1 /* 2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "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 // FIXME: an unresolved Dynamic constant can get here, 878 // and that should not terminate the whole compilation. 879 BAILOUT("could not resolve a constant"); 880 } else { 881 ValueType* t = illegalType; 882 ValueStack* patch_state = NULL; 883 switch (con.basic_type()) { 884 case T_BOOLEAN: t = new IntConstant (con.as_boolean()); break; 885 case T_BYTE : t = new IntConstant (con.as_byte ()); break; 886 case T_CHAR : t = new IntConstant (con.as_char ()); break; 887 case T_SHORT : t = new IntConstant (con.as_short ()); break; 888 case T_INT : t = new IntConstant (con.as_int ()); break; 889 case T_LONG : t = new LongConstant (con.as_long ()); break; 890 case T_FLOAT : t = new FloatConstant (con.as_float ()); break; 891 case T_DOUBLE : t = new DoubleConstant (con.as_double ()); break; 892 case T_ARRAY : t = new ArrayConstant (con.as_object ()->as_array ()); break; 893 case T_OBJECT : 894 { 895 ciObject* obj = con.as_object(); 896 if (!obj->is_loaded() 897 || (PatchALot && obj->klass() != ciEnv::current()->String_klass())) { 898 // A Class, MethodType, MethodHandle, or String. 899 // Unloaded condy nodes show up as T_ILLEGAL, above. 900 patch_state = copy_state_before(); 901 t = new ObjectConstant(obj); 902 } else { 903 // Might be a Class, MethodType, MethodHandle, or Dynamic constant 904 // result, which might turn out to be an array. 905 if (obj->is_null_object()) 906 t = objectNull; 907 else if (obj->is_array()) 908 t = new ArrayConstant(obj->as_array()); 909 else 910 t = new InstanceConstant(obj->as_instance()); 911 } 912 break; 913 } 914 default : ShouldNotReachHere(); 915 } 916 Value x; 917 if (patch_state != NULL) { 918 x = new Constant(t, patch_state); 919 } else { 920 x = new Constant(t); 921 } 922 push(t, append(x)); 923 } 924 } 925 926 927 void GraphBuilder::load_local(ValueType* type, int index) { 928 Value x = state()->local_at(index); 929 assert(x != NULL && !x->type()->is_illegal(), "access of illegal local variable"); 930 push(type, x); 931 } 932 933 934 void GraphBuilder::store_local(ValueType* type, int index) { 935 Value x = pop(type); 936 store_local(state(), x, index); 937 } 938 939 940 void GraphBuilder::store_local(ValueStack* state, Value x, int index) { 941 if (parsing_jsr()) { 942 // We need to do additional tracking of the location of the return 943 // address for jsrs since we don't handle arbitrary jsr/ret 944 // constructs. Here we are figuring out in which circumstances we 945 // need to bail out. 946 if (x->type()->is_address()) { 947 scope_data()->set_jsr_return_address_local(index); 948 949 // Also check parent jsrs (if any) at this time to see whether 950 // they are using this local. We don't handle skipping over a 951 // ret. 952 for (ScopeData* cur_scope_data = scope_data()->parent(); 953 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope(); 954 cur_scope_data = cur_scope_data->parent()) { 955 if (cur_scope_data->jsr_return_address_local() == index) { 956 BAILOUT("subroutine overwrites return address from previous subroutine"); 957 } 958 } 959 } else if (index == scope_data()->jsr_return_address_local()) { 960 scope_data()->set_jsr_return_address_local(-1); 961 } 962 } 963 964 state->store_local(index, round_fp(x)); 965 } 966 967 968 void GraphBuilder::load_indexed(BasicType type) { 969 // In case of in block code motion in range check elimination 970 ValueStack* state_before = copy_state_indexed_access(); 971 compilation()->set_has_access_indexed(true); 972 Value index = ipop(); 973 Value array = apop(); 974 Value length = NULL; 975 if (CSEArrayLength || 976 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) || 977 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) { 978 length = append(new ArrayLength(array, state_before)); 979 } 980 push(as_ValueType(type), append(new LoadIndexed(array, index, length, type, state_before))); 981 } 982 983 984 void GraphBuilder::store_indexed(BasicType type) { 985 // In case of in block code motion in range check elimination 986 ValueStack* state_before = copy_state_indexed_access(); 987 compilation()->set_has_access_indexed(true); 988 Value value = pop(as_ValueType(type)); 989 Value index = ipop(); 990 Value array = apop(); 991 Value length = NULL; 992 if (CSEArrayLength || 993 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) || 994 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) { 995 length = append(new ArrayLength(array, state_before)); 996 } 997 ciType* array_type = array->declared_type(); 998 bool check_boolean = false; 999 if (array_type != NULL) { 1000 if (array_type->is_loaded() && 1001 array_type->as_array_klass()->element_type()->basic_type() == T_BOOLEAN) { 1002 assert(type == T_BYTE, "boolean store uses bastore"); 1003 Value mask = append(new Constant(new IntConstant(1))); 1004 value = append(new LogicOp(Bytecodes::_iand, value, mask)); 1005 } 1006 } else if (type == T_BYTE) { 1007 check_boolean = true; 1008 } 1009 StoreIndexed* result = new StoreIndexed(array, index, length, type, value, state_before, check_boolean); 1010 append(result); 1011 _memory->store_value(value); 1012 1013 if (type == T_OBJECT && is_profiling()) { 1014 // Note that we'd collect profile data in this method if we wanted it. 1015 compilation()->set_would_profile(true); 1016 1017 if (profile_checkcasts()) { 1018 result->set_profiled_method(method()); 1019 result->set_profiled_bci(bci()); 1020 result->set_should_profile(true); 1021 } 1022 } 1023 } 1024 1025 1026 void GraphBuilder::stack_op(Bytecodes::Code code) { 1027 switch (code) { 1028 case Bytecodes::_pop: 1029 { state()->raw_pop(); 1030 } 1031 break; 1032 case Bytecodes::_pop2: 1033 { state()->raw_pop(); 1034 state()->raw_pop(); 1035 } 1036 break; 1037 case Bytecodes::_dup: 1038 { Value w = state()->raw_pop(); 1039 state()->raw_push(w); 1040 state()->raw_push(w); 1041 } 1042 break; 1043 case Bytecodes::_dup_x1: 1044 { Value w1 = state()->raw_pop(); 1045 Value w2 = state()->raw_pop(); 1046 state()->raw_push(w1); 1047 state()->raw_push(w2); 1048 state()->raw_push(w1); 1049 } 1050 break; 1051 case Bytecodes::_dup_x2: 1052 { Value w1 = state()->raw_pop(); 1053 Value w2 = state()->raw_pop(); 1054 Value w3 = state()->raw_pop(); 1055 state()->raw_push(w1); 1056 state()->raw_push(w3); 1057 state()->raw_push(w2); 1058 state()->raw_push(w1); 1059 } 1060 break; 1061 case Bytecodes::_dup2: 1062 { Value w1 = state()->raw_pop(); 1063 Value w2 = state()->raw_pop(); 1064 state()->raw_push(w2); 1065 state()->raw_push(w1); 1066 state()->raw_push(w2); 1067 state()->raw_push(w1); 1068 } 1069 break; 1070 case Bytecodes::_dup2_x1: 1071 { Value w1 = state()->raw_pop(); 1072 Value w2 = state()->raw_pop(); 1073 Value w3 = state()->raw_pop(); 1074 state()->raw_push(w2); 1075 state()->raw_push(w1); 1076 state()->raw_push(w3); 1077 state()->raw_push(w2); 1078 state()->raw_push(w1); 1079 } 1080 break; 1081 case Bytecodes::_dup2_x2: 1082 { Value w1 = state()->raw_pop(); 1083 Value w2 = state()->raw_pop(); 1084 Value w3 = state()->raw_pop(); 1085 Value w4 = state()->raw_pop(); 1086 state()->raw_push(w2); 1087 state()->raw_push(w1); 1088 state()->raw_push(w4); 1089 state()->raw_push(w3); 1090 state()->raw_push(w2); 1091 state()->raw_push(w1); 1092 } 1093 break; 1094 case Bytecodes::_swap: 1095 { Value w1 = state()->raw_pop(); 1096 Value w2 = state()->raw_pop(); 1097 state()->raw_push(w1); 1098 state()->raw_push(w2); 1099 } 1100 break; 1101 default: 1102 ShouldNotReachHere(); 1103 break; 1104 } 1105 } 1106 1107 1108 void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) { 1109 Value y = pop(type); 1110 Value x = pop(type); 1111 // NOTE: strictfp can be queried from current method since we don't 1112 // inline methods with differing strictfp bits 1113 Value res = new ArithmeticOp(code, x, y, method()->is_strict(), state_before); 1114 // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level 1115 res = append(res); 1116 if (method()->is_strict()) { 1117 res = round_fp(res); 1118 } 1119 push(type, res); 1120 } 1121 1122 1123 void GraphBuilder::negate_op(ValueType* type) { 1124 push(type, append(new NegateOp(pop(type)))); 1125 } 1126 1127 1128 void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) { 1129 Value s = ipop(); 1130 Value x = pop(type); 1131 // try to simplify 1132 // Note: This code should go into the canonicalizer as soon as it can 1133 // can handle canonicalized forms that contain more than one node. 1134 if (CanonicalizeNodes && code == Bytecodes::_iushr) { 1135 // pattern: x >>> s 1136 IntConstant* s1 = s->type()->as_IntConstant(); 1137 if (s1 != NULL) { 1138 // pattern: x >>> s1, with s1 constant 1139 ShiftOp* l = x->as_ShiftOp(); 1140 if (l != NULL && l->op() == Bytecodes::_ishl) { 1141 // pattern: (a << b) >>> s1 1142 IntConstant* s0 = l->y()->type()->as_IntConstant(); 1143 if (s0 != NULL) { 1144 // pattern: (a << s0) >>> s1 1145 const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts 1146 const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts 1147 if (s0c == s1c) { 1148 if (s0c == 0) { 1149 // pattern: (a << 0) >>> 0 => simplify to: a 1150 ipush(l->x()); 1151 } else { 1152 // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant 1153 assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases"); 1154 const int m = (1 << (BitsPerInt - s0c)) - 1; 1155 Value s = append(new Constant(new IntConstant(m))); 1156 ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s))); 1157 } 1158 return; 1159 } 1160 } 1161 } 1162 } 1163 } 1164 // could not simplify 1165 push(type, append(new ShiftOp(code, x, s))); 1166 } 1167 1168 1169 void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) { 1170 Value y = pop(type); 1171 Value x = pop(type); 1172 push(type, append(new LogicOp(code, x, y))); 1173 } 1174 1175 1176 void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) { 1177 ValueStack* state_before = copy_state_before(); 1178 Value y = pop(type); 1179 Value x = pop(type); 1180 ipush(append(new CompareOp(code, x, y, state_before))); 1181 } 1182 1183 1184 void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) { 1185 push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to)))); 1186 } 1187 1188 1189 void GraphBuilder::increment() { 1190 int index = stream()->get_index(); 1191 int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]); 1192 load_local(intType, index); 1193 ipush(append(new Constant(new IntConstant(delta)))); 1194 arithmetic_op(intType, Bytecodes::_iadd); 1195 store_local(intType, index); 1196 } 1197 1198 1199 void GraphBuilder::_goto(int from_bci, int to_bci) { 1200 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci); 1201 if (is_profiling()) { 1202 compilation()->set_would_profile(true); 1203 x->set_profiled_bci(bci()); 1204 if (profile_branches()) { 1205 x->set_profiled_method(method()); 1206 x->set_should_profile(true); 1207 } 1208 } 1209 append(x); 1210 } 1211 1212 1213 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) { 1214 BlockBegin* tsux = block_at(stream()->get_dest()); 1215 BlockBegin* fsux = block_at(stream()->next_bci()); 1216 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci(); 1217 // In case of loop invariant code motion or predicate insertion 1218 // before the body of a loop the state is needed 1219 Instruction *i = append(new If(x, cond, false, y, tsux, fsux, (is_bb || compilation()->is_optimistic()) ? state_before : NULL, is_bb)); 1220 1221 assert(i->as_Goto() == NULL || 1222 (i->as_Goto()->sux_at(0) == tsux && i->as_Goto()->is_safepoint() == tsux->bci() < stream()->cur_bci()) || 1223 (i->as_Goto()->sux_at(0) == fsux && i->as_Goto()->is_safepoint() == fsux->bci() < stream()->cur_bci()), 1224 "safepoint state of Goto returned by canonicalizer incorrect"); 1225 1226 if (is_profiling()) { 1227 If* if_node = i->as_If(); 1228 if (if_node != NULL) { 1229 // Note that we'd collect profile data in this method if we wanted it. 1230 compilation()->set_would_profile(true); 1231 // At level 2 we need the proper bci to count backedges 1232 if_node->set_profiled_bci(bci()); 1233 if (profile_branches()) { 1234 // Successors can be rotated by the canonicalizer, check for this case. 1235 if_node->set_profiled_method(method()); 1236 if_node->set_should_profile(true); 1237 if (if_node->tsux() == fsux) { 1238 if_node->set_swapped(true); 1239 } 1240 } 1241 return; 1242 } 1243 1244 // Check if this If was reduced to Goto. 1245 Goto *goto_node = i->as_Goto(); 1246 if (goto_node != NULL) { 1247 compilation()->set_would_profile(true); 1248 goto_node->set_profiled_bci(bci()); 1249 if (profile_branches()) { 1250 goto_node->set_profiled_method(method()); 1251 goto_node->set_should_profile(true); 1252 // Find out which successor is used. 1253 if (goto_node->default_sux() == tsux) { 1254 goto_node->set_direction(Goto::taken); 1255 } else if (goto_node->default_sux() == fsux) { 1256 goto_node->set_direction(Goto::not_taken); 1257 } else { 1258 ShouldNotReachHere(); 1259 } 1260 } 1261 return; 1262 } 1263 } 1264 } 1265 1266 1267 void GraphBuilder::if_zero(ValueType* type, If::Condition cond) { 1268 Value y = append(new Constant(intZero)); 1269 ValueStack* state_before = copy_state_before(); 1270 Value x = ipop(); 1271 if_node(x, cond, y, state_before); 1272 } 1273 1274 1275 void GraphBuilder::if_null(ValueType* type, If::Condition cond) { 1276 Value y = append(new Constant(objectNull)); 1277 ValueStack* state_before = copy_state_before(); 1278 Value x = apop(); 1279 if_node(x, cond, y, state_before); 1280 } 1281 1282 1283 void GraphBuilder::if_same(ValueType* type, If::Condition cond) { 1284 ValueStack* state_before = copy_state_before(); 1285 Value y = pop(type); 1286 Value x = pop(type); 1287 if_node(x, cond, y, state_before); 1288 } 1289 1290 1291 void GraphBuilder::jsr(int dest) { 1292 // We only handle well-formed jsrs (those which are "block-structured"). 1293 // If the bytecodes are strange (jumping out of a jsr block) then we 1294 // might end up trying to re-parse a block containing a jsr which 1295 // has already been activated. Watch for this case and bail out. 1296 for (ScopeData* cur_scope_data = scope_data(); 1297 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope(); 1298 cur_scope_data = cur_scope_data->parent()) { 1299 if (cur_scope_data->jsr_entry_bci() == dest) { 1300 BAILOUT("too-complicated jsr/ret structure"); 1301 } 1302 } 1303 1304 push(addressType, append(new Constant(new AddressConstant(next_bci())))); 1305 if (!try_inline_jsr(dest)) { 1306 return; // bailed out while parsing and inlining subroutine 1307 } 1308 } 1309 1310 1311 void GraphBuilder::ret(int local_index) { 1312 if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine"); 1313 1314 if (local_index != scope_data()->jsr_return_address_local()) { 1315 BAILOUT("can not handle complicated jsr/ret constructs"); 1316 } 1317 1318 // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation 1319 append(new Goto(scope_data()->jsr_continuation(), false)); 1320 } 1321 1322 1323 void GraphBuilder::table_switch() { 1324 Bytecode_tableswitch sw(stream()); 1325 const int l = sw.length(); 1326 if (CanonicalizeNodes && l == 1) { 1327 // total of 2 successors => use If instead of switch 1328 // Note: This code should go into the canonicalizer as soon as it can 1329 // can handle canonicalized forms that contain more than one node. 1330 Value key = append(new Constant(new IntConstant(sw.low_key()))); 1331 BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0)); 1332 BlockBegin* fsux = block_at(bci() + sw.default_offset()); 1333 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci(); 1334 // In case of loop invariant code motion or predicate insertion 1335 // before the body of a loop the state is needed 1336 ValueStack* state_before = copy_state_if_bb(is_bb); 1337 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb)); 1338 } else { 1339 // collect successors 1340 BlockList* sux = new BlockList(l + 1, NULL); 1341 int i; 1342 bool has_bb = false; 1343 for (i = 0; i < l; i++) { 1344 sux->at_put(i, block_at(bci() + sw.dest_offset_at(i))); 1345 if (sw.dest_offset_at(i) < 0) has_bb = true; 1346 } 1347 // add default successor 1348 if (sw.default_offset() < 0) has_bb = true; 1349 sux->at_put(i, block_at(bci() + sw.default_offset())); 1350 // In case of loop invariant code motion or predicate insertion 1351 // before the body of a loop the state is needed 1352 ValueStack* state_before = copy_state_if_bb(has_bb); 1353 Instruction* res = append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb)); 1354 #ifdef ASSERT 1355 if (res->as_Goto()) { 1356 for (i = 0; i < l; i++) { 1357 if (sux->at(i) == res->as_Goto()->sux_at(0)) { 1358 assert(res->as_Goto()->is_safepoint() == sw.dest_offset_at(i) < 0, "safepoint state of Goto returned by canonicalizer incorrect"); 1359 } 1360 } 1361 } 1362 #endif 1363 } 1364 } 1365 1366 1367 void GraphBuilder::lookup_switch() { 1368 Bytecode_lookupswitch sw(stream()); 1369 const int l = sw.number_of_pairs(); 1370 if (CanonicalizeNodes && l == 1) { 1371 // total of 2 successors => use If instead of switch 1372 // Note: This code should go into the canonicalizer as soon as it can 1373 // can handle canonicalized forms that contain more than one node. 1374 // simplify to If 1375 LookupswitchPair pair = sw.pair_at(0); 1376 Value key = append(new Constant(new IntConstant(pair.match()))); 1377 BlockBegin* tsux = block_at(bci() + pair.offset()); 1378 BlockBegin* fsux = block_at(bci() + sw.default_offset()); 1379 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci(); 1380 // In case of loop invariant code motion or predicate insertion 1381 // before the body of a loop the state is needed 1382 ValueStack* state_before = copy_state_if_bb(is_bb);; 1383 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb)); 1384 } else { 1385 // collect successors & keys 1386 BlockList* sux = new BlockList(l + 1, NULL); 1387 intArray* keys = new intArray(l, l, 0); 1388 int i; 1389 bool has_bb = false; 1390 for (i = 0; i < l; i++) { 1391 LookupswitchPair pair = sw.pair_at(i); 1392 if (pair.offset() < 0) has_bb = true; 1393 sux->at_put(i, block_at(bci() + pair.offset())); 1394 keys->at_put(i, pair.match()); 1395 } 1396 // add default successor 1397 if (sw.default_offset() < 0) has_bb = true; 1398 sux->at_put(i, block_at(bci() + sw.default_offset())); 1399 // In case of loop invariant code motion or predicate insertion 1400 // before the body of a loop the state is needed 1401 ValueStack* state_before = copy_state_if_bb(has_bb); 1402 Instruction* res = append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb)); 1403 #ifdef ASSERT 1404 if (res->as_Goto()) { 1405 for (i = 0; i < l; i++) { 1406 if (sux->at(i) == res->as_Goto()->sux_at(0)) { 1407 assert(res->as_Goto()->is_safepoint() == sw.pair_at(i).offset() < 0, "safepoint state of Goto returned by canonicalizer incorrect"); 1408 } 1409 } 1410 } 1411 #endif 1412 } 1413 } 1414 1415 void GraphBuilder::call_register_finalizer() { 1416 // If the receiver requires finalization then emit code to perform 1417 // the registration on return. 1418 1419 // Gather some type information about the receiver 1420 Value receiver = state()->local_at(0); 1421 assert(receiver != NULL, "must have a receiver"); 1422 ciType* declared_type = receiver->declared_type(); 1423 ciType* exact_type = receiver->exact_type(); 1424 if (exact_type == NULL && 1425 receiver->as_Local() && 1426 receiver->as_Local()->java_index() == 0) { 1427 ciInstanceKlass* ik = compilation()->method()->holder(); 1428 if (ik->is_final()) { 1429 exact_type = ik; 1430 } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) { 1431 // test class is leaf class 1432 compilation()->dependency_recorder()->assert_leaf_type(ik); 1433 exact_type = ik; 1434 } else { 1435 declared_type = ik; 1436 } 1437 } 1438 1439 // see if we know statically that registration isn't required 1440 bool needs_check = true; 1441 if (exact_type != NULL) { 1442 needs_check = exact_type->as_instance_klass()->has_finalizer(); 1443 } else if (declared_type != NULL) { 1444 ciInstanceKlass* ik = declared_type->as_instance_klass(); 1445 if (!Dependencies::has_finalizable_subclass(ik)) { 1446 compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik); 1447 needs_check = false; 1448 } 1449 } 1450 1451 if (needs_check) { 1452 // Not a trivial method because C2 can do better with inlined check. 1453 compilation()->set_would_profile(true); 1454 1455 // Perform the registration of finalizable objects. 1456 ValueStack* state_before = copy_state_for_exception(); 1457 load_local(objectType, 0); 1458 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init, 1459 state()->pop_arguments(1), 1460 true, state_before, true)); 1461 } 1462 } 1463 1464 1465 void GraphBuilder::method_return(Value x, bool ignore_return) { 1466 if (RegisterFinalizersAtInit && 1467 method()->intrinsic_id() == vmIntrinsics::_Object_init) { 1468 call_register_finalizer(); 1469 } 1470 1471 bool need_mem_bar = false; 1472 if (method()->name() == ciSymbol::object_initializer_name() && 1473 (scope()->wrote_final() || (AlwaysSafeConstructors && scope()->wrote_fields()) 1474 || (support_IRIW_for_not_multiple_copy_atomic_cpu && scope()->wrote_volatile()) 1475 )){ 1476 need_mem_bar = true; 1477 } 1478 1479 BasicType bt = method()->return_type()->basic_type(); 1480 switch (bt) { 1481 case T_BYTE: 1482 { 1483 Value shift = append(new Constant(new IntConstant(24))); 1484 x = append(new ShiftOp(Bytecodes::_ishl, x, shift)); 1485 x = append(new ShiftOp(Bytecodes::_ishr, x, shift)); 1486 break; 1487 } 1488 case T_SHORT: 1489 { 1490 Value shift = append(new Constant(new IntConstant(16))); 1491 x = append(new ShiftOp(Bytecodes::_ishl, x, shift)); 1492 x = append(new ShiftOp(Bytecodes::_ishr, x, shift)); 1493 break; 1494 } 1495 case T_CHAR: 1496 { 1497 Value mask = append(new Constant(new IntConstant(0xFFFF))); 1498 x = append(new LogicOp(Bytecodes::_iand, x, mask)); 1499 break; 1500 } 1501 case T_BOOLEAN: 1502 { 1503 Value mask = append(new Constant(new IntConstant(1))); 1504 x = append(new LogicOp(Bytecodes::_iand, x, mask)); 1505 break; 1506 } 1507 default: 1508 break; 1509 } 1510 1511 // Check to see whether we are inlining. If so, Return 1512 // instructions become Gotos to the continuation point. 1513 if (continuation() != NULL) { 1514 1515 int invoke_bci = state()->caller_state()->bci(); 1516 1517 if (x != NULL && !ignore_return) { 1518 ciMethod* caller = state()->scope()->caller()->method(); 1519 Bytecodes::Code invoke_raw_bc = caller->raw_code_at_bci(invoke_bci); 1520 if (invoke_raw_bc == Bytecodes::_invokehandle || invoke_raw_bc == Bytecodes::_invokedynamic) { 1521 ciType* declared_ret_type = caller->get_declared_signature_at_bci(invoke_bci)->return_type(); 1522 if (declared_ret_type->is_klass() && x->exact_type() == NULL && 1523 x->declared_type() != declared_ret_type && declared_ret_type != compilation()->env()->Object_klass()) { 1524 x = append(new TypeCast(declared_ret_type->as_klass(), x, copy_state_before())); 1525 } 1526 } 1527 } 1528 1529 assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet"); 1530 1531 if (compilation()->env()->dtrace_method_probes()) { 1532 // Report exit from inline methods 1533 Values* args = new Values(1); 1534 args->push(append(new Constant(new MethodConstant(method())))); 1535 append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args)); 1536 } 1537 1538 // If the inlined method is synchronized, the monitor must be 1539 // released before we jump to the continuation block. 1540 if (method()->is_synchronized()) { 1541 assert(state()->locks_size() == 1, "receiver must be locked here"); 1542 monitorexit(state()->lock_at(0), SynchronizationEntryBCI); 1543 } 1544 1545 if (need_mem_bar) { 1546 append(new MemBar(lir_membar_storestore)); 1547 } 1548 1549 // State at end of inlined method is the state of the caller 1550 // without the method parameters on stack, including the 1551 // return value, if any, of the inlined method on operand stack. 1552 set_state(state()->caller_state()->copy_for_parsing()); 1553 if (x != NULL) { 1554 if (!ignore_return) { 1555 state()->push(x->type(), x); 1556 } 1557 if (profile_return() && x->type()->is_object_kind()) { 1558 ciMethod* caller = state()->scope()->method(); 1559 ciMethodData* md = caller->method_data_or_null(); 1560 ciProfileData* data = md->bci_to_data(invoke_bci); 1561 profile_return_type(x, method(), caller, invoke_bci); 1562 } 1563 } 1564 Goto* goto_callee = new Goto(continuation(), false); 1565 1566 // See whether this is the first return; if so, store off some 1567 // of the state for later examination 1568 if (num_returns() == 0) { 1569 set_inline_cleanup_info(); 1570 } 1571 1572 // The current bci() is in the wrong scope, so use the bci() of 1573 // the continuation point. 1574 append_with_bci(goto_callee, scope_data()->continuation()->bci()); 1575 incr_num_returns(); 1576 return; 1577 } 1578 1579 state()->truncate_stack(0); 1580 if (method()->is_synchronized()) { 1581 // perform the unlocking before exiting the method 1582 Value receiver; 1583 if (!method()->is_static()) { 1584 receiver = _initial_state->local_at(0); 1585 } else { 1586 receiver = append(new Constant(new ClassConstant(method()->holder()))); 1587 } 1588 append_split(new MonitorExit(receiver, state()->unlock())); 1589 } 1590 1591 if (need_mem_bar) { 1592 append(new MemBar(lir_membar_storestore)); 1593 } 1594 1595 assert(!ignore_return, "Ignoring return value works only for inlining"); 1596 append(new Return(x)); 1597 } 1598 1599 Value GraphBuilder::make_constant(ciConstant field_value, ciField* field) { 1600 if (!field_value.is_valid()) return NULL; 1601 1602 BasicType field_type = field_value.basic_type(); 1603 ValueType* value = as_ValueType(field_value); 1604 1605 // Attach dimension info to stable arrays. 1606 if (FoldStableValues && 1607 field->is_stable() && field_type == T_ARRAY && !field_value.is_null_or_zero()) { 1608 ciArray* array = field_value.as_object()->as_array(); 1609 jint dimension = field->type()->as_array_klass()->dimension(); 1610 value = new StableArrayConstant(array, dimension); 1611 } 1612 1613 switch (field_type) { 1614 case T_ARRAY: 1615 case T_OBJECT: 1616 if (field_value.as_object()->should_be_constant()) { 1617 return new Constant(value); 1618 } 1619 return NULL; // Not a constant. 1620 default: 1621 return new Constant(value); 1622 } 1623 } 1624 1625 void GraphBuilder::access_field(Bytecodes::Code code) { 1626 bool will_link; 1627 ciField* field = stream()->get_field(will_link); 1628 ciInstanceKlass* holder = field->holder(); 1629 BasicType field_type = field->type()->basic_type(); 1630 ValueType* type = as_ValueType(field_type); 1631 // call will_link again to determine if the field is valid. 1632 const bool needs_patching = !holder->is_loaded() || 1633 !field->will_link(method(), code) || 1634 PatchALot; 1635 1636 ValueStack* state_before = NULL; 1637 if (!holder->is_initialized() || needs_patching) { 1638 // save state before instruction for debug info when 1639 // deoptimization happens during patching 1640 state_before = copy_state_before(); 1641 } 1642 1643 Value obj = NULL; 1644 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) { 1645 if (state_before != NULL) { 1646 // build a patching constant 1647 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before); 1648 } else { 1649 obj = new Constant(new InstanceConstant(holder->java_mirror())); 1650 } 1651 } 1652 1653 if (field->is_final() && (code == Bytecodes::_putfield)) { 1654 scope()->set_wrote_final(); 1655 } 1656 1657 if (code == Bytecodes::_putfield) { 1658 scope()->set_wrote_fields(); 1659 if (field->is_volatile()) { 1660 scope()->set_wrote_volatile(); 1661 } 1662 } 1663 1664 const int offset = !needs_patching ? field->offset() : -1; 1665 switch (code) { 1666 case Bytecodes::_getstatic: { 1667 // check for compile-time constants, i.e., initialized static final fields 1668 Value constant = NULL; 1669 if (field->is_static_constant() && !PatchALot) { 1670 ciConstant field_value = field->constant_value(); 1671 assert(!field->is_stable() || !field_value.is_null_or_zero(), 1672 "stable static w/ default value shouldn't be a constant"); 1673 constant = make_constant(field_value, field); 1674 } 1675 if (constant != NULL) { 1676 push(type, append(constant)); 1677 } else { 1678 if (state_before == NULL) { 1679 state_before = copy_state_for_exception(); 1680 } 1681 push(type, append(new LoadField(append(obj), offset, field, true, 1682 state_before, needs_patching))); 1683 } 1684 break; 1685 } 1686 case Bytecodes::_putstatic: { 1687 Value val = pop(type); 1688 if (state_before == NULL) { 1689 state_before = copy_state_for_exception(); 1690 } 1691 if (field->type()->basic_type() == T_BOOLEAN) { 1692 Value mask = append(new Constant(new IntConstant(1))); 1693 val = append(new LogicOp(Bytecodes::_iand, val, mask)); 1694 } 1695 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching)); 1696 break; 1697 } 1698 case Bytecodes::_getfield: { 1699 // Check for compile-time constants, i.e., trusted final non-static fields. 1700 Value constant = NULL; 1701 obj = apop(); 1702 ObjectType* obj_type = obj->type()->as_ObjectType(); 1703 if (field->is_constant() && obj_type->is_constant() && !PatchALot) { 1704 ciObject* const_oop = obj_type->constant_value(); 1705 if (!const_oop->is_null_object() && const_oop->is_loaded()) { 1706 ciConstant field_value = field->constant_value_of(const_oop); 1707 if (field_value.is_valid()) { 1708 constant = make_constant(field_value, field); 1709 // For CallSite objects add a dependency for invalidation of the optimization. 1710 if (field->is_call_site_target()) { 1711 ciCallSite* call_site = const_oop->as_call_site(); 1712 if (!call_site->is_constant_call_site()) { 1713 ciMethodHandle* target = field_value.as_object()->as_method_handle(); 1714 dependency_recorder()->assert_call_site_target_value(call_site, target); 1715 } 1716 } 1717 } 1718 } 1719 } 1720 if (constant != NULL) { 1721 push(type, append(constant)); 1722 } else { 1723 if (state_before == NULL) { 1724 state_before = copy_state_for_exception(); 1725 } 1726 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching); 1727 Value replacement = !needs_patching ? _memory->load(load) : load; 1728 if (replacement != load) { 1729 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked"); 1730 push(type, replacement); 1731 } else { 1732 push(type, append(load)); 1733 } 1734 } 1735 break; 1736 } 1737 case Bytecodes::_putfield: { 1738 Value val = pop(type); 1739 obj = apop(); 1740 if (state_before == NULL) { 1741 state_before = copy_state_for_exception(); 1742 } 1743 if (field->type()->basic_type() == T_BOOLEAN) { 1744 Value mask = append(new Constant(new IntConstant(1))); 1745 val = append(new LogicOp(Bytecodes::_iand, val, mask)); 1746 } 1747 StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching); 1748 if (!needs_patching) store = _memory->store(store); 1749 if (store != NULL) { 1750 append(store); 1751 } 1752 break; 1753 } 1754 default: 1755 ShouldNotReachHere(); 1756 break; 1757 } 1758 } 1759 1760 1761 Dependencies* GraphBuilder::dependency_recorder() const { 1762 assert(DeoptC1, "need debug information"); 1763 return compilation()->dependency_recorder(); 1764 } 1765 1766 // How many arguments do we want to profile? 1767 Values* GraphBuilder::args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver) { 1768 int n = 0; 1769 bool has_receiver = may_have_receiver && Bytecodes::has_receiver(method()->java_code_at_bci(bci())); 1770 start = has_receiver ? 1 : 0; 1771 if (profile_arguments()) { 1772 ciProfileData* data = method()->method_data()->bci_to_data(bci()); 1773 if (data != NULL && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) { 1774 n = data->is_CallTypeData() ? data->as_CallTypeData()->number_of_arguments() : data->as_VirtualCallTypeData()->number_of_arguments(); 1775 } 1776 } 1777 // If we are inlining then we need to collect arguments to profile parameters for the target 1778 if (profile_parameters() && target != NULL) { 1779 if (target->method_data() != NULL && target->method_data()->parameters_type_data() != NULL) { 1780 // The receiver is profiled on method entry so it's included in 1781 // the number of parameters but here we're only interested in 1782 // actual arguments. 1783 n = MAX2(n, target->method_data()->parameters_type_data()->number_of_parameters() - start); 1784 } 1785 } 1786 if (n > 0) { 1787 return new Values(n); 1788 } 1789 return NULL; 1790 } 1791 1792 void GraphBuilder::check_args_for_profiling(Values* obj_args, int expected) { 1793 #ifdef ASSERT 1794 bool ignored_will_link; 1795 ciSignature* declared_signature = NULL; 1796 ciMethod* real_target = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature); 1797 assert(expected == obj_args->max_length() || real_target->is_method_handle_intrinsic(), "missed on arg?"); 1798 #endif 1799 } 1800 1801 // Collect arguments that we want to profile in a list 1802 Values* GraphBuilder::collect_args_for_profiling(Values* args, ciMethod* target, bool may_have_receiver) { 1803 int start = 0; 1804 Values* obj_args = args_list_for_profiling(target, start, may_have_receiver); 1805 if (obj_args == NULL) { 1806 return NULL; 1807 } 1808 int s = obj_args->max_length(); 1809 // if called through method handle invoke, some arguments may have been popped 1810 for (int i = start, j = 0; j < s && i < args->length(); i++) { 1811 if (args->at(i)->type()->is_object_kind()) { 1812 obj_args->push(args->at(i)); 1813 j++; 1814 } 1815 } 1816 check_args_for_profiling(obj_args, s); 1817 return obj_args; 1818 } 1819 1820 1821 void GraphBuilder::invoke(Bytecodes::Code code) { 1822 bool will_link; 1823 ciSignature* declared_signature = NULL; 1824 ciMethod* target = stream()->get_method(will_link, &declared_signature); 1825 ciKlass* holder = stream()->get_declared_method_holder(); 1826 const Bytecodes::Code bc_raw = stream()->cur_bc_raw(); 1827 assert(declared_signature != NULL, "cannot be null"); 1828 assert(will_link == target->is_loaded(), ""); 1829 1830 ciInstanceKlass* klass = target->holder(); 1831 assert(!target->is_loaded() || klass->is_loaded(), "loaded target must imply loaded klass"); 1832 1833 // check if CHA possible: if so, change the code to invoke_special 1834 ciInstanceKlass* calling_klass = method()->holder(); 1835 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); 1836 ciInstanceKlass* actual_recv = callee_holder; 1837 1838 CompileLog* log = compilation()->log(); 1839 if (log != NULL) 1840 log->elem("call method='%d' instr='%s'", 1841 log->identify(target), 1842 Bytecodes::name(code)); 1843 1844 // invoke-special-super 1845 if (bc_raw == Bytecodes::_invokespecial && !target->is_object_initializer()) { 1846 ciInstanceKlass* sender_klass = 1847 calling_klass->is_anonymous() ? calling_klass->host_klass() : 1848 calling_klass; 1849 if (sender_klass->is_interface()) { 1850 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1); 1851 Value receiver = state()->stack_at(index); 1852 CheckCast* c = new CheckCast(sender_klass, receiver, copy_state_before()); 1853 c->set_invokespecial_receiver_check(); 1854 state()->stack_at_put(index, append_split(c)); 1855 } 1856 } 1857 1858 // Some methods are obviously bindable without any type checks so 1859 // convert them directly to an invokespecial or invokestatic. 1860 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) { 1861 switch (bc_raw) { 1862 case Bytecodes::_invokevirtual: 1863 code = Bytecodes::_invokespecial; 1864 break; 1865 case Bytecodes::_invokehandle: 1866 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial; 1867 break; 1868 default: 1869 break; 1870 } 1871 } else { 1872 if (bc_raw == Bytecodes::_invokehandle) { 1873 assert(!will_link, "should come here only for unlinked call"); 1874 code = Bytecodes::_invokespecial; 1875 } 1876 } 1877 1878 // Push appendix argument (MethodType, CallSite, etc.), if one. 1879 bool patch_for_appendix = false; 1880 int patching_appendix_arg = 0; 1881 if (Bytecodes::has_optional_appendix(bc_raw) && (!will_link || PatchALot)) { 1882 Value arg = append(new Constant(new ObjectConstant(compilation()->env()->unloaded_ciinstance()), copy_state_before())); 1883 apush(arg); 1884 patch_for_appendix = true; 1885 patching_appendix_arg = (will_link && stream()->has_appendix()) ? 0 : 1; 1886 } else if (stream()->has_appendix()) { 1887 ciObject* appendix = stream()->get_appendix(); 1888 Value arg = append(new Constant(new ObjectConstant(appendix))); 1889 apush(arg); 1890 } 1891 1892 ciMethod* cha_monomorphic_target = NULL; 1893 ciMethod* exact_target = NULL; 1894 Value better_receiver = NULL; 1895 if (UseCHA && DeoptC1 && target->is_loaded() && 1896 !(// %%% FIXME: Are both of these relevant? 1897 target->is_method_handle_intrinsic() || 1898 target->is_compiled_lambda_form()) && 1899 !patch_for_appendix) { 1900 Value receiver = NULL; 1901 ciInstanceKlass* receiver_klass = NULL; 1902 bool type_is_exact = false; 1903 // try to find a precise receiver type 1904 if (will_link && !target->is_static()) { 1905 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1); 1906 receiver = state()->stack_at(index); 1907 ciType* type = receiver->exact_type(); 1908 if (type != NULL && type->is_loaded() && 1909 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) { 1910 receiver_klass = (ciInstanceKlass*) type; 1911 type_is_exact = true; 1912 } 1913 if (type == NULL) { 1914 type = receiver->declared_type(); 1915 if (type != NULL && type->is_loaded() && 1916 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) { 1917 receiver_klass = (ciInstanceKlass*) type; 1918 if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) { 1919 // Insert a dependency on this type since 1920 // find_monomorphic_target may assume it's already done. 1921 dependency_recorder()->assert_leaf_type(receiver_klass); 1922 type_is_exact = true; 1923 } 1924 } 1925 } 1926 } 1927 if (receiver_klass != NULL && type_is_exact && 1928 receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) { 1929 // If we have the exact receiver type we can bind directly to 1930 // the method to call. 1931 exact_target = target->resolve_invoke(calling_klass, receiver_klass); 1932 if (exact_target != NULL) { 1933 target = exact_target; 1934 code = Bytecodes::_invokespecial; 1935 } 1936 } 1937 if (receiver_klass != NULL && 1938 receiver_klass->is_subtype_of(actual_recv) && 1939 actual_recv->is_initialized()) { 1940 actual_recv = receiver_klass; 1941 } 1942 1943 if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) || 1944 (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) { 1945 // Use CHA on the receiver to select a more precise method. 1946 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); 1947 } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != NULL) { 1948 // if there is only one implementor of this interface then we 1949 // may be able bind this invoke directly to the implementing 1950 // klass but we need both a dependence on the single interface 1951 // and on the method we bind to. Additionally since all we know 1952 // about the receiver type is the it's supposed to implement the 1953 // interface we have to insert a check that it's the class we 1954 // expect. Interface types are not checked by the verifier so 1955 // they are roughly equivalent to Object. 1956 ciInstanceKlass* singleton = NULL; 1957 if (target->holder()->nof_implementors() == 1) { 1958 singleton = target->holder()->implementor(); 1959 assert(singleton != NULL && singleton != target->holder(), 1960 "just checking"); 1961 1962 assert(holder->is_interface(), "invokeinterface to non interface?"); 1963 ciInstanceKlass* decl_interface = (ciInstanceKlass*)holder; 1964 // the number of implementors for decl_interface is less or 1965 // equal to the number of implementors for target->holder() so 1966 // if number of implementors of target->holder() == 1 then 1967 // number of implementors for decl_interface is 0 or 1. If 1968 // it's 0 then no class implements decl_interface and there's 1969 // no point in inlining. 1970 if (!holder->is_loaded() || decl_interface->nof_implementors() != 1 || decl_interface->has_nonstatic_concrete_methods()) { 1971 singleton = NULL; 1972 } 1973 } 1974 if (singleton) { 1975 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, target->holder(), singleton); 1976 if (cha_monomorphic_target != NULL) { 1977 // If CHA is able to bind this invoke then update the class 1978 // to match that class, otherwise klass will refer to the 1979 // interface. 1980 klass = cha_monomorphic_target->holder(); 1981 actual_recv = target->holder(); 1982 1983 // insert a check it's really the expected class. 1984 CheckCast* c = new CheckCast(klass, receiver, copy_state_for_exception()); 1985 c->set_incompatible_class_change_check(); 1986 c->set_direct_compare(klass->is_final()); 1987 // pass the result of the checkcast so that the compiler has 1988 // more accurate type info in the inlinee 1989 better_receiver = append_split(c); 1990 } 1991 } 1992 } 1993 } 1994 1995 if (cha_monomorphic_target != NULL) { 1996 if (cha_monomorphic_target->is_abstract()) { 1997 // Do not optimize for abstract methods 1998 cha_monomorphic_target = NULL; 1999 } 2000 } 2001 2002 if (cha_monomorphic_target != NULL) { 2003 if (!(target->is_final_method())) { 2004 // If we inlined because CHA revealed only a single target method, 2005 // then we are dependent on that target method not getting overridden 2006 // by dynamic class loading. Be sure to test the "static" receiver 2007 // dest_method here, as opposed to the actual receiver, which may 2008 // falsely lead us to believe that the receiver is final or private. 2009 dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target); 2010 } 2011 code = Bytecodes::_invokespecial; 2012 } 2013 2014 // check if we could do inlining 2015 if (!PatchALot && Inline && target->is_loaded() && 2016 (klass->is_initialized() || (klass->is_interface() && target->holder()->is_initialized())) 2017 && !patch_for_appendix) { 2018 // callee is known => check if we have static binding 2019 if (code == Bytecodes::_invokestatic || 2020 code == Bytecodes::_invokespecial || 2021 (code == Bytecodes::_invokevirtual && target->is_final_method()) || 2022 code == Bytecodes::_invokedynamic) { 2023 ciMethod* inline_target = (cha_monomorphic_target != NULL) ? cha_monomorphic_target : target; 2024 // static binding => check if callee is ok 2025 bool success = try_inline(inline_target, (cha_monomorphic_target != NULL) || (exact_target != NULL), false, code, better_receiver); 2026 2027 CHECK_BAILOUT(); 2028 clear_inline_bailout(); 2029 2030 if (success) { 2031 // Register dependence if JVMTI has either breakpoint 2032 // setting or hotswapping of methods capabilities since they may 2033 // cause deoptimization. 2034 if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) { 2035 dependency_recorder()->assert_evol_method(inline_target); 2036 } 2037 return; 2038 } 2039 } else { 2040 print_inlining(target, "no static binding", /*success*/ false); 2041 } 2042 } else { 2043 print_inlining(target, "not inlineable", /*success*/ false); 2044 } 2045 2046 // If we attempted an inline which did not succeed because of a 2047 // bailout during construction of the callee graph, the entire 2048 // compilation has to be aborted. This is fairly rare and currently 2049 // seems to only occur for jasm-generated classes which contain 2050 // jsr/ret pairs which are not associated with finally clauses and 2051 // do not have exception handlers in the containing method, and are 2052 // therefore not caught early enough to abort the inlining without 2053 // corrupting the graph. (We currently bail out with a non-empty 2054 // stack at a ret in these situations.) 2055 CHECK_BAILOUT(); 2056 2057 // inlining not successful => standard invoke 2058 ValueType* result_type = as_ValueType(declared_signature->return_type()); 2059 ValueStack* state_before = copy_state_exhandling(); 2060 2061 // The bytecode (code) might change in this method so we are checking this very late. 2062 const bool has_receiver = 2063 code == Bytecodes::_invokespecial || 2064 code == Bytecodes::_invokevirtual || 2065 code == Bytecodes::_invokeinterface; 2066 Values* args = state()->pop_arguments(target->arg_size_no_receiver() + patching_appendix_arg); 2067 Value recv = has_receiver ? apop() : NULL; 2068 int vtable_index = Method::invalid_vtable_index; 2069 2070 #ifdef SPARC 2071 // Currently only supported on Sparc. 2072 // The UseInlineCaches only controls dispatch to invokevirtuals for 2073 // loaded classes which we weren't able to statically bind. 2074 if (!UseInlineCaches && target->is_loaded() && code == Bytecodes::_invokevirtual 2075 && !target->can_be_statically_bound()) { 2076 // Find a vtable index if one is available 2077 // For arrays, callee_holder is Object. Resolving the call with 2078 // Object would allow an illegal call to finalize() on an 2079 // array. We use holder instead: illegal calls to finalize() won't 2080 // be compiled as vtable calls (IC call resolution will catch the 2081 // illegal call) and the few legal calls on array types won't be 2082 // either. 2083 vtable_index = target->resolve_vtable_index(calling_klass, holder); 2084 } 2085 #endif 2086 2087 // A null check is required here (when there is a receiver) for any of the following cases 2088 // - invokespecial, always need a null check. 2089 // - invokevirtual, when the target is final and loaded. Calls to final targets will become optimized 2090 // and require null checking. If the target is loaded a null check is emitted here. 2091 // If the target isn't loaded the null check must happen after the call resolution. We achieve that 2092 // by using the target methods unverified entry point (see CompiledIC::compute_monomorphic_entry). 2093 // (The JVM specification requires that LinkageError must be thrown before a NPE. An unloaded target may 2094 // potentially fail, and can't have the null check before the resolution.) 2095 // - A call that will be profiled. (But we can't add a null check when the target is unloaded, by the same 2096 // reason as above, so calls with a receiver to unloaded targets can't be profiled.) 2097 // 2098 // Normal invokevirtual will perform the null check during lookup 2099 2100 bool need_null_check = (code == Bytecodes::_invokespecial) || 2101 (target->is_loaded() && (target->is_final_method() || (is_profiling() && profile_calls()))); 2102 2103 if (need_null_check) { 2104 if (recv != NULL) { 2105 null_check(recv); 2106 } 2107 2108 if (is_profiling()) { 2109 // Note that we'd collect profile data in this method if we wanted it. 2110 compilation()->set_would_profile(true); 2111 2112 if (profile_calls()) { 2113 assert(cha_monomorphic_target == NULL || exact_target == NULL, "both can not be set"); 2114 ciKlass* target_klass = NULL; 2115 if (cha_monomorphic_target != NULL) { 2116 target_klass = cha_monomorphic_target->holder(); 2117 } else if (exact_target != NULL) { 2118 target_klass = exact_target->holder(); 2119 } 2120 profile_call(target, recv, target_klass, collect_args_for_profiling(args, NULL, false), false); 2121 } 2122 } 2123 } 2124 2125 Invoke* result = new Invoke(code, result_type, recv, args, vtable_index, target, state_before); 2126 // push result 2127 append_split(result); 2128 2129 if (result_type != voidType) { 2130 if (method()->is_strict()) { 2131 push(result_type, round_fp(result)); 2132 } else { 2133 push(result_type, result); 2134 } 2135 } 2136 if (profile_return() && result_type->is_object_kind()) { 2137 profile_return_type(result, target); 2138 } 2139 } 2140 2141 2142 void GraphBuilder::new_instance(int klass_index) { 2143 ValueStack* state_before = copy_state_exhandling(); 2144 bool will_link; 2145 ciKlass* klass = stream()->get_klass(will_link); 2146 assert(klass->is_instance_klass(), "must be an instance klass"); 2147 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before, 2148 stream()->is_unresolved_klass() || stream()->is_unresolved_value_type()); 2149 _memory->new_instance(new_instance); 2150 apush(append_split(new_instance)); 2151 } 2152 2153 2154 void GraphBuilder::new_type_array() { 2155 ValueStack* state_before = copy_state_exhandling(); 2156 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before))); 2157 } 2158 2159 2160 void GraphBuilder::new_object_array() { 2161 bool will_link; 2162 ciKlass* klass = stream()->get_klass(will_link); 2163 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 2164 NewArray* n = new NewObjectArray(klass, ipop(), state_before); 2165 apush(append_split(n)); 2166 } 2167 2168 2169 bool GraphBuilder::direct_compare(ciKlass* k) { 2170 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) { 2171 ciInstanceKlass* ik = k->as_instance_klass(); 2172 if (ik->is_final()) { 2173 return true; 2174 } else { 2175 if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) { 2176 // test class is leaf class 2177 dependency_recorder()->assert_leaf_type(ik); 2178 return true; 2179 } 2180 } 2181 } 2182 return false; 2183 } 2184 2185 2186 void GraphBuilder::check_cast(int klass_index) { 2187 bool will_link; 2188 ciKlass* klass = stream()->get_klass(will_link); 2189 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception(); 2190 CheckCast* c = new CheckCast(klass, apop(), state_before); 2191 apush(append_split(c)); 2192 c->set_direct_compare(direct_compare(klass)); 2193 2194 if (is_profiling()) { 2195 // Note that we'd collect profile data in this method if we wanted it. 2196 compilation()->set_would_profile(true); 2197 2198 if (profile_checkcasts()) { 2199 c->set_profiled_method(method()); 2200 c->set_profiled_bci(bci()); 2201 c->set_should_profile(true); 2202 } 2203 } 2204 } 2205 2206 2207 void GraphBuilder::instance_of(int klass_index) { 2208 bool will_link; 2209 ciKlass* klass = stream()->get_klass(will_link); 2210 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 2211 InstanceOf* i = new InstanceOf(klass, apop(), state_before); 2212 ipush(append_split(i)); 2213 i->set_direct_compare(direct_compare(klass)); 2214 2215 if (is_profiling()) { 2216 // Note that we'd collect profile data in this method if we wanted it. 2217 compilation()->set_would_profile(true); 2218 2219 if (profile_checkcasts()) { 2220 i->set_profiled_method(method()); 2221 i->set_profiled_bci(bci()); 2222 i->set_should_profile(true); 2223 } 2224 } 2225 } 2226 2227 2228 void GraphBuilder::monitorenter(Value x, int bci) { 2229 // save state before locking in case of deoptimization after a NullPointerException 2230 ValueStack* state_before = copy_state_for_exception_with_bci(bci); 2231 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before), bci); 2232 kill_all(); 2233 } 2234 2235 2236 void GraphBuilder::monitorexit(Value x, int bci) { 2237 append_with_bci(new MonitorExit(x, state()->unlock()), bci); 2238 kill_all(); 2239 } 2240 2241 2242 void GraphBuilder::new_multi_array(int dimensions) { 2243 bool will_link; 2244 ciKlass* klass = stream()->get_klass(will_link); 2245 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 2246 2247 Values* dims = new Values(dimensions, dimensions, NULL); 2248 // fill in all dimensions 2249 int i = dimensions; 2250 while (i-- > 0) dims->at_put(i, ipop()); 2251 // create array 2252 NewArray* n = new NewMultiArray(klass, dims, state_before); 2253 apush(append_split(n)); 2254 } 2255 2256 2257 void GraphBuilder::throw_op(int bci) { 2258 // We require that the debug info for a Throw be the "state before" 2259 // the Throw (i.e., exception oop is still on TOS) 2260 ValueStack* state_before = copy_state_before_with_bci(bci); 2261 Throw* t = new Throw(apop(), state_before); 2262 // operand stack not needed after a throw 2263 state()->truncate_stack(0); 2264 append_with_bci(t, bci); 2265 } 2266 2267 2268 Value GraphBuilder::round_fp(Value fp_value) { 2269 // no rounding needed if SSE2 is used 2270 if (RoundFPResults && UseSSE < 2) { 2271 // Must currently insert rounding node for doubleword values that 2272 // are results of expressions (i.e., not loads from memory or 2273 // constants) 2274 if (fp_value->type()->tag() == doubleTag && 2275 fp_value->as_Constant() == NULL && 2276 fp_value->as_Local() == NULL && // method parameters need no rounding 2277 fp_value->as_RoundFP() == NULL) { 2278 return append(new RoundFP(fp_value)); 2279 } 2280 } 2281 return fp_value; 2282 } 2283 2284 2285 Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) { 2286 Canonicalizer canon(compilation(), instr, bci); 2287 Instruction* i1 = canon.canonical(); 2288 if (i1->is_linked() || !i1->can_be_linked()) { 2289 // Canonicalizer returned an instruction which was already 2290 // appended so simply return it. 2291 return i1; 2292 } 2293 2294 if (UseLocalValueNumbering) { 2295 // Lookup the instruction in the ValueMap and add it to the map if 2296 // it's not found. 2297 Instruction* i2 = vmap()->find_insert(i1); 2298 if (i2 != i1) { 2299 // found an entry in the value map, so just return it. 2300 assert(i2->is_linked(), "should already be linked"); 2301 return i2; 2302 } 2303 ValueNumberingEffects vne(vmap()); 2304 i1->visit(&vne); 2305 } 2306 2307 // i1 was not eliminated => append it 2308 assert(i1->next() == NULL, "shouldn't already be linked"); 2309 _last = _last->set_next(i1, canon.bci()); 2310 2311 if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) { 2312 // set the bailout state but complete normal processing. We 2313 // might do a little more work before noticing the bailout so we 2314 // want processing to continue normally until it's noticed. 2315 bailout("Method and/or inlining is too large"); 2316 } 2317 2318 #ifndef PRODUCT 2319 if (PrintIRDuringConstruction) { 2320 InstructionPrinter ip; 2321 ip.print_line(i1); 2322 if (Verbose) { 2323 state()->print(); 2324 } 2325 } 2326 #endif 2327 2328 // save state after modification of operand stack for StateSplit instructions 2329 StateSplit* s = i1->as_StateSplit(); 2330 if (s != NULL) { 2331 if (EliminateFieldAccess) { 2332 Intrinsic* intrinsic = s->as_Intrinsic(); 2333 if (s->as_Invoke() != NULL || (intrinsic && !intrinsic->preserves_state())) { 2334 _memory->kill(); 2335 } 2336 } 2337 s->set_state(state()->copy(ValueStack::StateAfter, canon.bci())); 2338 } 2339 2340 // set up exception handlers for this instruction if necessary 2341 if (i1->can_trap()) { 2342 i1->set_exception_handlers(handle_exception(i1)); 2343 assert(i1->exception_state() != NULL || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state"); 2344 } 2345 return i1; 2346 } 2347 2348 2349 Instruction* GraphBuilder::append(Instruction* instr) { 2350 assert(instr->as_StateSplit() == NULL || instr->as_BlockEnd() != NULL, "wrong append used"); 2351 return append_with_bci(instr, bci()); 2352 } 2353 2354 2355 Instruction* GraphBuilder::append_split(StateSplit* instr) { 2356 return append_with_bci(instr, bci()); 2357 } 2358 2359 2360 void GraphBuilder::null_check(Value value) { 2361 if (value->as_NewArray() != NULL || value->as_NewInstance() != NULL) { 2362 return; 2363 } else { 2364 Constant* con = value->as_Constant(); 2365 if (con) { 2366 ObjectType* c = con->type()->as_ObjectType(); 2367 if (c && c->is_loaded()) { 2368 ObjectConstant* oc = c->as_ObjectConstant(); 2369 if (!oc || !oc->value()->is_null_object()) { 2370 return; 2371 } 2372 } 2373 } 2374 } 2375 append(new NullCheck(value, copy_state_for_exception())); 2376 } 2377 2378 2379 2380 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) { 2381 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != NULL)) { 2382 assert(instruction->exception_state() == NULL 2383 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState 2384 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->should_retain_local_variables()), 2385 "exception_state should be of exception kind"); 2386 return new XHandlers(); 2387 } 2388 2389 XHandlers* exception_handlers = new XHandlers(); 2390 ScopeData* cur_scope_data = scope_data(); 2391 ValueStack* cur_state = instruction->state_before(); 2392 ValueStack* prev_state = NULL; 2393 int scope_count = 0; 2394 2395 assert(cur_state != NULL, "state_before must be set"); 2396 do { 2397 int cur_bci = cur_state->bci(); 2398 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match"); 2399 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci(), "invalid bci"); 2400 2401 // join with all potential exception handlers 2402 XHandlers* list = cur_scope_data->xhandlers(); 2403 const int n = list->length(); 2404 for (int i = 0; i < n; i++) { 2405 XHandler* h = list->handler_at(i); 2406 if (h->covers(cur_bci)) { 2407 // h is a potential exception handler => join it 2408 compilation()->set_has_exception_handlers(true); 2409 2410 BlockBegin* entry = h->entry_block(); 2411 if (entry == block()) { 2412 // It's acceptable for an exception handler to cover itself 2413 // but we don't handle that in the parser currently. It's 2414 // very rare so we bailout instead of trying to handle it. 2415 BAILOUT_("exception handler covers itself", exception_handlers); 2416 } 2417 assert(entry->bci() == h->handler_bci(), "must match"); 2418 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond"); 2419 2420 // previously this was a BAILOUT, but this is not necessary 2421 // now because asynchronous exceptions are not handled this way. 2422 assert(entry->state() == NULL || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match"); 2423 2424 // xhandler start with an empty expression stack 2425 if (cur_state->stack_size() != 0) { 2426 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci()); 2427 } 2428 if (instruction->exception_state() == NULL) { 2429 instruction->set_exception_state(cur_state); 2430 } 2431 2432 // Note: Usually this join must work. However, very 2433 // complicated jsr-ret structures where we don't ret from 2434 // the subroutine can cause the objects on the monitor 2435 // stacks to not match because blocks can be parsed twice. 2436 // The only test case we've seen so far which exhibits this 2437 // problem is caught by the infinite recursion test in 2438 // GraphBuilder::jsr() if the join doesn't work. 2439 if (!entry->try_merge(cur_state)) { 2440 BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers); 2441 } 2442 2443 // add current state for correct handling of phi functions at begin of xhandler 2444 int phi_operand = entry->add_exception_state(cur_state); 2445 2446 // add entry to the list of xhandlers of this block 2447 _block->add_exception_handler(entry); 2448 2449 // add back-edge from xhandler entry to this block 2450 if (!entry->is_predecessor(_block)) { 2451 entry->add_predecessor(_block); 2452 } 2453 2454 // clone XHandler because phi_operand and scope_count can not be shared 2455 XHandler* new_xhandler = new XHandler(h); 2456 new_xhandler->set_phi_operand(phi_operand); 2457 new_xhandler->set_scope_count(scope_count); 2458 exception_handlers->append(new_xhandler); 2459 2460 // fill in exception handler subgraph lazily 2461 assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet"); 2462 cur_scope_data->add_to_work_list(entry); 2463 2464 // stop when reaching catchall 2465 if (h->catch_type() == 0) { 2466 return exception_handlers; 2467 } 2468 } 2469 } 2470 2471 if (exception_handlers->length() == 0) { 2472 // This scope and all callees do not handle exceptions, so the local 2473 // variables of this scope are not needed. However, the scope itself is 2474 // required for a correct exception stack trace -> clear out the locals. 2475 if (_compilation->env()->should_retain_local_variables()) { 2476 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci()); 2477 } else { 2478 cur_state = cur_state->copy(ValueStack::EmptyExceptionState, cur_state->bci()); 2479 } 2480 if (prev_state != NULL) { 2481 prev_state->set_caller_state(cur_state); 2482 } 2483 if (instruction->exception_state() == NULL) { 2484 instruction->set_exception_state(cur_state); 2485 } 2486 } 2487 2488 // Set up iteration for next time. 2489 // If parsing a jsr, do not grab exception handlers from the 2490 // parent scopes for this method (already got them, and they 2491 // needed to be cloned) 2492 2493 while (cur_scope_data->parsing_jsr()) { 2494 cur_scope_data = cur_scope_data->parent(); 2495 } 2496 2497 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match"); 2498 assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler"); 2499 2500 prev_state = cur_state; 2501 cur_state = cur_state->caller_state(); 2502 cur_scope_data = cur_scope_data->parent(); 2503 scope_count++; 2504 } while (cur_scope_data != NULL); 2505 2506 return exception_handlers; 2507 } 2508 2509 2510 // Helper class for simplifying Phis. 2511 class PhiSimplifier : public BlockClosure { 2512 private: 2513 bool _has_substitutions; 2514 Value simplify(Value v); 2515 2516 public: 2517 PhiSimplifier(BlockBegin* start) : _has_substitutions(false) { 2518 start->iterate_preorder(this); 2519 if (_has_substitutions) { 2520 SubstitutionResolver sr(start); 2521 } 2522 } 2523 void block_do(BlockBegin* b); 2524 bool has_substitutions() const { return _has_substitutions; } 2525 }; 2526 2527 2528 Value PhiSimplifier::simplify(Value v) { 2529 Phi* phi = v->as_Phi(); 2530 2531 if (phi == NULL) { 2532 // no phi function 2533 return v; 2534 } else if (v->has_subst()) { 2535 // already substituted; subst can be phi itself -> simplify 2536 return simplify(v->subst()); 2537 } else if (phi->is_set(Phi::cannot_simplify)) { 2538 // already tried to simplify phi before 2539 return phi; 2540 } else if (phi->is_set(Phi::visited)) { 2541 // break cycles in phi functions 2542 return phi; 2543 } else if (phi->type()->is_illegal()) { 2544 // illegal phi functions are ignored anyway 2545 return phi; 2546 2547 } else { 2548 // mark phi function as processed to break cycles in phi functions 2549 phi->set(Phi::visited); 2550 2551 // simplify x = [y, x] and x = [y, y] to y 2552 Value subst = NULL; 2553 int opd_count = phi->operand_count(); 2554 for (int i = 0; i < opd_count; i++) { 2555 Value opd = phi->operand_at(i); 2556 assert(opd != NULL, "Operand must exist!"); 2557 2558 if (opd->type()->is_illegal()) { 2559 // if one operand is illegal, the entire phi function is illegal 2560 phi->make_illegal(); 2561 phi->clear(Phi::visited); 2562 return phi; 2563 } 2564 2565 Value new_opd = simplify(opd); 2566 assert(new_opd != NULL, "Simplified operand must exist!"); 2567 2568 if (new_opd != phi && new_opd != subst) { 2569 if (subst == NULL) { 2570 subst = new_opd; 2571 } else { 2572 // no simplification possible 2573 phi->set(Phi::cannot_simplify); 2574 phi->clear(Phi::visited); 2575 return phi; 2576 } 2577 } 2578 } 2579 2580 // sucessfully simplified phi function 2581 assert(subst != NULL, "illegal phi function"); 2582 _has_substitutions = true; 2583 phi->clear(Phi::visited); 2584 phi->set_subst(subst); 2585 2586 #ifndef PRODUCT 2587 if (PrintPhiFunctions) { 2588 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()); 2589 } 2590 #endif 2591 2592 return subst; 2593 } 2594 } 2595 2596 2597 void PhiSimplifier::block_do(BlockBegin* b) { 2598 for_each_phi_fun(b, phi, 2599 simplify(phi); 2600 ); 2601 2602 #ifdef ASSERT 2603 for_each_phi_fun(b, phi, 2604 assert(phi->operand_count() != 1 || phi->subst() != phi, "missed trivial simplification"); 2605 ); 2606 2607 ValueStack* state = b->state()->caller_state(); 2608 for_each_state_value(state, value, 2609 Phi* phi = value->as_Phi(); 2610 assert(phi == NULL || phi->block() != b, "must not have phi function to simplify in caller state"); 2611 ); 2612 #endif 2613 } 2614 2615 // This method is called after all blocks are filled with HIR instructions 2616 // It eliminates all Phi functions of the form x = [y, y] and x = [y, x] 2617 void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) { 2618 PhiSimplifier simplifier(start); 2619 } 2620 2621 2622 void GraphBuilder::connect_to_end(BlockBegin* beg) { 2623 // setup iteration 2624 kill_all(); 2625 _block = beg; 2626 _state = beg->state()->copy_for_parsing(); 2627 _last = beg; 2628 iterate_bytecodes_for_block(beg->bci()); 2629 } 2630 2631 2632 BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) { 2633 #ifndef PRODUCT 2634 if (PrintIRDuringConstruction) { 2635 tty->cr(); 2636 InstructionPrinter ip; 2637 ip.print_instr(_block); tty->cr(); 2638 ip.print_stack(_block->state()); tty->cr(); 2639 ip.print_inline_level(_block); 2640 ip.print_head(); 2641 tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size()); 2642 } 2643 #endif 2644 _skip_block = false; 2645 assert(state() != NULL, "ValueStack missing!"); 2646 CompileLog* log = compilation()->log(); 2647 ciBytecodeStream s(method()); 2648 s.reset_to_bci(bci); 2649 int prev_bci = bci; 2650 scope_data()->set_stream(&s); 2651 // iterate 2652 Bytecodes::Code code = Bytecodes::_illegal; 2653 bool push_exception = false; 2654 2655 if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == NULL) { 2656 // first thing in the exception entry block should be the exception object. 2657 push_exception = true; 2658 } 2659 2660 bool ignore_return = scope_data()->ignore_return(); 2661 2662 while (!bailed_out() && last()->as_BlockEnd() == NULL && 2663 (code = stream()->next()) != ciBytecodeStream::EOBC() && 2664 (block_at(s.cur_bci()) == NULL || block_at(s.cur_bci()) == block())) { 2665 assert(state()->kind() == ValueStack::Parsing, "invalid state kind"); 2666 2667 if (log != NULL) 2668 log->set_context("bc code='%d' bci='%d'", (int)code, s.cur_bci()); 2669 2670 // Check for active jsr during OSR compilation 2671 if (compilation()->is_osr_compile() 2672 && scope()->is_top_scope() 2673 && parsing_jsr() 2674 && s.cur_bci() == compilation()->osr_bci()) { 2675 bailout("OSR not supported while a jsr is active"); 2676 } 2677 2678 if (push_exception) { 2679 apush(append(new ExceptionObject())); 2680 push_exception = false; 2681 } 2682 2683 // handle bytecode 2684 switch (code) { 2685 case Bytecodes::_nop : /* nothing to do */ break; 2686 case Bytecodes::_aconst_null : apush(append(new Constant(objectNull ))); break; 2687 case Bytecodes::_iconst_m1 : ipush(append(new Constant(new IntConstant (-1)))); break; 2688 case Bytecodes::_iconst_0 : ipush(append(new Constant(intZero ))); break; 2689 case Bytecodes::_iconst_1 : ipush(append(new Constant(intOne ))); break; 2690 case Bytecodes::_iconst_2 : ipush(append(new Constant(new IntConstant ( 2)))); break; 2691 case Bytecodes::_iconst_3 : ipush(append(new Constant(new IntConstant ( 3)))); break; 2692 case Bytecodes::_iconst_4 : ipush(append(new Constant(new IntConstant ( 4)))); break; 2693 case Bytecodes::_iconst_5 : ipush(append(new Constant(new IntConstant ( 5)))); break; 2694 case Bytecodes::_lconst_0 : lpush(append(new Constant(new LongConstant ( 0)))); break; 2695 case Bytecodes::_lconst_1 : lpush(append(new Constant(new LongConstant ( 1)))); break; 2696 case Bytecodes::_fconst_0 : fpush(append(new Constant(new FloatConstant ( 0)))); break; 2697 case Bytecodes::_fconst_1 : fpush(append(new Constant(new FloatConstant ( 1)))); break; 2698 case Bytecodes::_fconst_2 : fpush(append(new Constant(new FloatConstant ( 2)))); break; 2699 case Bytecodes::_dconst_0 : dpush(append(new Constant(new DoubleConstant( 0)))); break; 2700 case Bytecodes::_dconst_1 : dpush(append(new Constant(new DoubleConstant( 1)))); break; 2701 case Bytecodes::_bipush : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break; 2702 case Bytecodes::_sipush : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break; 2703 case Bytecodes::_ldc : // fall through 2704 case Bytecodes::_ldc_w : // fall through 2705 case Bytecodes::_ldc2_w : load_constant(); break; 2706 case Bytecodes::_iload : load_local(intType , s.get_index()); break; 2707 case Bytecodes::_lload : load_local(longType , s.get_index()); break; 2708 case Bytecodes::_fload : load_local(floatType , s.get_index()); break; 2709 case Bytecodes::_dload : load_local(doubleType , s.get_index()); break; 2710 case Bytecodes::_aload : load_local(instanceType, s.get_index()); break; 2711 case Bytecodes::_iload_0 : load_local(intType , 0); break; 2712 case Bytecodes::_iload_1 : load_local(intType , 1); break; 2713 case Bytecodes::_iload_2 : load_local(intType , 2); break; 2714 case Bytecodes::_iload_3 : load_local(intType , 3); break; 2715 case Bytecodes::_lload_0 : load_local(longType , 0); break; 2716 case Bytecodes::_lload_1 : load_local(longType , 1); break; 2717 case Bytecodes::_lload_2 : load_local(longType , 2); break; 2718 case Bytecodes::_lload_3 : load_local(longType , 3); break; 2719 case Bytecodes::_fload_0 : load_local(floatType , 0); break; 2720 case Bytecodes::_fload_1 : load_local(floatType , 1); break; 2721 case Bytecodes::_fload_2 : load_local(floatType , 2); break; 2722 case Bytecodes::_fload_3 : load_local(floatType , 3); break; 2723 case Bytecodes::_dload_0 : load_local(doubleType, 0); break; 2724 case Bytecodes::_dload_1 : load_local(doubleType, 1); break; 2725 case Bytecodes::_dload_2 : load_local(doubleType, 2); break; 2726 case Bytecodes::_dload_3 : load_local(doubleType, 3); break; 2727 case Bytecodes::_aload_0 : load_local(objectType, 0); break; 2728 case Bytecodes::_aload_1 : load_local(objectType, 1); break; 2729 case Bytecodes::_aload_2 : load_local(objectType, 2); break; 2730 case Bytecodes::_aload_3 : load_local(objectType, 3); break; 2731 case Bytecodes::_iaload : load_indexed(T_INT ); break; 2732 case Bytecodes::_laload : load_indexed(T_LONG ); break; 2733 case Bytecodes::_faload : load_indexed(T_FLOAT ); break; 2734 case Bytecodes::_daload : load_indexed(T_DOUBLE); break; 2735 case Bytecodes::_aaload : load_indexed(T_OBJECT); break; 2736 case Bytecodes::_baload : load_indexed(T_BYTE ); break; 2737 case Bytecodes::_caload : load_indexed(T_CHAR ); break; 2738 case Bytecodes::_saload : load_indexed(T_SHORT ); break; 2739 case Bytecodes::_istore : store_local(intType , s.get_index()); break; 2740 case Bytecodes::_lstore : store_local(longType , s.get_index()); break; 2741 case Bytecodes::_fstore : store_local(floatType , s.get_index()); break; 2742 case Bytecodes::_dstore : store_local(doubleType, s.get_index()); break; 2743 case Bytecodes::_astore : store_local(objectType, s.get_index()); break; 2744 case Bytecodes::_istore_0 : store_local(intType , 0); break; 2745 case Bytecodes::_istore_1 : store_local(intType , 1); break; 2746 case Bytecodes::_istore_2 : store_local(intType , 2); break; 2747 case Bytecodes::_istore_3 : store_local(intType , 3); break; 2748 case Bytecodes::_lstore_0 : store_local(longType , 0); break; 2749 case Bytecodes::_lstore_1 : store_local(longType , 1); break; 2750 case Bytecodes::_lstore_2 : store_local(longType , 2); break; 2751 case Bytecodes::_lstore_3 : store_local(longType , 3); break; 2752 case Bytecodes::_fstore_0 : store_local(floatType , 0); break; 2753 case Bytecodes::_fstore_1 : store_local(floatType , 1); break; 2754 case Bytecodes::_fstore_2 : store_local(floatType , 2); break; 2755 case Bytecodes::_fstore_3 : store_local(floatType , 3); break; 2756 case Bytecodes::_dstore_0 : store_local(doubleType, 0); break; 2757 case Bytecodes::_dstore_1 : store_local(doubleType, 1); break; 2758 case Bytecodes::_dstore_2 : store_local(doubleType, 2); break; 2759 case Bytecodes::_dstore_3 : store_local(doubleType, 3); break; 2760 case Bytecodes::_astore_0 : store_local(objectType, 0); break; 2761 case Bytecodes::_astore_1 : store_local(objectType, 1); break; 2762 case Bytecodes::_astore_2 : store_local(objectType, 2); break; 2763 case Bytecodes::_astore_3 : store_local(objectType, 3); break; 2764 case Bytecodes::_iastore : store_indexed(T_INT ); break; 2765 case Bytecodes::_lastore : store_indexed(T_LONG ); break; 2766 case Bytecodes::_fastore : store_indexed(T_FLOAT ); break; 2767 case Bytecodes::_dastore : store_indexed(T_DOUBLE); break; 2768 case Bytecodes::_aastore : store_indexed(T_OBJECT); break; 2769 case Bytecodes::_bastore : store_indexed(T_BYTE ); break; 2770 case Bytecodes::_castore : store_indexed(T_CHAR ); break; 2771 case Bytecodes::_sastore : store_indexed(T_SHORT ); break; 2772 case Bytecodes::_pop : // fall through 2773 case Bytecodes::_pop2 : // fall through 2774 case Bytecodes::_dup : // fall through 2775 case Bytecodes::_dup_x1 : // fall through 2776 case Bytecodes::_dup_x2 : // fall through 2777 case Bytecodes::_dup2 : // fall through 2778 case Bytecodes::_dup2_x1 : // fall through 2779 case Bytecodes::_dup2_x2 : // fall through 2780 case Bytecodes::_swap : stack_op(code); break; 2781 case Bytecodes::_iadd : arithmetic_op(intType , code); break; 2782 case Bytecodes::_ladd : arithmetic_op(longType , code); break; 2783 case Bytecodes::_fadd : arithmetic_op(floatType , code); break; 2784 case Bytecodes::_dadd : arithmetic_op(doubleType, code); break; 2785 case Bytecodes::_isub : arithmetic_op(intType , code); break; 2786 case Bytecodes::_lsub : arithmetic_op(longType , code); break; 2787 case Bytecodes::_fsub : arithmetic_op(floatType , code); break; 2788 case Bytecodes::_dsub : arithmetic_op(doubleType, code); break; 2789 case Bytecodes::_imul : arithmetic_op(intType , code); break; 2790 case Bytecodes::_lmul : arithmetic_op(longType , code); break; 2791 case Bytecodes::_fmul : arithmetic_op(floatType , code); break; 2792 case Bytecodes::_dmul : arithmetic_op(doubleType, code); break; 2793 case Bytecodes::_idiv : arithmetic_op(intType , code, copy_state_for_exception()); break; 2794 case Bytecodes::_ldiv : arithmetic_op(longType , code, copy_state_for_exception()); break; 2795 case Bytecodes::_fdiv : arithmetic_op(floatType , code); break; 2796 case Bytecodes::_ddiv : arithmetic_op(doubleType, code); break; 2797 case Bytecodes::_irem : arithmetic_op(intType , code, copy_state_for_exception()); break; 2798 case Bytecodes::_lrem : arithmetic_op(longType , code, copy_state_for_exception()); break; 2799 case Bytecodes::_frem : arithmetic_op(floatType , code); break; 2800 case Bytecodes::_drem : arithmetic_op(doubleType, code); break; 2801 case Bytecodes::_ineg : negate_op(intType ); break; 2802 case Bytecodes::_lneg : negate_op(longType ); break; 2803 case Bytecodes::_fneg : negate_op(floatType ); break; 2804 case Bytecodes::_dneg : negate_op(doubleType); break; 2805 case Bytecodes::_ishl : shift_op(intType , code); break; 2806 case Bytecodes::_lshl : shift_op(longType, code); break; 2807 case Bytecodes::_ishr : shift_op(intType , code); break; 2808 case Bytecodes::_lshr : shift_op(longType, code); break; 2809 case Bytecodes::_iushr : shift_op(intType , code); break; 2810 case Bytecodes::_lushr : shift_op(longType, code); break; 2811 case Bytecodes::_iand : logic_op(intType , code); break; 2812 case Bytecodes::_land : logic_op(longType, code); break; 2813 case Bytecodes::_ior : logic_op(intType , code); break; 2814 case Bytecodes::_lor : logic_op(longType, code); break; 2815 case Bytecodes::_ixor : logic_op(intType , code); break; 2816 case Bytecodes::_lxor : logic_op(longType, code); break; 2817 case Bytecodes::_iinc : increment(); break; 2818 case Bytecodes::_i2l : convert(code, T_INT , T_LONG ); break; 2819 case Bytecodes::_i2f : convert(code, T_INT , T_FLOAT ); break; 2820 case Bytecodes::_i2d : convert(code, T_INT , T_DOUBLE); break; 2821 case Bytecodes::_l2i : convert(code, T_LONG , T_INT ); break; 2822 case Bytecodes::_l2f : convert(code, T_LONG , T_FLOAT ); break; 2823 case Bytecodes::_l2d : convert(code, T_LONG , T_DOUBLE); break; 2824 case Bytecodes::_f2i : convert(code, T_FLOAT , T_INT ); break; 2825 case Bytecodes::_f2l : convert(code, T_FLOAT , T_LONG ); break; 2826 case Bytecodes::_f2d : convert(code, T_FLOAT , T_DOUBLE); break; 2827 case Bytecodes::_d2i : convert(code, T_DOUBLE, T_INT ); break; 2828 case Bytecodes::_d2l : convert(code, T_DOUBLE, T_LONG ); break; 2829 case Bytecodes::_d2f : convert(code, T_DOUBLE, T_FLOAT ); break; 2830 case Bytecodes::_i2b : convert(code, T_INT , T_BYTE ); break; 2831 case Bytecodes::_i2c : convert(code, T_INT , T_CHAR ); break; 2832 case Bytecodes::_i2s : convert(code, T_INT , T_SHORT ); break; 2833 case Bytecodes::_lcmp : compare_op(longType , code); break; 2834 case Bytecodes::_fcmpl : compare_op(floatType , code); break; 2835 case Bytecodes::_fcmpg : compare_op(floatType , code); break; 2836 case Bytecodes::_dcmpl : compare_op(doubleType, code); break; 2837 case Bytecodes::_dcmpg : compare_op(doubleType, code); break; 2838 case Bytecodes::_ifeq : if_zero(intType , If::eql); break; 2839 case Bytecodes::_ifne : if_zero(intType , If::neq); break; 2840 case Bytecodes::_iflt : if_zero(intType , If::lss); break; 2841 case Bytecodes::_ifge : if_zero(intType , If::geq); break; 2842 case Bytecodes::_ifgt : if_zero(intType , If::gtr); break; 2843 case Bytecodes::_ifle : if_zero(intType , If::leq); break; 2844 case Bytecodes::_if_icmpeq : if_same(intType , If::eql); break; 2845 case Bytecodes::_if_icmpne : if_same(intType , If::neq); break; 2846 case Bytecodes::_if_icmplt : if_same(intType , If::lss); break; 2847 case Bytecodes::_if_icmpge : if_same(intType , If::geq); break; 2848 case Bytecodes::_if_icmpgt : if_same(intType , If::gtr); break; 2849 case Bytecodes::_if_icmple : if_same(intType , If::leq); break; 2850 case Bytecodes::_if_acmpeq : if_same(objectType, If::eql); break; 2851 case Bytecodes::_if_acmpne : if_same(objectType, If::neq); break; 2852 case Bytecodes::_goto : _goto(s.cur_bci(), s.get_dest()); break; 2853 case Bytecodes::_jsr : jsr(s.get_dest()); break; 2854 case Bytecodes::_ret : ret(s.get_index()); break; 2855 case Bytecodes::_tableswitch : table_switch(); break; 2856 case Bytecodes::_lookupswitch : lookup_switch(); break; 2857 case Bytecodes::_ireturn : method_return(ipop(), ignore_return); break; 2858 case Bytecodes::_lreturn : method_return(lpop(), ignore_return); break; 2859 case Bytecodes::_freturn : method_return(fpop(), ignore_return); break; 2860 case Bytecodes::_dreturn : method_return(dpop(), ignore_return); break; 2861 case Bytecodes::_areturn : method_return(apop(), ignore_return); break; 2862 case Bytecodes::_return : method_return(NULL , ignore_return); break; 2863 case Bytecodes::_getstatic : // fall through 2864 case Bytecodes::_putstatic : // fall through 2865 case Bytecodes::_getfield : // fall through 2866 case Bytecodes::_putfield : access_field(code); break; 2867 case Bytecodes::_invokevirtual : // fall through 2868 case Bytecodes::_invokespecial : // fall through 2869 case Bytecodes::_invokestatic : // fall through 2870 case Bytecodes::_invokedynamic : // fall through 2871 case Bytecodes::_invokeinterface: invoke(code); break; 2872 case Bytecodes::_new : new_instance(s.get_index_u2()); break; 2873 case Bytecodes::_newarray : new_type_array(); break; 2874 case Bytecodes::_anewarray : new_object_array(); break; 2875 case Bytecodes::_arraylength : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; } 2876 case Bytecodes::_athrow : throw_op(s.cur_bci()); break; 2877 case Bytecodes::_checkcast : check_cast(s.get_index_u2()); break; 2878 case Bytecodes::_instanceof : instance_of(s.get_index_u2()); break; 2879 case Bytecodes::_monitorenter : monitorenter(apop(), s.cur_bci()); break; 2880 case Bytecodes::_monitorexit : monitorexit (apop(), s.cur_bci()); break; 2881 case Bytecodes::_wide : ShouldNotReachHere(); break; 2882 case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break; 2883 case Bytecodes::_ifnull : if_null(objectType, If::eql); break; 2884 case Bytecodes::_ifnonnull : if_null(objectType, If::neq); break; 2885 case Bytecodes::_goto_w : _goto(s.cur_bci(), s.get_far_dest()); break; 2886 case Bytecodes::_jsr_w : jsr(s.get_far_dest()); break; 2887 case Bytecodes::_breakpoint : BAILOUT_("concurrent setting of breakpoint", NULL); 2888 default : ShouldNotReachHere(); break; 2889 } 2890 2891 if (log != NULL) 2892 log->clear_context(); // skip marker if nothing was printed 2893 2894 // save current bci to setup Goto at the end 2895 prev_bci = s.cur_bci(); 2896 2897 } 2898 CHECK_BAILOUT_(NULL); 2899 // stop processing of this block (see try_inline_full) 2900 if (_skip_block) { 2901 _skip_block = false; 2902 assert(_last && _last->as_BlockEnd(), ""); 2903 return _last->as_BlockEnd(); 2904 } 2905 // if there are any, check if last instruction is a BlockEnd instruction 2906 BlockEnd* end = last()->as_BlockEnd(); 2907 if (end == NULL) { 2908 // all blocks must end with a BlockEnd instruction => add a Goto 2909 end = new Goto(block_at(s.cur_bci()), false); 2910 append(end); 2911 } 2912 assert(end == last()->as_BlockEnd(), "inconsistency"); 2913 2914 assert(end->state() != NULL, "state must already be present"); 2915 assert(end->as_Return() == NULL || end->as_Throw() == NULL || end->state()->stack_size() == 0, "stack not needed for return and throw"); 2916 2917 // connect to begin & set state 2918 // NOTE that inlining may have changed the block we are parsing 2919 block()->set_end(end); 2920 // propagate state 2921 for (int i = end->number_of_sux() - 1; i >= 0; i--) { 2922 BlockBegin* sux = end->sux_at(i); 2923 assert(sux->is_predecessor(block()), "predecessor missing"); 2924 // be careful, bailout if bytecodes are strange 2925 if (!sux->try_merge(end->state())) BAILOUT_("block join failed", NULL); 2926 scope_data()->add_to_work_list(end->sux_at(i)); 2927 } 2928 2929 scope_data()->set_stream(NULL); 2930 2931 // done 2932 return end; 2933 } 2934 2935 2936 void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) { 2937 do { 2938 if (start_in_current_block_for_inlining && !bailed_out()) { 2939 iterate_bytecodes_for_block(0); 2940 start_in_current_block_for_inlining = false; 2941 } else { 2942 BlockBegin* b; 2943 while ((b = scope_data()->remove_from_work_list()) != NULL) { 2944 if (!b->is_set(BlockBegin::was_visited_flag)) { 2945 if (b->is_set(BlockBegin::osr_entry_flag)) { 2946 // we're about to parse the osr entry block, so make sure 2947 // we setup the OSR edge leading into this block so that 2948 // Phis get setup correctly. 2949 setup_osr_entry_block(); 2950 // this is no longer the osr entry block, so clear it. 2951 b->clear(BlockBegin::osr_entry_flag); 2952 } 2953 b->set(BlockBegin::was_visited_flag); 2954 connect_to_end(b); 2955 } 2956 } 2957 } 2958 } while (!bailed_out() && !scope_data()->is_work_list_empty()); 2959 } 2960 2961 2962 bool GraphBuilder::_can_trap [Bytecodes::number_of_java_codes]; 2963 2964 void GraphBuilder::initialize() { 2965 // the following bytecodes are assumed to potentially 2966 // throw exceptions in compiled code - note that e.g. 2967 // monitorexit & the return bytecodes do not throw 2968 // exceptions since monitor pairing proved that they 2969 // succeed (if monitor pairing succeeded) 2970 Bytecodes::Code can_trap_list[] = 2971 { Bytecodes::_ldc 2972 , Bytecodes::_ldc_w 2973 , Bytecodes::_ldc2_w 2974 , Bytecodes::_iaload 2975 , Bytecodes::_laload 2976 , Bytecodes::_faload 2977 , Bytecodes::_daload 2978 , Bytecodes::_aaload 2979 , Bytecodes::_baload 2980 , Bytecodes::_caload 2981 , Bytecodes::_saload 2982 , Bytecodes::_iastore 2983 , Bytecodes::_lastore 2984 , Bytecodes::_fastore 2985 , Bytecodes::_dastore 2986 , Bytecodes::_aastore 2987 , Bytecodes::_bastore 2988 , Bytecodes::_castore 2989 , Bytecodes::_sastore 2990 , Bytecodes::_idiv 2991 , Bytecodes::_ldiv 2992 , Bytecodes::_irem 2993 , Bytecodes::_lrem 2994 , Bytecodes::_getstatic 2995 , Bytecodes::_putstatic 2996 , Bytecodes::_getfield 2997 , Bytecodes::_putfield 2998 , Bytecodes::_invokevirtual 2999 , Bytecodes::_invokespecial 3000 , Bytecodes::_invokestatic 3001 , Bytecodes::_invokedynamic 3002 , Bytecodes::_invokeinterface 3003 , Bytecodes::_new 3004 , Bytecodes::_newarray 3005 , Bytecodes::_anewarray 3006 , Bytecodes::_arraylength 3007 , Bytecodes::_athrow 3008 , Bytecodes::_checkcast 3009 , Bytecodes::_instanceof 3010 , Bytecodes::_monitorenter 3011 , Bytecodes::_multianewarray 3012 }; 3013 3014 // inititialize trap tables 3015 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { 3016 _can_trap[i] = false; 3017 } 3018 // set standard trap info 3019 for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) { 3020 _can_trap[can_trap_list[j]] = true; 3021 } 3022 } 3023 3024 3025 BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) { 3026 assert(entry->is_set(f), "entry/flag mismatch"); 3027 // create header block 3028 BlockBegin* h = new BlockBegin(entry->bci()); 3029 h->set_depth_first_number(0); 3030 3031 Value l = h; 3032 BlockEnd* g = new Goto(entry, false); 3033 l->set_next(g, entry->bci()); 3034 h->set_end(g); 3035 h->set(f); 3036 // setup header block end state 3037 ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis) 3038 assert(s->stack_is_empty(), "must have empty stack at entry point"); 3039 g->set_state(s); 3040 return h; 3041 } 3042 3043 3044 3045 BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) { 3046 BlockBegin* start = new BlockBegin(0); 3047 3048 // This code eliminates the empty start block at the beginning of 3049 // each method. Previously, each method started with the 3050 // start-block created below, and this block was followed by the 3051 // header block that was always empty. This header block is only 3052 // necesary if std_entry is also a backward branch target because 3053 // then phi functions may be necessary in the header block. It's 3054 // also necessary when profiling so that there's a single block that 3055 // can increment the interpreter_invocation_count. 3056 BlockBegin* new_header_block; 3057 if (std_entry->number_of_preds() > 0 || count_invocations() || count_backedges()) { 3058 new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state); 3059 } else { 3060 new_header_block = std_entry; 3061 } 3062 3063 // setup start block (root for the IR graph) 3064 Base* base = 3065 new Base( 3066 new_header_block, 3067 osr_entry 3068 ); 3069 start->set_next(base, 0); 3070 start->set_end(base); 3071 // create & setup state for start block 3072 start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci())); 3073 base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci())); 3074 3075 if (base->std_entry()->state() == NULL) { 3076 // setup states for header blocks 3077 base->std_entry()->merge(state); 3078 } 3079 3080 assert(base->std_entry()->state() != NULL, ""); 3081 return start; 3082 } 3083 3084 3085 void GraphBuilder::setup_osr_entry_block() { 3086 assert(compilation()->is_osr_compile(), "only for osrs"); 3087 3088 int osr_bci = compilation()->osr_bci(); 3089 ciBytecodeStream s(method()); 3090 s.reset_to_bci(osr_bci); 3091 s.next(); 3092 scope_data()->set_stream(&s); 3093 3094 // create a new block to be the osr setup code 3095 _osr_entry = new BlockBegin(osr_bci); 3096 _osr_entry->set(BlockBegin::osr_entry_flag); 3097 _osr_entry->set_depth_first_number(0); 3098 BlockBegin* target = bci2block()->at(osr_bci); 3099 assert(target != NULL && target->is_set(BlockBegin::osr_entry_flag), "must be there"); 3100 // the osr entry has no values for locals 3101 ValueStack* state = target->state()->copy(); 3102 _osr_entry->set_state(state); 3103 3104 kill_all(); 3105 _block = _osr_entry; 3106 _state = _osr_entry->state()->copy(); 3107 assert(_state->bci() == osr_bci, "mismatch"); 3108 _last = _osr_entry; 3109 Value e = append(new OsrEntry()); 3110 e->set_needs_null_check(false); 3111 3112 // OSR buffer is 3113 // 3114 // locals[nlocals-1..0] 3115 // monitors[number_of_locks-1..0] 3116 // 3117 // locals is a direct copy of the interpreter frame so in the osr buffer 3118 // so first slot in the local array is the last local from the interpreter 3119 // and last slot is local[0] (receiver) from the interpreter 3120 // 3121 // Similarly with locks. The first lock slot in the osr buffer is the nth lock 3122 // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock 3123 // in the interpreter frame (the method lock if a sync method) 3124 3125 // Initialize monitors in the compiled activation. 3126 3127 int index; 3128 Value local; 3129 3130 // find all the locals that the interpreter thinks contain live oops 3131 const ResourceBitMap live_oops = method()->live_local_oops_at_bci(osr_bci); 3132 3133 // compute the offset into the locals so that we can treat the buffer 3134 // as if the locals were still in the interpreter frame 3135 int locals_offset = BytesPerWord * (method()->max_locals() - 1); 3136 for_each_local_value(state, index, local) { 3137 int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord; 3138 Value get; 3139 if (local->type()->is_object_kind() && !live_oops.at(index)) { 3140 // The interpreter thinks this local is dead but the compiler 3141 // doesn't so pretend that the interpreter passed in null. 3142 get = append(new Constant(objectNull)); 3143 } else { 3144 get = append(new UnsafeGetRaw(as_BasicType(local->type()), e, 3145 append(new Constant(new IntConstant(offset))), 3146 0, 3147 true /*unaligned*/, true /*wide*/)); 3148 } 3149 _state->store_local(index, get); 3150 } 3151 3152 // the storage for the OSR buffer is freed manually in the LIRGenerator. 3153 3154 assert(state->caller_state() == NULL, "should be top scope"); 3155 state->clear_locals(); 3156 Goto* g = new Goto(target, false); 3157 append(g); 3158 _osr_entry->set_end(g); 3159 target->merge(_osr_entry->end()->state()); 3160 3161 scope_data()->set_stream(NULL); 3162 } 3163 3164 3165 ValueStack* GraphBuilder::state_at_entry() { 3166 ValueStack* state = new ValueStack(scope(), NULL); 3167 3168 // Set up locals for receiver 3169 int idx = 0; 3170 if (!method()->is_static()) { 3171 // we should always see the receiver 3172 state->store_local(idx, new Local(method()->holder(), objectType, idx, true)); 3173 idx = 1; 3174 } 3175 3176 // Set up locals for incoming arguments 3177 ciSignature* sig = method()->signature(); 3178 for (int i = 0; i < sig->count(); i++) { 3179 ciType* type = sig->type_at(i); 3180 BasicType basic_type = type->basic_type(); 3181 // don't allow T_ARRAY to propagate into locals types 3182 if (basic_type == T_ARRAY) basic_type = T_OBJECT; 3183 ValueType* vt = as_ValueType(basic_type); 3184 state->store_local(idx, new Local(type, vt, idx, false)); 3185 idx += type->size(); 3186 } 3187 3188 // lock synchronized method 3189 if (method()->is_synchronized()) { 3190 state->lock(NULL); 3191 } 3192 3193 return state; 3194 } 3195 3196 3197 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope) 3198 : _scope_data(NULL) 3199 , _instruction_count(0) 3200 , _osr_entry(NULL) 3201 , _memory(new MemoryBuffer()) 3202 , _compilation(compilation) 3203 , _inline_bailout_msg(NULL) 3204 { 3205 int osr_bci = compilation->osr_bci(); 3206 3207 // determine entry points and bci2block mapping 3208 BlockListBuilder blm(compilation, scope, osr_bci); 3209 CHECK_BAILOUT(); 3210 3211 BlockList* bci2block = blm.bci2block(); 3212 BlockBegin* start_block = bci2block->at(0); 3213 3214 push_root_scope(scope, bci2block, start_block); 3215 3216 // setup state for std entry 3217 _initial_state = state_at_entry(); 3218 start_block->merge(_initial_state); 3219 3220 // complete graph 3221 _vmap = new ValueMap(); 3222 switch (scope->method()->intrinsic_id()) { 3223 case vmIntrinsics::_dabs : // fall through 3224 case vmIntrinsics::_dsqrt : // fall through 3225 case vmIntrinsics::_dsin : // fall through 3226 case vmIntrinsics::_dcos : // fall through 3227 case vmIntrinsics::_dtan : // fall through 3228 case vmIntrinsics::_dlog : // fall through 3229 case vmIntrinsics::_dlog10 : // fall through 3230 case vmIntrinsics::_dexp : // fall through 3231 case vmIntrinsics::_dpow : // fall through 3232 { 3233 // Compiles where the root method is an intrinsic need a special 3234 // compilation environment because the bytecodes for the method 3235 // shouldn't be parsed during the compilation, only the special 3236 // Intrinsic node should be emitted. If this isn't done the the 3237 // code for the inlined version will be different than the root 3238 // compiled version which could lead to monotonicity problems on 3239 // intel. 3240 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) { 3241 BAILOUT("failed to inline intrinsic, method not annotated"); 3242 } 3243 3244 // Set up a stream so that appending instructions works properly. 3245 ciBytecodeStream s(scope->method()); 3246 s.reset_to_bci(0); 3247 scope_data()->set_stream(&s); 3248 s.next(); 3249 3250 // setup the initial block state 3251 _block = start_block; 3252 _state = start_block->state()->copy_for_parsing(); 3253 _last = start_block; 3254 load_local(doubleType, 0); 3255 if (scope->method()->intrinsic_id() == vmIntrinsics::_dpow) { 3256 load_local(doubleType, 2); 3257 } 3258 3259 // Emit the intrinsic node. 3260 bool result = try_inline_intrinsics(scope->method()); 3261 if (!result) BAILOUT("failed to inline intrinsic"); 3262 method_return(dpop()); 3263 3264 // connect the begin and end blocks and we're all done. 3265 BlockEnd* end = last()->as_BlockEnd(); 3266 block()->set_end(end); 3267 break; 3268 } 3269 3270 case vmIntrinsics::_Reference_get: 3271 { 3272 { 3273 // With java.lang.ref.reference.get() we must go through the 3274 // intrinsic - when G1 is enabled - even when get() is the root 3275 // method of the compile so that, if necessary, the value in 3276 // the referent field of the reference object gets recorded by 3277 // the pre-barrier code. 3278 // Specifically, if G1 is enabled, the value in the referent 3279 // field is recorded by the G1 SATB pre barrier. This will 3280 // result in the referent being marked live and the reference 3281 // object removed from the list of discovered references during 3282 // reference processing. 3283 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) { 3284 BAILOUT("failed to inline intrinsic, method not annotated"); 3285 } 3286 3287 // Also we need intrinsic to prevent commoning reads from this field 3288 // across safepoint since GC can change its value. 3289 3290 // Set up a stream so that appending instructions works properly. 3291 ciBytecodeStream s(scope->method()); 3292 s.reset_to_bci(0); 3293 scope_data()->set_stream(&s); 3294 s.next(); 3295 3296 // setup the initial block state 3297 _block = start_block; 3298 _state = start_block->state()->copy_for_parsing(); 3299 _last = start_block; 3300 load_local(objectType, 0); 3301 3302 // Emit the intrinsic node. 3303 bool result = try_inline_intrinsics(scope->method()); 3304 if (!result) BAILOUT("failed to inline intrinsic"); 3305 method_return(apop()); 3306 3307 // connect the begin and end blocks and we're all done. 3308 BlockEnd* end = last()->as_BlockEnd(); 3309 block()->set_end(end); 3310 break; 3311 } 3312 // Otherwise, fall thru 3313 } 3314 3315 default: 3316 scope_data()->add_to_work_list(start_block); 3317 iterate_all_blocks(); 3318 break; 3319 } 3320 CHECK_BAILOUT(); 3321 3322 _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state); 3323 3324 eliminate_redundant_phis(_start); 3325 3326 NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats()); 3327 // for osr compile, bailout if some requirements are not fulfilled 3328 if (osr_bci != -1) { 3329 BlockBegin* osr_block = blm.bci2block()->at(osr_bci); 3330 if (!osr_block->is_set(BlockBegin::was_visited_flag)) { 3331 BAILOUT("osr entry must have been visited for osr compile"); 3332 } 3333 3334 // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points 3335 if (!osr_block->state()->stack_is_empty()) { 3336 BAILOUT("stack not empty at OSR entry point"); 3337 } 3338 } 3339 #ifndef PRODUCT 3340 if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count); 3341 #endif 3342 } 3343 3344 3345 ValueStack* GraphBuilder::copy_state_before() { 3346 return copy_state_before_with_bci(bci()); 3347 } 3348 3349 ValueStack* GraphBuilder::copy_state_exhandling() { 3350 return copy_state_exhandling_with_bci(bci()); 3351 } 3352 3353 ValueStack* GraphBuilder::copy_state_for_exception() { 3354 return copy_state_for_exception_with_bci(bci()); 3355 } 3356 3357 ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) { 3358 return state()->copy(ValueStack::StateBefore, bci); 3359 } 3360 3361 ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) { 3362 if (!has_handler()) return NULL; 3363 return state()->copy(ValueStack::StateBefore, bci); 3364 } 3365 3366 ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) { 3367 ValueStack* s = copy_state_exhandling_with_bci(bci); 3368 if (s == NULL) { 3369 if (_compilation->env()->should_retain_local_variables()) { 3370 s = state()->copy(ValueStack::ExceptionState, bci); 3371 } else { 3372 s = state()->copy(ValueStack::EmptyExceptionState, bci); 3373 } 3374 } 3375 return s; 3376 } 3377 3378 int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const { 3379 int recur_level = 0; 3380 for (IRScope* s = scope(); s != NULL; s = s->caller()) { 3381 if (s->method() == cur_callee) { 3382 ++recur_level; 3383 } 3384 } 3385 return recur_level; 3386 } 3387 3388 3389 bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) { 3390 const char* msg = NULL; 3391 3392 // clear out any existing inline bailout condition 3393 clear_inline_bailout(); 3394 3395 // exclude methods we don't want to inline 3396 msg = should_not_inline(callee); 3397 if (msg != NULL) { 3398 print_inlining(callee, msg, /*success*/ false); 3399 return false; 3400 } 3401 3402 // method handle invokes 3403 if (callee->is_method_handle_intrinsic()) { 3404 if (try_method_handle_inline(callee, ignore_return)) { 3405 if (callee->has_reserved_stack_access()) { 3406 compilation()->set_has_reserved_stack_access(true); 3407 } 3408 return true; 3409 } 3410 return false; 3411 } 3412 3413 // handle intrinsics 3414 if (callee->intrinsic_id() != vmIntrinsics::_none && 3415 (CheckIntrinsics ? callee->intrinsic_candidate() : true)) { 3416 if (try_inline_intrinsics(callee, ignore_return)) { 3417 print_inlining(callee, "intrinsic"); 3418 if (callee->has_reserved_stack_access()) { 3419 compilation()->set_has_reserved_stack_access(true); 3420 } 3421 return true; 3422 } 3423 // try normal inlining 3424 } 3425 3426 // certain methods cannot be parsed at all 3427 msg = check_can_parse(callee); 3428 if (msg != NULL) { 3429 print_inlining(callee, msg, /*success*/ false); 3430 return false; 3431 } 3432 3433 // If bytecode not set use the current one. 3434 if (bc == Bytecodes::_illegal) { 3435 bc = code(); 3436 } 3437 if (try_inline_full(callee, holder_known, ignore_return, bc, receiver)) { 3438 if (callee->has_reserved_stack_access()) { 3439 compilation()->set_has_reserved_stack_access(true); 3440 } 3441 return true; 3442 } 3443 3444 // Entire compilation could fail during try_inline_full call. 3445 // In that case printing inlining decision info is useless. 3446 if (!bailed_out()) 3447 print_inlining(callee, _inline_bailout_msg, /*success*/ false); 3448 3449 return false; 3450 } 3451 3452 3453 const char* GraphBuilder::check_can_parse(ciMethod* callee) const { 3454 // Certain methods cannot be parsed at all: 3455 if ( callee->is_native()) return "native method"; 3456 if ( callee->is_abstract()) return "abstract method"; 3457 if (!callee->can_be_compiled()) return "not compilable (disabled)"; 3458 if (!callee->can_be_parsed()) return "cannot be parsed"; 3459 return NULL; 3460 } 3461 3462 // negative filter: should callee NOT be inlined? returns NULL, ok to inline, or rejection msg 3463 const char* GraphBuilder::should_not_inline(ciMethod* callee) const { 3464 if ( compilation()->directive()->should_not_inline(callee)) return "disallowed by CompileCommand"; 3465 if ( callee->dont_inline()) return "don't inline by annotation"; 3466 return NULL; 3467 } 3468 3469 void GraphBuilder::build_graph_for_intrinsic(ciMethod* callee, bool ignore_return) { 3470 vmIntrinsics::ID id = callee->intrinsic_id(); 3471 assert(id != vmIntrinsics::_none, "must be a VM intrinsic"); 3472 3473 // Some intrinsics need special IR nodes. 3474 switch(id) { 3475 case vmIntrinsics::_getObject : append_unsafe_get_obj(callee, T_OBJECT, false); return; 3476 case vmIntrinsics::_getBoolean : append_unsafe_get_obj(callee, T_BOOLEAN, false); return; 3477 case vmIntrinsics::_getByte : append_unsafe_get_obj(callee, T_BYTE, false); return; 3478 case vmIntrinsics::_getShort : append_unsafe_get_obj(callee, T_SHORT, false); return; 3479 case vmIntrinsics::_getChar : append_unsafe_get_obj(callee, T_CHAR, false); return; 3480 case vmIntrinsics::_getInt : append_unsafe_get_obj(callee, T_INT, false); return; 3481 case vmIntrinsics::_getLong : append_unsafe_get_obj(callee, T_LONG, false); return; 3482 case vmIntrinsics::_getFloat : append_unsafe_get_obj(callee, T_FLOAT, false); return; 3483 case vmIntrinsics::_getDouble : append_unsafe_get_obj(callee, T_DOUBLE, false); return; 3484 case vmIntrinsics::_putObject : append_unsafe_put_obj(callee, T_OBJECT, false); return; 3485 case vmIntrinsics::_putBoolean : append_unsafe_put_obj(callee, T_BOOLEAN, false); return; 3486 case vmIntrinsics::_putByte : append_unsafe_put_obj(callee, T_BYTE, false); return; 3487 case vmIntrinsics::_putShort : append_unsafe_put_obj(callee, T_SHORT, false); return; 3488 case vmIntrinsics::_putChar : append_unsafe_put_obj(callee, T_CHAR, false); return; 3489 case vmIntrinsics::_putInt : append_unsafe_put_obj(callee, T_INT, false); return; 3490 case vmIntrinsics::_putLong : append_unsafe_put_obj(callee, T_LONG, false); return; 3491 case vmIntrinsics::_putFloat : append_unsafe_put_obj(callee, T_FLOAT, false); return; 3492 case vmIntrinsics::_putDouble : append_unsafe_put_obj(callee, T_DOUBLE, false); return; 3493 case vmIntrinsics::_getShortUnaligned : append_unsafe_get_obj(callee, T_SHORT, false); return; 3494 case vmIntrinsics::_getCharUnaligned : append_unsafe_get_obj(callee, T_CHAR, false); return; 3495 case vmIntrinsics::_getIntUnaligned : append_unsafe_get_obj(callee, T_INT, false); return; 3496 case vmIntrinsics::_getLongUnaligned : append_unsafe_get_obj(callee, T_LONG, false); return; 3497 case vmIntrinsics::_putShortUnaligned : append_unsafe_put_obj(callee, T_SHORT, false); return; 3498 case vmIntrinsics::_putCharUnaligned : append_unsafe_put_obj(callee, T_CHAR, false); return; 3499 case vmIntrinsics::_putIntUnaligned : append_unsafe_put_obj(callee, T_INT, false); return; 3500 case vmIntrinsics::_putLongUnaligned : append_unsafe_put_obj(callee, T_LONG, false); return; 3501 case vmIntrinsics::_getObjectVolatile : append_unsafe_get_obj(callee, T_OBJECT, true); return; 3502 case vmIntrinsics::_getBooleanVolatile : append_unsafe_get_obj(callee, T_BOOLEAN, true); return; 3503 case vmIntrinsics::_getByteVolatile : append_unsafe_get_obj(callee, T_BYTE, true); return; 3504 case vmIntrinsics::_getShortVolatile : append_unsafe_get_obj(callee, T_SHORT, true); return; 3505 case vmIntrinsics::_getCharVolatile : append_unsafe_get_obj(callee, T_CHAR, true); return; 3506 case vmIntrinsics::_getIntVolatile : append_unsafe_get_obj(callee, T_INT, true); return; 3507 case vmIntrinsics::_getLongVolatile : append_unsafe_get_obj(callee, T_LONG, true); return; 3508 case vmIntrinsics::_getFloatVolatile : append_unsafe_get_obj(callee, T_FLOAT, true); return; 3509 case vmIntrinsics::_getDoubleVolatile : append_unsafe_get_obj(callee, T_DOUBLE, true); return; 3510 case vmIntrinsics::_putObjectVolatile : append_unsafe_put_obj(callee, T_OBJECT, true); return; 3511 case vmIntrinsics::_putBooleanVolatile : append_unsafe_put_obj(callee, T_BOOLEAN, true); return; 3512 case vmIntrinsics::_putByteVolatile : append_unsafe_put_obj(callee, T_BYTE, true); return; 3513 case vmIntrinsics::_putShortVolatile : append_unsafe_put_obj(callee, T_SHORT, true); return; 3514 case vmIntrinsics::_putCharVolatile : append_unsafe_put_obj(callee, T_CHAR, true); return; 3515 case vmIntrinsics::_putIntVolatile : append_unsafe_put_obj(callee, T_INT, true); return; 3516 case vmIntrinsics::_putLongVolatile : append_unsafe_put_obj(callee, T_LONG, true); return; 3517 case vmIntrinsics::_putFloatVolatile : append_unsafe_put_obj(callee, T_FLOAT, true); return; 3518 case vmIntrinsics::_putDoubleVolatile : append_unsafe_put_obj(callee, T_DOUBLE, true); return; 3519 case vmIntrinsics::_compareAndSetLong: 3520 case vmIntrinsics::_compareAndSetInt: 3521 case vmIntrinsics::_compareAndSetObject: append_unsafe_CAS(callee); return; 3522 case vmIntrinsics::_getAndAddInt: 3523 case vmIntrinsics::_getAndAddLong : append_unsafe_get_and_set_obj(callee, true); return; 3524 case vmIntrinsics::_getAndSetInt : 3525 case vmIntrinsics::_getAndSetLong : 3526 case vmIntrinsics::_getAndSetObject : append_unsafe_get_and_set_obj(callee, false); return; 3527 case vmIntrinsics::_getCharStringU : append_char_access(callee, false); return; 3528 case vmIntrinsics::_putCharStringU : append_char_access(callee, true); return; 3529 default: 3530 break; 3531 } 3532 3533 // create intrinsic node 3534 const bool has_receiver = !callee->is_static(); 3535 ValueType* result_type = as_ValueType(callee->return_type()); 3536 ValueStack* state_before = copy_state_for_exception(); 3537 3538 Values* args = state()->pop_arguments(callee->arg_size()); 3539 3540 if (is_profiling()) { 3541 // Don't profile in the special case where the root method 3542 // is the intrinsic 3543 if (callee != method()) { 3544 // Note that we'd collect profile data in this method if we wanted it. 3545 compilation()->set_would_profile(true); 3546 if (profile_calls()) { 3547 Value recv = NULL; 3548 if (has_receiver) { 3549 recv = args->at(0); 3550 null_check(recv); 3551 } 3552 profile_call(callee, recv, NULL, collect_args_for_profiling(args, callee, true), true); 3553 } 3554 } 3555 } 3556 3557 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), 3558 args, has_receiver, state_before, 3559 vmIntrinsics::preserves_state(id), 3560 vmIntrinsics::can_trap(id)); 3561 // append instruction & push result 3562 Value value = append_split(result); 3563 if (result_type != voidType && !ignore_return) { 3564 push(result_type, value); 3565 } 3566 3567 if (callee != method() && profile_return() && result_type->is_object_kind()) { 3568 profile_return_type(result, callee); 3569 } 3570 } 3571 3572 bool GraphBuilder::try_inline_intrinsics(ciMethod* callee, bool ignore_return) { 3573 // Not a trivial method because C2 may do intrinsics better. 3574 compilation()->set_would_profile(true); 3575 3576 // For calling is_intrinsic_available we need to transition to 3577 // the '_thread_in_vm' state because is_intrinsic_available() 3578 // accesses critical VM-internal data. 3579 bool is_available = false; 3580 { 3581 VM_ENTRY_MARK; 3582 methodHandle mh(THREAD, callee->get_Method()); 3583 is_available = _compilation->compiler()->is_intrinsic_available(mh, _compilation->directive()); 3584 } 3585 3586 if (!is_available) { 3587 if (!InlineNatives) { 3588 // Return false and also set message that the inlining of 3589 // intrinsics has been disabled in general. 3590 INLINE_BAILOUT("intrinsic method inlining disabled"); 3591 } else { 3592 return false; 3593 } 3594 } 3595 build_graph_for_intrinsic(callee, ignore_return); 3596 return true; 3597 } 3598 3599 3600 bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) { 3601 // Introduce a new callee continuation point - all Ret instructions 3602 // will be replaced with Gotos to this point. 3603 BlockBegin* cont = block_at(next_bci()); 3604 assert(cont != NULL, "continuation must exist (BlockListBuilder starts a new block after a jsr"); 3605 3606 // Note: can not assign state to continuation yet, as we have to 3607 // pick up the state from the Ret instructions. 3608 3609 // Push callee scope 3610 push_scope_for_jsr(cont, jsr_dest_bci); 3611 3612 // Temporarily set up bytecode stream so we can append instructions 3613 // (only using the bci of this stream) 3614 scope_data()->set_stream(scope_data()->parent()->stream()); 3615 3616 BlockBegin* jsr_start_block = block_at(jsr_dest_bci); 3617 assert(jsr_start_block != NULL, "jsr start block must exist"); 3618 assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet"); 3619 Goto* goto_sub = new Goto(jsr_start_block, false); 3620 // Must copy state to avoid wrong sharing when parsing bytecodes 3621 assert(jsr_start_block->state() == NULL, "should have fresh jsr starting block"); 3622 jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci)); 3623 append(goto_sub); 3624 _block->set_end(goto_sub); 3625 _last = _block = jsr_start_block; 3626 3627 // Clear out bytecode stream 3628 scope_data()->set_stream(NULL); 3629 3630 scope_data()->add_to_work_list(jsr_start_block); 3631 3632 // Ready to resume parsing in subroutine 3633 iterate_all_blocks(); 3634 3635 // If we bailed out during parsing, return immediately (this is bad news) 3636 CHECK_BAILOUT_(false); 3637 3638 // Detect whether the continuation can actually be reached. If not, 3639 // it has not had state set by the join() operations in 3640 // iterate_bytecodes_for_block()/ret() and we should not touch the 3641 // iteration state. The calling activation of 3642 // iterate_bytecodes_for_block will then complete normally. 3643 if (cont->state() != NULL) { 3644 if (!cont->is_set(BlockBegin::was_visited_flag)) { 3645 // add continuation to work list instead of parsing it immediately 3646 scope_data()->parent()->add_to_work_list(cont); 3647 } 3648 } 3649 3650 assert(jsr_continuation() == cont, "continuation must not have changed"); 3651 assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) || 3652 jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag), 3653 "continuation can only be visited in case of backward branches"); 3654 assert(_last && _last->as_BlockEnd(), "block must have end"); 3655 3656 // continuation is in work list, so end iteration of current block 3657 _skip_block = true; 3658 pop_scope_for_jsr(); 3659 3660 return true; 3661 } 3662 3663 3664 // Inline the entry of a synchronized method as a monitor enter and 3665 // register the exception handler which releases the monitor if an 3666 // exception is thrown within the callee. Note that the monitor enter 3667 // cannot throw an exception itself, because the receiver is 3668 // guaranteed to be non-null by the explicit null check at the 3669 // beginning of inlining. 3670 void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) { 3671 assert(lock != NULL && sync_handler != NULL, "lock or handler missing"); 3672 3673 monitorenter(lock, SynchronizationEntryBCI); 3674 assert(_last->as_MonitorEnter() != NULL, "monitor enter expected"); 3675 _last->set_needs_null_check(false); 3676 3677 sync_handler->set(BlockBegin::exception_entry_flag); 3678 sync_handler->set(BlockBegin::is_on_work_list_flag); 3679 3680 ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0); 3681 XHandler* h = new XHandler(desc); 3682 h->set_entry_block(sync_handler); 3683 scope_data()->xhandlers()->append(h); 3684 scope_data()->set_has_handler(); 3685 } 3686 3687 3688 // If an exception is thrown and not handled within an inlined 3689 // synchronized method, the monitor must be released before the 3690 // exception is rethrown in the outer scope. Generate the appropriate 3691 // instructions here. 3692 void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) { 3693 BlockBegin* orig_block = _block; 3694 ValueStack* orig_state = _state; 3695 Instruction* orig_last = _last; 3696 _last = _block = sync_handler; 3697 _state = sync_handler->state()->copy(); 3698 3699 assert(sync_handler != NULL, "handler missing"); 3700 assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here"); 3701 3702 assert(lock != NULL || default_handler, "lock or handler missing"); 3703 3704 XHandler* h = scope_data()->xhandlers()->remove_last(); 3705 assert(h->entry_block() == sync_handler, "corrupt list of handlers"); 3706 3707 block()->set(BlockBegin::was_visited_flag); 3708 Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI); 3709 assert(exception->is_pinned(), "must be"); 3710 3711 int bci = SynchronizationEntryBCI; 3712 if (compilation()->env()->dtrace_method_probes()) { 3713 // Report exit from inline methods. We don't have a stream here 3714 // so pass an explicit bci of SynchronizationEntryBCI. 3715 Values* args = new Values(1); 3716 args->push(append_with_bci(new Constant(new MethodConstant(method())), bci)); 3717 append_with_bci(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args), bci); 3718 } 3719 3720 if (lock) { 3721 assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing"); 3722 if (!lock->is_linked()) { 3723 lock = append_with_bci(lock, bci); 3724 } 3725 3726 // exit the monitor in the context of the synchronized method 3727 monitorexit(lock, bci); 3728 3729 // exit the context of the synchronized method 3730 if (!default_handler) { 3731 pop_scope(); 3732 bci = _state->caller_state()->bci(); 3733 _state = _state->caller_state()->copy_for_parsing(); 3734 } 3735 } 3736 3737 // perform the throw as if at the the call site 3738 apush(exception); 3739 throw_op(bci); 3740 3741 BlockEnd* end = last()->as_BlockEnd(); 3742 block()->set_end(end); 3743 3744 _block = orig_block; 3745 _state = orig_state; 3746 _last = orig_last; 3747 } 3748 3749 3750 bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) { 3751 assert(!callee->is_native(), "callee must not be native"); 3752 if (CompilationPolicy::policy()->should_not_inline(compilation()->env(), callee)) { 3753 INLINE_BAILOUT("inlining prohibited by policy"); 3754 } 3755 // first perform tests of things it's not possible to inline 3756 if (callee->has_exception_handlers() && 3757 !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers"); 3758 if (callee->is_synchronized() && 3759 !InlineSynchronizedMethods ) INLINE_BAILOUT("callee is synchronized"); 3760 if (!callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet"); 3761 if (!callee->has_balanced_monitors()) INLINE_BAILOUT("callee's monitors do not match"); 3762 3763 // Proper inlining of methods with jsrs requires a little more work. 3764 if (callee->has_jsrs() ) INLINE_BAILOUT("jsrs not handled properly by inliner yet"); 3765 3766 // When SSE2 is used on intel, then no special handling is needed 3767 // for strictfp because the enum-constant is fixed at compile time, 3768 // the check for UseSSE2 is needed here 3769 if (strict_fp_requires_explicit_rounding && UseSSE < 2 && method()->is_strict() != callee->is_strict()) { 3770 INLINE_BAILOUT("caller and callee have different strict fp requirements"); 3771 } 3772 3773 if (is_profiling() && !callee->ensure_method_data()) { 3774 INLINE_BAILOUT("mdo allocation failed"); 3775 } 3776 3777 // now perform tests that are based on flag settings 3778 bool inlinee_by_directive = compilation()->directive()->should_inline(callee); 3779 if (callee->force_inline() || inlinee_by_directive) { 3780 if (inline_level() > MaxForceInlineLevel ) INLINE_BAILOUT("MaxForceInlineLevel"); 3781 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep"); 3782 3783 const char* msg = ""; 3784 if (callee->force_inline()) msg = "force inline by annotation"; 3785 if (inlinee_by_directive) msg = "force inline by CompileCommand"; 3786 print_inlining(callee, msg); 3787 } else { 3788 // use heuristic controls on inlining 3789 if (inline_level() > MaxInlineLevel ) INLINE_BAILOUT("inlining too deep"); 3790 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep"); 3791 if (callee->code_size_for_inlining() > max_inline_size() ) INLINE_BAILOUT("callee is too large"); 3792 3793 // don't inline throwable methods unless the inlining tree is rooted in a throwable class 3794 if (callee->name() == ciSymbol::object_initializer_name() && 3795 callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) { 3796 // Throwable constructor call 3797 IRScope* top = scope(); 3798 while (top->caller() != NULL) { 3799 top = top->caller(); 3800 } 3801 if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) { 3802 INLINE_BAILOUT("don't inline Throwable constructors"); 3803 } 3804 } 3805 3806 if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) { 3807 INLINE_BAILOUT("total inlining greater than DesiredMethodLimit"); 3808 } 3809 // printing 3810 print_inlining(callee); 3811 } 3812 3813 // NOTE: Bailouts from this point on, which occur at the 3814 // GraphBuilder level, do not cause bailout just of the inlining but 3815 // in fact of the entire compilation. 3816 3817 BlockBegin* orig_block = block(); 3818 3819 const bool is_invokedynamic = bc == Bytecodes::_invokedynamic; 3820 const bool has_receiver = (bc != Bytecodes::_invokestatic && !is_invokedynamic); 3821 3822 const int args_base = state()->stack_size() - callee->arg_size(); 3823 assert(args_base >= 0, "stack underflow during inlining"); 3824 3825 // Insert null check if necessary 3826 Value recv = NULL; 3827 if (has_receiver) { 3828 // note: null check must happen even if first instruction of callee does 3829 // an implicit null check since the callee is in a different scope 3830 // and we must make sure exception handling does the right thing 3831 assert(!callee->is_static(), "callee must not be static"); 3832 assert(callee->arg_size() > 0, "must have at least a receiver"); 3833 recv = state()->stack_at(args_base); 3834 null_check(recv); 3835 } 3836 3837 if (is_profiling()) { 3838 // Note that we'd collect profile data in this method if we wanted it. 3839 // this may be redundant here... 3840 compilation()->set_would_profile(true); 3841 3842 if (profile_calls()) { 3843 int start = 0; 3844 Values* obj_args = args_list_for_profiling(callee, start, has_receiver); 3845 if (obj_args != NULL) { 3846 int s = obj_args->max_length(); 3847 // if called through method handle invoke, some arguments may have been popped 3848 for (int i = args_base+start, j = 0; j < obj_args->max_length() && i < state()->stack_size(); ) { 3849 Value v = state()->stack_at_inc(i); 3850 if (v->type()->is_object_kind()) { 3851 obj_args->push(v); 3852 j++; 3853 } 3854 } 3855 check_args_for_profiling(obj_args, s); 3856 } 3857 profile_call(callee, recv, holder_known ? callee->holder() : NULL, obj_args, true); 3858 } 3859 } 3860 3861 // Introduce a new callee continuation point - if the callee has 3862 // more than one return instruction or the return does not allow 3863 // fall-through of control flow, all return instructions of the 3864 // callee will need to be replaced by Goto's pointing to this 3865 // continuation point. 3866 BlockBegin* cont = block_at(next_bci()); 3867 bool continuation_existed = true; 3868 if (cont == NULL) { 3869 cont = new BlockBegin(next_bci()); 3870 // low number so that continuation gets parsed as early as possible 3871 cont->set_depth_first_number(0); 3872 if (PrintInitialBlockList) { 3873 tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d", 3874 cont->block_id(), cont->bci(), bci()); 3875 } 3876 continuation_existed = false; 3877 } 3878 // Record number of predecessors of continuation block before 3879 // inlining, to detect if inlined method has edges to its 3880 // continuation after inlining. 3881 int continuation_preds = cont->number_of_preds(); 3882 3883 // Push callee scope 3884 push_scope(callee, cont); 3885 3886 // the BlockListBuilder for the callee could have bailed out 3887 if (bailed_out()) 3888 return false; 3889 3890 // Temporarily set up bytecode stream so we can append instructions 3891 // (only using the bci of this stream) 3892 scope_data()->set_stream(scope_data()->parent()->stream()); 3893 3894 // Pass parameters into callee state: add assignments 3895 // note: this will also ensure that all arguments are computed before being passed 3896 ValueStack* callee_state = state(); 3897 ValueStack* caller_state = state()->caller_state(); 3898 for (int i = args_base; i < caller_state->stack_size(); ) { 3899 const int arg_no = i - args_base; 3900 Value arg = caller_state->stack_at_inc(i); 3901 store_local(callee_state, arg, arg_no); 3902 } 3903 3904 // Remove args from stack. 3905 // Note that we preserve locals state in case we can use it later 3906 // (see use of pop_scope() below) 3907 caller_state->truncate_stack(args_base); 3908 assert(callee_state->stack_size() == 0, "callee stack must be empty"); 3909 3910 Value lock = NULL; 3911 BlockBegin* sync_handler = NULL; 3912 3913 // Inline the locking of the receiver if the callee is synchronized 3914 if (callee->is_synchronized()) { 3915 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror()))) 3916 : state()->local_at(0); 3917 sync_handler = new BlockBegin(SynchronizationEntryBCI); 3918 inline_sync_entry(lock, sync_handler); 3919 } 3920 3921 if (compilation()->env()->dtrace_method_probes()) { 3922 Values* args = new Values(1); 3923 args->push(append(new Constant(new MethodConstant(method())))); 3924 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args)); 3925 } 3926 3927 if (profile_inlined_calls()) { 3928 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI)); 3929 } 3930 3931 BlockBegin* callee_start_block = block_at(0); 3932 if (callee_start_block != NULL) { 3933 assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header"); 3934 Goto* goto_callee = new Goto(callee_start_block, false); 3935 // The state for this goto is in the scope of the callee, so use 3936 // the entry bci for the callee instead of the call site bci. 3937 append_with_bci(goto_callee, 0); 3938 _block->set_end(goto_callee); 3939 callee_start_block->merge(callee_state); 3940 3941 _last = _block = callee_start_block; 3942 3943 scope_data()->add_to_work_list(callee_start_block); 3944 } 3945 3946 // Clear out bytecode stream 3947 scope_data()->set_stream(NULL); 3948 scope_data()->set_ignore_return(ignore_return); 3949 3950 CompileLog* log = compilation()->log(); 3951 if (log != NULL) log->head("parse method='%d'", log->identify(callee)); 3952 3953 // Ready to resume parsing in callee (either in the same block we 3954 // were in before or in the callee's start block) 3955 iterate_all_blocks(callee_start_block == NULL); 3956 3957 if (log != NULL) log->done("parse"); 3958 3959 // If we bailed out during parsing, return immediately (this is bad news) 3960 if (bailed_out()) 3961 return false; 3962 3963 // iterate_all_blocks theoretically traverses in random order; in 3964 // practice, we have only traversed the continuation if we are 3965 // inlining into a subroutine 3966 assert(continuation_existed || 3967 !continuation()->is_set(BlockBegin::was_visited_flag), 3968 "continuation should not have been parsed yet if we created it"); 3969 3970 // At this point we are almost ready to return and resume parsing of 3971 // the caller back in the GraphBuilder. The only thing we want to do 3972 // first is an optimization: during parsing of the callee we 3973 // generated at least one Goto to the continuation block. If we 3974 // generated exactly one, and if the inlined method spanned exactly 3975 // one block (and we didn't have to Goto its entry), then we snip 3976 // off the Goto to the continuation, allowing control to fall 3977 // through back into the caller block and effectively performing 3978 // block merging. This allows load elimination and CSE to take place 3979 // across multiple callee scopes if they are relatively simple, and 3980 // is currently essential to making inlining profitable. 3981 if (num_returns() == 1 3982 && block() == orig_block 3983 && block() == inline_cleanup_block()) { 3984 _last = inline_cleanup_return_prev(); 3985 _state = inline_cleanup_state(); 3986 } else if (continuation_preds == cont->number_of_preds()) { 3987 // Inlining caused that the instructions after the invoke in the 3988 // caller are not reachable any more. So skip filling this block 3989 // with instructions! 3990 assert(cont == continuation(), ""); 3991 assert(_last && _last->as_BlockEnd(), ""); 3992 _skip_block = true; 3993 } else { 3994 // Resume parsing in continuation block unless it was already parsed. 3995 // Note that if we don't change _last here, iteration in 3996 // iterate_bytecodes_for_block will stop when we return. 3997 if (!continuation()->is_set(BlockBegin::was_visited_flag)) { 3998 // add continuation to work list instead of parsing it immediately 3999 assert(_last && _last->as_BlockEnd(), ""); 4000 scope_data()->parent()->add_to_work_list(continuation()); 4001 _skip_block = true; 4002 } 4003 } 4004 4005 // Fill the exception handler for synchronized methods with instructions 4006 if (callee->is_synchronized() && sync_handler->state() != NULL) { 4007 fill_sync_handler(lock, sync_handler); 4008 } else { 4009 pop_scope(); 4010 } 4011 4012 compilation()->notice_inlined_method(callee); 4013 4014 return true; 4015 } 4016 4017 4018 bool GraphBuilder::try_method_handle_inline(ciMethod* callee, bool ignore_return) { 4019 ValueStack* state_before = copy_state_before(); 4020 vmIntrinsics::ID iid = callee->intrinsic_id(); 4021 switch (iid) { 4022 case vmIntrinsics::_invokeBasic: 4023 { 4024 // get MethodHandle receiver 4025 const int args_base = state()->stack_size() - callee->arg_size(); 4026 ValueType* type = state()->stack_at(args_base)->type(); 4027 if (type->is_constant()) { 4028 ciMethod* target = type->as_ObjectType()->constant_value()->as_method_handle()->get_vmtarget(); 4029 // We don't do CHA here so only inline static and statically bindable methods. 4030 if (target->is_static() || target->can_be_statically_bound()) { 4031 if (ciMethod::is_consistent_info(callee, target)) { 4032 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual; 4033 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void()); 4034 if (try_inline(target, /*holder_known*/ true, ignore_return, bc)) { 4035 return true; 4036 } 4037 } else { 4038 print_inlining(target, "signatures mismatch", /*success*/ false); 4039 } 4040 } else { 4041 print_inlining(target, "not static or statically bindable", /*success*/ false); 4042 } 4043 } else { 4044 print_inlining(callee, "receiver not constant", /*success*/ false); 4045 } 4046 } 4047 break; 4048 4049 case vmIntrinsics::_linkToVirtual: 4050 case vmIntrinsics::_linkToStatic: 4051 case vmIntrinsics::_linkToSpecial: 4052 case vmIntrinsics::_linkToInterface: 4053 { 4054 // pop MemberName argument 4055 const int args_base = state()->stack_size() - callee->arg_size(); 4056 ValueType* type = apop()->type(); 4057 if (type->is_constant()) { 4058 ciMethod* target = type->as_ObjectType()->constant_value()->as_member_name()->get_vmtarget(); 4059 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void()); 4060 // If the target is another method handle invoke, try to recursively get 4061 // a better target. 4062 if (target->is_method_handle_intrinsic()) { 4063 if (try_method_handle_inline(target, ignore_return)) { 4064 return true; 4065 } 4066 } else if (!ciMethod::is_consistent_info(callee, target)) { 4067 print_inlining(target, "signatures mismatch", /*success*/ false); 4068 } else { 4069 ciSignature* signature = target->signature(); 4070 const int receiver_skip = target->is_static() ? 0 : 1; 4071 // Cast receiver to its type. 4072 if (!target->is_static()) { 4073 ciKlass* tk = signature->accessing_klass(); 4074 Value obj = state()->stack_at(args_base); 4075 if (obj->exact_type() == NULL && 4076 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) { 4077 TypeCast* c = new TypeCast(tk, obj, state_before); 4078 append(c); 4079 state()->stack_at_put(args_base, c); 4080 } 4081 } 4082 // Cast reference arguments to its type. 4083 for (int i = 0, j = 0; i < signature->count(); i++) { 4084 ciType* t = signature->type_at(i); 4085 if (t->is_klass()) { 4086 ciKlass* tk = t->as_klass(); 4087 Value obj = state()->stack_at(args_base + receiver_skip + j); 4088 if (obj->exact_type() == NULL && 4089 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) { 4090 TypeCast* c = new TypeCast(t, obj, state_before); 4091 append(c); 4092 state()->stack_at_put(args_base + receiver_skip + j, c); 4093 } 4094 } 4095 j += t->size(); // long and double take two slots 4096 } 4097 // We don't do CHA here so only inline static and statically bindable methods. 4098 if (target->is_static() || target->can_be_statically_bound()) { 4099 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual; 4100 if (try_inline(target, /*holder_known*/ true, ignore_return, bc)) { 4101 return true; 4102 } 4103 } else { 4104 print_inlining(target, "not static or statically bindable", /*success*/ false); 4105 } 4106 } 4107 } else { 4108 print_inlining(callee, "MemberName not constant", /*success*/ false); 4109 } 4110 } 4111 break; 4112 4113 default: 4114 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)); 4115 break; 4116 } 4117 set_state(state_before->copy_for_parsing()); 4118 return false; 4119 } 4120 4121 4122 void GraphBuilder::inline_bailout(const char* msg) { 4123 assert(msg != NULL, "inline bailout msg must exist"); 4124 _inline_bailout_msg = msg; 4125 } 4126 4127 4128 void GraphBuilder::clear_inline_bailout() { 4129 _inline_bailout_msg = NULL; 4130 } 4131 4132 4133 void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) { 4134 ScopeData* data = new ScopeData(NULL); 4135 data->set_scope(scope); 4136 data->set_bci2block(bci2block); 4137 _scope_data = data; 4138 _block = start; 4139 } 4140 4141 4142 void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) { 4143 IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false); 4144 scope()->add_callee(callee_scope); 4145 4146 BlockListBuilder blb(compilation(), callee_scope, -1); 4147 CHECK_BAILOUT(); 4148 4149 if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) { 4150 // this scope can be inlined directly into the caller so remove 4151 // the block at bci 0. 4152 blb.bci2block()->at_put(0, NULL); 4153 } 4154 4155 set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci()))); 4156 4157 ScopeData* data = new ScopeData(scope_data()); 4158 data->set_scope(callee_scope); 4159 data->set_bci2block(blb.bci2block()); 4160 data->set_continuation(continuation); 4161 _scope_data = data; 4162 } 4163 4164 4165 void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) { 4166 ScopeData* data = new ScopeData(scope_data()); 4167 data->set_parsing_jsr(); 4168 data->set_jsr_entry_bci(jsr_dest_bci); 4169 data->set_jsr_return_address_local(-1); 4170 // Must clone bci2block list as we will be mutating it in order to 4171 // properly clone all blocks in jsr region as well as exception 4172 // handlers containing rets 4173 BlockList* new_bci2block = new BlockList(bci2block()->length()); 4174 new_bci2block->appendAll(bci2block()); 4175 data->set_bci2block(new_bci2block); 4176 data->set_scope(scope()); 4177 data->setup_jsr_xhandlers(); 4178 data->set_continuation(continuation()); 4179 data->set_jsr_continuation(jsr_continuation); 4180 _scope_data = data; 4181 } 4182 4183 4184 void GraphBuilder::pop_scope() { 4185 int number_of_locks = scope()->number_of_locks(); 4186 _scope_data = scope_data()->parent(); 4187 // accumulate minimum number of monitor slots to be reserved 4188 scope()->set_min_number_of_locks(number_of_locks); 4189 } 4190 4191 4192 void GraphBuilder::pop_scope_for_jsr() { 4193 _scope_data = scope_data()->parent(); 4194 } 4195 4196 void GraphBuilder::append_unsafe_get_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 Instruction* op = append(new UnsafeGetObject(t, args->at(1), offset, is_volatile)); 4204 push(op->type(), op); 4205 compilation()->set_has_unsafe_access(true); 4206 } 4207 4208 4209 void GraphBuilder::append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile) { 4210 Values* args = state()->pop_arguments(callee->arg_size()); 4211 null_check(args->at(0)); 4212 Instruction* offset = args->at(2); 4213 #ifndef _LP64 4214 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4215 #endif 4216 Value val = args->at(3); 4217 if (t == T_BOOLEAN) { 4218 Value mask = append(new Constant(new IntConstant(1))); 4219 val = append(new LogicOp(Bytecodes::_iand, val, mask)); 4220 } 4221 Instruction* op = append(new UnsafePutObject(t, args->at(1), offset, val, is_volatile)); 4222 compilation()->set_has_unsafe_access(true); 4223 kill_all(); 4224 } 4225 4226 4227 void GraphBuilder::append_unsafe_get_raw(ciMethod* callee, BasicType t) { 4228 Values* args = state()->pop_arguments(callee->arg_size()); 4229 null_check(args->at(0)); 4230 Instruction* op = append(new UnsafeGetRaw(t, args->at(1), false)); 4231 push(op->type(), op); 4232 compilation()->set_has_unsafe_access(true); 4233 } 4234 4235 4236 void GraphBuilder::append_unsafe_put_raw(ciMethod* callee, BasicType t) { 4237 Values* args = state()->pop_arguments(callee->arg_size()); 4238 null_check(args->at(0)); 4239 Instruction* op = append(new UnsafePutRaw(t, args->at(1), args->at(2))); 4240 compilation()->set_has_unsafe_access(true); 4241 } 4242 4243 4244 void GraphBuilder::append_unsafe_CAS(ciMethod* callee) { 4245 ValueStack* state_before = copy_state_for_exception(); 4246 ValueType* result_type = as_ValueType(callee->return_type()); 4247 assert(result_type->is_int(), "int result"); 4248 Values* args = state()->pop_arguments(callee->arg_size()); 4249 4250 // Pop off some args to specially handle, then push back 4251 Value newval = args->pop(); 4252 Value cmpval = args->pop(); 4253 Value offset = args->pop(); 4254 Value src = args->pop(); 4255 Value unsafe_obj = args->pop(); 4256 4257 // Separately handle the unsafe arg. It is not needed for code 4258 // generation, but must be null checked 4259 null_check(unsafe_obj); 4260 4261 #ifndef _LP64 4262 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4263 #endif 4264 4265 args->push(src); 4266 args->push(offset); 4267 args->push(cmpval); 4268 args->push(newval); 4269 4270 // An unsafe CAS can alias with other field accesses, but we don't 4271 // know which ones so mark the state as no preserved. This will 4272 // cause CSE to invalidate memory across it. 4273 bool preserves_state = false; 4274 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state); 4275 append_split(result); 4276 push(result_type, result); 4277 compilation()->set_has_unsafe_access(true); 4278 } 4279 4280 void GraphBuilder::append_char_access(ciMethod* callee, bool is_store) { 4281 // This intrinsic accesses byte[] array as char[] array. Computing the offsets 4282 // correctly requires matched array shapes. 4283 assert (arrayOopDesc::base_offset_in_bytes(T_CHAR) == arrayOopDesc::base_offset_in_bytes(T_BYTE), 4284 "sanity: byte[] and char[] bases agree"); 4285 assert (type2aelembytes(T_CHAR) == type2aelembytes(T_BYTE)*2, 4286 "sanity: byte[] and char[] scales agree"); 4287 4288 ValueStack* state_before = copy_state_indexed_access(); 4289 compilation()->set_has_access_indexed(true); 4290 Values* args = state()->pop_arguments(callee->arg_size()); 4291 Value array = args->at(0); 4292 Value index = args->at(1); 4293 if (is_store) { 4294 Value value = args->at(2); 4295 Instruction* store = append(new StoreIndexed(array, index, NULL, T_CHAR, value, state_before, false, true)); 4296 store->set_flag(Instruction::NeedsRangeCheckFlag, false); 4297 _memory->store_value(value); 4298 } else { 4299 Instruction* load = append(new LoadIndexed(array, index, NULL, T_CHAR, state_before, true)); 4300 load->set_flag(Instruction::NeedsRangeCheckFlag, false); 4301 push(load->type(), load); 4302 } 4303 } 4304 4305 void GraphBuilder::print_inlining(ciMethod* callee, const char* msg, bool success) { 4306 CompileLog* log = compilation()->log(); 4307 if (log != NULL) { 4308 if (success) { 4309 if (msg != NULL) 4310 log->inline_success(msg); 4311 else 4312 log->inline_success("receiver is statically known"); 4313 } else { 4314 if (msg != NULL) 4315 log->inline_fail(msg); 4316 else 4317 log->inline_fail("reason unknown"); 4318 } 4319 } 4320 #if INCLUDE_TRACE 4321 EventCompilerInlining event; 4322 if (event.should_commit()) { 4323 event.set_compileId(compilation()->env()->task()->compile_id()); 4324 event.set_message(msg); 4325 event.set_succeeded(success); 4326 event.set_bci(bci()); 4327 event.set_caller(method()->get_Method()); 4328 event.set_callee(callee->to_trace_struct()); 4329 event.commit(); 4330 } 4331 #endif // INCLUDE_TRACE 4332 4333 CompileTask::print_inlining_ul(callee, scope()->level(), bci(), msg); 4334 4335 if (!compilation()->directive()->PrintInliningOption) { 4336 return; 4337 } 4338 CompileTask::print_inlining_tty(callee, scope()->level(), bci(), msg); 4339 if (success && CIPrintMethodCodes) { 4340 callee->print_codes(); 4341 } 4342 } 4343 4344 void GraphBuilder::append_unsafe_get_and_set_obj(ciMethod* callee, bool is_add) { 4345 Values* args = state()->pop_arguments(callee->arg_size()); 4346 BasicType t = callee->return_type()->basic_type(); 4347 null_check(args->at(0)); 4348 Instruction* offset = args->at(2); 4349 #ifndef _LP64 4350 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4351 #endif 4352 Instruction* op = append(new UnsafeGetAndSetObject(t, args->at(1), offset, args->at(3), is_add)); 4353 compilation()->set_has_unsafe_access(true); 4354 kill_all(); 4355 push(op->type(), op); 4356 } 4357 4358 #ifndef PRODUCT 4359 void GraphBuilder::print_stats() { 4360 vmap()->print(); 4361 } 4362 #endif // PRODUCT 4363 4364 void GraphBuilder::profile_call(ciMethod* callee, Value recv, ciKlass* known_holder, Values* obj_args, bool inlined) { 4365 assert(known_holder == NULL || (known_holder->is_instance_klass() && 4366 (!known_holder->is_interface() || 4367 ((ciInstanceKlass*)known_holder)->has_nonstatic_concrete_methods())), "should be non-static concrete method"); 4368 if (known_holder != NULL) { 4369 if (known_holder->exact_klass() == NULL) { 4370 known_holder = compilation()->cha_exact_type(known_holder); 4371 } 4372 } 4373 4374 append(new ProfileCall(method(), bci(), callee, recv, known_holder, obj_args, inlined)); 4375 } 4376 4377 void GraphBuilder::profile_return_type(Value ret, ciMethod* callee, ciMethod* m, int invoke_bci) { 4378 assert((m == NULL) == (invoke_bci < 0), "invalid method and invalid bci together"); 4379 if (m == NULL) { 4380 m = method(); 4381 } 4382 if (invoke_bci < 0) { 4383 invoke_bci = bci(); 4384 } 4385 ciMethodData* md = m->method_data_or_null(); 4386 ciProfileData* data = md->bci_to_data(invoke_bci); 4387 if (data != NULL && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) { 4388 bool has_return = data->is_CallTypeData() ? ((ciCallTypeData*)data)->has_return() : ((ciVirtualCallTypeData*)data)->has_return(); 4389 if (has_return) { 4390 append(new ProfileReturnType(m , invoke_bci, callee, ret)); 4391 } 4392 } 4393 } 4394 4395 void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) { 4396 append(new ProfileInvoke(callee, state)); 4397 }