1 /* 2 * Copyright (c) 1999, 2018, 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/ciMemberName.hpp" 35 #include "compiler/compileBroker.hpp" 36 #include "interpreter/bytecode.hpp" 37 #include "memory/resourceArea.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "runtime/sharedRuntime.hpp" 40 #include "runtime/compilationPolicy.hpp" 41 #include "runtime/vm_version.hpp" 42 #include "utilities/bitMap.inline.hpp" 43 44 class BlockListBuilder VALUE_OBJ_CLASS_SPEC { 45 private: 46 Compilation* _compilation; 47 IRScope* _scope; 48 49 BlockList _blocks; // internal list of all blocks 50 BlockList* _bci2block; // mapping from bci to blocks for GraphBuilder 51 52 // fields used by mark_loops 53 ResourceBitMap _active; // for iteration of control flow graph 54 ResourceBitMap _visited; // for iteration of control flow graph 55 intArray _loop_map; // caches the information if a block is contained in a loop 56 int _next_loop_index; // next free loop number 57 int _next_block_number; // for reverse postorder numbering of blocks 58 59 // accessors 60 Compilation* compilation() const { return _compilation; } 61 IRScope* scope() const { return _scope; } 62 ciMethod* method() const { return scope()->method(); } 63 XHandlers* xhandlers() const { return scope()->xhandlers(); } 64 65 // unified bailout support 66 void bailout(const char* msg) const { compilation()->bailout(msg); } 67 bool bailed_out() const { return compilation()->bailed_out(); } 68 69 // helper functions 70 BlockBegin* make_block_at(int bci, BlockBegin* predecessor); 71 void handle_exceptions(BlockBegin* current, int cur_bci); 72 void handle_jsr(BlockBegin* current, int sr_bci, int next_bci); 73 void store_one(BlockBegin* current, int local); 74 void store_two(BlockBegin* current, int local); 75 void set_entries(int osr_bci); 76 void set_leaders(); 77 78 void make_loop_header(BlockBegin* block); 79 void mark_loops(); 80 int mark_loops(BlockBegin* b, bool in_subroutine); 81 82 // debugging 83 #ifndef PRODUCT 84 void print(); 85 #endif 86 87 public: 88 // creation 89 BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci); 90 91 // accessors for GraphBuilder 92 BlockList* bci2block() const { return _bci2block; } 93 }; 94 95 96 // Implementation of BlockListBuilder 97 98 BlockListBuilder::BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci) 99 : _compilation(compilation) 100 , _scope(scope) 101 , _blocks(16) 102 , _bci2block(new BlockList(scope->method()->code_size(), NULL)) 103 , _next_block_number(0) 104 , _active() // size not known yet 105 , _visited() // size not known yet 106 , _next_loop_index(0) 107 , _loop_map() // size not known yet 108 { 109 set_entries(osr_bci); 110 set_leaders(); 111 CHECK_BAILOUT(); 112 113 mark_loops(); 114 NOT_PRODUCT(if (PrintInitialBlockList) print()); 115 116 #ifndef PRODUCT 117 if (PrintCFGToFile) { 118 stringStream title; 119 title.print("BlockListBuilder "); 120 scope->method()->print_name(&title); 121 CFGPrinter::print_cfg(_bci2block, title.as_string(), false, false); 122 } 123 #endif 124 } 125 126 127 void BlockListBuilder::set_entries(int osr_bci) { 128 // generate start blocks 129 BlockBegin* std_entry = make_block_at(0, NULL); 130 if (scope()->caller() == NULL) { 131 std_entry->set(BlockBegin::std_entry_flag); 132 } 133 if (osr_bci != -1) { 134 BlockBegin* osr_entry = make_block_at(osr_bci, NULL); 135 osr_entry->set(BlockBegin::osr_entry_flag); 136 } 137 138 // generate exception entry blocks 139 XHandlers* list = xhandlers(); 140 const int n = list->length(); 141 for (int i = 0; i < n; i++) { 142 XHandler* h = list->handler_at(i); 143 BlockBegin* entry = make_block_at(h->handler_bci(), NULL); 144 entry->set(BlockBegin::exception_entry_flag); 145 h->set_entry_block(entry); 146 } 147 } 148 149 150 BlockBegin* BlockListBuilder::make_block_at(int cur_bci, BlockBegin* predecessor) { 151 assert(method()->bci_block_start().at(cur_bci), "wrong block starts of MethodLivenessAnalyzer"); 152 153 BlockBegin* block = _bci2block->at(cur_bci); 154 if (block == NULL) { 155 block = new BlockBegin(cur_bci); 156 block->init_stores_to_locals(method()->max_locals()); 157 _bci2block->at_put(cur_bci, block); 158 _blocks.append(block); 159 160 assert(predecessor == NULL || predecessor->bci() < cur_bci, "targets for backward branches must already exist"); 161 } 162 163 if (predecessor != NULL) { 164 if (block->is_set(BlockBegin::exception_entry_flag)) { 165 BAILOUT_("Exception handler can be reached by both normal and exceptional control flow", block); 166 } 167 168 predecessor->add_successor(block); 169 block->increment_total_preds(); 170 } 171 172 return block; 173 } 174 175 176 inline void BlockListBuilder::store_one(BlockBegin* current, int local) { 177 current->stores_to_locals().set_bit(local); 178 } 179 inline void BlockListBuilder::store_two(BlockBegin* current, int local) { 180 store_one(current, local); 181 store_one(current, local + 1); 182 } 183 184 185 void BlockListBuilder::handle_exceptions(BlockBegin* current, int cur_bci) { 186 // Draws edges from a block to its exception handlers 187 XHandlers* list = xhandlers(); 188 const int n = list->length(); 189 190 for (int i = 0; i < n; i++) { 191 XHandler* h = list->handler_at(i); 192 193 if (h->covers(cur_bci)) { 194 BlockBegin* entry = h->entry_block(); 195 assert(entry != NULL && entry == _bci2block->at(h->handler_bci()), "entry must be set"); 196 assert(entry->is_set(BlockBegin::exception_entry_flag), "flag must be set"); 197 198 // add each exception handler only once 199 if (!current->is_successor(entry)) { 200 current->add_successor(entry); 201 entry->increment_total_preds(); 202 } 203 204 // stop when reaching catchall 205 if (h->catch_type() == 0) break; 206 } 207 } 208 } 209 210 void BlockListBuilder::handle_jsr(BlockBegin* current, int sr_bci, int next_bci) { 211 // start a new block after jsr-bytecode and link this block into cfg 212 make_block_at(next_bci, current); 213 214 // start a new block at the subroutine entry at mark it with special flag 215 BlockBegin* sr_block = make_block_at(sr_bci, current); 216 if (!sr_block->is_set(BlockBegin::subroutine_entry_flag)) { 217 sr_block->set(BlockBegin::subroutine_entry_flag); 218 } 219 } 220 221 222 void BlockListBuilder::set_leaders() { 223 bool has_xhandlers = xhandlers()->has_handlers(); 224 BlockBegin* current = NULL; 225 226 // The information which bci starts a new block simplifies the analysis 227 // Without it, backward branches could jump to a bci where no block was created 228 // during bytecode iteration. This would require the creation of a new block at the 229 // branch target and a modification of the successor lists. 230 const BitMap& bci_block_start = method()->bci_block_start(); 231 232 ciBytecodeStream s(method()); 233 while (s.next() != ciBytecodeStream::EOBC()) { 234 int cur_bci = s.cur_bci(); 235 236 if (bci_block_start.at(cur_bci)) { 237 current = make_block_at(cur_bci, current); 238 } 239 assert(current != NULL, "must have current block"); 240 241 if (has_xhandlers && GraphBuilder::can_trap(method(), s.cur_bc())) { 242 handle_exceptions(current, cur_bci); 243 } 244 245 switch (s.cur_bc()) { 246 // track stores to local variables for selective creation of phi functions 247 case Bytecodes::_iinc: store_one(current, s.get_index()); break; 248 case Bytecodes::_istore: store_one(current, s.get_index()); break; 249 case Bytecodes::_lstore: store_two(current, s.get_index()); break; 250 case Bytecodes::_fstore: store_one(current, s.get_index()); break; 251 case Bytecodes::_dstore: store_two(current, s.get_index()); break; 252 case Bytecodes::_astore: store_one(current, s.get_index()); break; 253 case Bytecodes::_istore_0: store_one(current, 0); break; 254 case Bytecodes::_istore_1: store_one(current, 1); break; 255 case Bytecodes::_istore_2: store_one(current, 2); break; 256 case Bytecodes::_istore_3: store_one(current, 3); break; 257 case Bytecodes::_lstore_0: store_two(current, 0); break; 258 case Bytecodes::_lstore_1: store_two(current, 1); break; 259 case Bytecodes::_lstore_2: store_two(current, 2); break; 260 case Bytecodes::_lstore_3: store_two(current, 3); break; 261 case Bytecodes::_fstore_0: store_one(current, 0); break; 262 case Bytecodes::_fstore_1: store_one(current, 1); break; 263 case Bytecodes::_fstore_2: store_one(current, 2); break; 264 case Bytecodes::_fstore_3: store_one(current, 3); break; 265 case Bytecodes::_dstore_0: store_two(current, 0); break; 266 case Bytecodes::_dstore_1: store_two(current, 1); break; 267 case Bytecodes::_dstore_2: store_two(current, 2); break; 268 case Bytecodes::_dstore_3: store_two(current, 3); break; 269 case Bytecodes::_astore_0: store_one(current, 0); break; 270 case Bytecodes::_astore_1: store_one(current, 1); break; 271 case Bytecodes::_astore_2: store_one(current, 2); break; 272 case Bytecodes::_astore_3: store_one(current, 3); break; 273 274 // track bytecodes that affect the control flow 275 case Bytecodes::_athrow: // fall through 276 case Bytecodes::_ret: // fall through 277 case Bytecodes::_ireturn: // fall through 278 case Bytecodes::_lreturn: // fall through 279 case Bytecodes::_freturn: // fall through 280 case Bytecodes::_dreturn: // fall through 281 case Bytecodes::_areturn: // fall through 282 case Bytecodes::_return: 283 current = NULL; 284 break; 285 286 case Bytecodes::_ifeq: // fall through 287 case Bytecodes::_ifne: // fall through 288 case Bytecodes::_iflt: // fall through 289 case Bytecodes::_ifge: // fall through 290 case Bytecodes::_ifgt: // fall through 291 case Bytecodes::_ifle: // fall through 292 case Bytecodes::_if_icmpeq: // fall through 293 case Bytecodes::_if_icmpne: // fall through 294 case Bytecodes::_if_icmplt: // fall through 295 case Bytecodes::_if_icmpge: // fall through 296 case Bytecodes::_if_icmpgt: // fall through 297 case Bytecodes::_if_icmple: // fall through 298 case Bytecodes::_if_acmpeq: // fall through 299 case Bytecodes::_if_acmpne: // fall through 300 case Bytecodes::_ifnull: // fall through 301 case Bytecodes::_ifnonnull: 302 make_block_at(s.next_bci(), current); 303 make_block_at(s.get_dest(), current); 304 current = NULL; 305 break; 306 307 case Bytecodes::_goto: 308 make_block_at(s.get_dest(), current); 309 current = NULL; 310 break; 311 312 case Bytecodes::_goto_w: 313 make_block_at(s.get_far_dest(), current); 314 current = NULL; 315 break; 316 317 case Bytecodes::_jsr: 318 handle_jsr(current, s.get_dest(), s.next_bci()); 319 current = NULL; 320 break; 321 322 case Bytecodes::_jsr_w: 323 handle_jsr(current, s.get_far_dest(), s.next_bci()); 324 current = NULL; 325 break; 326 327 case Bytecodes::_tableswitch: { 328 // set block for each case 329 Bytecode_tableswitch sw(&s); 330 int l = sw.length(); 331 for (int i = 0; i < l; i++) { 332 make_block_at(cur_bci + sw.dest_offset_at(i), current); 333 } 334 make_block_at(cur_bci + sw.default_offset(), current); 335 current = NULL; 336 break; 337 } 338 339 case Bytecodes::_lookupswitch: { 340 // set block for each case 341 Bytecode_lookupswitch sw(&s); 342 int l = sw.number_of_pairs(); 343 for (int i = 0; i < l; i++) { 344 make_block_at(cur_bci + sw.pair_at(i).offset(), current); 345 } 346 make_block_at(cur_bci + sw.default_offset(), current); 347 current = NULL; 348 break; 349 } 350 351 default: 352 break; 353 } 354 } 355 } 356 357 358 void BlockListBuilder::mark_loops() { 359 ResourceMark rm; 360 361 _active.initialize(BlockBegin::number_of_blocks()); 362 _visited.initialize(BlockBegin::number_of_blocks()); 363 _loop_map = intArray(BlockBegin::number_of_blocks(), BlockBegin::number_of_blocks(), 0); 364 _next_loop_index = 0; 365 _next_block_number = _blocks.length(); 366 367 // recursively iterate the control flow graph 368 mark_loops(_bci2block->at(0), false); 369 assert(_next_block_number >= 0, "invalid block numbers"); 370 371 // Remove dangling Resource pointers before the ResourceMark goes out-of-scope. 372 _active.resize(0); 373 _visited.resize(0); 374 } 375 376 void BlockListBuilder::make_loop_header(BlockBegin* block) { 377 if (block->is_set(BlockBegin::exception_entry_flag)) { 378 // exception edges may look like loops but don't mark them as such 379 // since it screws up block ordering. 380 return; 381 } 382 if (!block->is_set(BlockBegin::parser_loop_header_flag)) { 383 block->set(BlockBegin::parser_loop_header_flag); 384 385 assert(_loop_map.at(block->block_id()) == 0, "must not be set yet"); 386 assert(0 <= _next_loop_index && _next_loop_index < BitsPerInt, "_next_loop_index is used as a bit-index in integer"); 387 _loop_map.at_put(block->block_id(), 1 << _next_loop_index); 388 if (_next_loop_index < 31) _next_loop_index++; 389 } else { 390 // block already marked as loop header 391 assert(is_power_of_2((unsigned int)_loop_map.at(block->block_id())), "exactly one bit must be set"); 392 } 393 } 394 395 int BlockListBuilder::mark_loops(BlockBegin* block, bool in_subroutine) { 396 int block_id = block->block_id(); 397 398 if (_visited.at(block_id)) { 399 if (_active.at(block_id)) { 400 // reached block via backward branch 401 make_loop_header(block); 402 } 403 // return cached loop information for this block 404 return _loop_map.at(block_id); 405 } 406 407 if (block->is_set(BlockBegin::subroutine_entry_flag)) { 408 in_subroutine = true; 409 } 410 411 // set active and visited bits before successors are processed 412 _visited.set_bit(block_id); 413 _active.set_bit(block_id); 414 415 intptr_t loop_state = 0; 416 for (int i = block->number_of_sux() - 1; i >= 0; i--) { 417 // recursively process all successors 418 loop_state |= mark_loops(block->sux_at(i), in_subroutine); 419 } 420 421 // clear active-bit after all successors are processed 422 _active.clear_bit(block_id); 423 424 // reverse-post-order numbering of all blocks 425 block->set_depth_first_number(_next_block_number); 426 _next_block_number--; 427 428 if (loop_state != 0 || in_subroutine ) { 429 // block is contained at least in one loop, so phi functions are necessary 430 // phi functions are also necessary for all locals stored in a subroutine 431 scope()->requires_phi_function().set_union(block->stores_to_locals()); 432 } 433 434 if (block->is_set(BlockBegin::parser_loop_header_flag)) { 435 int header_loop_state = _loop_map.at(block_id); 436 assert(is_power_of_2((unsigned)header_loop_state), "exactly one bit must be set"); 437 438 // If the highest bit is set (i.e. when integer value is negative), the method 439 // has 32 or more loops. This bit is never cleared because it is used for multiple loops 440 if (header_loop_state >= 0) { 441 clear_bits(loop_state, header_loop_state); 442 } 443 } 444 445 // cache and return loop information for this block 446 _loop_map.at_put(block_id, loop_state); 447 return loop_state; 448 } 449 450 451 #ifndef PRODUCT 452 453 int compare_depth_first(BlockBegin** a, BlockBegin** b) { 454 return (*a)->depth_first_number() - (*b)->depth_first_number(); 455 } 456 457 void BlockListBuilder::print() { 458 tty->print("----- initial block list of BlockListBuilder for method "); 459 method()->print_short_name(); 460 tty->cr(); 461 462 // better readability if blocks are sorted in processing order 463 _blocks.sort(compare_depth_first); 464 465 for (int i = 0; i < _blocks.length(); i++) { 466 BlockBegin* cur = _blocks.at(i); 467 tty->print("%4d: B%-4d bci: %-4d preds: %-4d ", cur->depth_first_number(), cur->block_id(), cur->bci(), cur->total_preds()); 468 469 tty->print(cur->is_set(BlockBegin::std_entry_flag) ? " std" : " "); 470 tty->print(cur->is_set(BlockBegin::osr_entry_flag) ? " osr" : " "); 471 tty->print(cur->is_set(BlockBegin::exception_entry_flag) ? " ex" : " "); 472 tty->print(cur->is_set(BlockBegin::subroutine_entry_flag) ? " sr" : " "); 473 tty->print(cur->is_set(BlockBegin::parser_loop_header_flag) ? " lh" : " "); 474 475 if (cur->number_of_sux() > 0) { 476 tty->print(" sux: "); 477 for (int j = 0; j < cur->number_of_sux(); j++) { 478 BlockBegin* sux = cur->sux_at(j); 479 tty->print("B%d ", sux->block_id()); 480 } 481 } 482 tty->cr(); 483 } 484 } 485 486 #endif 487 488 489 // A simple growable array of Values indexed by ciFields 490 class FieldBuffer: public CompilationResourceObj { 491 private: 492 GrowableArray<Value> _values; 493 494 public: 495 FieldBuffer() {} 496 497 void kill() { 498 _values.trunc_to(0); 499 } 500 501 Value at(ciField* field) { 502 assert(field->holder()->is_loaded(), "must be a loaded field"); 503 int offset = field->offset(); 504 if (offset < _values.length()) { 505 return _values.at(offset); 506 } else { 507 return NULL; 508 } 509 } 510 511 void at_put(ciField* field, Value value) { 512 assert(field->holder()->is_loaded(), "must be a loaded field"); 513 int offset = field->offset(); 514 _values.at_put_grow(offset, value, NULL); 515 } 516 517 }; 518 519 520 // MemoryBuffer is fairly simple model of the current state of memory. 521 // It partitions memory into several pieces. The first piece is 522 // generic memory where little is known about the owner of the memory. 523 // This is conceptually represented by the tuple <O, F, V> which says 524 // that the field F of object O has value V. This is flattened so 525 // that F is represented by the offset of the field and the parallel 526 // arrays _objects and _values are used for O and V. Loads of O.F can 527 // simply use V. Newly allocated objects are kept in a separate list 528 // along with a parallel array for each object which represents the 529 // current value of its fields. Stores of the default value to fields 530 // which have never been stored to before are eliminated since they 531 // are redundant. Once newly allocated objects are stored into 532 // another object or they are passed out of the current compile they 533 // are treated like generic memory. 534 535 class MemoryBuffer: public CompilationResourceObj { 536 private: 537 FieldBuffer _values; 538 GrowableArray<Value> _objects; 539 GrowableArray<Value> _newobjects; 540 GrowableArray<FieldBuffer*> _fields; 541 542 public: 543 MemoryBuffer() {} 544 545 StoreField* store(StoreField* st) { 546 if (!EliminateFieldAccess) { 547 return st; 548 } 549 550 Value object = st->obj(); 551 Value value = st->value(); 552 ciField* field = st->field(); 553 if (field->holder()->is_loaded()) { 554 int offset = field->offset(); 555 int index = _newobjects.find(object); 556 if (index != -1) { 557 // newly allocated object with no other stores performed on this field 558 FieldBuffer* buf = _fields.at(index); 559 if (buf->at(field) == NULL && is_default_value(value)) { 560 #ifndef PRODUCT 561 if (PrintIRDuringConstruction && Verbose) { 562 tty->print_cr("Eliminated store for object %d:", index); 563 st->print_line(); 564 } 565 #endif 566 return NULL; 567 } else { 568 buf->at_put(field, value); 569 } 570 } else { 571 _objects.at_put_grow(offset, object, NULL); 572 _values.at_put(field, value); 573 } 574 575 store_value(value); 576 } else { 577 // if we held onto field names we could alias based on names but 578 // we don't know what's being stored to so kill it all. 579 kill(); 580 } 581 return st; 582 } 583 584 585 // return true if this value correspond to the default value of a field. 586 bool is_default_value(Value value) { 587 Constant* con = value->as_Constant(); 588 if (con) { 589 switch (con->type()->tag()) { 590 case intTag: return con->type()->as_IntConstant()->value() == 0; 591 case longTag: return con->type()->as_LongConstant()->value() == 0; 592 case floatTag: return jint_cast(con->type()->as_FloatConstant()->value()) == 0; 593 case doubleTag: return jlong_cast(con->type()->as_DoubleConstant()->value()) == jlong_cast(0); 594 case objectTag: return con->type() == objectNull; 595 default: ShouldNotReachHere(); 596 } 597 } 598 return false; 599 } 600 601 602 // return either the actual value of a load or the load itself 603 Value load(LoadField* load) { 604 if (!EliminateFieldAccess) { 605 return load; 606 } 607 608 if (RoundFPResults && UseSSE < 2 && load->type()->is_float_kind()) { 609 // can't skip load since value might get rounded as a side effect 610 return load; 611 } 612 613 ciField* field = load->field(); 614 Value object = load->obj(); 615 if (field->holder()->is_loaded() && !field->is_volatile()) { 616 int offset = field->offset(); 617 Value result = NULL; 618 int index = _newobjects.find(object); 619 if (index != -1) { 620 result = _fields.at(index)->at(field); 621 } else if (_objects.at_grow(offset, NULL) == object) { 622 result = _values.at(field); 623 } 624 if (result != NULL) { 625 #ifndef PRODUCT 626 if (PrintIRDuringConstruction && Verbose) { 627 tty->print_cr("Eliminated load: "); 628 load->print_line(); 629 } 630 #endif 631 assert(result->type()->tag() == load->type()->tag(), "wrong types"); 632 return result; 633 } 634 } 635 return load; 636 } 637 638 // Record this newly allocated object 639 void new_instance(NewInstance* object) { 640 int index = _newobjects.length(); 641 _newobjects.append(object); 642 if (_fields.at_grow(index, NULL) == NULL) { 643 _fields.at_put(index, new FieldBuffer()); 644 } else { 645 _fields.at(index)->kill(); 646 } 647 } 648 649 void store_value(Value value) { 650 int index = _newobjects.find(value); 651 if (index != -1) { 652 // stored a newly allocated object into another object. 653 // Assume we've lost track of it as separate slice of memory. 654 // We could do better by keeping track of whether individual 655 // fields could alias each other. 656 _newobjects.remove_at(index); 657 // pull out the field info and store it at the end up the list 658 // of field info list to be reused later. 659 _fields.append(_fields.at(index)); 660 _fields.remove_at(index); 661 } 662 } 663 664 void kill() { 665 _newobjects.trunc_to(0); 666 _objects.trunc_to(0); 667 _values.kill(); 668 } 669 }; 670 671 672 // Implementation of GraphBuilder's ScopeData 673 674 GraphBuilder::ScopeData::ScopeData(ScopeData* parent) 675 : _parent(parent) 676 , _bci2block(NULL) 677 , _scope(NULL) 678 , _has_handler(false) 679 , _stream(NULL) 680 , _work_list(NULL) 681 , _parsing_jsr(false) 682 , _jsr_xhandlers(NULL) 683 , _caller_stack_size(-1) 684 , _continuation(NULL) 685 , _num_returns(0) 686 , _cleanup_block(NULL) 687 , _cleanup_return_prev(NULL) 688 , _cleanup_state(NULL) 689 , _ignore_return(false) 690 { 691 if (parent != NULL) { 692 _max_inline_size = (intx) ((float) NestedInliningSizeRatio * (float) parent->max_inline_size() / 100.0f); 693 } else { 694 _max_inline_size = MaxInlineSize; 695 } 696 if (_max_inline_size < MaxTrivialSize) { 697 _max_inline_size = MaxTrivialSize; 698 } 699 } 700 701 702 void GraphBuilder::kill_all() { 703 if (UseLocalValueNumbering) { 704 vmap()->kill_all(); 705 } 706 _memory->kill(); 707 } 708 709 710 BlockBegin* GraphBuilder::ScopeData::block_at(int bci) { 711 if (parsing_jsr()) { 712 // It is necessary to clone all blocks associated with a 713 // subroutine, including those for exception handlers in the scope 714 // of the method containing the jsr (because those exception 715 // handlers may contain ret instructions in some cases). 716 BlockBegin* block = bci2block()->at(bci); 717 if (block != NULL && block == parent()->bci2block()->at(bci)) { 718 BlockBegin* new_block = new BlockBegin(block->bci()); 719 if (PrintInitialBlockList) { 720 tty->print_cr("CFG: cloned block %d (bci %d) as block %d for jsr", 721 block->block_id(), block->bci(), new_block->block_id()); 722 } 723 // copy data from cloned blocked 724 new_block->set_depth_first_number(block->depth_first_number()); 725 if (block->is_set(BlockBegin::parser_loop_header_flag)) new_block->set(BlockBegin::parser_loop_header_flag); 726 // Preserve certain flags for assertion checking 727 if (block->is_set(BlockBegin::subroutine_entry_flag)) new_block->set(BlockBegin::subroutine_entry_flag); 728 if (block->is_set(BlockBegin::exception_entry_flag)) new_block->set(BlockBegin::exception_entry_flag); 729 730 // copy was_visited_flag to allow early detection of bailouts 731 // if a block that is used in a jsr has already been visited before, 732 // it is shared between the normal control flow and a subroutine 733 // BlockBegin::try_merge returns false when the flag is set, this leads 734 // to a compilation bailout 735 if (block->is_set(BlockBegin::was_visited_flag)) new_block->set(BlockBegin::was_visited_flag); 736 737 bci2block()->at_put(bci, new_block); 738 block = new_block; 739 } 740 return block; 741 } else { 742 return bci2block()->at(bci); 743 } 744 } 745 746 747 XHandlers* GraphBuilder::ScopeData::xhandlers() const { 748 if (_jsr_xhandlers == NULL) { 749 assert(!parsing_jsr(), ""); 750 return scope()->xhandlers(); 751 } 752 assert(parsing_jsr(), ""); 753 return _jsr_xhandlers; 754 } 755 756 757 void GraphBuilder::ScopeData::set_scope(IRScope* scope) { 758 _scope = scope; 759 bool parent_has_handler = false; 760 if (parent() != NULL) { 761 parent_has_handler = parent()->has_handler(); 762 } 763 _has_handler = parent_has_handler || scope->xhandlers()->has_handlers(); 764 } 765 766 767 void GraphBuilder::ScopeData::set_inline_cleanup_info(BlockBegin* block, 768 Instruction* return_prev, 769 ValueStack* return_state) { 770 _cleanup_block = block; 771 _cleanup_return_prev = return_prev; 772 _cleanup_state = return_state; 773 } 774 775 776 void GraphBuilder::ScopeData::add_to_work_list(BlockBegin* block) { 777 if (_work_list == NULL) { 778 _work_list = new BlockList(); 779 } 780 781 if (!block->is_set(BlockBegin::is_on_work_list_flag)) { 782 // Do not start parsing the continuation block while in a 783 // sub-scope 784 if (parsing_jsr()) { 785 if (block == jsr_continuation()) { 786 return; 787 } 788 } else { 789 if (block == continuation()) { 790 return; 791 } 792 } 793 block->set(BlockBegin::is_on_work_list_flag); 794 _work_list->push(block); 795 796 sort_top_into_worklist(_work_list, block); 797 } 798 } 799 800 801 void GraphBuilder::sort_top_into_worklist(BlockList* worklist, BlockBegin* top) { 802 assert(worklist->top() == top, ""); 803 // sort block descending into work list 804 const int dfn = top->depth_first_number(); 805 assert(dfn != -1, "unknown depth first number"); 806 int i = worklist->length()-2; 807 while (i >= 0) { 808 BlockBegin* b = worklist->at(i); 809 if (b->depth_first_number() < dfn) { 810 worklist->at_put(i+1, b); 811 } else { 812 break; 813 } 814 i --; 815 } 816 if (i >= -1) worklist->at_put(i + 1, top); 817 } 818 819 820 BlockBegin* GraphBuilder::ScopeData::remove_from_work_list() { 821 if (is_work_list_empty()) { 822 return NULL; 823 } 824 return _work_list->pop(); 825 } 826 827 828 bool GraphBuilder::ScopeData::is_work_list_empty() const { 829 return (_work_list == NULL || _work_list->length() == 0); 830 } 831 832 833 void GraphBuilder::ScopeData::setup_jsr_xhandlers() { 834 assert(parsing_jsr(), ""); 835 // clone all the exception handlers from the scope 836 XHandlers* handlers = new XHandlers(scope()->xhandlers()); 837 const int n = handlers->length(); 838 for (int i = 0; i < n; i++) { 839 // The XHandlers need to be adjusted to dispatch to the cloned 840 // handler block instead of the default one but the synthetic 841 // unlocker needs to be handled specially. The synthetic unlocker 842 // should be left alone since there can be only one and all code 843 // should dispatch to the same one. 844 XHandler* h = handlers->handler_at(i); 845 assert(h->handler_bci() != SynchronizationEntryBCI, "must be real"); 846 h->set_entry_block(block_at(h->handler_bci())); 847 } 848 _jsr_xhandlers = handlers; 849 } 850 851 852 int GraphBuilder::ScopeData::num_returns() { 853 if (parsing_jsr()) { 854 return parent()->num_returns(); 855 } 856 return _num_returns; 857 } 858 859 860 void GraphBuilder::ScopeData::incr_num_returns() { 861 if (parsing_jsr()) { 862 parent()->incr_num_returns(); 863 } else { 864 ++_num_returns; 865 } 866 } 867 868 869 // Implementation of GraphBuilder 870 871 #define INLINE_BAILOUT(msg) { inline_bailout(msg); return false; } 872 873 874 void GraphBuilder::load_constant() { 875 ciConstant con = stream()->get_constant(); 876 if (con.basic_type() == T_ILLEGAL) { 877 BAILOUT("could not resolve a constant"); 878 } else { 879 ValueType* t = illegalType; 880 ValueStack* patch_state = NULL; 881 switch (con.basic_type()) { 882 case T_BOOLEAN: t = new IntConstant (con.as_boolean()); break; 883 case T_BYTE : t = new IntConstant (con.as_byte ()); break; 884 case T_CHAR : t = new IntConstant (con.as_char ()); break; 885 case T_SHORT : t = new IntConstant (con.as_short ()); break; 886 case T_INT : t = new IntConstant (con.as_int ()); break; 887 case T_LONG : t = new LongConstant (con.as_long ()); break; 888 case T_FLOAT : t = new FloatConstant (con.as_float ()); break; 889 case T_DOUBLE : t = new DoubleConstant (con.as_double ()); break; 890 case T_ARRAY : t = new ArrayConstant (con.as_object ()->as_array ()); break; 891 case T_OBJECT : 892 { 893 ciObject* obj = con.as_object(); 894 if (!obj->is_loaded() 895 || (PatchALot && obj->klass() != ciEnv::current()->String_klass())) { 896 patch_state = copy_state_before(); 897 t = new ObjectConstant(obj); 898 } else { 899 assert(obj->is_instance(), "must be java_mirror of klass"); 900 t = new InstanceConstant(obj->as_instance()); 901 } 902 break; 903 } 904 default : ShouldNotReachHere(); 905 } 906 Value x; 907 if (patch_state != NULL) { 908 x = new Constant(t, patch_state); 909 } else { 910 x = new Constant(t); 911 } 912 push(t, append(x)); 913 } 914 } 915 916 917 void GraphBuilder::load_local(ValueType* type, int index) { 918 Value x = state()->local_at(index); 919 assert(x != NULL && !x->type()->is_illegal(), "access of illegal local variable"); 920 push(type, x); 921 } 922 923 924 void GraphBuilder::store_local(ValueType* type, int index) { 925 Value x = pop(type); 926 store_local(state(), x, index); 927 } 928 929 930 void GraphBuilder::store_local(ValueStack* state, Value x, int index) { 931 if (parsing_jsr()) { 932 // We need to do additional tracking of the location of the return 933 // address for jsrs since we don't handle arbitrary jsr/ret 934 // constructs. Here we are figuring out in which circumstances we 935 // need to bail out. 936 if (x->type()->is_address()) { 937 scope_data()->set_jsr_return_address_local(index); 938 939 // Also check parent jsrs (if any) at this time to see whether 940 // they are using this local. We don't handle skipping over a 941 // ret. 942 for (ScopeData* cur_scope_data = scope_data()->parent(); 943 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope(); 944 cur_scope_data = cur_scope_data->parent()) { 945 if (cur_scope_data->jsr_return_address_local() == index) { 946 BAILOUT("subroutine overwrites return address from previous subroutine"); 947 } 948 } 949 } else if (index == scope_data()->jsr_return_address_local()) { 950 scope_data()->set_jsr_return_address_local(-1); 951 } 952 } 953 954 state->store_local(index, round_fp(x)); 955 } 956 957 958 void GraphBuilder::load_indexed(BasicType type) { 959 // In case of in block code motion in range check elimination 960 ValueStack* state_before = copy_state_indexed_access(); 961 compilation()->set_has_access_indexed(true); 962 Value index = ipop(); 963 Value array = apop(); 964 Value length = NULL; 965 if (CSEArrayLength || 966 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) || 967 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) { 968 length = append(new ArrayLength(array, state_before)); 969 } 970 push(as_ValueType(type), append(new LoadIndexed(array, index, length, type, state_before))); 971 } 972 973 974 void GraphBuilder::store_indexed(BasicType type) { 975 // In case of in block code motion in range check elimination 976 ValueStack* state_before = copy_state_indexed_access(); 977 compilation()->set_has_access_indexed(true); 978 Value value = pop(as_ValueType(type)); 979 Value index = ipop(); 980 Value array = apop(); 981 Value length = NULL; 982 if (CSEArrayLength || 983 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) || 984 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) { 985 length = append(new ArrayLength(array, state_before)); 986 } 987 ciType* array_type = array->declared_type(); 988 bool check_boolean = false; 989 if (array_type != NULL) { 990 if (array_type->is_loaded() && 991 array_type->as_array_klass()->element_type()->basic_type() == T_BOOLEAN) { 992 assert(type == T_BYTE, "boolean store uses bastore"); 993 Value mask = append(new Constant(new IntConstant(1))); 994 value = append(new LogicOp(Bytecodes::_iand, value, mask)); 995 } 996 } else if (type == T_BYTE) { 997 check_boolean = true; 998 } 999 StoreIndexed* result = new StoreIndexed(array, index, length, type, value, state_before, check_boolean); 1000 append(result); 1001 _memory->store_value(value); 1002 1003 if (type == T_OBJECT && is_profiling()) { 1004 // Note that we'd collect profile data in this method if we wanted it. 1005 compilation()->set_would_profile(true); 1006 1007 if (profile_checkcasts()) { 1008 result->set_profiled_method(method()); 1009 result->set_profiled_bci(bci()); 1010 result->set_should_profile(true); 1011 } 1012 } 1013 } 1014 1015 1016 void GraphBuilder::stack_op(Bytecodes::Code code) { 1017 switch (code) { 1018 case Bytecodes::_pop: 1019 { state()->raw_pop(); 1020 } 1021 break; 1022 case Bytecodes::_pop2: 1023 { state()->raw_pop(); 1024 state()->raw_pop(); 1025 } 1026 break; 1027 case Bytecodes::_dup: 1028 { Value w = state()->raw_pop(); 1029 state()->raw_push(w); 1030 state()->raw_push(w); 1031 } 1032 break; 1033 case Bytecodes::_dup_x1: 1034 { Value w1 = state()->raw_pop(); 1035 Value w2 = state()->raw_pop(); 1036 state()->raw_push(w1); 1037 state()->raw_push(w2); 1038 state()->raw_push(w1); 1039 } 1040 break; 1041 case Bytecodes::_dup_x2: 1042 { Value w1 = state()->raw_pop(); 1043 Value w2 = state()->raw_pop(); 1044 Value w3 = state()->raw_pop(); 1045 state()->raw_push(w1); 1046 state()->raw_push(w3); 1047 state()->raw_push(w2); 1048 state()->raw_push(w1); 1049 } 1050 break; 1051 case Bytecodes::_dup2: 1052 { Value w1 = state()->raw_pop(); 1053 Value w2 = state()->raw_pop(); 1054 state()->raw_push(w2); 1055 state()->raw_push(w1); 1056 state()->raw_push(w2); 1057 state()->raw_push(w1); 1058 } 1059 break; 1060 case Bytecodes::_dup2_x1: 1061 { Value w1 = state()->raw_pop(); 1062 Value w2 = state()->raw_pop(); 1063 Value w3 = state()->raw_pop(); 1064 state()->raw_push(w2); 1065 state()->raw_push(w1); 1066 state()->raw_push(w3); 1067 state()->raw_push(w2); 1068 state()->raw_push(w1); 1069 } 1070 break; 1071 case Bytecodes::_dup2_x2: 1072 { Value w1 = state()->raw_pop(); 1073 Value w2 = state()->raw_pop(); 1074 Value w3 = state()->raw_pop(); 1075 Value w4 = state()->raw_pop(); 1076 state()->raw_push(w2); 1077 state()->raw_push(w1); 1078 state()->raw_push(w4); 1079 state()->raw_push(w3); 1080 state()->raw_push(w2); 1081 state()->raw_push(w1); 1082 } 1083 break; 1084 case Bytecodes::_swap: 1085 { Value w1 = state()->raw_pop(); 1086 Value w2 = state()->raw_pop(); 1087 state()->raw_push(w1); 1088 state()->raw_push(w2); 1089 } 1090 break; 1091 default: 1092 ShouldNotReachHere(); 1093 break; 1094 } 1095 } 1096 1097 1098 void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) { 1099 Value y = pop(type); 1100 Value x = pop(type); 1101 // NOTE: strictfp can be queried from current method since we don't 1102 // inline methods with differing strictfp bits 1103 Value res = new ArithmeticOp(code, x, y, method()->is_strict(), state_before); 1104 // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level 1105 res = append(res); 1106 if (method()->is_strict()) { 1107 res = round_fp(res); 1108 } 1109 push(type, res); 1110 } 1111 1112 1113 void GraphBuilder::negate_op(ValueType* type) { 1114 push(type, append(new NegateOp(pop(type)))); 1115 } 1116 1117 1118 void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) { 1119 Value s = ipop(); 1120 Value x = pop(type); 1121 // try to simplify 1122 // Note: This code should go into the canonicalizer as soon as it can 1123 // can handle canonicalized forms that contain more than one node. 1124 if (CanonicalizeNodes && code == Bytecodes::_iushr) { 1125 // pattern: x >>> s 1126 IntConstant* s1 = s->type()->as_IntConstant(); 1127 if (s1 != NULL) { 1128 // pattern: x >>> s1, with s1 constant 1129 ShiftOp* l = x->as_ShiftOp(); 1130 if (l != NULL && l->op() == Bytecodes::_ishl) { 1131 // pattern: (a << b) >>> s1 1132 IntConstant* s0 = l->y()->type()->as_IntConstant(); 1133 if (s0 != NULL) { 1134 // pattern: (a << s0) >>> s1 1135 const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts 1136 const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts 1137 if (s0c == s1c) { 1138 if (s0c == 0) { 1139 // pattern: (a << 0) >>> 0 => simplify to: a 1140 ipush(l->x()); 1141 } else { 1142 // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant 1143 assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases"); 1144 const int m = (1 << (BitsPerInt - s0c)) - 1; 1145 Value s = append(new Constant(new IntConstant(m))); 1146 ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s))); 1147 } 1148 return; 1149 } 1150 } 1151 } 1152 } 1153 } 1154 // could not simplify 1155 push(type, append(new ShiftOp(code, x, s))); 1156 } 1157 1158 1159 void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) { 1160 Value y = pop(type); 1161 Value x = pop(type); 1162 push(type, append(new LogicOp(code, x, y))); 1163 } 1164 1165 1166 void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) { 1167 ValueStack* state_before = copy_state_before(); 1168 Value y = pop(type); 1169 Value x = pop(type); 1170 ipush(append(new CompareOp(code, x, y, state_before))); 1171 } 1172 1173 1174 void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) { 1175 push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to)))); 1176 } 1177 1178 1179 void GraphBuilder::increment() { 1180 int index = stream()->get_index(); 1181 int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]); 1182 load_local(intType, index); 1183 ipush(append(new Constant(new IntConstant(delta)))); 1184 arithmetic_op(intType, Bytecodes::_iadd); 1185 store_local(intType, index); 1186 } 1187 1188 1189 void GraphBuilder::_goto(int from_bci, int to_bci) { 1190 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci); 1191 if (is_profiling()) { 1192 compilation()->set_would_profile(true); 1193 x->set_profiled_bci(bci()); 1194 if (profile_branches()) { 1195 x->set_profiled_method(method()); 1196 x->set_should_profile(true); 1197 } 1198 } 1199 append(x); 1200 } 1201 1202 1203 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) { 1204 BlockBegin* tsux = block_at(stream()->get_dest()); 1205 BlockBegin* fsux = block_at(stream()->next_bci()); 1206 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci(); 1207 // In case of loop invariant code motion or predicate insertion 1208 // before the body of a loop the state is needed 1209 Instruction *i = append(new If(x, cond, false, y, tsux, fsux, (is_bb || compilation()->is_optimistic()) ? state_before : NULL, is_bb)); 1210 1211 assert(i->as_Goto() == NULL || 1212 (i->as_Goto()->sux_at(0) == tsux && i->as_Goto()->is_safepoint() == tsux->bci() < stream()->cur_bci()) || 1213 (i->as_Goto()->sux_at(0) == fsux && i->as_Goto()->is_safepoint() == fsux->bci() < stream()->cur_bci()), 1214 "safepoint state of Goto returned by canonicalizer incorrect"); 1215 1216 if (is_profiling()) { 1217 If* if_node = i->as_If(); 1218 if (if_node != NULL) { 1219 // Note that we'd collect profile data in this method if we wanted it. 1220 compilation()->set_would_profile(true); 1221 // At level 2 we need the proper bci to count backedges 1222 if_node->set_profiled_bci(bci()); 1223 if (profile_branches()) { 1224 // Successors can be rotated by the canonicalizer, check for this case. 1225 if_node->set_profiled_method(method()); 1226 if_node->set_should_profile(true); 1227 if (if_node->tsux() == fsux) { 1228 if_node->set_swapped(true); 1229 } 1230 } 1231 return; 1232 } 1233 1234 // Check if this If was reduced to Goto. 1235 Goto *goto_node = i->as_Goto(); 1236 if (goto_node != NULL) { 1237 compilation()->set_would_profile(true); 1238 goto_node->set_profiled_bci(bci()); 1239 if (profile_branches()) { 1240 goto_node->set_profiled_method(method()); 1241 goto_node->set_should_profile(true); 1242 // Find out which successor is used. 1243 if (goto_node->default_sux() == tsux) { 1244 goto_node->set_direction(Goto::taken); 1245 } else if (goto_node->default_sux() == fsux) { 1246 goto_node->set_direction(Goto::not_taken); 1247 } else { 1248 ShouldNotReachHere(); 1249 } 1250 } 1251 return; 1252 } 1253 } 1254 } 1255 1256 1257 void GraphBuilder::if_zero(ValueType* type, If::Condition cond) { 1258 Value y = append(new Constant(intZero)); 1259 ValueStack* state_before = copy_state_before(); 1260 Value x = ipop(); 1261 if_node(x, cond, y, state_before); 1262 } 1263 1264 1265 void GraphBuilder::if_null(ValueType* type, If::Condition cond) { 1266 Value y = append(new Constant(objectNull)); 1267 ValueStack* state_before = copy_state_before(); 1268 Value x = apop(); 1269 if_node(x, cond, y, state_before); 1270 } 1271 1272 1273 void GraphBuilder::if_same(ValueType* type, If::Condition cond) { 1274 ValueStack* state_before = copy_state_before(); 1275 Value y = pop(type); 1276 Value x = pop(type); 1277 if_node(x, cond, y, state_before); 1278 } 1279 1280 1281 void GraphBuilder::jsr(int dest) { 1282 // We only handle well-formed jsrs (those which are "block-structured"). 1283 // If the bytecodes are strange (jumping out of a jsr block) then we 1284 // might end up trying to re-parse a block containing a jsr which 1285 // has already been activated. Watch for this case and bail out. 1286 for (ScopeData* cur_scope_data = scope_data(); 1287 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope(); 1288 cur_scope_data = cur_scope_data->parent()) { 1289 if (cur_scope_data->jsr_entry_bci() == dest) { 1290 BAILOUT("too-complicated jsr/ret structure"); 1291 } 1292 } 1293 1294 push(addressType, append(new Constant(new AddressConstant(next_bci())))); 1295 if (!try_inline_jsr(dest)) { 1296 return; // bailed out while parsing and inlining subroutine 1297 } 1298 } 1299 1300 1301 void GraphBuilder::ret(int local_index) { 1302 if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine"); 1303 1304 if (local_index != scope_data()->jsr_return_address_local()) { 1305 BAILOUT("can not handle complicated jsr/ret constructs"); 1306 } 1307 1308 // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation 1309 append(new Goto(scope_data()->jsr_continuation(), false)); 1310 } 1311 1312 1313 void GraphBuilder::table_switch() { 1314 Bytecode_tableswitch sw(stream()); 1315 const int l = sw.length(); 1316 if (CanonicalizeNodes && l == 1) { 1317 // total of 2 successors => use If instead of switch 1318 // Note: This code should go into the canonicalizer as soon as it can 1319 // can handle canonicalized forms that contain more than one node. 1320 Value key = append(new Constant(new IntConstant(sw.low_key()))); 1321 BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0)); 1322 BlockBegin* fsux = block_at(bci() + sw.default_offset()); 1323 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci(); 1324 // In case of loop invariant code motion or predicate insertion 1325 // before the body of a loop the state is needed 1326 ValueStack* state_before = copy_state_if_bb(is_bb); 1327 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb)); 1328 } else { 1329 // collect successors 1330 BlockList* sux = new BlockList(l + 1, NULL); 1331 int i; 1332 bool has_bb = false; 1333 for (i = 0; i < l; i++) { 1334 sux->at_put(i, block_at(bci() + sw.dest_offset_at(i))); 1335 if (sw.dest_offset_at(i) < 0) has_bb = true; 1336 } 1337 // add default successor 1338 if (sw.default_offset() < 0) has_bb = true; 1339 sux->at_put(i, block_at(bci() + sw.default_offset())); 1340 // In case of loop invariant code motion or predicate insertion 1341 // before the body of a loop the state is needed 1342 ValueStack* state_before = copy_state_if_bb(has_bb); 1343 Instruction* res = append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb)); 1344 #ifdef ASSERT 1345 if (res->as_Goto()) { 1346 for (i = 0; i < l; i++) { 1347 if (sux->at(i) == res->as_Goto()->sux_at(0)) { 1348 assert(res->as_Goto()->is_safepoint() == sw.dest_offset_at(i) < 0, "safepoint state of Goto returned by canonicalizer incorrect"); 1349 } 1350 } 1351 } 1352 #endif 1353 } 1354 } 1355 1356 1357 void GraphBuilder::lookup_switch() { 1358 Bytecode_lookupswitch sw(stream()); 1359 const int l = sw.number_of_pairs(); 1360 if (CanonicalizeNodes && l == 1) { 1361 // total of 2 successors => use If instead of switch 1362 // Note: This code should go into the canonicalizer as soon as it can 1363 // can handle canonicalized forms that contain more than one node. 1364 // simplify to If 1365 LookupswitchPair pair = sw.pair_at(0); 1366 Value key = append(new Constant(new IntConstant(pair.match()))); 1367 BlockBegin* tsux = block_at(bci() + pair.offset()); 1368 BlockBegin* fsux = block_at(bci() + sw.default_offset()); 1369 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci(); 1370 // In case of loop invariant code motion or predicate insertion 1371 // before the body of a loop the state is needed 1372 ValueStack* state_before = copy_state_if_bb(is_bb);; 1373 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb)); 1374 } else { 1375 // collect successors & keys 1376 BlockList* sux = new BlockList(l + 1, NULL); 1377 intArray* keys = new intArray(l, l, 0); 1378 int i; 1379 bool has_bb = false; 1380 for (i = 0; i < l; i++) { 1381 LookupswitchPair pair = sw.pair_at(i); 1382 if (pair.offset() < 0) has_bb = true; 1383 sux->at_put(i, block_at(bci() + pair.offset())); 1384 keys->at_put(i, pair.match()); 1385 } 1386 // add default successor 1387 if (sw.default_offset() < 0) has_bb = true; 1388 sux->at_put(i, block_at(bci() + sw.default_offset())); 1389 // In case of loop invariant code motion or predicate insertion 1390 // before the body of a loop the state is needed 1391 ValueStack* state_before = copy_state_if_bb(has_bb); 1392 Instruction* res = append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb)); 1393 #ifdef ASSERT 1394 if (res->as_Goto()) { 1395 for (i = 0; i < l; i++) { 1396 if (sux->at(i) == res->as_Goto()->sux_at(0)) { 1397 assert(res->as_Goto()->is_safepoint() == sw.pair_at(i).offset() < 0, "safepoint state of Goto returned by canonicalizer incorrect"); 1398 } 1399 } 1400 } 1401 #endif 1402 } 1403 } 1404 1405 void GraphBuilder::call_register_finalizer() { 1406 // If the receiver requires finalization then emit code to perform 1407 // the registration on return. 1408 1409 // Gather some type information about the receiver 1410 Value receiver = state()->local_at(0); 1411 assert(receiver != NULL, "must have a receiver"); 1412 ciType* declared_type = receiver->declared_type(); 1413 ciType* exact_type = receiver->exact_type(); 1414 if (exact_type == NULL && 1415 receiver->as_Local() && 1416 receiver->as_Local()->java_index() == 0) { 1417 ciInstanceKlass* ik = compilation()->method()->holder(); 1418 if (ik->is_final()) { 1419 exact_type = ik; 1420 } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) { 1421 // test class is leaf class 1422 compilation()->dependency_recorder()->assert_leaf_type(ik); 1423 exact_type = ik; 1424 } else { 1425 declared_type = ik; 1426 } 1427 } 1428 1429 // see if we know statically that registration isn't required 1430 bool needs_check = true; 1431 if (exact_type != NULL) { 1432 needs_check = exact_type->as_instance_klass()->has_finalizer(); 1433 } else if (declared_type != NULL) { 1434 ciInstanceKlass* ik = declared_type->as_instance_klass(); 1435 if (!Dependencies::has_finalizable_subclass(ik)) { 1436 compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik); 1437 needs_check = false; 1438 } 1439 } 1440 1441 if (needs_check) { 1442 // Not a trivial method because C2 can do better with inlined check. 1443 compilation()->set_would_profile(true); 1444 1445 // Perform the registration of finalizable objects. 1446 ValueStack* state_before = copy_state_for_exception(); 1447 load_local(objectType, 0); 1448 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init, 1449 state()->pop_arguments(1), 1450 true, state_before, true)); 1451 } 1452 } 1453 1454 1455 void GraphBuilder::method_return(Value x, bool ignore_return) { 1456 if (RegisterFinalizersAtInit && 1457 method()->intrinsic_id() == vmIntrinsics::_Object_init) { 1458 call_register_finalizer(); 1459 } 1460 1461 bool need_mem_bar = false; 1462 if (method()->name() == ciSymbol::object_initializer_name() && 1463 (scope()->wrote_final() || (AlwaysSafeConstructors && scope()->wrote_fields()) 1464 || (support_IRIW_for_not_multiple_copy_atomic_cpu && scope()->wrote_volatile()) 1465 )){ 1466 need_mem_bar = true; 1467 } 1468 1469 BasicType bt = method()->return_type()->basic_type(); 1470 switch (bt) { 1471 case T_BYTE: 1472 { 1473 Value shift = append(new Constant(new IntConstant(24))); 1474 x = append(new ShiftOp(Bytecodes::_ishl, x, shift)); 1475 x = append(new ShiftOp(Bytecodes::_ishr, x, shift)); 1476 break; 1477 } 1478 case T_SHORT: 1479 { 1480 Value shift = append(new Constant(new IntConstant(16))); 1481 x = append(new ShiftOp(Bytecodes::_ishl, x, shift)); 1482 x = append(new ShiftOp(Bytecodes::_ishr, x, shift)); 1483 break; 1484 } 1485 case T_CHAR: 1486 { 1487 Value mask = append(new Constant(new IntConstant(0xFFFF))); 1488 x = append(new LogicOp(Bytecodes::_iand, x, mask)); 1489 break; 1490 } 1491 case T_BOOLEAN: 1492 { 1493 Value mask = append(new Constant(new IntConstant(1))); 1494 x = append(new LogicOp(Bytecodes::_iand, x, mask)); 1495 break; 1496 } 1497 default: 1498 break; 1499 } 1500 1501 // Check to see whether we are inlining. If so, Return 1502 // instructions become Gotos to the continuation point. 1503 if (continuation() != NULL) { 1504 1505 int invoke_bci = state()->caller_state()->bci(); 1506 1507 if (x != NULL && !ignore_return) { 1508 ciMethod* caller = state()->scope()->caller()->method(); 1509 Bytecodes::Code invoke_raw_bc = caller->raw_code_at_bci(invoke_bci); 1510 if (invoke_raw_bc == Bytecodes::_invokehandle || invoke_raw_bc == Bytecodes::_invokedynamic) { 1511 ciType* declared_ret_type = caller->get_declared_signature_at_bci(invoke_bci)->return_type(); 1512 if (declared_ret_type->is_klass() && x->exact_type() == NULL && 1513 x->declared_type() != declared_ret_type && declared_ret_type != compilation()->env()->Object_klass()) { 1514 x = append(new TypeCast(declared_ret_type->as_klass(), x, copy_state_before())); 1515 } 1516 } 1517 } 1518 1519 assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet"); 1520 1521 if (compilation()->env()->dtrace_method_probes()) { 1522 // Report exit from inline methods 1523 Values* args = new Values(1); 1524 args->push(append(new Constant(new MethodConstant(method())))); 1525 append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args)); 1526 } 1527 1528 // If the inlined method is synchronized, the monitor must be 1529 // released before we jump to the continuation block. 1530 if (method()->is_synchronized()) { 1531 assert(state()->locks_size() == 1, "receiver must be locked here"); 1532 monitorexit(state()->lock_at(0), SynchronizationEntryBCI); 1533 } 1534 1535 if (need_mem_bar) { 1536 append(new MemBar(lir_membar_storestore)); 1537 } 1538 1539 // State at end of inlined method is the state of the caller 1540 // without the method parameters on stack, including the 1541 // return value, if any, of the inlined method on operand stack. 1542 set_state(state()->caller_state()->copy_for_parsing()); 1543 if (x != NULL) { 1544 if (!ignore_return) { 1545 state()->push(x->type(), x); 1546 } 1547 if (profile_return() && x->type()->is_object_kind()) { 1548 ciMethod* caller = state()->scope()->method(); 1549 profile_return_type(x, method(), caller, invoke_bci); 1550 } 1551 } 1552 Goto* goto_callee = new Goto(continuation(), false); 1553 1554 // See whether this is the first return; if so, store off some 1555 // of the state for later examination 1556 if (num_returns() == 0) { 1557 set_inline_cleanup_info(); 1558 } 1559 1560 // The current bci() is in the wrong scope, so use the bci() of 1561 // the continuation point. 1562 append_with_bci(goto_callee, scope_data()->continuation()->bci()); 1563 incr_num_returns(); 1564 return; 1565 } 1566 1567 state()->truncate_stack(0); 1568 if (method()->is_synchronized()) { 1569 // perform the unlocking before exiting the method 1570 Value receiver; 1571 if (!method()->is_static()) { 1572 receiver = _initial_state->local_at(0); 1573 } else { 1574 receiver = append(new Constant(new ClassConstant(method()->holder()))); 1575 } 1576 append_split(new MonitorExit(receiver, state()->unlock())); 1577 } 1578 1579 if (need_mem_bar) { 1580 append(new MemBar(lir_membar_storestore)); 1581 } 1582 1583 assert(!ignore_return, "Ignoring return value works only for inlining"); 1584 append(new Return(x)); 1585 } 1586 1587 Value GraphBuilder::make_constant(ciConstant field_value, ciField* field) { 1588 if (!field_value.is_valid()) return NULL; 1589 1590 BasicType field_type = field_value.basic_type(); 1591 ValueType* value = as_ValueType(field_value); 1592 1593 // Attach dimension info to stable arrays. 1594 if (FoldStableValues && 1595 field->is_stable() && field_type == T_ARRAY && !field_value.is_null_or_zero()) { 1596 ciArray* array = field_value.as_object()->as_array(); 1597 jint dimension = field->type()->as_array_klass()->dimension(); 1598 value = new StableArrayConstant(array, dimension); 1599 } 1600 1601 switch (field_type) { 1602 case T_ARRAY: 1603 case T_OBJECT: 1604 if (field_value.as_object()->should_be_constant()) { 1605 return new Constant(value); 1606 } 1607 return NULL; // Not a constant. 1608 default: 1609 return new Constant(value); 1610 } 1611 } 1612 1613 void GraphBuilder::access_field(Bytecodes::Code code) { 1614 bool will_link; 1615 ciField* field = stream()->get_field(will_link); 1616 ciInstanceKlass* holder = field->holder(); 1617 BasicType field_type = field->type()->basic_type(); 1618 ValueType* type = as_ValueType(field_type); 1619 // call will_link again to determine if the field is valid. 1620 const bool needs_patching = !holder->is_loaded() || 1621 !field->will_link(method(), code) || 1622 PatchALot; 1623 1624 ValueStack* state_before = NULL; 1625 if (!holder->is_initialized() || needs_patching) { 1626 // save state before instruction for debug info when 1627 // deoptimization happens during patching 1628 state_before = copy_state_before(); 1629 } 1630 1631 Value obj = NULL; 1632 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) { 1633 if (state_before != NULL) { 1634 // build a patching constant 1635 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before); 1636 } else { 1637 obj = new Constant(new InstanceConstant(holder->java_mirror())); 1638 } 1639 } 1640 1641 if (field->is_final() && (code == Bytecodes::_putfield)) { 1642 scope()->set_wrote_final(); 1643 } 1644 1645 if (code == Bytecodes::_putfield) { 1646 scope()->set_wrote_fields(); 1647 if (field->is_volatile()) { 1648 scope()->set_wrote_volatile(); 1649 } 1650 } 1651 1652 const int offset = !needs_patching ? field->offset() : -1; 1653 switch (code) { 1654 case Bytecodes::_getstatic: { 1655 // check for compile-time constants, i.e., initialized static final fields 1656 Value constant = NULL; 1657 if (field->is_static_constant() && !PatchALot) { 1658 ciConstant field_value = field->constant_value(); 1659 assert(!field->is_stable() || !field_value.is_null_or_zero(), 1660 "stable static w/ default value shouldn't be a constant"); 1661 constant = make_constant(field_value, field); 1662 } 1663 if (constant != NULL) { 1664 push(type, append(constant)); 1665 } else { 1666 if (state_before == NULL) { 1667 state_before = copy_state_for_exception(); 1668 } 1669 push(type, append(new LoadField(append(obj), offset, field, true, 1670 state_before, needs_patching))); 1671 } 1672 break; 1673 } 1674 case Bytecodes::_putstatic: { 1675 Value val = pop(type); 1676 if (state_before == NULL) { 1677 state_before = copy_state_for_exception(); 1678 } 1679 if (field->type()->basic_type() == T_BOOLEAN) { 1680 Value mask = append(new Constant(new IntConstant(1))); 1681 val = append(new LogicOp(Bytecodes::_iand, val, mask)); 1682 } 1683 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching)); 1684 break; 1685 } 1686 case Bytecodes::_getfield: { 1687 // Check for compile-time constants, i.e., trusted final non-static fields. 1688 Value constant = NULL; 1689 obj = apop(); 1690 ObjectType* obj_type = obj->type()->as_ObjectType(); 1691 if (field->is_constant() && obj_type->is_constant() && !PatchALot) { 1692 ciObject* const_oop = obj_type->constant_value(); 1693 if (!const_oop->is_null_object() && const_oop->is_loaded()) { 1694 ciConstant field_value = field->constant_value_of(const_oop); 1695 if (field_value.is_valid()) { 1696 constant = make_constant(field_value, field); 1697 // For CallSite objects add a dependency for invalidation of the optimization. 1698 if (field->is_call_site_target()) { 1699 ciCallSite* call_site = const_oop->as_call_site(); 1700 if (!call_site->is_constant_call_site()) { 1701 ciMethodHandle* target = field_value.as_object()->as_method_handle(); 1702 dependency_recorder()->assert_call_site_target_value(call_site, target); 1703 } 1704 } 1705 } 1706 } 1707 } 1708 if (constant != NULL) { 1709 push(type, append(constant)); 1710 } else { 1711 if (state_before == NULL) { 1712 state_before = copy_state_for_exception(); 1713 } 1714 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching); 1715 Value replacement = !needs_patching ? _memory->load(load) : load; 1716 if (replacement != load) { 1717 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked"); 1718 push(type, replacement); 1719 } else { 1720 push(type, append(load)); 1721 } 1722 } 1723 break; 1724 } 1725 case Bytecodes::_putfield: { 1726 Value val = pop(type); 1727 obj = apop(); 1728 if (state_before == NULL) { 1729 state_before = copy_state_for_exception(); 1730 } 1731 if (field->type()->basic_type() == T_BOOLEAN) { 1732 Value mask = append(new Constant(new IntConstant(1))); 1733 val = append(new LogicOp(Bytecodes::_iand, val, mask)); 1734 } 1735 StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching); 1736 if (!needs_patching) store = _memory->store(store); 1737 if (store != NULL) { 1738 append(store); 1739 } 1740 break; 1741 } 1742 default: 1743 ShouldNotReachHere(); 1744 break; 1745 } 1746 } 1747 1748 1749 Dependencies* GraphBuilder::dependency_recorder() const { 1750 assert(DeoptC1, "need debug information"); 1751 return compilation()->dependency_recorder(); 1752 } 1753 1754 // How many arguments do we want to profile? 1755 Values* GraphBuilder::args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver) { 1756 int n = 0; 1757 bool has_receiver = may_have_receiver && Bytecodes::has_receiver(method()->java_code_at_bci(bci())); 1758 start = has_receiver ? 1 : 0; 1759 if (profile_arguments()) { 1760 ciProfileData* data = method()->method_data()->bci_to_data(bci()); 1761 if (data != NULL && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) { 1762 n = data->is_CallTypeData() ? data->as_CallTypeData()->number_of_arguments() : data->as_VirtualCallTypeData()->number_of_arguments(); 1763 } 1764 } 1765 // If we are inlining then we need to collect arguments to profile parameters for the target 1766 if (profile_parameters() && target != NULL) { 1767 if (target->method_data() != NULL && target->method_data()->parameters_type_data() != NULL) { 1768 // The receiver is profiled on method entry so it's included in 1769 // the number of parameters but here we're only interested in 1770 // actual arguments. 1771 n = MAX2(n, target->method_data()->parameters_type_data()->number_of_parameters() - start); 1772 } 1773 } 1774 if (n > 0) { 1775 return new Values(n); 1776 } 1777 return NULL; 1778 } 1779 1780 void GraphBuilder::check_args_for_profiling(Values* obj_args, int expected) { 1781 #ifdef ASSERT 1782 bool ignored_will_link; 1783 ciSignature* declared_signature = NULL; 1784 ciMethod* real_target = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature); 1785 assert(expected == obj_args->max_length() || real_target->is_method_handle_intrinsic(), "missed on arg?"); 1786 #endif 1787 } 1788 1789 // Collect arguments that we want to profile in a list 1790 Values* GraphBuilder::collect_args_for_profiling(Values* args, ciMethod* target, bool may_have_receiver) { 1791 int start = 0; 1792 Values* obj_args = args_list_for_profiling(target, start, may_have_receiver); 1793 if (obj_args == NULL) { 1794 return NULL; 1795 } 1796 int s = obj_args->max_length(); 1797 // if called through method handle invoke, some arguments may have been popped 1798 for (int i = start, j = 0; j < s && i < args->length(); i++) { 1799 if (args->at(i)->type()->is_object_kind()) { 1800 obj_args->push(args->at(i)); 1801 j++; 1802 } 1803 } 1804 check_args_for_profiling(obj_args, s); 1805 return obj_args; 1806 } 1807 1808 1809 void GraphBuilder::invoke(Bytecodes::Code code) { 1810 bool will_link; 1811 ciSignature* declared_signature = NULL; 1812 ciMethod* target = stream()->get_method(will_link, &declared_signature); 1813 ciKlass* holder = stream()->get_declared_method_holder(); 1814 const Bytecodes::Code bc_raw = stream()->cur_bc_raw(); 1815 assert(declared_signature != NULL, "cannot be null"); 1816 assert(will_link == target->is_loaded(), ""); 1817 1818 ciInstanceKlass* klass = target->holder(); 1819 assert(!target->is_loaded() || klass->is_loaded(), "loaded target must imply loaded klass"); 1820 1821 // check if CHA possible: if so, change the code to invoke_special 1822 ciInstanceKlass* calling_klass = method()->holder(); 1823 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); 1824 ciInstanceKlass* actual_recv = callee_holder; 1825 1826 CompileLog* log = compilation()->log(); 1827 if (log != NULL) 1828 log->elem("call method='%d' instr='%s'", 1829 log->identify(target), 1830 Bytecodes::name(code)); 1831 1832 // invoke-special-super 1833 if (bc_raw == Bytecodes::_invokespecial && !target->is_object_initializer()) { 1834 ciInstanceKlass* sender_klass = 1835 calling_klass->is_anonymous() ? calling_klass->host_klass() : 1836 calling_klass; 1837 if (sender_klass->is_interface()) { 1838 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1); 1839 Value receiver = state()->stack_at(index); 1840 CheckCast* c = new CheckCast(sender_klass, receiver, copy_state_before()); 1841 c->set_invokespecial_receiver_check(); 1842 state()->stack_at_put(index, append_split(c)); 1843 } 1844 } 1845 1846 // Some methods are obviously bindable without any type checks so 1847 // convert them directly to an invokespecial or invokestatic. 1848 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) { 1849 switch (bc_raw) { 1850 case Bytecodes::_invokevirtual: 1851 code = Bytecodes::_invokespecial; 1852 break; 1853 case Bytecodes::_invokehandle: 1854 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial; 1855 break; 1856 default: 1857 break; 1858 } 1859 } else { 1860 if (bc_raw == Bytecodes::_invokehandle) { 1861 assert(!will_link, "should come here only for unlinked call"); 1862 code = Bytecodes::_invokespecial; 1863 } 1864 } 1865 1866 // Push appendix argument (MethodType, CallSite, etc.), if one. 1867 bool patch_for_appendix = false; 1868 int patching_appendix_arg = 0; 1869 if (Bytecodes::has_optional_appendix(bc_raw) && (!will_link || PatchALot)) { 1870 Value arg = append(new Constant(new ObjectConstant(compilation()->env()->unloaded_ciinstance()), copy_state_before())); 1871 apush(arg); 1872 patch_for_appendix = true; 1873 patching_appendix_arg = (will_link && stream()->has_appendix()) ? 0 : 1; 1874 } else if (stream()->has_appendix()) { 1875 ciObject* appendix = stream()->get_appendix(); 1876 Value arg = append(new Constant(new ObjectConstant(appendix))); 1877 apush(arg); 1878 } 1879 1880 ciMethod* cha_monomorphic_target = NULL; 1881 ciMethod* exact_target = NULL; 1882 Value better_receiver = NULL; 1883 if (UseCHA && DeoptC1 && target->is_loaded() && 1884 !(// %%% FIXME: Are both of these relevant? 1885 target->is_method_handle_intrinsic() || 1886 target->is_compiled_lambda_form()) && 1887 !patch_for_appendix) { 1888 Value receiver = NULL; 1889 ciInstanceKlass* receiver_klass = NULL; 1890 bool type_is_exact = false; 1891 // try to find a precise receiver type 1892 if (will_link && !target->is_static()) { 1893 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1); 1894 receiver = state()->stack_at(index); 1895 ciType* type = receiver->exact_type(); 1896 if (type != NULL && type->is_loaded() && 1897 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) { 1898 receiver_klass = (ciInstanceKlass*) type; 1899 type_is_exact = true; 1900 } 1901 if (type == NULL) { 1902 type = receiver->declared_type(); 1903 if (type != NULL && type->is_loaded() && 1904 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) { 1905 receiver_klass = (ciInstanceKlass*) type; 1906 if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) { 1907 // Insert a dependency on this type since 1908 // find_monomorphic_target may assume it's already done. 1909 dependency_recorder()->assert_leaf_type(receiver_klass); 1910 type_is_exact = true; 1911 } 1912 } 1913 } 1914 } 1915 if (receiver_klass != NULL && type_is_exact && 1916 receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) { 1917 // If we have the exact receiver type we can bind directly to 1918 // the method to call. 1919 exact_target = target->resolve_invoke(calling_klass, receiver_klass); 1920 if (exact_target != NULL) { 1921 target = exact_target; 1922 code = Bytecodes::_invokespecial; 1923 } 1924 } 1925 if (receiver_klass != NULL && 1926 receiver_klass->is_subtype_of(actual_recv) && 1927 actual_recv->is_initialized()) { 1928 actual_recv = receiver_klass; 1929 } 1930 1931 if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) || 1932 (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) { 1933 // Use CHA on the receiver to select a more precise method. 1934 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); 1935 } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != NULL) { 1936 // if there is only one implementor of this interface then we 1937 // may be able bind this invoke directly to the implementing 1938 // klass but we need both a dependence on the single interface 1939 // and on the method we bind to. Additionally since all we know 1940 // about the receiver type is the it's supposed to implement the 1941 // interface we have to insert a check that it's the class we 1942 // expect. Interface types are not checked by the verifier so 1943 // they are roughly equivalent to Object. 1944 ciInstanceKlass* singleton = NULL; 1945 if (target->holder()->nof_implementors() == 1) { 1946 singleton = target->holder()->implementor(); 1947 assert(singleton != NULL && singleton != target->holder(), 1948 "just checking"); 1949 1950 assert(holder->is_interface(), "invokeinterface to non interface?"); 1951 ciInstanceKlass* decl_interface = (ciInstanceKlass*)holder; 1952 // the number of implementors for decl_interface is less or 1953 // equal to the number of implementors for target->holder() so 1954 // if number of implementors of target->holder() == 1 then 1955 // number of implementors for decl_interface is 0 or 1. If 1956 // it's 0 then no class implements decl_interface and there's 1957 // no point in inlining. 1958 if (!holder->is_loaded() || decl_interface->nof_implementors() != 1 || decl_interface->has_nonstatic_concrete_methods()) { 1959 singleton = NULL; 1960 } 1961 } 1962 if (singleton) { 1963 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, target->holder(), singleton); 1964 if (cha_monomorphic_target != NULL) { 1965 // If CHA is able to bind this invoke then update the class 1966 // to match that class, otherwise klass will refer to the 1967 // interface. 1968 klass = cha_monomorphic_target->holder(); 1969 actual_recv = target->holder(); 1970 1971 // insert a check it's really the expected class. 1972 CheckCast* c = new CheckCast(klass, receiver, copy_state_for_exception()); 1973 c->set_incompatible_class_change_check(); 1974 c->set_direct_compare(klass->is_final()); 1975 // pass the result of the checkcast so that the compiler has 1976 // more accurate type info in the inlinee 1977 better_receiver = append_split(c); 1978 } 1979 } 1980 } 1981 } 1982 1983 if (cha_monomorphic_target != NULL) { 1984 if (cha_monomorphic_target->is_abstract()) { 1985 // Do not optimize for abstract methods 1986 cha_monomorphic_target = NULL; 1987 } 1988 } 1989 1990 if (cha_monomorphic_target != NULL) { 1991 if (!(target->is_final_method())) { 1992 // If we inlined because CHA revealed only a single target method, 1993 // then we are dependent on that target method not getting overridden 1994 // by dynamic class loading. Be sure to test the "static" receiver 1995 // dest_method here, as opposed to the actual receiver, which may 1996 // falsely lead us to believe that the receiver is final or private. 1997 dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target); 1998 } 1999 code = Bytecodes::_invokespecial; 2000 } 2001 2002 // check if we could do inlining 2003 if (!PatchALot && Inline && target->is_loaded() && 2004 (klass->is_initialized() || (klass->is_interface() && target->holder()->is_initialized())) 2005 && !patch_for_appendix) { 2006 // callee is known => check if we have static binding 2007 if (code == Bytecodes::_invokestatic || 2008 code == Bytecodes::_invokespecial || 2009 (code == Bytecodes::_invokevirtual && target->is_final_method()) || 2010 code == Bytecodes::_invokedynamic) { 2011 ciMethod* inline_target = (cha_monomorphic_target != NULL) ? cha_monomorphic_target : target; 2012 // static binding => check if callee is ok 2013 bool success = try_inline(inline_target, (cha_monomorphic_target != NULL) || (exact_target != NULL), false, code, better_receiver); 2014 2015 CHECK_BAILOUT(); 2016 clear_inline_bailout(); 2017 2018 if (success) { 2019 // Register dependence if JVMTI has either breakpoint 2020 // setting or hotswapping of methods capabilities since they may 2021 // cause deoptimization. 2022 if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) { 2023 dependency_recorder()->assert_evol_method(inline_target); 2024 } 2025 return; 2026 } 2027 } else { 2028 print_inlining(target, "no static binding", /*success*/ false); 2029 } 2030 } else { 2031 print_inlining(target, "not inlineable", /*success*/ false); 2032 } 2033 2034 // If we attempted an inline which did not succeed because of a 2035 // bailout during construction of the callee graph, the entire 2036 // compilation has to be aborted. This is fairly rare and currently 2037 // seems to only occur for jasm-generated classes which contain 2038 // jsr/ret pairs which are not associated with finally clauses and 2039 // do not have exception handlers in the containing method, and are 2040 // therefore not caught early enough to abort the inlining without 2041 // corrupting the graph. (We currently bail out with a non-empty 2042 // stack at a ret in these situations.) 2043 CHECK_BAILOUT(); 2044 2045 // inlining not successful => standard invoke 2046 ValueType* result_type = as_ValueType(declared_signature->return_type()); 2047 ValueStack* state_before = copy_state_exhandling(); 2048 2049 // The bytecode (code) might change in this method so we are checking this very late. 2050 const bool has_receiver = 2051 code == Bytecodes::_invokespecial || 2052 code == Bytecodes::_invokevirtual || 2053 code == Bytecodes::_invokeinterface; 2054 Values* args = state()->pop_arguments(target->arg_size_no_receiver() + patching_appendix_arg); 2055 Value recv = has_receiver ? apop() : NULL; 2056 int vtable_index = Method::invalid_vtable_index; 2057 2058 #ifdef SPARC 2059 // Currently only supported on Sparc. 2060 // The UseInlineCaches only controls dispatch to invokevirtuals for 2061 // loaded classes which we weren't able to statically bind. 2062 if (!UseInlineCaches && target->is_loaded() && code == Bytecodes::_invokevirtual 2063 && !target->can_be_statically_bound()) { 2064 // Find a vtable index if one is available 2065 // For arrays, callee_holder is Object. Resolving the call with 2066 // Object would allow an illegal call to finalize() on an 2067 // array. We use holder instead: illegal calls to finalize() won't 2068 // be compiled as vtable calls (IC call resolution will catch the 2069 // illegal call) and the few legal calls on array types won't be 2070 // either. 2071 vtable_index = target->resolve_vtable_index(calling_klass, holder); 2072 } 2073 #endif 2074 2075 // A null check is required here (when there is a receiver) for any of the following cases 2076 // - invokespecial, always need a null check. 2077 // - invokevirtual, when the target is final and loaded. Calls to final targets will become optimized 2078 // and require null checking. If the target is loaded a null check is emitted here. 2079 // If the target isn't loaded the null check must happen after the call resolution. We achieve that 2080 // by using the target methods unverified entry point (see CompiledIC::compute_monomorphic_entry). 2081 // (The JVM specification requires that LinkageError must be thrown before a NPE. An unloaded target may 2082 // potentially fail, and can't have the null check before the resolution.) 2083 // - A call that will be profiled. (But we can't add a null check when the target is unloaded, by the same 2084 // reason as above, so calls with a receiver to unloaded targets can't be profiled.) 2085 // 2086 // Normal invokevirtual will perform the null check during lookup 2087 2088 bool need_null_check = (code == Bytecodes::_invokespecial) || 2089 (target->is_loaded() && (target->is_final_method() || (is_profiling() && profile_calls()))); 2090 2091 if (need_null_check) { 2092 if (recv != NULL) { 2093 null_check(recv); 2094 } 2095 2096 if (is_profiling()) { 2097 // Note that we'd collect profile data in this method if we wanted it. 2098 compilation()->set_would_profile(true); 2099 2100 if (profile_calls()) { 2101 assert(cha_monomorphic_target == NULL || exact_target == NULL, "both can not be set"); 2102 ciKlass* target_klass = NULL; 2103 if (cha_monomorphic_target != NULL) { 2104 target_klass = cha_monomorphic_target->holder(); 2105 } else if (exact_target != NULL) { 2106 target_klass = exact_target->holder(); 2107 } 2108 profile_call(target, recv, target_klass, collect_args_for_profiling(args, NULL, false), false); 2109 } 2110 } 2111 } 2112 2113 Invoke* result = new Invoke(code, result_type, recv, args, vtable_index, target, state_before); 2114 // push result 2115 append_split(result); 2116 2117 if (result_type != voidType) { 2118 if (method()->is_strict()) { 2119 push(result_type, round_fp(result)); 2120 } else { 2121 push(result_type, result); 2122 } 2123 } 2124 if (profile_return() && result_type->is_object_kind()) { 2125 profile_return_type(result, target); 2126 } 2127 } 2128 2129 2130 void GraphBuilder::new_instance(int klass_index) { 2131 ValueStack* state_before = copy_state_exhandling(); 2132 bool will_link; 2133 ciKlass* klass = stream()->get_klass(will_link); 2134 assert(klass->is_instance_klass(), "must be an instance klass"); 2135 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before, stream()->is_unresolved_klass()); 2136 _memory->new_instance(new_instance); 2137 apush(append_split(new_instance)); 2138 } 2139 2140 2141 void GraphBuilder::new_type_array() { 2142 ValueStack* state_before = copy_state_exhandling(); 2143 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before))); 2144 } 2145 2146 2147 void GraphBuilder::new_object_array() { 2148 bool will_link; 2149 ciKlass* klass = stream()->get_klass(will_link); 2150 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 2151 NewArray* n = new NewObjectArray(klass, ipop(), state_before); 2152 apush(append_split(n)); 2153 } 2154 2155 2156 bool GraphBuilder::direct_compare(ciKlass* k) { 2157 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) { 2158 ciInstanceKlass* ik = k->as_instance_klass(); 2159 if (ik->is_final()) { 2160 return true; 2161 } else { 2162 if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) { 2163 // test class is leaf class 2164 dependency_recorder()->assert_leaf_type(ik); 2165 return true; 2166 } 2167 } 2168 } 2169 return false; 2170 } 2171 2172 2173 void GraphBuilder::check_cast(int klass_index) { 2174 bool will_link; 2175 ciKlass* klass = stream()->get_klass(will_link); 2176 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception(); 2177 CheckCast* c = new CheckCast(klass, apop(), state_before); 2178 apush(append_split(c)); 2179 c->set_direct_compare(direct_compare(klass)); 2180 2181 if (is_profiling()) { 2182 // Note that we'd collect profile data in this method if we wanted it. 2183 compilation()->set_would_profile(true); 2184 2185 if (profile_checkcasts()) { 2186 c->set_profiled_method(method()); 2187 c->set_profiled_bci(bci()); 2188 c->set_should_profile(true); 2189 } 2190 } 2191 } 2192 2193 2194 void GraphBuilder::instance_of(int klass_index) { 2195 bool will_link; 2196 ciKlass* klass = stream()->get_klass(will_link); 2197 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 2198 InstanceOf* i = new InstanceOf(klass, apop(), state_before); 2199 ipush(append_split(i)); 2200 i->set_direct_compare(direct_compare(klass)); 2201 2202 if (is_profiling()) { 2203 // Note that we'd collect profile data in this method if we wanted it. 2204 compilation()->set_would_profile(true); 2205 2206 if (profile_checkcasts()) { 2207 i->set_profiled_method(method()); 2208 i->set_profiled_bci(bci()); 2209 i->set_should_profile(true); 2210 } 2211 } 2212 } 2213 2214 2215 void GraphBuilder::monitorenter(Value x, int bci) { 2216 // save state before locking in case of deoptimization after a NullPointerException 2217 ValueStack* state_before = copy_state_for_exception_with_bci(bci); 2218 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before), bci); 2219 kill_all(); 2220 } 2221 2222 2223 void GraphBuilder::monitorexit(Value x, int bci) { 2224 append_with_bci(new MonitorExit(x, state()->unlock()), bci); 2225 kill_all(); 2226 } 2227 2228 2229 void GraphBuilder::new_multi_array(int dimensions) { 2230 bool will_link; 2231 ciKlass* klass = stream()->get_klass(will_link); 2232 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 2233 2234 Values* dims = new Values(dimensions, dimensions, NULL); 2235 // fill in all dimensions 2236 int i = dimensions; 2237 while (i-- > 0) dims->at_put(i, ipop()); 2238 // create array 2239 NewArray* n = new NewMultiArray(klass, dims, state_before); 2240 apush(append_split(n)); 2241 } 2242 2243 2244 void GraphBuilder::throw_op(int bci) { 2245 // We require that the debug info for a Throw be the "state before" 2246 // the Throw (i.e., exception oop is still on TOS) 2247 ValueStack* state_before = copy_state_before_with_bci(bci); 2248 Throw* t = new Throw(apop(), state_before); 2249 // operand stack not needed after a throw 2250 state()->truncate_stack(0); 2251 append_with_bci(t, bci); 2252 } 2253 2254 2255 Value GraphBuilder::round_fp(Value fp_value) { 2256 // no rounding needed if SSE2 is used 2257 if (RoundFPResults && UseSSE < 2) { 2258 // Must currently insert rounding node for doubleword values that 2259 // are results of expressions (i.e., not loads from memory or 2260 // constants) 2261 if (fp_value->type()->tag() == doubleTag && 2262 fp_value->as_Constant() == NULL && 2263 fp_value->as_Local() == NULL && // method parameters need no rounding 2264 fp_value->as_RoundFP() == NULL) { 2265 return append(new RoundFP(fp_value)); 2266 } 2267 } 2268 return fp_value; 2269 } 2270 2271 2272 Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) { 2273 Canonicalizer canon(compilation(), instr, bci); 2274 Instruction* i1 = canon.canonical(); 2275 if (i1->is_linked() || !i1->can_be_linked()) { 2276 // Canonicalizer returned an instruction which was already 2277 // appended so simply return it. 2278 return i1; 2279 } 2280 2281 if (UseLocalValueNumbering) { 2282 // Lookup the instruction in the ValueMap and add it to the map if 2283 // it's not found. 2284 Instruction* i2 = vmap()->find_insert(i1); 2285 if (i2 != i1) { 2286 // found an entry in the value map, so just return it. 2287 assert(i2->is_linked(), "should already be linked"); 2288 return i2; 2289 } 2290 ValueNumberingEffects vne(vmap()); 2291 i1->visit(&vne); 2292 } 2293 2294 // i1 was not eliminated => append it 2295 assert(i1->next() == NULL, "shouldn't already be linked"); 2296 _last = _last->set_next(i1, canon.bci()); 2297 2298 if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) { 2299 // set the bailout state but complete normal processing. We 2300 // might do a little more work before noticing the bailout so we 2301 // want processing to continue normally until it's noticed. 2302 bailout("Method and/or inlining is too large"); 2303 } 2304 2305 #ifndef PRODUCT 2306 if (PrintIRDuringConstruction) { 2307 InstructionPrinter ip; 2308 ip.print_line(i1); 2309 if (Verbose) { 2310 state()->print(); 2311 } 2312 } 2313 #endif 2314 2315 // save state after modification of operand stack for StateSplit instructions 2316 StateSplit* s = i1->as_StateSplit(); 2317 if (s != NULL) { 2318 if (EliminateFieldAccess) { 2319 Intrinsic* intrinsic = s->as_Intrinsic(); 2320 if (s->as_Invoke() != NULL || (intrinsic && !intrinsic->preserves_state())) { 2321 _memory->kill(); 2322 } 2323 } 2324 s->set_state(state()->copy(ValueStack::StateAfter, canon.bci())); 2325 } 2326 2327 // set up exception handlers for this instruction if necessary 2328 if (i1->can_trap()) { 2329 i1->set_exception_handlers(handle_exception(i1)); 2330 assert(i1->exception_state() != NULL || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state"); 2331 } 2332 return i1; 2333 } 2334 2335 2336 Instruction* GraphBuilder::append(Instruction* instr) { 2337 assert(instr->as_StateSplit() == NULL || instr->as_BlockEnd() != NULL, "wrong append used"); 2338 return append_with_bci(instr, bci()); 2339 } 2340 2341 2342 Instruction* GraphBuilder::append_split(StateSplit* instr) { 2343 return append_with_bci(instr, bci()); 2344 } 2345 2346 2347 void GraphBuilder::null_check(Value value) { 2348 if (value->as_NewArray() != NULL || value->as_NewInstance() != NULL) { 2349 return; 2350 } else { 2351 Constant* con = value->as_Constant(); 2352 if (con) { 2353 ObjectType* c = con->type()->as_ObjectType(); 2354 if (c && c->is_loaded()) { 2355 ObjectConstant* oc = c->as_ObjectConstant(); 2356 if (!oc || !oc->value()->is_null_object()) { 2357 return; 2358 } 2359 } 2360 } 2361 } 2362 append(new NullCheck(value, copy_state_for_exception())); 2363 } 2364 2365 2366 2367 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) { 2368 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != NULL)) { 2369 assert(instruction->exception_state() == NULL 2370 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState 2371 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->should_retain_local_variables()), 2372 "exception_state should be of exception kind"); 2373 return new XHandlers(); 2374 } 2375 2376 XHandlers* exception_handlers = new XHandlers(); 2377 ScopeData* cur_scope_data = scope_data(); 2378 ValueStack* cur_state = instruction->state_before(); 2379 ValueStack* prev_state = NULL; 2380 int scope_count = 0; 2381 2382 assert(cur_state != NULL, "state_before must be set"); 2383 do { 2384 int cur_bci = cur_state->bci(); 2385 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match"); 2386 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci(), "invalid bci"); 2387 2388 // join with all potential exception handlers 2389 XHandlers* list = cur_scope_data->xhandlers(); 2390 const int n = list->length(); 2391 for (int i = 0; i < n; i++) { 2392 XHandler* h = list->handler_at(i); 2393 if (h->covers(cur_bci)) { 2394 // h is a potential exception handler => join it 2395 compilation()->set_has_exception_handlers(true); 2396 2397 BlockBegin* entry = h->entry_block(); 2398 if (entry == block()) { 2399 // It's acceptable for an exception handler to cover itself 2400 // but we don't handle that in the parser currently. It's 2401 // very rare so we bailout instead of trying to handle it. 2402 BAILOUT_("exception handler covers itself", exception_handlers); 2403 } 2404 assert(entry->bci() == h->handler_bci(), "must match"); 2405 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond"); 2406 2407 // previously this was a BAILOUT, but this is not necessary 2408 // now because asynchronous exceptions are not handled this way. 2409 assert(entry->state() == NULL || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match"); 2410 2411 // xhandler start with an empty expression stack 2412 if (cur_state->stack_size() != 0) { 2413 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci()); 2414 } 2415 if (instruction->exception_state() == NULL) { 2416 instruction->set_exception_state(cur_state); 2417 } 2418 2419 // Note: Usually this join must work. However, very 2420 // complicated jsr-ret structures where we don't ret from 2421 // the subroutine can cause the objects on the monitor 2422 // stacks to not match because blocks can be parsed twice. 2423 // The only test case we've seen so far which exhibits this 2424 // problem is caught by the infinite recursion test in 2425 // GraphBuilder::jsr() if the join doesn't work. 2426 if (!entry->try_merge(cur_state)) { 2427 BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers); 2428 } 2429 2430 // add current state for correct handling of phi functions at begin of xhandler 2431 int phi_operand = entry->add_exception_state(cur_state); 2432 2433 // add entry to the list of xhandlers of this block 2434 _block->add_exception_handler(entry); 2435 2436 // add back-edge from xhandler entry to this block 2437 if (!entry->is_predecessor(_block)) { 2438 entry->add_predecessor(_block); 2439 } 2440 2441 // clone XHandler because phi_operand and scope_count can not be shared 2442 XHandler* new_xhandler = new XHandler(h); 2443 new_xhandler->set_phi_operand(phi_operand); 2444 new_xhandler->set_scope_count(scope_count); 2445 exception_handlers->append(new_xhandler); 2446 2447 // fill in exception handler subgraph lazily 2448 assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet"); 2449 cur_scope_data->add_to_work_list(entry); 2450 2451 // stop when reaching catchall 2452 if (h->catch_type() == 0) { 2453 return exception_handlers; 2454 } 2455 } 2456 } 2457 2458 if (exception_handlers->length() == 0) { 2459 // This scope and all callees do not handle exceptions, so the local 2460 // variables of this scope are not needed. However, the scope itself is 2461 // required for a correct exception stack trace -> clear out the locals. 2462 if (_compilation->env()->should_retain_local_variables()) { 2463 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci()); 2464 } else { 2465 cur_state = cur_state->copy(ValueStack::EmptyExceptionState, cur_state->bci()); 2466 } 2467 if (prev_state != NULL) { 2468 prev_state->set_caller_state(cur_state); 2469 } 2470 if (instruction->exception_state() == NULL) { 2471 instruction->set_exception_state(cur_state); 2472 } 2473 } 2474 2475 // Set up iteration for next time. 2476 // If parsing a jsr, do not grab exception handlers from the 2477 // parent scopes for this method (already got them, and they 2478 // needed to be cloned) 2479 2480 while (cur_scope_data->parsing_jsr()) { 2481 cur_scope_data = cur_scope_data->parent(); 2482 } 2483 2484 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match"); 2485 assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler"); 2486 2487 prev_state = cur_state; 2488 cur_state = cur_state->caller_state(); 2489 cur_scope_data = cur_scope_data->parent(); 2490 scope_count++; 2491 } while (cur_scope_data != NULL); 2492 2493 return exception_handlers; 2494 } 2495 2496 2497 // Helper class for simplifying Phis. 2498 class PhiSimplifier : public BlockClosure { 2499 private: 2500 bool _has_substitutions; 2501 Value simplify(Value v); 2502 2503 public: 2504 PhiSimplifier(BlockBegin* start) : _has_substitutions(false) { 2505 start->iterate_preorder(this); 2506 if (_has_substitutions) { 2507 SubstitutionResolver sr(start); 2508 } 2509 } 2510 void block_do(BlockBegin* b); 2511 bool has_substitutions() const { return _has_substitutions; } 2512 }; 2513 2514 2515 Value PhiSimplifier::simplify(Value v) { 2516 Phi* phi = v->as_Phi(); 2517 2518 if (phi == NULL) { 2519 // no phi function 2520 return v; 2521 } else if (v->has_subst()) { 2522 // already substituted; subst can be phi itself -> simplify 2523 return simplify(v->subst()); 2524 } else if (phi->is_set(Phi::cannot_simplify)) { 2525 // already tried to simplify phi before 2526 return phi; 2527 } else if (phi->is_set(Phi::visited)) { 2528 // break cycles in phi functions 2529 return phi; 2530 } else if (phi->type()->is_illegal()) { 2531 // illegal phi functions are ignored anyway 2532 return phi; 2533 2534 } else { 2535 // mark phi function as processed to break cycles in phi functions 2536 phi->set(Phi::visited); 2537 2538 // simplify x = [y, x] and x = [y, y] to y 2539 Value subst = NULL; 2540 int opd_count = phi->operand_count(); 2541 for (int i = 0; i < opd_count; i++) { 2542 Value opd = phi->operand_at(i); 2543 assert(opd != NULL, "Operand must exist!"); 2544 2545 if (opd->type()->is_illegal()) { 2546 // if one operand is illegal, the entire phi function is illegal 2547 phi->make_illegal(); 2548 phi->clear(Phi::visited); 2549 return phi; 2550 } 2551 2552 Value new_opd = simplify(opd); 2553 assert(new_opd != NULL, "Simplified operand must exist!"); 2554 2555 if (new_opd != phi && new_opd != subst) { 2556 if (subst == NULL) { 2557 subst = new_opd; 2558 } else { 2559 // no simplification possible 2560 phi->set(Phi::cannot_simplify); 2561 phi->clear(Phi::visited); 2562 return phi; 2563 } 2564 } 2565 } 2566 2567 // sucessfully simplified phi function 2568 assert(subst != NULL, "illegal phi function"); 2569 _has_substitutions = true; 2570 phi->clear(Phi::visited); 2571 phi->set_subst(subst); 2572 2573 #ifndef PRODUCT 2574 if (PrintPhiFunctions) { 2575 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()); 2576 } 2577 #endif 2578 2579 return subst; 2580 } 2581 } 2582 2583 2584 void PhiSimplifier::block_do(BlockBegin* b) { 2585 for_each_phi_fun(b, phi, 2586 simplify(phi); 2587 ); 2588 2589 #ifdef ASSERT 2590 for_each_phi_fun(b, phi, 2591 assert(phi->operand_count() != 1 || phi->subst() != phi, "missed trivial simplification"); 2592 ); 2593 2594 ValueStack* state = b->state()->caller_state(); 2595 for_each_state_value(state, value, 2596 Phi* phi = value->as_Phi(); 2597 assert(phi == NULL || phi->block() != b, "must not have phi function to simplify in caller state"); 2598 ); 2599 #endif 2600 } 2601 2602 // This method is called after all blocks are filled with HIR instructions 2603 // It eliminates all Phi functions of the form x = [y, y] and x = [y, x] 2604 void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) { 2605 PhiSimplifier simplifier(start); 2606 } 2607 2608 2609 void GraphBuilder::connect_to_end(BlockBegin* beg) { 2610 // setup iteration 2611 kill_all(); 2612 _block = beg; 2613 _state = beg->state()->copy_for_parsing(); 2614 _last = beg; 2615 iterate_bytecodes_for_block(beg->bci()); 2616 } 2617 2618 2619 BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) { 2620 #ifndef PRODUCT 2621 if (PrintIRDuringConstruction) { 2622 tty->cr(); 2623 InstructionPrinter ip; 2624 ip.print_instr(_block); tty->cr(); 2625 ip.print_stack(_block->state()); tty->cr(); 2626 ip.print_inline_level(_block); 2627 ip.print_head(); 2628 tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size()); 2629 } 2630 #endif 2631 _skip_block = false; 2632 assert(state() != NULL, "ValueStack missing!"); 2633 CompileLog* log = compilation()->log(); 2634 ciBytecodeStream s(method()); 2635 s.reset_to_bci(bci); 2636 int prev_bci = bci; 2637 scope_data()->set_stream(&s); 2638 // iterate 2639 Bytecodes::Code code = Bytecodes::_illegal; 2640 bool push_exception = false; 2641 2642 if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == NULL) { 2643 // first thing in the exception entry block should be the exception object. 2644 push_exception = true; 2645 } 2646 2647 bool ignore_return = scope_data()->ignore_return(); 2648 2649 while (!bailed_out() && last()->as_BlockEnd() == NULL && 2650 (code = stream()->next()) != ciBytecodeStream::EOBC() && 2651 (block_at(s.cur_bci()) == NULL || block_at(s.cur_bci()) == block())) { 2652 assert(state()->kind() == ValueStack::Parsing, "invalid state kind"); 2653 2654 if (log != NULL) 2655 log->set_context("bc code='%d' bci='%d'", (int)code, s.cur_bci()); 2656 2657 // Check for active jsr during OSR compilation 2658 if (compilation()->is_osr_compile() 2659 && scope()->is_top_scope() 2660 && parsing_jsr() 2661 && s.cur_bci() == compilation()->osr_bci()) { 2662 bailout("OSR not supported while a jsr is active"); 2663 } 2664 2665 if (push_exception) { 2666 apush(append(new ExceptionObject())); 2667 push_exception = false; 2668 } 2669 2670 // handle bytecode 2671 switch (code) { 2672 case Bytecodes::_nop : /* nothing to do */ break; 2673 case Bytecodes::_aconst_null : apush(append(new Constant(objectNull ))); break; 2674 case Bytecodes::_iconst_m1 : ipush(append(new Constant(new IntConstant (-1)))); break; 2675 case Bytecodes::_iconst_0 : ipush(append(new Constant(intZero ))); break; 2676 case Bytecodes::_iconst_1 : ipush(append(new Constant(intOne ))); break; 2677 case Bytecodes::_iconst_2 : ipush(append(new Constant(new IntConstant ( 2)))); break; 2678 case Bytecodes::_iconst_3 : ipush(append(new Constant(new IntConstant ( 3)))); break; 2679 case Bytecodes::_iconst_4 : ipush(append(new Constant(new IntConstant ( 4)))); break; 2680 case Bytecodes::_iconst_5 : ipush(append(new Constant(new IntConstant ( 5)))); break; 2681 case Bytecodes::_lconst_0 : lpush(append(new Constant(new LongConstant ( 0)))); break; 2682 case Bytecodes::_lconst_1 : lpush(append(new Constant(new LongConstant ( 1)))); break; 2683 case Bytecodes::_fconst_0 : fpush(append(new Constant(new FloatConstant ( 0)))); break; 2684 case Bytecodes::_fconst_1 : fpush(append(new Constant(new FloatConstant ( 1)))); break; 2685 case Bytecodes::_fconst_2 : fpush(append(new Constant(new FloatConstant ( 2)))); break; 2686 case Bytecodes::_dconst_0 : dpush(append(new Constant(new DoubleConstant( 0)))); break; 2687 case Bytecodes::_dconst_1 : dpush(append(new Constant(new DoubleConstant( 1)))); break; 2688 case Bytecodes::_bipush : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break; 2689 case Bytecodes::_sipush : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break; 2690 case Bytecodes::_ldc : // fall through 2691 case Bytecodes::_ldc_w : // fall through 2692 case Bytecodes::_ldc2_w : load_constant(); break; 2693 case Bytecodes::_iload : load_local(intType , s.get_index()); break; 2694 case Bytecodes::_lload : load_local(longType , s.get_index()); break; 2695 case Bytecodes::_fload : load_local(floatType , s.get_index()); break; 2696 case Bytecodes::_dload : load_local(doubleType , s.get_index()); break; 2697 case Bytecodes::_aload : load_local(instanceType, s.get_index()); break; 2698 case Bytecodes::_iload_0 : load_local(intType , 0); break; 2699 case Bytecodes::_iload_1 : load_local(intType , 1); break; 2700 case Bytecodes::_iload_2 : load_local(intType , 2); break; 2701 case Bytecodes::_iload_3 : load_local(intType , 3); break; 2702 case Bytecodes::_lload_0 : load_local(longType , 0); break; 2703 case Bytecodes::_lload_1 : load_local(longType , 1); break; 2704 case Bytecodes::_lload_2 : load_local(longType , 2); break; 2705 case Bytecodes::_lload_3 : load_local(longType , 3); break; 2706 case Bytecodes::_fload_0 : load_local(floatType , 0); break; 2707 case Bytecodes::_fload_1 : load_local(floatType , 1); break; 2708 case Bytecodes::_fload_2 : load_local(floatType , 2); break; 2709 case Bytecodes::_fload_3 : load_local(floatType , 3); break; 2710 case Bytecodes::_dload_0 : load_local(doubleType, 0); break; 2711 case Bytecodes::_dload_1 : load_local(doubleType, 1); break; 2712 case Bytecodes::_dload_2 : load_local(doubleType, 2); break; 2713 case Bytecodes::_dload_3 : load_local(doubleType, 3); break; 2714 case Bytecodes::_aload_0 : load_local(objectType, 0); break; 2715 case Bytecodes::_aload_1 : load_local(objectType, 1); break; 2716 case Bytecodes::_aload_2 : load_local(objectType, 2); break; 2717 case Bytecodes::_aload_3 : load_local(objectType, 3); break; 2718 case Bytecodes::_iaload : load_indexed(T_INT ); break; 2719 case Bytecodes::_laload : load_indexed(T_LONG ); break; 2720 case Bytecodes::_faload : load_indexed(T_FLOAT ); break; 2721 case Bytecodes::_daload : load_indexed(T_DOUBLE); break; 2722 case Bytecodes::_aaload : load_indexed(T_OBJECT); break; 2723 case Bytecodes::_baload : load_indexed(T_BYTE ); break; 2724 case Bytecodes::_caload : load_indexed(T_CHAR ); break; 2725 case Bytecodes::_saload : load_indexed(T_SHORT ); break; 2726 case Bytecodes::_istore : store_local(intType , s.get_index()); break; 2727 case Bytecodes::_lstore : store_local(longType , s.get_index()); break; 2728 case Bytecodes::_fstore : store_local(floatType , s.get_index()); break; 2729 case Bytecodes::_dstore : store_local(doubleType, s.get_index()); break; 2730 case Bytecodes::_astore : store_local(objectType, s.get_index()); break; 2731 case Bytecodes::_istore_0 : store_local(intType , 0); break; 2732 case Bytecodes::_istore_1 : store_local(intType , 1); break; 2733 case Bytecodes::_istore_2 : store_local(intType , 2); break; 2734 case Bytecodes::_istore_3 : store_local(intType , 3); break; 2735 case Bytecodes::_lstore_0 : store_local(longType , 0); break; 2736 case Bytecodes::_lstore_1 : store_local(longType , 1); break; 2737 case Bytecodes::_lstore_2 : store_local(longType , 2); break; 2738 case Bytecodes::_lstore_3 : store_local(longType , 3); break; 2739 case Bytecodes::_fstore_0 : store_local(floatType , 0); break; 2740 case Bytecodes::_fstore_1 : store_local(floatType , 1); break; 2741 case Bytecodes::_fstore_2 : store_local(floatType , 2); break; 2742 case Bytecodes::_fstore_3 : store_local(floatType , 3); break; 2743 case Bytecodes::_dstore_0 : store_local(doubleType, 0); break; 2744 case Bytecodes::_dstore_1 : store_local(doubleType, 1); break; 2745 case Bytecodes::_dstore_2 : store_local(doubleType, 2); break; 2746 case Bytecodes::_dstore_3 : store_local(doubleType, 3); break; 2747 case Bytecodes::_astore_0 : store_local(objectType, 0); break; 2748 case Bytecodes::_astore_1 : store_local(objectType, 1); break; 2749 case Bytecodes::_astore_2 : store_local(objectType, 2); break; 2750 case Bytecodes::_astore_3 : store_local(objectType, 3); break; 2751 case Bytecodes::_iastore : store_indexed(T_INT ); break; 2752 case Bytecodes::_lastore : store_indexed(T_LONG ); break; 2753 case Bytecodes::_fastore : store_indexed(T_FLOAT ); break; 2754 case Bytecodes::_dastore : store_indexed(T_DOUBLE); break; 2755 case Bytecodes::_aastore : store_indexed(T_OBJECT); break; 2756 case Bytecodes::_bastore : store_indexed(T_BYTE ); break; 2757 case Bytecodes::_castore : store_indexed(T_CHAR ); break; 2758 case Bytecodes::_sastore : store_indexed(T_SHORT ); break; 2759 case Bytecodes::_pop : // fall through 2760 case Bytecodes::_pop2 : // fall through 2761 case Bytecodes::_dup : // fall through 2762 case Bytecodes::_dup_x1 : // fall through 2763 case Bytecodes::_dup_x2 : // fall through 2764 case Bytecodes::_dup2 : // fall through 2765 case Bytecodes::_dup2_x1 : // fall through 2766 case Bytecodes::_dup2_x2 : // fall through 2767 case Bytecodes::_swap : stack_op(code); break; 2768 case Bytecodes::_iadd : arithmetic_op(intType , code); break; 2769 case Bytecodes::_ladd : arithmetic_op(longType , code); break; 2770 case Bytecodes::_fadd : arithmetic_op(floatType , code); break; 2771 case Bytecodes::_dadd : arithmetic_op(doubleType, code); break; 2772 case Bytecodes::_isub : arithmetic_op(intType , code); break; 2773 case Bytecodes::_lsub : arithmetic_op(longType , code); break; 2774 case Bytecodes::_fsub : arithmetic_op(floatType , code); break; 2775 case Bytecodes::_dsub : arithmetic_op(doubleType, code); break; 2776 case Bytecodes::_imul : arithmetic_op(intType , code); break; 2777 case Bytecodes::_lmul : arithmetic_op(longType , code); break; 2778 case Bytecodes::_fmul : arithmetic_op(floatType , code); break; 2779 case Bytecodes::_dmul : arithmetic_op(doubleType, code); break; 2780 case Bytecodes::_idiv : arithmetic_op(intType , code, copy_state_for_exception()); break; 2781 case Bytecodes::_ldiv : arithmetic_op(longType , code, copy_state_for_exception()); break; 2782 case Bytecodes::_fdiv : arithmetic_op(floatType , code); break; 2783 case Bytecodes::_ddiv : arithmetic_op(doubleType, code); break; 2784 case Bytecodes::_irem : arithmetic_op(intType , code, copy_state_for_exception()); break; 2785 case Bytecodes::_lrem : arithmetic_op(longType , code, copy_state_for_exception()); break; 2786 case Bytecodes::_frem : arithmetic_op(floatType , code); break; 2787 case Bytecodes::_drem : arithmetic_op(doubleType, code); break; 2788 case Bytecodes::_ineg : negate_op(intType ); break; 2789 case Bytecodes::_lneg : negate_op(longType ); break; 2790 case Bytecodes::_fneg : negate_op(floatType ); break; 2791 case Bytecodes::_dneg : negate_op(doubleType); break; 2792 case Bytecodes::_ishl : shift_op(intType , code); break; 2793 case Bytecodes::_lshl : shift_op(longType, code); break; 2794 case Bytecodes::_ishr : shift_op(intType , code); break; 2795 case Bytecodes::_lshr : shift_op(longType, code); break; 2796 case Bytecodes::_iushr : shift_op(intType , code); break; 2797 case Bytecodes::_lushr : shift_op(longType, code); break; 2798 case Bytecodes::_iand : logic_op(intType , code); break; 2799 case Bytecodes::_land : logic_op(longType, code); break; 2800 case Bytecodes::_ior : logic_op(intType , code); break; 2801 case Bytecodes::_lor : logic_op(longType, code); break; 2802 case Bytecodes::_ixor : logic_op(intType , code); break; 2803 case Bytecodes::_lxor : logic_op(longType, code); break; 2804 case Bytecodes::_iinc : increment(); break; 2805 case Bytecodes::_i2l : convert(code, T_INT , T_LONG ); break; 2806 case Bytecodes::_i2f : convert(code, T_INT , T_FLOAT ); break; 2807 case Bytecodes::_i2d : convert(code, T_INT , T_DOUBLE); break; 2808 case Bytecodes::_l2i : convert(code, T_LONG , T_INT ); break; 2809 case Bytecodes::_l2f : convert(code, T_LONG , T_FLOAT ); break; 2810 case Bytecodes::_l2d : convert(code, T_LONG , T_DOUBLE); break; 2811 case Bytecodes::_f2i : convert(code, T_FLOAT , T_INT ); break; 2812 case Bytecodes::_f2l : convert(code, T_FLOAT , T_LONG ); break; 2813 case Bytecodes::_f2d : convert(code, T_FLOAT , T_DOUBLE); break; 2814 case Bytecodes::_d2i : convert(code, T_DOUBLE, T_INT ); break; 2815 case Bytecodes::_d2l : convert(code, T_DOUBLE, T_LONG ); break; 2816 case Bytecodes::_d2f : convert(code, T_DOUBLE, T_FLOAT ); break; 2817 case Bytecodes::_i2b : convert(code, T_INT , T_BYTE ); break; 2818 case Bytecodes::_i2c : convert(code, T_INT , T_CHAR ); break; 2819 case Bytecodes::_i2s : convert(code, T_INT , T_SHORT ); break; 2820 case Bytecodes::_lcmp : compare_op(longType , code); break; 2821 case Bytecodes::_fcmpl : compare_op(floatType , code); break; 2822 case Bytecodes::_fcmpg : compare_op(floatType , code); break; 2823 case Bytecodes::_dcmpl : compare_op(doubleType, code); break; 2824 case Bytecodes::_dcmpg : compare_op(doubleType, code); break; 2825 case Bytecodes::_ifeq : if_zero(intType , If::eql); break; 2826 case Bytecodes::_ifne : if_zero(intType , If::neq); break; 2827 case Bytecodes::_iflt : if_zero(intType , If::lss); break; 2828 case Bytecodes::_ifge : if_zero(intType , If::geq); break; 2829 case Bytecodes::_ifgt : if_zero(intType , If::gtr); break; 2830 case Bytecodes::_ifle : if_zero(intType , If::leq); break; 2831 case Bytecodes::_if_icmpeq : if_same(intType , If::eql); break; 2832 case Bytecodes::_if_icmpne : if_same(intType , If::neq); break; 2833 case Bytecodes::_if_icmplt : if_same(intType , If::lss); break; 2834 case Bytecodes::_if_icmpge : if_same(intType , If::geq); break; 2835 case Bytecodes::_if_icmpgt : if_same(intType , If::gtr); break; 2836 case Bytecodes::_if_icmple : if_same(intType , If::leq); break; 2837 case Bytecodes::_if_acmpeq : if_same(objectType, If::eql); break; 2838 case Bytecodes::_if_acmpne : if_same(objectType, If::neq); break; 2839 case Bytecodes::_goto : _goto(s.cur_bci(), s.get_dest()); break; 2840 case Bytecodes::_jsr : jsr(s.get_dest()); break; 2841 case Bytecodes::_ret : ret(s.get_index()); break; 2842 case Bytecodes::_tableswitch : table_switch(); break; 2843 case Bytecodes::_lookupswitch : lookup_switch(); break; 2844 case Bytecodes::_ireturn : method_return(ipop(), ignore_return); break; 2845 case Bytecodes::_lreturn : method_return(lpop(), ignore_return); break; 2846 case Bytecodes::_freturn : method_return(fpop(), ignore_return); break; 2847 case Bytecodes::_dreturn : method_return(dpop(), ignore_return); break; 2848 case Bytecodes::_areturn : method_return(apop(), ignore_return); break; 2849 case Bytecodes::_return : method_return(NULL , ignore_return); break; 2850 case Bytecodes::_getstatic : // fall through 2851 case Bytecodes::_putstatic : // fall through 2852 case Bytecodes::_getfield : // fall through 2853 case Bytecodes::_putfield : access_field(code); break; 2854 case Bytecodes::_invokevirtual : // fall through 2855 case Bytecodes::_invokespecial : // fall through 2856 case Bytecodes::_invokestatic : // fall through 2857 case Bytecodes::_invokedynamic : // fall through 2858 case Bytecodes::_invokeinterface: invoke(code); break; 2859 case Bytecodes::_new : new_instance(s.get_index_u2()); break; 2860 case Bytecodes::_newarray : new_type_array(); break; 2861 case Bytecodes::_anewarray : new_object_array(); break; 2862 case Bytecodes::_arraylength : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; } 2863 case Bytecodes::_athrow : throw_op(s.cur_bci()); break; 2864 case Bytecodes::_checkcast : check_cast(s.get_index_u2()); break; 2865 case Bytecodes::_instanceof : instance_of(s.get_index_u2()); break; 2866 case Bytecodes::_monitorenter : monitorenter(apop(), s.cur_bci()); break; 2867 case Bytecodes::_monitorexit : monitorexit (apop(), s.cur_bci()); break; 2868 case Bytecodes::_wide : ShouldNotReachHere(); break; 2869 case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break; 2870 case Bytecodes::_ifnull : if_null(objectType, If::eql); break; 2871 case Bytecodes::_ifnonnull : if_null(objectType, If::neq); break; 2872 case Bytecodes::_goto_w : _goto(s.cur_bci(), s.get_far_dest()); break; 2873 case Bytecodes::_jsr_w : jsr(s.get_far_dest()); break; 2874 case Bytecodes::_breakpoint : BAILOUT_("concurrent setting of breakpoint", NULL); 2875 default : ShouldNotReachHere(); break; 2876 } 2877 2878 if (log != NULL) 2879 log->clear_context(); // skip marker if nothing was printed 2880 2881 // save current bci to setup Goto at the end 2882 prev_bci = s.cur_bci(); 2883 2884 } 2885 CHECK_BAILOUT_(NULL); 2886 // stop processing of this block (see try_inline_full) 2887 if (_skip_block) { 2888 _skip_block = false; 2889 assert(_last && _last->as_BlockEnd(), ""); 2890 return _last->as_BlockEnd(); 2891 } 2892 // if there are any, check if last instruction is a BlockEnd instruction 2893 BlockEnd* end = last()->as_BlockEnd(); 2894 if (end == NULL) { 2895 // all blocks must end with a BlockEnd instruction => add a Goto 2896 end = new Goto(block_at(s.cur_bci()), false); 2897 append(end); 2898 } 2899 assert(end == last()->as_BlockEnd(), "inconsistency"); 2900 2901 assert(end->state() != NULL, "state must already be present"); 2902 assert(end->as_Return() == NULL || end->as_Throw() == NULL || end->state()->stack_size() == 0, "stack not needed for return and throw"); 2903 2904 // connect to begin & set state 2905 // NOTE that inlining may have changed the block we are parsing 2906 block()->set_end(end); 2907 // propagate state 2908 for (int i = end->number_of_sux() - 1; i >= 0; i--) { 2909 BlockBegin* sux = end->sux_at(i); 2910 assert(sux->is_predecessor(block()), "predecessor missing"); 2911 // be careful, bailout if bytecodes are strange 2912 if (!sux->try_merge(end->state())) BAILOUT_("block join failed", NULL); 2913 scope_data()->add_to_work_list(end->sux_at(i)); 2914 } 2915 2916 scope_data()->set_stream(NULL); 2917 2918 // done 2919 return end; 2920 } 2921 2922 2923 void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) { 2924 do { 2925 if (start_in_current_block_for_inlining && !bailed_out()) { 2926 iterate_bytecodes_for_block(0); 2927 start_in_current_block_for_inlining = false; 2928 } else { 2929 BlockBegin* b; 2930 while ((b = scope_data()->remove_from_work_list()) != NULL) { 2931 if (!b->is_set(BlockBegin::was_visited_flag)) { 2932 if (b->is_set(BlockBegin::osr_entry_flag)) { 2933 // we're about to parse the osr entry block, so make sure 2934 // we setup the OSR edge leading into this block so that 2935 // Phis get setup correctly. 2936 setup_osr_entry_block(); 2937 // this is no longer the osr entry block, so clear it. 2938 b->clear(BlockBegin::osr_entry_flag); 2939 } 2940 b->set(BlockBegin::was_visited_flag); 2941 connect_to_end(b); 2942 } 2943 } 2944 } 2945 } while (!bailed_out() && !scope_data()->is_work_list_empty()); 2946 } 2947 2948 2949 bool GraphBuilder::_can_trap [Bytecodes::number_of_java_codes]; 2950 2951 void GraphBuilder::initialize() { 2952 // the following bytecodes are assumed to potentially 2953 // throw exceptions in compiled code - note that e.g. 2954 // monitorexit & the return bytecodes do not throw 2955 // exceptions since monitor pairing proved that they 2956 // succeed (if monitor pairing succeeded) 2957 Bytecodes::Code can_trap_list[] = 2958 { Bytecodes::_ldc 2959 , Bytecodes::_ldc_w 2960 , Bytecodes::_ldc2_w 2961 , Bytecodes::_iaload 2962 , Bytecodes::_laload 2963 , Bytecodes::_faload 2964 , Bytecodes::_daload 2965 , Bytecodes::_aaload 2966 , Bytecodes::_baload 2967 , Bytecodes::_caload 2968 , Bytecodes::_saload 2969 , Bytecodes::_iastore 2970 , Bytecodes::_lastore 2971 , Bytecodes::_fastore 2972 , Bytecodes::_dastore 2973 , Bytecodes::_aastore 2974 , Bytecodes::_bastore 2975 , Bytecodes::_castore 2976 , Bytecodes::_sastore 2977 , Bytecodes::_idiv 2978 , Bytecodes::_ldiv 2979 , Bytecodes::_irem 2980 , Bytecodes::_lrem 2981 , Bytecodes::_getstatic 2982 , Bytecodes::_putstatic 2983 , Bytecodes::_getfield 2984 , Bytecodes::_putfield 2985 , Bytecodes::_invokevirtual 2986 , Bytecodes::_invokespecial 2987 , Bytecodes::_invokestatic 2988 , Bytecodes::_invokedynamic 2989 , Bytecodes::_invokeinterface 2990 , Bytecodes::_new 2991 , Bytecodes::_newarray 2992 , Bytecodes::_anewarray 2993 , Bytecodes::_arraylength 2994 , Bytecodes::_athrow 2995 , Bytecodes::_checkcast 2996 , Bytecodes::_instanceof 2997 , Bytecodes::_monitorenter 2998 , Bytecodes::_multianewarray 2999 }; 3000 3001 // inititialize trap tables 3002 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { 3003 _can_trap[i] = false; 3004 } 3005 // set standard trap info 3006 for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) { 3007 _can_trap[can_trap_list[j]] = true; 3008 } 3009 } 3010 3011 3012 BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) { 3013 assert(entry->is_set(f), "entry/flag mismatch"); 3014 // create header block 3015 BlockBegin* h = new BlockBegin(entry->bci()); 3016 h->set_depth_first_number(0); 3017 3018 Value l = h; 3019 BlockEnd* g = new Goto(entry, false); 3020 l->set_next(g, entry->bci()); 3021 h->set_end(g); 3022 h->set(f); 3023 // setup header block end state 3024 ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis) 3025 assert(s->stack_is_empty(), "must have empty stack at entry point"); 3026 g->set_state(s); 3027 return h; 3028 } 3029 3030 3031 3032 BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) { 3033 BlockBegin* start = new BlockBegin(0); 3034 3035 // This code eliminates the empty start block at the beginning of 3036 // each method. Previously, each method started with the 3037 // start-block created below, and this block was followed by the 3038 // header block that was always empty. This header block is only 3039 // necesary if std_entry is also a backward branch target because 3040 // then phi functions may be necessary in the header block. It's 3041 // also necessary when profiling so that there's a single block that 3042 // can increment the interpreter_invocation_count. 3043 BlockBegin* new_header_block; 3044 if (std_entry->number_of_preds() > 0 || count_invocations() || count_backedges()) { 3045 new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state); 3046 } else { 3047 new_header_block = std_entry; 3048 } 3049 3050 // setup start block (root for the IR graph) 3051 Base* base = 3052 new Base( 3053 new_header_block, 3054 osr_entry 3055 ); 3056 start->set_next(base, 0); 3057 start->set_end(base); 3058 // create & setup state for start block 3059 start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci())); 3060 base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci())); 3061 3062 if (base->std_entry()->state() == NULL) { 3063 // setup states for header blocks 3064 base->std_entry()->merge(state); 3065 } 3066 3067 assert(base->std_entry()->state() != NULL, ""); 3068 return start; 3069 } 3070 3071 3072 void GraphBuilder::setup_osr_entry_block() { 3073 assert(compilation()->is_osr_compile(), "only for osrs"); 3074 3075 int osr_bci = compilation()->osr_bci(); 3076 ciBytecodeStream s(method()); 3077 s.reset_to_bci(osr_bci); 3078 s.next(); 3079 scope_data()->set_stream(&s); 3080 3081 // create a new block to be the osr setup code 3082 _osr_entry = new BlockBegin(osr_bci); 3083 _osr_entry->set(BlockBegin::osr_entry_flag); 3084 _osr_entry->set_depth_first_number(0); 3085 BlockBegin* target = bci2block()->at(osr_bci); 3086 assert(target != NULL && target->is_set(BlockBegin::osr_entry_flag), "must be there"); 3087 // the osr entry has no values for locals 3088 ValueStack* state = target->state()->copy(); 3089 _osr_entry->set_state(state); 3090 3091 kill_all(); 3092 _block = _osr_entry; 3093 _state = _osr_entry->state()->copy(); 3094 assert(_state->bci() == osr_bci, "mismatch"); 3095 _last = _osr_entry; 3096 Value e = append(new OsrEntry()); 3097 e->set_needs_null_check(false); 3098 3099 // OSR buffer is 3100 // 3101 // locals[nlocals-1..0] 3102 // monitors[number_of_locks-1..0] 3103 // 3104 // locals is a direct copy of the interpreter frame so in the osr buffer 3105 // so first slot in the local array is the last local from the interpreter 3106 // and last slot is local[0] (receiver) from the interpreter 3107 // 3108 // Similarly with locks. The first lock slot in the osr buffer is the nth lock 3109 // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock 3110 // in the interpreter frame (the method lock if a sync method) 3111 3112 // Initialize monitors in the compiled activation. 3113 3114 int index; 3115 Value local; 3116 3117 // find all the locals that the interpreter thinks contain live oops 3118 const ResourceBitMap live_oops = method()->live_local_oops_at_bci(osr_bci); 3119 3120 // compute the offset into the locals so that we can treat the buffer 3121 // as if the locals were still in the interpreter frame 3122 int locals_offset = BytesPerWord * (method()->max_locals() - 1); 3123 for_each_local_value(state, index, local) { 3124 int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord; 3125 Value get; 3126 if (local->type()->is_object_kind() && !live_oops.at(index)) { 3127 // The interpreter thinks this local is dead but the compiler 3128 // doesn't so pretend that the interpreter passed in null. 3129 get = append(new Constant(objectNull)); 3130 } else { 3131 get = append(new UnsafeGetRaw(as_BasicType(local->type()), e, 3132 append(new Constant(new IntConstant(offset))), 3133 0, 3134 true /*unaligned*/, true /*wide*/)); 3135 } 3136 _state->store_local(index, get); 3137 } 3138 3139 // the storage for the OSR buffer is freed manually in the LIRGenerator. 3140 3141 assert(state->caller_state() == NULL, "should be top scope"); 3142 state->clear_locals(); 3143 Goto* g = new Goto(target, false); 3144 append(g); 3145 _osr_entry->set_end(g); 3146 target->merge(_osr_entry->end()->state()); 3147 3148 scope_data()->set_stream(NULL); 3149 } 3150 3151 3152 ValueStack* GraphBuilder::state_at_entry() { 3153 ValueStack* state = new ValueStack(scope(), NULL); 3154 3155 // Set up locals for receiver 3156 int idx = 0; 3157 if (!method()->is_static()) { 3158 // we should always see the receiver 3159 state->store_local(idx, new Local(method()->holder(), objectType, idx, true)); 3160 idx = 1; 3161 } 3162 3163 // Set up locals for incoming arguments 3164 ciSignature* sig = method()->signature(); 3165 for (int i = 0; i < sig->count(); i++) { 3166 ciType* type = sig->type_at(i); 3167 BasicType basic_type = type->basic_type(); 3168 // don't allow T_ARRAY to propagate into locals types 3169 if (basic_type == T_ARRAY) basic_type = T_OBJECT; 3170 ValueType* vt = as_ValueType(basic_type); 3171 state->store_local(idx, new Local(type, vt, idx, false)); 3172 idx += type->size(); 3173 } 3174 3175 // lock synchronized method 3176 if (method()->is_synchronized()) { 3177 state->lock(NULL); 3178 } 3179 3180 return state; 3181 } 3182 3183 3184 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope) 3185 : _scope_data(NULL) 3186 , _instruction_count(0) 3187 , _osr_entry(NULL) 3188 , _memory(new MemoryBuffer()) 3189 , _compilation(compilation) 3190 , _inline_bailout_msg(NULL) 3191 { 3192 int osr_bci = compilation->osr_bci(); 3193 3194 // determine entry points and bci2block mapping 3195 BlockListBuilder blm(compilation, scope, osr_bci); 3196 CHECK_BAILOUT(); 3197 3198 BlockList* bci2block = blm.bci2block(); 3199 BlockBegin* start_block = bci2block->at(0); 3200 3201 push_root_scope(scope, bci2block, start_block); 3202 3203 // setup state for std entry 3204 _initial_state = state_at_entry(); 3205 start_block->merge(_initial_state); 3206 3207 // complete graph 3208 _vmap = new ValueMap(); 3209 switch (scope->method()->intrinsic_id()) { 3210 case vmIntrinsics::_dabs : // fall through 3211 case vmIntrinsics::_dsqrt : // fall through 3212 case vmIntrinsics::_dsin : // fall through 3213 case vmIntrinsics::_dcos : // fall through 3214 case vmIntrinsics::_dtan : // fall through 3215 case vmIntrinsics::_dlog : // fall through 3216 case vmIntrinsics::_dlog10 : // fall through 3217 case vmIntrinsics::_dexp : // fall through 3218 case vmIntrinsics::_dpow : // fall through 3219 { 3220 // Compiles where the root method is an intrinsic need a special 3221 // compilation environment because the bytecodes for the method 3222 // shouldn't be parsed during the compilation, only the special 3223 // Intrinsic node should be emitted. If this isn't done the the 3224 // code for the inlined version will be different than the root 3225 // compiled version which could lead to monotonicity problems on 3226 // intel. 3227 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) { 3228 BAILOUT("failed to inline intrinsic, method not annotated"); 3229 } 3230 3231 // Set up a stream so that appending instructions works properly. 3232 ciBytecodeStream s(scope->method()); 3233 s.reset_to_bci(0); 3234 scope_data()->set_stream(&s); 3235 s.next(); 3236 3237 // setup the initial block state 3238 _block = start_block; 3239 _state = start_block->state()->copy_for_parsing(); 3240 _last = start_block; 3241 load_local(doubleType, 0); 3242 if (scope->method()->intrinsic_id() == vmIntrinsics::_dpow) { 3243 load_local(doubleType, 2); 3244 } 3245 3246 // Emit the intrinsic node. 3247 bool result = try_inline_intrinsics(scope->method()); 3248 if (!result) BAILOUT("failed to inline intrinsic"); 3249 method_return(dpop()); 3250 3251 // connect the begin and end blocks and we're all done. 3252 BlockEnd* end = last()->as_BlockEnd(); 3253 block()->set_end(end); 3254 break; 3255 } 3256 3257 case vmIntrinsics::_Reference_get: 3258 { 3259 { 3260 // With java.lang.ref.reference.get() we must go through the 3261 // intrinsic - when G1 is enabled - even when get() is the root 3262 // method of the compile so that, if necessary, the value in 3263 // the referent field of the reference object gets recorded by 3264 // the pre-barrier code. 3265 // Specifically, if G1 is enabled, the value in the referent 3266 // field is recorded by the G1 SATB pre barrier. This will 3267 // result in the referent being marked live and the reference 3268 // object removed from the list of discovered references during 3269 // reference processing. 3270 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) { 3271 BAILOUT("failed to inline intrinsic, method not annotated"); 3272 } 3273 3274 // Also we need intrinsic to prevent commoning reads from this field 3275 // across safepoint since GC can change its value. 3276 3277 // Set up a stream so that appending instructions works properly. 3278 ciBytecodeStream s(scope->method()); 3279 s.reset_to_bci(0); 3280 scope_data()->set_stream(&s); 3281 s.next(); 3282 3283 // setup the initial block state 3284 _block = start_block; 3285 _state = start_block->state()->copy_for_parsing(); 3286 _last = start_block; 3287 load_local(objectType, 0); 3288 3289 // Emit the intrinsic node. 3290 bool result = try_inline_intrinsics(scope->method()); 3291 if (!result) BAILOUT("failed to inline intrinsic"); 3292 method_return(apop()); 3293 3294 // connect the begin and end blocks and we're all done. 3295 BlockEnd* end = last()->as_BlockEnd(); 3296 block()->set_end(end); 3297 break; 3298 } 3299 // Otherwise, fall thru 3300 } 3301 3302 default: 3303 scope_data()->add_to_work_list(start_block); 3304 iterate_all_blocks(); 3305 break; 3306 } 3307 CHECK_BAILOUT(); 3308 3309 _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state); 3310 3311 eliminate_redundant_phis(_start); 3312 3313 NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats()); 3314 // for osr compile, bailout if some requirements are not fulfilled 3315 if (osr_bci != -1) { 3316 BlockBegin* osr_block = blm.bci2block()->at(osr_bci); 3317 if (!osr_block->is_set(BlockBegin::was_visited_flag)) { 3318 BAILOUT("osr entry must have been visited for osr compile"); 3319 } 3320 3321 // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points 3322 if (!osr_block->state()->stack_is_empty()) { 3323 BAILOUT("stack not empty at OSR entry point"); 3324 } 3325 } 3326 #ifndef PRODUCT 3327 if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count); 3328 #endif 3329 } 3330 3331 3332 ValueStack* GraphBuilder::copy_state_before() { 3333 return copy_state_before_with_bci(bci()); 3334 } 3335 3336 ValueStack* GraphBuilder::copy_state_exhandling() { 3337 return copy_state_exhandling_with_bci(bci()); 3338 } 3339 3340 ValueStack* GraphBuilder::copy_state_for_exception() { 3341 return copy_state_for_exception_with_bci(bci()); 3342 } 3343 3344 ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) { 3345 return state()->copy(ValueStack::StateBefore, bci); 3346 } 3347 3348 ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) { 3349 if (!has_handler()) return NULL; 3350 return state()->copy(ValueStack::StateBefore, bci); 3351 } 3352 3353 ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) { 3354 ValueStack* s = copy_state_exhandling_with_bci(bci); 3355 if (s == NULL) { 3356 if (_compilation->env()->should_retain_local_variables()) { 3357 s = state()->copy(ValueStack::ExceptionState, bci); 3358 } else { 3359 s = state()->copy(ValueStack::EmptyExceptionState, bci); 3360 } 3361 } 3362 return s; 3363 } 3364 3365 int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const { 3366 int recur_level = 0; 3367 for (IRScope* s = scope(); s != NULL; s = s->caller()) { 3368 if (s->method() == cur_callee) { 3369 ++recur_level; 3370 } 3371 } 3372 return recur_level; 3373 } 3374 3375 3376 bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) { 3377 const char* msg = NULL; 3378 3379 // clear out any existing inline bailout condition 3380 clear_inline_bailout(); 3381 3382 // exclude methods we don't want to inline 3383 msg = should_not_inline(callee); 3384 if (msg != NULL) { 3385 print_inlining(callee, msg, /*success*/ false); 3386 return false; 3387 } 3388 3389 // method handle invokes 3390 if (callee->is_method_handle_intrinsic()) { 3391 if (try_method_handle_inline(callee, ignore_return)) { 3392 if (callee->has_reserved_stack_access()) { 3393 compilation()->set_has_reserved_stack_access(true); 3394 } 3395 return true; 3396 } 3397 return false; 3398 } 3399 3400 // handle intrinsics 3401 if (callee->intrinsic_id() != vmIntrinsics::_none && 3402 (CheckIntrinsics ? callee->intrinsic_candidate() : true)) { 3403 if (try_inline_intrinsics(callee, ignore_return)) { 3404 print_inlining(callee, "intrinsic"); 3405 if (callee->has_reserved_stack_access()) { 3406 compilation()->set_has_reserved_stack_access(true); 3407 } 3408 return true; 3409 } 3410 // try normal inlining 3411 } 3412 3413 // certain methods cannot be parsed at all 3414 msg = check_can_parse(callee); 3415 if (msg != NULL) { 3416 print_inlining(callee, msg, /*success*/ false); 3417 return false; 3418 } 3419 3420 // If bytecode not set use the current one. 3421 if (bc == Bytecodes::_illegal) { 3422 bc = code(); 3423 } 3424 if (try_inline_full(callee, holder_known, ignore_return, bc, receiver)) { 3425 if (callee->has_reserved_stack_access()) { 3426 compilation()->set_has_reserved_stack_access(true); 3427 } 3428 return true; 3429 } 3430 3431 // Entire compilation could fail during try_inline_full call. 3432 // In that case printing inlining decision info is useless. 3433 if (!bailed_out()) 3434 print_inlining(callee, _inline_bailout_msg, /*success*/ false); 3435 3436 return false; 3437 } 3438 3439 3440 const char* GraphBuilder::check_can_parse(ciMethod* callee) const { 3441 // Certain methods cannot be parsed at all: 3442 if ( callee->is_native()) return "native method"; 3443 if ( callee->is_abstract()) return "abstract method"; 3444 if (!callee->can_be_compiled()) return "not compilable (disabled)"; 3445 if (!callee->can_be_parsed()) return "cannot be parsed"; 3446 return NULL; 3447 } 3448 3449 // negative filter: should callee NOT be inlined? returns NULL, ok to inline, or rejection msg 3450 const char* GraphBuilder::should_not_inline(ciMethod* callee) const { 3451 if ( compilation()->directive()->should_not_inline(callee)) return "disallowed by CompileCommand"; 3452 if ( callee->dont_inline()) return "don't inline by annotation"; 3453 return NULL; 3454 } 3455 3456 void GraphBuilder::build_graph_for_intrinsic(ciMethod* callee, bool ignore_return) { 3457 vmIntrinsics::ID id = callee->intrinsic_id(); 3458 assert(id != vmIntrinsics::_none, "must be a VM intrinsic"); 3459 3460 // Some intrinsics need special IR nodes. 3461 switch(id) { 3462 case vmIntrinsics::_getObject : append_unsafe_get_obj(callee, T_OBJECT, false); return; 3463 case vmIntrinsics::_getBoolean : append_unsafe_get_obj(callee, T_BOOLEAN, false); return; 3464 case vmIntrinsics::_getByte : append_unsafe_get_obj(callee, T_BYTE, false); return; 3465 case vmIntrinsics::_getShort : append_unsafe_get_obj(callee, T_SHORT, false); return; 3466 case vmIntrinsics::_getChar : append_unsafe_get_obj(callee, T_CHAR, false); return; 3467 case vmIntrinsics::_getInt : append_unsafe_get_obj(callee, T_INT, false); return; 3468 case vmIntrinsics::_getLong : append_unsafe_get_obj(callee, T_LONG, false); return; 3469 case vmIntrinsics::_getFloat : append_unsafe_get_obj(callee, T_FLOAT, false); return; 3470 case vmIntrinsics::_getDouble : append_unsafe_get_obj(callee, T_DOUBLE, false); return; 3471 case vmIntrinsics::_putObject : append_unsafe_put_obj(callee, T_OBJECT, false); return; 3472 case vmIntrinsics::_putBoolean : append_unsafe_put_obj(callee, T_BOOLEAN, false); return; 3473 case vmIntrinsics::_putByte : append_unsafe_put_obj(callee, T_BYTE, false); return; 3474 case vmIntrinsics::_putShort : append_unsafe_put_obj(callee, T_SHORT, false); return; 3475 case vmIntrinsics::_putChar : append_unsafe_put_obj(callee, T_CHAR, false); return; 3476 case vmIntrinsics::_putInt : append_unsafe_put_obj(callee, T_INT, false); return; 3477 case vmIntrinsics::_putLong : append_unsafe_put_obj(callee, T_LONG, false); return; 3478 case vmIntrinsics::_putFloat : append_unsafe_put_obj(callee, T_FLOAT, false); return; 3479 case vmIntrinsics::_putDouble : append_unsafe_put_obj(callee, T_DOUBLE, false); return; 3480 case vmIntrinsics::_getShortUnaligned : append_unsafe_get_obj(callee, T_SHORT, false); return; 3481 case vmIntrinsics::_getCharUnaligned : append_unsafe_get_obj(callee, T_CHAR, false); return; 3482 case vmIntrinsics::_getIntUnaligned : append_unsafe_get_obj(callee, T_INT, false); return; 3483 case vmIntrinsics::_getLongUnaligned : append_unsafe_get_obj(callee, T_LONG, false); return; 3484 case vmIntrinsics::_putShortUnaligned : append_unsafe_put_obj(callee, T_SHORT, false); return; 3485 case vmIntrinsics::_putCharUnaligned : append_unsafe_put_obj(callee, T_CHAR, false); return; 3486 case vmIntrinsics::_putIntUnaligned : append_unsafe_put_obj(callee, T_INT, false); return; 3487 case vmIntrinsics::_putLongUnaligned : append_unsafe_put_obj(callee, T_LONG, false); return; 3488 case vmIntrinsics::_getObjectVolatile : append_unsafe_get_obj(callee, T_OBJECT, true); return; 3489 case vmIntrinsics::_getBooleanVolatile : append_unsafe_get_obj(callee, T_BOOLEAN, true); return; 3490 case vmIntrinsics::_getByteVolatile : append_unsafe_get_obj(callee, T_BYTE, true); return; 3491 case vmIntrinsics::_getShortVolatile : append_unsafe_get_obj(callee, T_SHORT, true); return; 3492 case vmIntrinsics::_getCharVolatile : append_unsafe_get_obj(callee, T_CHAR, true); return; 3493 case vmIntrinsics::_getIntVolatile : append_unsafe_get_obj(callee, T_INT, true); return; 3494 case vmIntrinsics::_getLongVolatile : append_unsafe_get_obj(callee, T_LONG, true); return; 3495 case vmIntrinsics::_getFloatVolatile : append_unsafe_get_obj(callee, T_FLOAT, true); return; 3496 case vmIntrinsics::_getDoubleVolatile : append_unsafe_get_obj(callee, T_DOUBLE, true); return; 3497 case vmIntrinsics::_putObjectVolatile : append_unsafe_put_obj(callee, T_OBJECT, true); return; 3498 case vmIntrinsics::_putBooleanVolatile : append_unsafe_put_obj(callee, T_BOOLEAN, true); return; 3499 case vmIntrinsics::_putByteVolatile : append_unsafe_put_obj(callee, T_BYTE, true); return; 3500 case vmIntrinsics::_putShortVolatile : append_unsafe_put_obj(callee, T_SHORT, true); return; 3501 case vmIntrinsics::_putCharVolatile : append_unsafe_put_obj(callee, T_CHAR, true); return; 3502 case vmIntrinsics::_putIntVolatile : append_unsafe_put_obj(callee, T_INT, true); return; 3503 case vmIntrinsics::_putLongVolatile : append_unsafe_put_obj(callee, T_LONG, true); return; 3504 case vmIntrinsics::_putFloatVolatile : append_unsafe_put_obj(callee, T_FLOAT, true); return; 3505 case vmIntrinsics::_putDoubleVolatile : append_unsafe_put_obj(callee, T_DOUBLE, true); return; 3506 case vmIntrinsics::_compareAndSetLong: 3507 case vmIntrinsics::_compareAndSetInt: 3508 case vmIntrinsics::_compareAndSetObject: append_unsafe_CAS(callee); return; 3509 case vmIntrinsics::_getAndAddInt: 3510 case vmIntrinsics::_getAndAddLong : append_unsafe_get_and_set_obj(callee, true); return; 3511 case vmIntrinsics::_getAndSetInt : 3512 case vmIntrinsics::_getAndSetLong : 3513 case vmIntrinsics::_getAndSetObject : append_unsafe_get_and_set_obj(callee, false); return; 3514 case vmIntrinsics::_getCharStringU : append_char_access(callee, false); return; 3515 case vmIntrinsics::_putCharStringU : append_char_access(callee, true); return; 3516 default: 3517 break; 3518 } 3519 3520 // create intrinsic node 3521 const bool has_receiver = !callee->is_static(); 3522 ValueType* result_type = as_ValueType(callee->return_type()); 3523 ValueStack* state_before = copy_state_for_exception(); 3524 3525 Values* args = state()->pop_arguments(callee->arg_size()); 3526 3527 if (is_profiling()) { 3528 // Don't profile in the special case where the root method 3529 // is the intrinsic 3530 if (callee != method()) { 3531 // Note that we'd collect profile data in this method if we wanted it. 3532 compilation()->set_would_profile(true); 3533 if (profile_calls()) { 3534 Value recv = NULL; 3535 if (has_receiver) { 3536 recv = args->at(0); 3537 null_check(recv); 3538 } 3539 profile_call(callee, recv, NULL, collect_args_for_profiling(args, callee, true), true); 3540 } 3541 } 3542 } 3543 3544 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), 3545 args, has_receiver, state_before, 3546 vmIntrinsics::preserves_state(id), 3547 vmIntrinsics::can_trap(id)); 3548 // append instruction & push result 3549 Value value = append_split(result); 3550 if (result_type != voidType && !ignore_return) { 3551 push(result_type, value); 3552 } 3553 3554 if (callee != method() && profile_return() && result_type->is_object_kind()) { 3555 profile_return_type(result, callee); 3556 } 3557 } 3558 3559 bool GraphBuilder::try_inline_intrinsics(ciMethod* callee, bool ignore_return) { 3560 // Not a trivial method because C2 may do intrinsics better. 3561 compilation()->set_would_profile(true); 3562 3563 // For calling is_intrinsic_available we need to transition to 3564 // the '_thread_in_vm' state because is_intrinsic_available() 3565 // accesses critical VM-internal data. 3566 bool is_available = false; 3567 { 3568 VM_ENTRY_MARK; 3569 methodHandle mh(THREAD, callee->get_Method()); 3570 is_available = _compilation->compiler()->is_intrinsic_available(mh, _compilation->directive()); 3571 } 3572 3573 if (!is_available) { 3574 if (!InlineNatives) { 3575 // Return false and also set message that the inlining of 3576 // intrinsics has been disabled in general. 3577 INLINE_BAILOUT("intrinsic method inlining disabled"); 3578 } else { 3579 return false; 3580 } 3581 } 3582 build_graph_for_intrinsic(callee, ignore_return); 3583 return true; 3584 } 3585 3586 3587 bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) { 3588 // Introduce a new callee continuation point - all Ret instructions 3589 // will be replaced with Gotos to this point. 3590 BlockBegin* cont = block_at(next_bci()); 3591 assert(cont != NULL, "continuation must exist (BlockListBuilder starts a new block after a jsr"); 3592 3593 // Note: can not assign state to continuation yet, as we have to 3594 // pick up the state from the Ret instructions. 3595 3596 // Push callee scope 3597 push_scope_for_jsr(cont, jsr_dest_bci); 3598 3599 // Temporarily set up bytecode stream so we can append instructions 3600 // (only using the bci of this stream) 3601 scope_data()->set_stream(scope_data()->parent()->stream()); 3602 3603 BlockBegin* jsr_start_block = block_at(jsr_dest_bci); 3604 assert(jsr_start_block != NULL, "jsr start block must exist"); 3605 assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet"); 3606 Goto* goto_sub = new Goto(jsr_start_block, false); 3607 // Must copy state to avoid wrong sharing when parsing bytecodes 3608 assert(jsr_start_block->state() == NULL, "should have fresh jsr starting block"); 3609 jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci)); 3610 append(goto_sub); 3611 _block->set_end(goto_sub); 3612 _last = _block = jsr_start_block; 3613 3614 // Clear out bytecode stream 3615 scope_data()->set_stream(NULL); 3616 3617 scope_data()->add_to_work_list(jsr_start_block); 3618 3619 // Ready to resume parsing in subroutine 3620 iterate_all_blocks(); 3621 3622 // If we bailed out during parsing, return immediately (this is bad news) 3623 CHECK_BAILOUT_(false); 3624 3625 // Detect whether the continuation can actually be reached. If not, 3626 // it has not had state set by the join() operations in 3627 // iterate_bytecodes_for_block()/ret() and we should not touch the 3628 // iteration state. The calling activation of 3629 // iterate_bytecodes_for_block will then complete normally. 3630 if (cont->state() != NULL) { 3631 if (!cont->is_set(BlockBegin::was_visited_flag)) { 3632 // add continuation to work list instead of parsing it immediately 3633 scope_data()->parent()->add_to_work_list(cont); 3634 } 3635 } 3636 3637 assert(jsr_continuation() == cont, "continuation must not have changed"); 3638 assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) || 3639 jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag), 3640 "continuation can only be visited in case of backward branches"); 3641 assert(_last && _last->as_BlockEnd(), "block must have end"); 3642 3643 // continuation is in work list, so end iteration of current block 3644 _skip_block = true; 3645 pop_scope_for_jsr(); 3646 3647 return true; 3648 } 3649 3650 3651 // Inline the entry of a synchronized method as a monitor enter and 3652 // register the exception handler which releases the monitor if an 3653 // exception is thrown within the callee. Note that the monitor enter 3654 // cannot throw an exception itself, because the receiver is 3655 // guaranteed to be non-null by the explicit null check at the 3656 // beginning of inlining. 3657 void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) { 3658 assert(lock != NULL && sync_handler != NULL, "lock or handler missing"); 3659 3660 monitorenter(lock, SynchronizationEntryBCI); 3661 assert(_last->as_MonitorEnter() != NULL, "monitor enter expected"); 3662 _last->set_needs_null_check(false); 3663 3664 sync_handler->set(BlockBegin::exception_entry_flag); 3665 sync_handler->set(BlockBegin::is_on_work_list_flag); 3666 3667 ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0); 3668 XHandler* h = new XHandler(desc); 3669 h->set_entry_block(sync_handler); 3670 scope_data()->xhandlers()->append(h); 3671 scope_data()->set_has_handler(); 3672 } 3673 3674 3675 // If an exception is thrown and not handled within an inlined 3676 // synchronized method, the monitor must be released before the 3677 // exception is rethrown in the outer scope. Generate the appropriate 3678 // instructions here. 3679 void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) { 3680 BlockBegin* orig_block = _block; 3681 ValueStack* orig_state = _state; 3682 Instruction* orig_last = _last; 3683 _last = _block = sync_handler; 3684 _state = sync_handler->state()->copy(); 3685 3686 assert(sync_handler != NULL, "handler missing"); 3687 assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here"); 3688 3689 assert(lock != NULL || default_handler, "lock or handler missing"); 3690 3691 XHandler* h = scope_data()->xhandlers()->remove_last(); 3692 assert(h->entry_block() == sync_handler, "corrupt list of handlers"); 3693 3694 block()->set(BlockBegin::was_visited_flag); 3695 Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI); 3696 assert(exception->is_pinned(), "must be"); 3697 3698 int bci = SynchronizationEntryBCI; 3699 if (compilation()->env()->dtrace_method_probes()) { 3700 // Report exit from inline methods. We don't have a stream here 3701 // so pass an explicit bci of SynchronizationEntryBCI. 3702 Values* args = new Values(1); 3703 args->push(append_with_bci(new Constant(new MethodConstant(method())), bci)); 3704 append_with_bci(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args), bci); 3705 } 3706 3707 if (lock) { 3708 assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing"); 3709 if (!lock->is_linked()) { 3710 lock = append_with_bci(lock, bci); 3711 } 3712 3713 // exit the monitor in the context of the synchronized method 3714 monitorexit(lock, bci); 3715 3716 // exit the context of the synchronized method 3717 if (!default_handler) { 3718 pop_scope(); 3719 bci = _state->caller_state()->bci(); 3720 _state = _state->caller_state()->copy_for_parsing(); 3721 } 3722 } 3723 3724 // perform the throw as if at the the call site 3725 apush(exception); 3726 throw_op(bci); 3727 3728 BlockEnd* end = last()->as_BlockEnd(); 3729 block()->set_end(end); 3730 3731 _block = orig_block; 3732 _state = orig_state; 3733 _last = orig_last; 3734 } 3735 3736 3737 bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) { 3738 assert(!callee->is_native(), "callee must not be native"); 3739 if (CompilationPolicy::policy()->should_not_inline(compilation()->env(), callee)) { 3740 INLINE_BAILOUT("inlining prohibited by policy"); 3741 } 3742 // first perform tests of things it's not possible to inline 3743 if (callee->has_exception_handlers() && 3744 !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers"); 3745 if (callee->is_synchronized() && 3746 !InlineSynchronizedMethods ) INLINE_BAILOUT("callee is synchronized"); 3747 if (!callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet"); 3748 if (!callee->has_balanced_monitors()) INLINE_BAILOUT("callee's monitors do not match"); 3749 3750 // Proper inlining of methods with jsrs requires a little more work. 3751 if (callee->has_jsrs() ) INLINE_BAILOUT("jsrs not handled properly by inliner yet"); 3752 3753 // When SSE2 is used on intel, then no special handling is needed 3754 // for strictfp because the enum-constant is fixed at compile time, 3755 // the check for UseSSE2 is needed here 3756 if (strict_fp_requires_explicit_rounding && UseSSE < 2 && method()->is_strict() != callee->is_strict()) { 3757 INLINE_BAILOUT("caller and callee have different strict fp requirements"); 3758 } 3759 3760 if (is_profiling() && !callee->ensure_method_data()) { 3761 INLINE_BAILOUT("mdo allocation failed"); 3762 } 3763 3764 // now perform tests that are based on flag settings 3765 bool inlinee_by_directive = compilation()->directive()->should_inline(callee); 3766 if (callee->force_inline() || inlinee_by_directive) { 3767 if (inline_level() > MaxForceInlineLevel ) INLINE_BAILOUT("MaxForceInlineLevel"); 3768 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep"); 3769 3770 const char* msg = ""; 3771 if (callee->force_inline()) msg = "force inline by annotation"; 3772 if (inlinee_by_directive) msg = "force inline by CompileCommand"; 3773 print_inlining(callee, msg); 3774 } else { 3775 // use heuristic controls on inlining 3776 if (inline_level() > MaxInlineLevel ) INLINE_BAILOUT("inlining too deep"); 3777 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep"); 3778 if (callee->code_size_for_inlining() > max_inline_size() ) INLINE_BAILOUT("callee is too large"); 3779 3780 // don't inline throwable methods unless the inlining tree is rooted in a throwable class 3781 if (callee->name() == ciSymbol::object_initializer_name() && 3782 callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) { 3783 // Throwable constructor call 3784 IRScope* top = scope(); 3785 while (top->caller() != NULL) { 3786 top = top->caller(); 3787 } 3788 if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) { 3789 INLINE_BAILOUT("don't inline Throwable constructors"); 3790 } 3791 } 3792 3793 if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) { 3794 INLINE_BAILOUT("total inlining greater than DesiredMethodLimit"); 3795 } 3796 // printing 3797 print_inlining(callee); 3798 } 3799 3800 // NOTE: Bailouts from this point on, which occur at the 3801 // GraphBuilder level, do not cause bailout just of the inlining but 3802 // in fact of the entire compilation. 3803 3804 BlockBegin* orig_block = block(); 3805 3806 const bool is_invokedynamic = bc == Bytecodes::_invokedynamic; 3807 const bool has_receiver = (bc != Bytecodes::_invokestatic && !is_invokedynamic); 3808 3809 const int args_base = state()->stack_size() - callee->arg_size(); 3810 assert(args_base >= 0, "stack underflow during inlining"); 3811 3812 // Insert null check if necessary 3813 Value recv = NULL; 3814 if (has_receiver) { 3815 // note: null check must happen even if first instruction of callee does 3816 // an implicit null check since the callee is in a different scope 3817 // and we must make sure exception handling does the right thing 3818 assert(!callee->is_static(), "callee must not be static"); 3819 assert(callee->arg_size() > 0, "must have at least a receiver"); 3820 recv = state()->stack_at(args_base); 3821 null_check(recv); 3822 } 3823 3824 if (is_profiling()) { 3825 // Note that we'd collect profile data in this method if we wanted it. 3826 // this may be redundant here... 3827 compilation()->set_would_profile(true); 3828 3829 if (profile_calls()) { 3830 int start = 0; 3831 Values* obj_args = args_list_for_profiling(callee, start, has_receiver); 3832 if (obj_args != NULL) { 3833 int s = obj_args->max_length(); 3834 // if called through method handle invoke, some arguments may have been popped 3835 for (int i = args_base+start, j = 0; j < obj_args->max_length() && i < state()->stack_size(); ) { 3836 Value v = state()->stack_at_inc(i); 3837 if (v->type()->is_object_kind()) { 3838 obj_args->push(v); 3839 j++; 3840 } 3841 } 3842 check_args_for_profiling(obj_args, s); 3843 } 3844 profile_call(callee, recv, holder_known ? callee->holder() : NULL, obj_args, true); 3845 } 3846 } 3847 3848 // Introduce a new callee continuation point - if the callee has 3849 // more than one return instruction or the return does not allow 3850 // fall-through of control flow, all return instructions of the 3851 // callee will need to be replaced by Goto's pointing to this 3852 // continuation point. 3853 BlockBegin* cont = block_at(next_bci()); 3854 bool continuation_existed = true; 3855 if (cont == NULL) { 3856 cont = new BlockBegin(next_bci()); 3857 // low number so that continuation gets parsed as early as possible 3858 cont->set_depth_first_number(0); 3859 if (PrintInitialBlockList) { 3860 tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d", 3861 cont->block_id(), cont->bci(), bci()); 3862 } 3863 continuation_existed = false; 3864 } 3865 // Record number of predecessors of continuation block before 3866 // inlining, to detect if inlined method has edges to its 3867 // continuation after inlining. 3868 int continuation_preds = cont->number_of_preds(); 3869 3870 // Push callee scope 3871 push_scope(callee, cont); 3872 3873 // the BlockListBuilder for the callee could have bailed out 3874 if (bailed_out()) 3875 return false; 3876 3877 // Temporarily set up bytecode stream so we can append instructions 3878 // (only using the bci of this stream) 3879 scope_data()->set_stream(scope_data()->parent()->stream()); 3880 3881 // Pass parameters into callee state: add assignments 3882 // note: this will also ensure that all arguments are computed before being passed 3883 ValueStack* callee_state = state(); 3884 ValueStack* caller_state = state()->caller_state(); 3885 for (int i = args_base; i < caller_state->stack_size(); ) { 3886 const int arg_no = i - args_base; 3887 Value arg = caller_state->stack_at_inc(i); 3888 store_local(callee_state, arg, arg_no); 3889 } 3890 3891 // Remove args from stack. 3892 // Note that we preserve locals state in case we can use it later 3893 // (see use of pop_scope() below) 3894 caller_state->truncate_stack(args_base); 3895 assert(callee_state->stack_size() == 0, "callee stack must be empty"); 3896 3897 Value lock = NULL; 3898 BlockBegin* sync_handler = NULL; 3899 3900 // Inline the locking of the receiver if the callee is synchronized 3901 if (callee->is_synchronized()) { 3902 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror()))) 3903 : state()->local_at(0); 3904 sync_handler = new BlockBegin(SynchronizationEntryBCI); 3905 inline_sync_entry(lock, sync_handler); 3906 } 3907 3908 if (compilation()->env()->dtrace_method_probes()) { 3909 Values* args = new Values(1); 3910 args->push(append(new Constant(new MethodConstant(method())))); 3911 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args)); 3912 } 3913 3914 if (profile_inlined_calls()) { 3915 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI)); 3916 } 3917 3918 BlockBegin* callee_start_block = block_at(0); 3919 if (callee_start_block != NULL) { 3920 assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header"); 3921 Goto* goto_callee = new Goto(callee_start_block, false); 3922 // The state for this goto is in the scope of the callee, so use 3923 // the entry bci for the callee instead of the call site bci. 3924 append_with_bci(goto_callee, 0); 3925 _block->set_end(goto_callee); 3926 callee_start_block->merge(callee_state); 3927 3928 _last = _block = callee_start_block; 3929 3930 scope_data()->add_to_work_list(callee_start_block); 3931 } 3932 3933 // Clear out bytecode stream 3934 scope_data()->set_stream(NULL); 3935 scope_data()->set_ignore_return(ignore_return); 3936 3937 CompileLog* log = compilation()->log(); 3938 if (log != NULL) log->head("parse method='%d'", log->identify(callee)); 3939 3940 // Ready to resume parsing in callee (either in the same block we 3941 // were in before or in the callee's start block) 3942 iterate_all_blocks(callee_start_block == NULL); 3943 3944 if (log != NULL) log->done("parse"); 3945 3946 // If we bailed out during parsing, return immediately (this is bad news) 3947 if (bailed_out()) 3948 return false; 3949 3950 // iterate_all_blocks theoretically traverses in random order; in 3951 // practice, we have only traversed the continuation if we are 3952 // inlining into a subroutine 3953 assert(continuation_existed || 3954 !continuation()->is_set(BlockBegin::was_visited_flag), 3955 "continuation should not have been parsed yet if we created it"); 3956 3957 // At this point we are almost ready to return and resume parsing of 3958 // the caller back in the GraphBuilder. The only thing we want to do 3959 // first is an optimization: during parsing of the callee we 3960 // generated at least one Goto to the continuation block. If we 3961 // generated exactly one, and if the inlined method spanned exactly 3962 // one block (and we didn't have to Goto its entry), then we snip 3963 // off the Goto to the continuation, allowing control to fall 3964 // through back into the caller block and effectively performing 3965 // block merging. This allows load elimination and CSE to take place 3966 // across multiple callee scopes if they are relatively simple, and 3967 // is currently essential to making inlining profitable. 3968 if (num_returns() == 1 3969 && block() == orig_block 3970 && block() == inline_cleanup_block()) { 3971 _last = inline_cleanup_return_prev(); 3972 _state = inline_cleanup_state(); 3973 } else if (continuation_preds == cont->number_of_preds()) { 3974 // Inlining caused that the instructions after the invoke in the 3975 // caller are not reachable any more. So skip filling this block 3976 // with instructions! 3977 assert(cont == continuation(), ""); 3978 assert(_last && _last->as_BlockEnd(), ""); 3979 _skip_block = true; 3980 } else { 3981 // Resume parsing in continuation block unless it was already parsed. 3982 // Note that if we don't change _last here, iteration in 3983 // iterate_bytecodes_for_block will stop when we return. 3984 if (!continuation()->is_set(BlockBegin::was_visited_flag)) { 3985 // add continuation to work list instead of parsing it immediately 3986 assert(_last && _last->as_BlockEnd(), ""); 3987 scope_data()->parent()->add_to_work_list(continuation()); 3988 _skip_block = true; 3989 } 3990 } 3991 3992 // Fill the exception handler for synchronized methods with instructions 3993 if (callee->is_synchronized() && sync_handler->state() != NULL) { 3994 fill_sync_handler(lock, sync_handler); 3995 } else { 3996 pop_scope(); 3997 } 3998 3999 compilation()->notice_inlined_method(callee); 4000 4001 return true; 4002 } 4003 4004 4005 bool GraphBuilder::try_method_handle_inline(ciMethod* callee, bool ignore_return) { 4006 ValueStack* state_before = copy_state_before(); 4007 vmIntrinsics::ID iid = callee->intrinsic_id(); 4008 switch (iid) { 4009 case vmIntrinsics::_invokeBasic: 4010 { 4011 // get MethodHandle receiver 4012 const int args_base = state()->stack_size() - callee->arg_size(); 4013 ValueType* type = state()->stack_at(args_base)->type(); 4014 if (type->is_constant()) { 4015 ciMethod* target = type->as_ObjectType()->constant_value()->as_method_handle()->get_vmtarget(); 4016 // We don't do CHA here so only inline static and statically bindable methods. 4017 if (target->is_static() || target->can_be_statically_bound()) { 4018 if (ciMethod::is_consistent_info(callee, target)) { 4019 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual; 4020 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void()); 4021 if (try_inline(target, /*holder_known*/ true, ignore_return, bc)) { 4022 return true; 4023 } 4024 } else { 4025 print_inlining(target, "signatures mismatch", /*success*/ false); 4026 } 4027 } else { 4028 print_inlining(target, "not static or statically bindable", /*success*/ false); 4029 } 4030 } else { 4031 print_inlining(callee, "receiver not constant", /*success*/ false); 4032 } 4033 } 4034 break; 4035 4036 case vmIntrinsics::_linkToVirtual: 4037 case vmIntrinsics::_linkToStatic: 4038 case vmIntrinsics::_linkToSpecial: 4039 case vmIntrinsics::_linkToInterface: 4040 { 4041 // pop MemberName argument 4042 const int args_base = state()->stack_size() - callee->arg_size(); 4043 ValueType* type = apop()->type(); 4044 if (type->is_constant()) { 4045 ciMethod* target = type->as_ObjectType()->constant_value()->as_member_name()->get_vmtarget(); 4046 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void()); 4047 // If the target is another method handle invoke, try to recursively get 4048 // a better target. 4049 if (target->is_method_handle_intrinsic()) { 4050 if (try_method_handle_inline(target, ignore_return)) { 4051 return true; 4052 } 4053 } else if (!ciMethod::is_consistent_info(callee, target)) { 4054 print_inlining(target, "signatures mismatch", /*success*/ false); 4055 } else { 4056 ciSignature* signature = target->signature(); 4057 const int receiver_skip = target->is_static() ? 0 : 1; 4058 // Cast receiver to its type. 4059 if (!target->is_static()) { 4060 ciKlass* tk = signature->accessing_klass(); 4061 Value obj = state()->stack_at(args_base); 4062 if (obj->exact_type() == NULL && 4063 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) { 4064 TypeCast* c = new TypeCast(tk, obj, state_before); 4065 append(c); 4066 state()->stack_at_put(args_base, c); 4067 } 4068 } 4069 // Cast reference arguments to its type. 4070 for (int i = 0, j = 0; i < signature->count(); i++) { 4071 ciType* t = signature->type_at(i); 4072 if (t->is_klass()) { 4073 ciKlass* tk = t->as_klass(); 4074 Value obj = state()->stack_at(args_base + receiver_skip + j); 4075 if (obj->exact_type() == NULL && 4076 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) { 4077 TypeCast* c = new TypeCast(t, obj, state_before); 4078 append(c); 4079 state()->stack_at_put(args_base + receiver_skip + j, c); 4080 } 4081 } 4082 j += t->size(); // long and double take two slots 4083 } 4084 // We don't do CHA here so only inline static and statically bindable methods. 4085 if (target->is_static() || target->can_be_statically_bound()) { 4086 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual; 4087 if (try_inline(target, /*holder_known*/ true, ignore_return, bc)) { 4088 return true; 4089 } 4090 } else { 4091 print_inlining(target, "not static or statically bindable", /*success*/ false); 4092 } 4093 } 4094 } else { 4095 print_inlining(callee, "MemberName not constant", /*success*/ false); 4096 } 4097 } 4098 break; 4099 4100 default: 4101 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)); 4102 break; 4103 } 4104 set_state(state_before->copy_for_parsing()); 4105 return false; 4106 } 4107 4108 4109 void GraphBuilder::inline_bailout(const char* msg) { 4110 assert(msg != NULL, "inline bailout msg must exist"); 4111 _inline_bailout_msg = msg; 4112 } 4113 4114 4115 void GraphBuilder::clear_inline_bailout() { 4116 _inline_bailout_msg = NULL; 4117 } 4118 4119 4120 void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) { 4121 ScopeData* data = new ScopeData(NULL); 4122 data->set_scope(scope); 4123 data->set_bci2block(bci2block); 4124 _scope_data = data; 4125 _block = start; 4126 } 4127 4128 4129 void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) { 4130 IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false); 4131 scope()->add_callee(callee_scope); 4132 4133 BlockListBuilder blb(compilation(), callee_scope, -1); 4134 CHECK_BAILOUT(); 4135 4136 if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) { 4137 // this scope can be inlined directly into the caller so remove 4138 // the block at bci 0. 4139 blb.bci2block()->at_put(0, NULL); 4140 } 4141 4142 set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci()))); 4143 4144 ScopeData* data = new ScopeData(scope_data()); 4145 data->set_scope(callee_scope); 4146 data->set_bci2block(blb.bci2block()); 4147 data->set_continuation(continuation); 4148 _scope_data = data; 4149 } 4150 4151 4152 void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) { 4153 ScopeData* data = new ScopeData(scope_data()); 4154 data->set_parsing_jsr(); 4155 data->set_jsr_entry_bci(jsr_dest_bci); 4156 data->set_jsr_return_address_local(-1); 4157 // Must clone bci2block list as we will be mutating it in order to 4158 // properly clone all blocks in jsr region as well as exception 4159 // handlers containing rets 4160 BlockList* new_bci2block = new BlockList(bci2block()->length()); 4161 new_bci2block->appendAll(bci2block()); 4162 data->set_bci2block(new_bci2block); 4163 data->set_scope(scope()); 4164 data->setup_jsr_xhandlers(); 4165 data->set_continuation(continuation()); 4166 data->set_jsr_continuation(jsr_continuation); 4167 _scope_data = data; 4168 } 4169 4170 4171 void GraphBuilder::pop_scope() { 4172 int number_of_locks = scope()->number_of_locks(); 4173 _scope_data = scope_data()->parent(); 4174 // accumulate minimum number of monitor slots to be reserved 4175 scope()->set_min_number_of_locks(number_of_locks); 4176 } 4177 4178 4179 void GraphBuilder::pop_scope_for_jsr() { 4180 _scope_data = scope_data()->parent(); 4181 } 4182 4183 void GraphBuilder::append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile) { 4184 Values* args = state()->pop_arguments(callee->arg_size()); 4185 null_check(args->at(0)); 4186 Instruction* offset = args->at(2); 4187 #ifndef _LP64 4188 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4189 #endif 4190 Instruction* op = append(new UnsafeGetObject(t, args->at(1), offset, is_volatile)); 4191 push(op->type(), op); 4192 compilation()->set_has_unsafe_access(true); 4193 } 4194 4195 4196 void GraphBuilder::append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile) { 4197 Values* args = state()->pop_arguments(callee->arg_size()); 4198 null_check(args->at(0)); 4199 Instruction* offset = args->at(2); 4200 #ifndef _LP64 4201 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4202 #endif 4203 Value val = args->at(3); 4204 if (t == T_BOOLEAN) { 4205 Value mask = append(new Constant(new IntConstant(1))); 4206 val = append(new LogicOp(Bytecodes::_iand, val, mask)); 4207 } 4208 Instruction* op = append(new UnsafePutObject(t, args->at(1), offset, val, is_volatile)); 4209 compilation()->set_has_unsafe_access(true); 4210 kill_all(); 4211 } 4212 4213 4214 void GraphBuilder::append_unsafe_get_raw(ciMethod* callee, BasicType t) { 4215 Values* args = state()->pop_arguments(callee->arg_size()); 4216 null_check(args->at(0)); 4217 Instruction* op = append(new UnsafeGetRaw(t, args->at(1), false)); 4218 push(op->type(), op); 4219 compilation()->set_has_unsafe_access(true); 4220 } 4221 4222 4223 void GraphBuilder::append_unsafe_put_raw(ciMethod* callee, BasicType t) { 4224 Values* args = state()->pop_arguments(callee->arg_size()); 4225 null_check(args->at(0)); 4226 Instruction* op = append(new UnsafePutRaw(t, args->at(1), args->at(2))); 4227 compilation()->set_has_unsafe_access(true); 4228 } 4229 4230 4231 void GraphBuilder::append_unsafe_CAS(ciMethod* callee) { 4232 ValueStack* state_before = copy_state_for_exception(); 4233 ValueType* result_type = as_ValueType(callee->return_type()); 4234 assert(result_type->is_int(), "int result"); 4235 Values* args = state()->pop_arguments(callee->arg_size()); 4236 4237 // Pop off some args to specially handle, then push back 4238 Value newval = args->pop(); 4239 Value cmpval = args->pop(); 4240 Value offset = args->pop(); 4241 Value src = args->pop(); 4242 Value unsafe_obj = args->pop(); 4243 4244 // Separately handle the unsafe arg. It is not needed for code 4245 // generation, but must be null checked 4246 null_check(unsafe_obj); 4247 4248 #ifndef _LP64 4249 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4250 #endif 4251 4252 args->push(src); 4253 args->push(offset); 4254 args->push(cmpval); 4255 args->push(newval); 4256 4257 // An unsafe CAS can alias with other field accesses, but we don't 4258 // know which ones so mark the state as no preserved. This will 4259 // cause CSE to invalidate memory across it. 4260 bool preserves_state = false; 4261 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state); 4262 append_split(result); 4263 push(result_type, result); 4264 compilation()->set_has_unsafe_access(true); 4265 } 4266 4267 void GraphBuilder::append_char_access(ciMethod* callee, bool is_store) { 4268 // This intrinsic accesses byte[] array as char[] array. Computing the offsets 4269 // correctly requires matched array shapes. 4270 assert (arrayOopDesc::base_offset_in_bytes(T_CHAR) == arrayOopDesc::base_offset_in_bytes(T_BYTE), 4271 "sanity: byte[] and char[] bases agree"); 4272 assert (type2aelembytes(T_CHAR) == type2aelembytes(T_BYTE)*2, 4273 "sanity: byte[] and char[] scales agree"); 4274 4275 ValueStack* state_before = copy_state_indexed_access(); 4276 compilation()->set_has_access_indexed(true); 4277 Values* args = state()->pop_arguments(callee->arg_size()); 4278 Value array = args->at(0); 4279 Value index = args->at(1); 4280 if (is_store) { 4281 Value value = args->at(2); 4282 Instruction* store = append(new StoreIndexed(array, index, NULL, T_CHAR, value, state_before, false, true)); 4283 store->set_flag(Instruction::NeedsRangeCheckFlag, false); 4284 _memory->store_value(value); 4285 } else { 4286 Instruction* load = append(new LoadIndexed(array, index, NULL, T_CHAR, state_before, true)); 4287 load->set_flag(Instruction::NeedsRangeCheckFlag, false); 4288 push(load->type(), load); 4289 } 4290 } 4291 4292 void GraphBuilder::print_inlining(ciMethod* callee, const char* msg, bool success) { 4293 CompileLog* log = compilation()->log(); 4294 if (log != NULL) { 4295 if (success) { 4296 if (msg != NULL) 4297 log->inline_success(msg); 4298 else 4299 log->inline_success("receiver is statically known"); 4300 } else { 4301 if (msg != NULL) 4302 log->inline_fail(msg); 4303 else 4304 log->inline_fail("reason unknown"); 4305 } 4306 } 4307 #if INCLUDE_TRACE 4308 EventCompilerInlining event; 4309 if (event.should_commit()) { 4310 event.set_compileId(compilation()->env()->task()->compile_id()); 4311 event.set_message(msg); 4312 event.set_succeeded(success); 4313 event.set_bci(bci()); 4314 event.set_caller(method()->get_Method()); 4315 event.set_callee(callee->to_trace_struct()); 4316 event.commit(); 4317 } 4318 #endif // INCLUDE_TRACE 4319 4320 CompileTask::print_inlining_ul(callee, scope()->level(), bci(), msg); 4321 4322 if (!compilation()->directive()->PrintInliningOption) { 4323 return; 4324 } 4325 CompileTask::print_inlining_tty(callee, scope()->level(), bci(), msg); 4326 if (success && CIPrintMethodCodes) { 4327 callee->print_codes(); 4328 } 4329 } 4330 4331 void GraphBuilder::append_unsafe_get_and_set_obj(ciMethod* callee, bool is_add) { 4332 Values* args = state()->pop_arguments(callee->arg_size()); 4333 BasicType t = callee->return_type()->basic_type(); 4334 null_check(args->at(0)); 4335 Instruction* offset = args->at(2); 4336 #ifndef _LP64 4337 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4338 #endif 4339 Instruction* op = append(new UnsafeGetAndSetObject(t, args->at(1), offset, args->at(3), is_add)); 4340 compilation()->set_has_unsafe_access(true); 4341 kill_all(); 4342 push(op->type(), op); 4343 } 4344 4345 #ifndef PRODUCT 4346 void GraphBuilder::print_stats() { 4347 vmap()->print(); 4348 } 4349 #endif // PRODUCT 4350 4351 void GraphBuilder::profile_call(ciMethod* callee, Value recv, ciKlass* known_holder, Values* obj_args, bool inlined) { 4352 assert(known_holder == NULL || (known_holder->is_instance_klass() && 4353 (!known_holder->is_interface() || 4354 ((ciInstanceKlass*)known_holder)->has_nonstatic_concrete_methods())), "should be non-static concrete method"); 4355 if (known_holder != NULL) { 4356 if (known_holder->exact_klass() == NULL) { 4357 known_holder = compilation()->cha_exact_type(known_holder); 4358 } 4359 } 4360 4361 append(new ProfileCall(method(), bci(), callee, recv, known_holder, obj_args, inlined)); 4362 } 4363 4364 void GraphBuilder::profile_return_type(Value ret, ciMethod* callee, ciMethod* m, int invoke_bci) { 4365 assert((m == NULL) == (invoke_bci < 0), "invalid method and invalid bci together"); 4366 if (m == NULL) { 4367 m = method(); 4368 } 4369 if (invoke_bci < 0) { 4370 invoke_bci = bci(); 4371 } 4372 ciMethodData* md = m->method_data_or_null(); 4373 ciProfileData* data = md->bci_to_data(invoke_bci); 4374 if (data != NULL && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) { 4375 bool has_return = data->is_CallTypeData() ? ((ciCallTypeData*)data)->has_return() : ((ciVirtualCallTypeData*)data)->has_return(); 4376 if (has_return) { 4377 append(new ProfileReturnType(m , invoke_bci, callee, ret)); 4378 } 4379 } 4380 } 4381 4382 void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) { 4383 append(new ProfileInvoke(callee, state)); 4384 }