arg_index = 0; 3942 } else { 3943 null_check(args->at(0)); 3944 } 3945 Instruction* offset = args->at(obj_arg_index + 1); 3946 #ifndef _LP64 3947 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 3948 #endif 3949 Instruction* op = is_store ? append(new UnsafePrefetchWrite(args->at(obj_arg_index), offset)) 3950 : append(new UnsafePrefetchRead (args->at(obj_arg_index), offset)); 3951 compilation()->set_has_unsafe_access(true); 3952 } 3953 return InlineUnsafeOps; 3954 } 3955 3956 3957 void GraphBuilder::append_unsafe_CAS(ciMethod* callee) { 3958 ValueStack* state_before = copy_state_for_exception(); 3959 ValueType* result_type = as_ValueType(callee->return_type()); 3960 assert(result_type->is_int(), "int result"); 3961 Values* args = state()->pop_arguments(callee->arg_size()); 3962 3963 // Pop off some args to speically handle, then push back 3964 Value newval = args->pop(); 3965 Value cmpval = args->pop(); 3966 Value offset = args->pop(); 3967 Value src = args->pop(); 3968 Value unsafe_obj = args->pop(); 3969 3970 // Separately handle the unsafe arg. It is not needed for code 3971 // generation, but must be null checked 3972 null_check(unsafe_obj); 3973 3974 #ifndef _LP64 3975 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 3976 #endif 3977 3978 args->push(src); 3979 args->push(offset); 3980 args->push(cmpval); 3981 args->push(newval); 3982 3983 // An unsafe CAS can alias with other field accesses, but we don't 3984 // know which ones so mark the state as no preserved. This will 3985 // cause CSE to invalidate memory across it. 3986 bool preserves_state = false; 3987 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state); 3988 append_split(result); 3989 push(result_type, result); 3990 compilation()->set_has_unsafe_access(true); 3991 } 3992 3993 3994 #ifndef PRODUCT 3995 void GraphBuilder::print_inline_result(ciMethod* callee, bool res) { 3996 CompileTask::print_inlining(callee, scope()->level(), bci(), _inline_bailout_msg); 3997 if (res && CIPrintMethodCodes) { 3998 callee->print_codes(); 3999 } 4000 } 4001 4002 4003 void GraphBuilder::print_stats() { 4004 vmap()->print(); 4005 } 4006 #endif // PRODUCT 4007 4008 void GraphBuilder::profile_call(Value recv, ciKlass* known_holder) { 4009 append(new ProfileCall(method(), bci(), recv, known_holder)); 4010 } 4011 4012 void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) { 4013 append(new ProfileInvoke(callee, state)); 4014 }