1 /* 2 * Copyright (c) 1999, 2019, 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 "ci/ciUtilities.inline.hpp" 36 #include "compiler/compileBroker.hpp" 37 #include "interpreter/bytecode.hpp" 38 #include "jfr/jfrEvents.hpp" 39 #include "memory/resourceArea.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "runtime/sharedRuntime.hpp" 42 #include "runtime/compilationPolicy.hpp" 43 #include "runtime/vm_version.hpp" 44 #include "utilities/bitMap.inline.hpp" 45 46 class BlockListBuilder { 47 private: 48 Compilation* _compilation; 49 IRScope* _scope; 50 51 BlockList _blocks; // internal list of all blocks 52 BlockList* _bci2block; // mapping from bci to blocks for GraphBuilder 53 54 // fields used by mark_loops 55 ResourceBitMap _active; // for iteration of control flow graph 56 ResourceBitMap _visited; // for iteration of control flow graph 57 intArray _loop_map; // caches the information if a block is contained in a loop 58 int _next_loop_index; // next free loop number 59 int _next_block_number; // for reverse postorder numbering of blocks 60 61 // accessors 62 Compilation* compilation() const { return _compilation; } 63 IRScope* scope() const { return _scope; } 64 ciMethod* method() const { return scope()->method(); } 65 XHandlers* xhandlers() const { return scope()->xhandlers(); } 66 67 // unified bailout support 68 void bailout(const char* msg) const { compilation()->bailout(msg); } 69 bool bailed_out() const { return compilation()->bailed_out(); } 70 71 // helper functions 72 BlockBegin* make_block_at(int bci, BlockBegin* predecessor); 73 void handle_exceptions(BlockBegin* current, int cur_bci); 74 void handle_jsr(BlockBegin* current, int sr_bci, int next_bci); 75 void store_one(BlockBegin* current, int local); 76 void store_two(BlockBegin* current, int local); 77 void set_entries(int osr_bci); 78 void set_leaders(); 79 80 void make_loop_header(BlockBegin* block); 81 void mark_loops(); 82 int mark_loops(BlockBegin* b, bool in_subroutine); 83 84 // debugging 85 #ifndef PRODUCT 86 void print(); 87 #endif 88 89 public: 90 // creation 91 BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci); 92 93 // accessors for GraphBuilder 94 BlockList* bci2block() const { return _bci2block; } 95 }; 96 97 98 // Implementation of BlockListBuilder 99 100 BlockListBuilder::BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci) 101 : _compilation(compilation) 102 , _scope(scope) 103 , _blocks(16) 104 , _bci2block(new BlockList(scope->method()->code_size(), NULL)) 105 , _active() // size not known yet 106 , _visited() // size not known yet 107 , _loop_map() // size not known yet 108 , _next_loop_index(0) 109 , _next_block_number(0) 110 { 111 set_entries(osr_bci); 112 set_leaders(); 113 CHECK_BAILOUT(); 114 115 mark_loops(); 116 NOT_PRODUCT(if (PrintInitialBlockList) print()); 117 118 #ifndef PRODUCT 119 if (PrintCFGToFile) { 120 stringStream title; 121 title.print("BlockListBuilder "); 122 scope->method()->print_name(&title); 123 CFGPrinter::print_cfg(_bci2block, title.as_string(), false, false); 124 } 125 #endif 126 } 127 128 129 void BlockListBuilder::set_entries(int osr_bci) { 130 // generate start blocks 131 BlockBegin* std_entry = make_block_at(0, NULL); 132 if (scope()->caller() == NULL) { 133 std_entry->set(BlockBegin::std_entry_flag); 134 } 135 if (osr_bci != -1) { 136 BlockBegin* osr_entry = make_block_at(osr_bci, NULL); 137 osr_entry->set(BlockBegin::osr_entry_flag); 138 } 139 140 // generate exception entry blocks 141 XHandlers* list = xhandlers(); 142 const int n = list->length(); 143 for (int i = 0; i < n; i++) { 144 XHandler* h = list->handler_at(i); 145 BlockBegin* entry = make_block_at(h->handler_bci(), NULL); 146 entry->set(BlockBegin::exception_entry_flag); 147 h->set_entry_block(entry); 148 } 149 } 150 151 152 BlockBegin* BlockListBuilder::make_block_at(int cur_bci, BlockBegin* predecessor) { 153 assert(method()->bci_block_start().at(cur_bci), "wrong block starts of MethodLivenessAnalyzer"); 154 155 BlockBegin* block = _bci2block->at(cur_bci); 156 if (block == NULL) { 157 block = new BlockBegin(cur_bci); 158 block->init_stores_to_locals(method()->max_locals()); 159 _bci2block->at_put(cur_bci, block); 160 _blocks.append(block); 161 162 assert(predecessor == NULL || predecessor->bci() < cur_bci, "targets for backward branches must already exist"); 163 } 164 165 if (predecessor != NULL) { 166 if (block->is_set(BlockBegin::exception_entry_flag)) { 167 BAILOUT_("Exception handler can be reached by both normal and exceptional control flow", block); 168 } 169 170 predecessor->add_successor(block); 171 block->increment_total_preds(); 172 } 173 174 return block; 175 } 176 177 178 inline void BlockListBuilder::store_one(BlockBegin* current, int local) { 179 current->stores_to_locals().set_bit(local); 180 } 181 inline void BlockListBuilder::store_two(BlockBegin* current, int local) { 182 store_one(current, local); 183 store_one(current, local + 1); 184 } 185 186 187 void BlockListBuilder::handle_exceptions(BlockBegin* current, int cur_bci) { 188 // Draws edges from a block to its exception handlers 189 XHandlers* list = xhandlers(); 190 const int n = list->length(); 191 192 for (int i = 0; i < n; i++) { 193 XHandler* h = list->handler_at(i); 194 195 if (h->covers(cur_bci)) { 196 BlockBegin* entry = h->entry_block(); 197 assert(entry != NULL && entry == _bci2block->at(h->handler_bci()), "entry must be set"); 198 assert(entry->is_set(BlockBegin::exception_entry_flag), "flag must be set"); 199 200 // add each exception handler only once 201 if (!current->is_successor(entry)) { 202 current->add_successor(entry); 203 entry->increment_total_preds(); 204 } 205 206 // stop when reaching catchall 207 if (h->catch_type() == 0) break; 208 } 209 } 210 } 211 212 void BlockListBuilder::handle_jsr(BlockBegin* current, int sr_bci, int next_bci) { 213 // start a new block after jsr-bytecode and link this block into cfg 214 make_block_at(next_bci, current); 215 216 // start a new block at the subroutine entry at mark it with special flag 217 BlockBegin* sr_block = make_block_at(sr_bci, current); 218 if (!sr_block->is_set(BlockBegin::subroutine_entry_flag)) { 219 sr_block->set(BlockBegin::subroutine_entry_flag); 220 } 221 } 222 223 224 void BlockListBuilder::set_leaders() { 225 bool has_xhandlers = xhandlers()->has_handlers(); 226 BlockBegin* current = NULL; 227 228 // The information which bci starts a new block simplifies the analysis 229 // Without it, backward branches could jump to a bci where no block was created 230 // during bytecode iteration. This would require the creation of a new block at the 231 // branch target and a modification of the successor lists. 232 const BitMap& bci_block_start = method()->bci_block_start(); 233 234 ciBytecodeStream s(method()); 235 while (s.next() != ciBytecodeStream::EOBC()) { 236 int cur_bci = s.cur_bci(); 237 238 if (bci_block_start.at(cur_bci)) { 239 current = make_block_at(cur_bci, current); 240 } 241 assert(current != NULL, "must have current block"); 242 243 if (has_xhandlers && GraphBuilder::can_trap(method(), s.cur_bc())) { 244 handle_exceptions(current, cur_bci); 245 } 246 247 switch (s.cur_bc()) { 248 // track stores to local variables for selective creation of phi functions 249 case Bytecodes::_iinc: store_one(current, s.get_index()); break; 250 case Bytecodes::_istore: store_one(current, s.get_index()); break; 251 case Bytecodes::_lstore: store_two(current, s.get_index()); break; 252 case Bytecodes::_fstore: store_one(current, s.get_index()); break; 253 case Bytecodes::_dstore: store_two(current, s.get_index()); break; 254 case Bytecodes::_astore: store_one(current, s.get_index()); break; 255 case Bytecodes::_istore_0: store_one(current, 0); break; 256 case Bytecodes::_istore_1: store_one(current, 1); break; 257 case Bytecodes::_istore_2: store_one(current, 2); break; 258 case Bytecodes::_istore_3: store_one(current, 3); break; 259 case Bytecodes::_lstore_0: store_two(current, 0); break; 260 case Bytecodes::_lstore_1: store_two(current, 1); break; 261 case Bytecodes::_lstore_2: store_two(current, 2); break; 262 case Bytecodes::_lstore_3: store_two(current, 3); break; 263 case Bytecodes::_fstore_0: store_one(current, 0); break; 264 case Bytecodes::_fstore_1: store_one(current, 1); break; 265 case Bytecodes::_fstore_2: store_one(current, 2); break; 266 case Bytecodes::_fstore_3: store_one(current, 3); break; 267 case Bytecodes::_dstore_0: store_two(current, 0); break; 268 case Bytecodes::_dstore_1: store_two(current, 1); break; 269 case Bytecodes::_dstore_2: store_two(current, 2); break; 270 case Bytecodes::_dstore_3: store_two(current, 3); break; 271 case Bytecodes::_astore_0: store_one(current, 0); break; 272 case Bytecodes::_astore_1: store_one(current, 1); break; 273 case Bytecodes::_astore_2: store_one(current, 2); break; 274 case Bytecodes::_astore_3: store_one(current, 3); break; 275 276 // track bytecodes that affect the control flow 277 case Bytecodes::_athrow: // fall through 278 case Bytecodes::_ret: // fall through 279 case Bytecodes::_ireturn: // fall through 280 case Bytecodes::_lreturn: // fall through 281 case Bytecodes::_freturn: // fall through 282 case Bytecodes::_dreturn: // fall through 283 case Bytecodes::_areturn: // fall through 284 case Bytecodes::_return: 285 current = NULL; 286 break; 287 288 case Bytecodes::_ifeq: // fall through 289 case Bytecodes::_ifne: // fall through 290 case Bytecodes::_iflt: // fall through 291 case Bytecodes::_ifge: // fall through 292 case Bytecodes::_ifgt: // fall through 293 case Bytecodes::_ifle: // fall through 294 case Bytecodes::_if_icmpeq: // fall through 295 case Bytecodes::_if_icmpne: // fall through 296 case Bytecodes::_if_icmplt: // fall through 297 case Bytecodes::_if_icmpge: // fall through 298 case Bytecodes::_if_icmpgt: // fall through 299 case Bytecodes::_if_icmple: // fall through 300 case Bytecodes::_if_acmpeq: // fall through 301 case Bytecodes::_if_acmpne: // fall through 302 case Bytecodes::_ifnull: // fall through 303 case Bytecodes::_ifnonnull: 304 make_block_at(s.next_bci(), current); 305 make_block_at(s.get_dest(), current); 306 current = NULL; 307 break; 308 309 case Bytecodes::_goto: 310 make_block_at(s.get_dest(), current); 311 current = NULL; 312 break; 313 314 case Bytecodes::_goto_w: 315 make_block_at(s.get_far_dest(), current); 316 current = NULL; 317 break; 318 319 case Bytecodes::_jsr: 320 handle_jsr(current, s.get_dest(), s.next_bci()); 321 current = NULL; 322 break; 323 324 case Bytecodes::_jsr_w: 325 handle_jsr(current, s.get_far_dest(), s.next_bci()); 326 current = NULL; 327 break; 328 329 case Bytecodes::_tableswitch: { 330 // set block for each case 331 Bytecode_tableswitch sw(&s); 332 int l = sw.length(); 333 for (int i = 0; i < l; i++) { 334 make_block_at(cur_bci + sw.dest_offset_at(i), current); 335 } 336 make_block_at(cur_bci + sw.default_offset(), current); 337 current = NULL; 338 break; 339 } 340 341 case Bytecodes::_lookupswitch: { 342 // set block for each case 343 Bytecode_lookupswitch sw(&s); 344 int l = sw.number_of_pairs(); 345 for (int i = 0; i < l; i++) { 346 make_block_at(cur_bci + sw.pair_at(i).offset(), current); 347 } 348 make_block_at(cur_bci + sw.default_offset(), current); 349 current = NULL; 350 break; 351 } 352 353 default: 354 break; 355 } 356 } 357 } 358 359 360 void BlockListBuilder::mark_loops() { 361 ResourceMark rm; 362 363 _active.initialize(BlockBegin::number_of_blocks()); 364 _visited.initialize(BlockBegin::number_of_blocks()); 365 _loop_map = intArray(BlockBegin::number_of_blocks(), BlockBegin::number_of_blocks(), 0); 366 _next_loop_index = 0; 367 _next_block_number = _blocks.length(); 368 369 // recursively iterate the control flow graph 370 mark_loops(_bci2block->at(0), false); 371 assert(_next_block_number >= 0, "invalid block numbers"); 372 373 // Remove dangling Resource pointers before the ResourceMark goes out-of-scope. 374 _active.resize(0); 375 _visited.resize(0); 376 } 377 378 void BlockListBuilder::make_loop_header(BlockBegin* block) { 379 if (block->is_set(BlockBegin::exception_entry_flag)) { 380 // exception edges may look like loops but don't mark them as such 381 // since it screws up block ordering. 382 return; 383 } 384 if (!block->is_set(BlockBegin::parser_loop_header_flag)) { 385 block->set(BlockBegin::parser_loop_header_flag); 386 387 assert(_loop_map.at(block->block_id()) == 0, "must not be set yet"); 388 assert(0 <= _next_loop_index && _next_loop_index < BitsPerInt, "_next_loop_index is used as a bit-index in integer"); 389 _loop_map.at_put(block->block_id(), 1 << _next_loop_index); 390 if (_next_loop_index < 31) _next_loop_index++; 391 } else { 392 // block already marked as loop header 393 assert(is_power_of_2((unsigned int)_loop_map.at(block->block_id())), "exactly one bit must be set"); 394 } 395 } 396 397 int BlockListBuilder::mark_loops(BlockBegin* block, bool in_subroutine) { 398 int block_id = block->block_id(); 399 400 if (_visited.at(block_id)) { 401 if (_active.at(block_id)) { 402 // reached block via backward branch 403 make_loop_header(block); 404 } 405 // return cached loop information for this block 406 return _loop_map.at(block_id); 407 } 408 409 if (block->is_set(BlockBegin::subroutine_entry_flag)) { 410 in_subroutine = true; 411 } 412 413 // set active and visited bits before successors are processed 414 _visited.set_bit(block_id); 415 _active.set_bit(block_id); 416 417 intptr_t loop_state = 0; 418 for (int i = block->number_of_sux() - 1; i >= 0; i--) { 419 // recursively process all successors 420 loop_state |= mark_loops(block->sux_at(i), in_subroutine); 421 } 422 423 // clear active-bit after all successors are processed 424 _active.clear_bit(block_id); 425 426 // reverse-post-order numbering of all blocks 427 block->set_depth_first_number(_next_block_number); 428 _next_block_number--; 429 430 if (loop_state != 0 || in_subroutine ) { 431 // block is contained at least in one loop, so phi functions are necessary 432 // phi functions are also necessary for all locals stored in a subroutine 433 scope()->requires_phi_function().set_union(block->stores_to_locals()); 434 } 435 436 if (block->is_set(BlockBegin::parser_loop_header_flag)) { 437 int header_loop_state = _loop_map.at(block_id); 438 assert(is_power_of_2((unsigned)header_loop_state), "exactly one bit must be set"); 439 440 // If the highest bit is set (i.e. when integer value is negative), the method 441 // has 32 or more loops. This bit is never cleared because it is used for multiple loops 442 if (header_loop_state >= 0) { 443 clear_bits(loop_state, header_loop_state); 444 } 445 } 446 447 // cache and return loop information for this block 448 _loop_map.at_put(block_id, loop_state); 449 return loop_state; 450 } 451 452 453 #ifndef PRODUCT 454 455 int compare_depth_first(BlockBegin** a, BlockBegin** b) { 456 return (*a)->depth_first_number() - (*b)->depth_first_number(); 457 } 458 459 void BlockListBuilder::print() { 460 tty->print("----- initial block list of BlockListBuilder for method "); 461 method()->print_short_name(); 462 tty->cr(); 463 464 // better readability if blocks are sorted in processing order 465 _blocks.sort(compare_depth_first); 466 467 for (int i = 0; i < _blocks.length(); i++) { 468 BlockBegin* cur = _blocks.at(i); 469 tty->print("%4d: B%-4d bci: %-4d preds: %-4d ", cur->depth_first_number(), cur->block_id(), cur->bci(), cur->total_preds()); 470 471 tty->print(cur->is_set(BlockBegin::std_entry_flag) ? " std" : " "); 472 tty->print(cur->is_set(BlockBegin::osr_entry_flag) ? " osr" : " "); 473 tty->print(cur->is_set(BlockBegin::exception_entry_flag) ? " ex" : " "); 474 tty->print(cur->is_set(BlockBegin::subroutine_entry_flag) ? " sr" : " "); 475 tty->print(cur->is_set(BlockBegin::parser_loop_header_flag) ? " lh" : " "); 476 477 if (cur->number_of_sux() > 0) { 478 tty->print(" sux: "); 479 for (int j = 0; j < cur->number_of_sux(); j++) { 480 BlockBegin* sux = cur->sux_at(j); 481 tty->print("B%d ", sux->block_id()); 482 } 483 } 484 tty->cr(); 485 } 486 } 487 488 #endif 489 490 491 // A simple growable array of Values indexed by ciFields 492 class FieldBuffer: public CompilationResourceObj { 493 private: 494 GrowableArray<Value> _values; 495 496 public: 497 FieldBuffer() {} 498 499 void kill() { 500 _values.trunc_to(0); 501 } 502 503 Value at(ciField* field) { 504 assert(field->holder()->is_loaded(), "must be a loaded field"); 505 int offset = field->offset(); 506 if (offset < _values.length()) { 507 return _values.at(offset); 508 } else { 509 return NULL; 510 } 511 } 512 513 void at_put(ciField* field, Value value) { 514 assert(field->holder()->is_loaded(), "must be a loaded field"); 515 int offset = field->offset(); 516 _values.at_put_grow(offset, value, NULL); 517 } 518 519 }; 520 521 522 // MemoryBuffer is fairly simple model of the current state of memory. 523 // It partitions memory into several pieces. The first piece is 524 // generic memory where little is known about the owner of the memory. 525 // This is conceptually represented by the tuple <O, F, V> which says 526 // that the field F of object O has value V. This is flattened so 527 // that F is represented by the offset of the field and the parallel 528 // arrays _objects and _values are used for O and V. Loads of O.F can 529 // simply use V. Newly allocated objects are kept in a separate list 530 // along with a parallel array for each object which represents the 531 // current value of its fields. Stores of the default value to fields 532 // which have never been stored to before are eliminated since they 533 // are redundant. Once newly allocated objects are stored into 534 // another object or they are passed out of the current compile they 535 // are treated like generic memory. 536 537 class MemoryBuffer: public CompilationResourceObj { 538 private: 539 FieldBuffer _values; 540 GrowableArray<Value> _objects; 541 GrowableArray<Value> _newobjects; 542 GrowableArray<FieldBuffer*> _fields; 543 544 public: 545 MemoryBuffer() {} 546 547 StoreField* store(StoreField* st) { 548 if (!EliminateFieldAccess) { 549 return st; 550 } 551 552 Value object = st->obj(); 553 Value value = st->value(); 554 ciField* field = st->field(); 555 if (field->holder()->is_loaded()) { 556 int offset = field->offset(); 557 int index = _newobjects.find(object); 558 if (index != -1) { 559 // newly allocated object with no other stores performed on this field 560 FieldBuffer* buf = _fields.at(index); 561 if (buf->at(field) == NULL && is_default_value(value)) { 562 #ifndef PRODUCT 563 if (PrintIRDuringConstruction && Verbose) { 564 tty->print_cr("Eliminated store for object %d:", index); 565 st->print_line(); 566 } 567 #endif 568 return NULL; 569 } else { 570 buf->at_put(field, value); 571 } 572 } else { 573 _objects.at_put_grow(offset, object, NULL); 574 _values.at_put(field, value); 575 } 576 577 store_value(value); 578 } else { 579 // if we held onto field names we could alias based on names but 580 // we don't know what's being stored to so kill it all. 581 kill(); 582 } 583 return st; 584 } 585 586 587 // return true if this value correspond to the default value of a field. 588 bool is_default_value(Value value) { 589 Constant* con = value->as_Constant(); 590 if (con) { 591 switch (con->type()->tag()) { 592 case intTag: return con->type()->as_IntConstant()->value() == 0; 593 case longTag: return con->type()->as_LongConstant()->value() == 0; 594 case floatTag: return jint_cast(con->type()->as_FloatConstant()->value()) == 0; 595 case doubleTag: return jlong_cast(con->type()->as_DoubleConstant()->value()) == jlong_cast(0); 596 case objectTag: return con->type() == objectNull; 597 default: ShouldNotReachHere(); 598 } 599 } 600 return false; 601 } 602 603 604 // return either the actual value of a load or the load itself 605 Value load(LoadField* load) { 606 if (!EliminateFieldAccess) { 607 return load; 608 } 609 610 if (RoundFPResults && UseSSE < 2 && load->type()->is_float_kind()) { 611 // can't skip load since value might get rounded as a side effect 612 return load; 613 } 614 615 ciField* field = load->field(); 616 Value object = load->obj(); 617 if (field->holder()->is_loaded() && !field->is_volatile()) { 618 int offset = field->offset(); 619 Value result = NULL; 620 int index = _newobjects.find(object); 621 if (index != -1) { 622 result = _fields.at(index)->at(field); 623 } else if (_objects.at_grow(offset, NULL) == object) { 624 result = _values.at(field); 625 } 626 if (result != NULL) { 627 #ifndef PRODUCT 628 if (PrintIRDuringConstruction && Verbose) { 629 tty->print_cr("Eliminated load: "); 630 load->print_line(); 631 } 632 #endif 633 assert(result->type()->tag() == load->type()->tag(), "wrong types"); 634 return result; 635 } 636 } 637 return load; 638 } 639 640 // Record this newly allocated object 641 void new_instance(NewInstance* object) { 642 int index = _newobjects.length(); 643 _newobjects.append(object); 644 if (_fields.at_grow(index, NULL) == NULL) { 645 _fields.at_put(index, new FieldBuffer()); 646 } else { 647 _fields.at(index)->kill(); 648 } 649 } 650 651 void store_value(Value value) { 652 int index = _newobjects.find(value); 653 if (index != -1) { 654 // stored a newly allocated object into another object. 655 // Assume we've lost track of it as separate slice of memory. 656 // We could do better by keeping track of whether individual 657 // fields could alias each other. 658 _newobjects.remove_at(index); 659 // pull out the field info and store it at the end up the list 660 // of field info list to be reused later. 661 _fields.append(_fields.at(index)); 662 _fields.remove_at(index); 663 } 664 } 665 666 void kill() { 667 _newobjects.trunc_to(0); 668 _objects.trunc_to(0); 669 _values.kill(); 670 } 671 }; 672 673 674 // Implementation of GraphBuilder's ScopeData 675 676 GraphBuilder::ScopeData::ScopeData(ScopeData* parent) 677 : _parent(parent) 678 , _bci2block(NULL) 679 , _scope(NULL) 680 , _has_handler(false) 681 , _stream(NULL) 682 , _work_list(NULL) 683 , _caller_stack_size(-1) 684 , _continuation(NULL) 685 , _parsing_jsr(false) 686 , _jsr_xhandlers(NULL) 687 , _num_returns(0) 688 , _cleanup_block(NULL) 689 , _cleanup_return_prev(NULL) 690 , _cleanup_state(NULL) 691 , _ignore_return(false) 692 { 693 if (parent != NULL) { 694 _max_inline_size = (intx) ((float) NestedInliningSizeRatio * (float) parent->max_inline_size() / 100.0f); 695 } else { 696 _max_inline_size = MaxInlineSize; 697 } 698 if (_max_inline_size < MaxTrivialSize) { 699 _max_inline_size = MaxTrivialSize; 700 } 701 } 702 703 704 void GraphBuilder::kill_all() { 705 if (UseLocalValueNumbering) { 706 vmap()->kill_all(); 707 } 708 _memory->kill(); 709 } 710 711 712 BlockBegin* GraphBuilder::ScopeData::block_at(int bci) { 713 if (parsing_jsr()) { 714 // It is necessary to clone all blocks associated with a 715 // subroutine, including those for exception handlers in the scope 716 // of the method containing the jsr (because those exception 717 // handlers may contain ret instructions in some cases). 718 BlockBegin* block = bci2block()->at(bci); 719 if (block != NULL && block == parent()->bci2block()->at(bci)) { 720 BlockBegin* new_block = new BlockBegin(block->bci()); 721 if (PrintInitialBlockList) { 722 tty->print_cr("CFG: cloned block %d (bci %d) as block %d for jsr", 723 block->block_id(), block->bci(), new_block->block_id()); 724 } 725 // copy data from cloned blocked 726 new_block->set_depth_first_number(block->depth_first_number()); 727 if (block->is_set(BlockBegin::parser_loop_header_flag)) new_block->set(BlockBegin::parser_loop_header_flag); 728 // Preserve certain flags for assertion checking 729 if (block->is_set(BlockBegin::subroutine_entry_flag)) new_block->set(BlockBegin::subroutine_entry_flag); 730 if (block->is_set(BlockBegin::exception_entry_flag)) new_block->set(BlockBegin::exception_entry_flag); 731 732 // copy was_visited_flag to allow early detection of bailouts 733 // if a block that is used in a jsr has already been visited before, 734 // it is shared between the normal control flow and a subroutine 735 // BlockBegin::try_merge returns false when the flag is set, this leads 736 // to a compilation bailout 737 if (block->is_set(BlockBegin::was_visited_flag)) new_block->set(BlockBegin::was_visited_flag); 738 739 bci2block()->at_put(bci, new_block); 740 block = new_block; 741 } 742 return block; 743 } else { 744 return bci2block()->at(bci); 745 } 746 } 747 748 749 XHandlers* GraphBuilder::ScopeData::xhandlers() const { 750 if (_jsr_xhandlers == NULL) { 751 assert(!parsing_jsr(), ""); 752 return scope()->xhandlers(); 753 } 754 assert(parsing_jsr(), ""); 755 return _jsr_xhandlers; 756 } 757 758 759 void GraphBuilder::ScopeData::set_scope(IRScope* scope) { 760 _scope = scope; 761 bool parent_has_handler = false; 762 if (parent() != NULL) { 763 parent_has_handler = parent()->has_handler(); 764 } 765 _has_handler = parent_has_handler || scope->xhandlers()->has_handlers(); 766 } 767 768 769 void GraphBuilder::ScopeData::set_inline_cleanup_info(BlockBegin* block, 770 Instruction* return_prev, 771 ValueStack* return_state) { 772 _cleanup_block = block; 773 _cleanup_return_prev = return_prev; 774 _cleanup_state = return_state; 775 } 776 777 778 void GraphBuilder::ScopeData::add_to_work_list(BlockBegin* block) { 779 if (_work_list == NULL) { 780 _work_list = new BlockList(); 781 } 782 783 if (!block->is_set(BlockBegin::is_on_work_list_flag)) { 784 // Do not start parsing the continuation block while in a 785 // sub-scope 786 if (parsing_jsr()) { 787 if (block == jsr_continuation()) { 788 return; 789 } 790 } else { 791 if (block == continuation()) { 792 return; 793 } 794 } 795 block->set(BlockBegin::is_on_work_list_flag); 796 _work_list->push(block); 797 798 sort_top_into_worklist(_work_list, block); 799 } 800 } 801 802 803 void GraphBuilder::sort_top_into_worklist(BlockList* worklist, BlockBegin* top) { 804 assert(worklist->top() == top, ""); 805 // sort block descending into work list 806 const int dfn = top->depth_first_number(); 807 assert(dfn != -1, "unknown depth first number"); 808 int i = worklist->length()-2; 809 while (i >= 0) { 810 BlockBegin* b = worklist->at(i); 811 if (b->depth_first_number() < dfn) { 812 worklist->at_put(i+1, b); 813 } else { 814 break; 815 } 816 i --; 817 } 818 if (i >= -1) worklist->at_put(i + 1, top); 819 } 820 821 822 BlockBegin* GraphBuilder::ScopeData::remove_from_work_list() { 823 if (is_work_list_empty()) { 824 return NULL; 825 } 826 return _work_list->pop(); 827 } 828 829 830 bool GraphBuilder::ScopeData::is_work_list_empty() const { 831 return (_work_list == NULL || _work_list->length() == 0); 832 } 833 834 835 void GraphBuilder::ScopeData::setup_jsr_xhandlers() { 836 assert(parsing_jsr(), ""); 837 // clone all the exception handlers from the scope 838 XHandlers* handlers = new XHandlers(scope()->xhandlers()); 839 const int n = handlers->length(); 840 for (int i = 0; i < n; i++) { 841 // The XHandlers need to be adjusted to dispatch to the cloned 842 // handler block instead of the default one but the synthetic 843 // unlocker needs to be handled specially. The synthetic unlocker 844 // should be left alone since there can be only one and all code 845 // should dispatch to the same one. 846 XHandler* h = handlers->handler_at(i); 847 assert(h->handler_bci() != SynchronizationEntryBCI, "must be real"); 848 h->set_entry_block(block_at(h->handler_bci())); 849 } 850 _jsr_xhandlers = handlers; 851 } 852 853 854 int GraphBuilder::ScopeData::num_returns() { 855 if (parsing_jsr()) { 856 return parent()->num_returns(); 857 } 858 return _num_returns; 859 } 860 861 862 void GraphBuilder::ScopeData::incr_num_returns() { 863 if (parsing_jsr()) { 864 parent()->incr_num_returns(); 865 } else { 866 ++_num_returns; 867 } 868 } 869 870 871 // Implementation of GraphBuilder 872 873 #define INLINE_BAILOUT(msg) { inline_bailout(msg); return false; } 874 875 876 void GraphBuilder::load_constant() { 877 ciConstant con = stream()->get_constant(); 878 if (con.basic_type() == T_ILLEGAL) { 879 // FIXME: an unresolved Dynamic constant can get here, 880 // and that should not terminate the whole compilation. 881 BAILOUT("could not resolve a constant"); 882 } else { 883 ValueType* t = illegalType; 884 ValueStack* patch_state = NULL; 885 switch (con.basic_type()) { 886 case T_BOOLEAN: t = new IntConstant (con.as_boolean()); break; 887 case T_BYTE : t = new IntConstant (con.as_byte ()); break; 888 case T_CHAR : t = new IntConstant (con.as_char ()); break; 889 case T_SHORT : t = new IntConstant (con.as_short ()); break; 890 case T_INT : t = new IntConstant (con.as_int ()); break; 891 case T_LONG : t = new LongConstant (con.as_long ()); break; 892 case T_FLOAT : t = new FloatConstant (con.as_float ()); break; 893 case T_DOUBLE : t = new DoubleConstant (con.as_double ()); break; 894 case T_ARRAY : t = new ArrayConstant (con.as_object ()->as_array ()); break; 895 case T_OBJECT : 896 { 897 ciObject* obj = con.as_object(); 898 if (!obj->is_loaded() 899 || (PatchALot && obj->klass() != ciEnv::current()->String_klass())) { 900 // A Class, MethodType, MethodHandle, or String. 901 // Unloaded condy nodes show up as T_ILLEGAL, above. 902 patch_state = copy_state_before(); 903 t = new ObjectConstant(obj); 904 } else { 905 // Might be a Class, MethodType, MethodHandle, or Dynamic constant 906 // result, which might turn out to be an array. 907 if (obj->is_null_object()) 908 t = objectNull; 909 else if (obj->is_array()) 910 t = new ArrayConstant(obj->as_array()); 911 else 912 t = new InstanceConstant(obj->as_instance()); 913 } 914 break; 915 } 916 default : ShouldNotReachHere(); 917 } 918 Value x; 919 if (patch_state != NULL) { 920 x = new Constant(t, patch_state); 921 } else { 922 x = new Constant(t); 923 } 924 push(t, append(x)); 925 } 926 } 927 928 929 void GraphBuilder::load_local(ValueType* type, int index) { 930 Value x = state()->local_at(index); 931 assert(x != NULL && !x->type()->is_illegal(), "access of illegal local variable"); 932 push(type, x); 933 } 934 935 936 void GraphBuilder::store_local(ValueType* type, int index) { 937 Value x = pop(type); 938 store_local(state(), x, index); 939 } 940 941 942 void GraphBuilder::store_local(ValueStack* state, Value x, int index) { 943 if (parsing_jsr()) { 944 // We need to do additional tracking of the location of the return 945 // address for jsrs since we don't handle arbitrary jsr/ret 946 // constructs. Here we are figuring out in which circumstances we 947 // need to bail out. 948 if (x->type()->is_address()) { 949 scope_data()->set_jsr_return_address_local(index); 950 951 // Also check parent jsrs (if any) at this time to see whether 952 // they are using this local. We don't handle skipping over a 953 // ret. 954 for (ScopeData* cur_scope_data = scope_data()->parent(); 955 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope(); 956 cur_scope_data = cur_scope_data->parent()) { 957 if (cur_scope_data->jsr_return_address_local() == index) { 958 BAILOUT("subroutine overwrites return address from previous subroutine"); 959 } 960 } 961 } else if (index == scope_data()->jsr_return_address_local()) { 962 scope_data()->set_jsr_return_address_local(-1); 963 } 964 } 965 966 state->store_local(index, round_fp(x)); 967 } 968 969 970 void GraphBuilder::load_indexed(BasicType type) { 971 // In case of in block code motion in range check elimination 972 ValueStack* state_before = copy_state_indexed_access(); 973 compilation()->set_has_access_indexed(true); 974 Value index = ipop(); 975 Value array = apop(); 976 Value length = NULL; 977 if (CSEArrayLength || 978 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) || 979 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) { 980 length = append(new ArrayLength(array, state_before)); 981 } 982 push(as_ValueType(type), append(new LoadIndexed(array, index, length, type, state_before))); 983 } 984 985 986 void GraphBuilder::store_indexed(BasicType type) { 987 // In case of in block code motion in range check elimination 988 ValueStack* state_before = copy_state_indexed_access(); 989 compilation()->set_has_access_indexed(true); 990 Value value = pop(as_ValueType(type)); 991 Value index = ipop(); 992 Value array = apop(); 993 Value length = NULL; 994 if (CSEArrayLength || 995 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) || 996 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) { 997 length = append(new ArrayLength(array, state_before)); 998 } 999 ciType* array_type = array->declared_type(); 1000 bool check_boolean = false; 1001 if (array_type != NULL) { 1002 if (array_type->is_loaded() && 1003 array_type->as_array_klass()->element_type()->basic_type() == T_BOOLEAN) { 1004 assert(type == T_BYTE, "boolean store uses bastore"); 1005 Value mask = append(new Constant(new IntConstant(1))); 1006 value = append(new LogicOp(Bytecodes::_iand, value, mask)); 1007 } 1008 } else if (type == T_BYTE) { 1009 check_boolean = true; 1010 } 1011 StoreIndexed* result = new StoreIndexed(array, index, length, type, value, state_before, check_boolean); 1012 append(result); 1013 _memory->store_value(value); 1014 1015 if (type == T_OBJECT && is_profiling()) { 1016 // Note that we'd collect profile data in this method if we wanted it. 1017 compilation()->set_would_profile(true); 1018 1019 if (profile_checkcasts()) { 1020 result->set_profiled_method(method()); 1021 result->set_profiled_bci(bci()); 1022 result->set_should_profile(true); 1023 } 1024 } 1025 } 1026 1027 1028 void GraphBuilder::stack_op(Bytecodes::Code code) { 1029 switch (code) { 1030 case Bytecodes::_pop: 1031 { state()->raw_pop(); 1032 } 1033 break; 1034 case Bytecodes::_pop2: 1035 { state()->raw_pop(); 1036 state()->raw_pop(); 1037 } 1038 break; 1039 case Bytecodes::_dup: 1040 { Value w = state()->raw_pop(); 1041 state()->raw_push(w); 1042 state()->raw_push(w); 1043 } 1044 break; 1045 case Bytecodes::_dup_x1: 1046 { Value w1 = state()->raw_pop(); 1047 Value w2 = state()->raw_pop(); 1048 state()->raw_push(w1); 1049 state()->raw_push(w2); 1050 state()->raw_push(w1); 1051 } 1052 break; 1053 case Bytecodes::_dup_x2: 1054 { Value w1 = state()->raw_pop(); 1055 Value w2 = state()->raw_pop(); 1056 Value w3 = state()->raw_pop(); 1057 state()->raw_push(w1); 1058 state()->raw_push(w3); 1059 state()->raw_push(w2); 1060 state()->raw_push(w1); 1061 } 1062 break; 1063 case Bytecodes::_dup2: 1064 { Value w1 = state()->raw_pop(); 1065 Value w2 = state()->raw_pop(); 1066 state()->raw_push(w2); 1067 state()->raw_push(w1); 1068 state()->raw_push(w2); 1069 state()->raw_push(w1); 1070 } 1071 break; 1072 case Bytecodes::_dup2_x1: 1073 { Value w1 = state()->raw_pop(); 1074 Value w2 = state()->raw_pop(); 1075 Value w3 = state()->raw_pop(); 1076 state()->raw_push(w2); 1077 state()->raw_push(w1); 1078 state()->raw_push(w3); 1079 state()->raw_push(w2); 1080 state()->raw_push(w1); 1081 } 1082 break; 1083 case Bytecodes::_dup2_x2: 1084 { Value w1 = state()->raw_pop(); 1085 Value w2 = state()->raw_pop(); 1086 Value w3 = state()->raw_pop(); 1087 Value w4 = state()->raw_pop(); 1088 state()->raw_push(w2); 1089 state()->raw_push(w1); 1090 state()->raw_push(w4); 1091 state()->raw_push(w3); 1092 state()->raw_push(w2); 1093 state()->raw_push(w1); 1094 } 1095 break; 1096 case Bytecodes::_swap: 1097 { Value w1 = state()->raw_pop(); 1098 Value w2 = state()->raw_pop(); 1099 state()->raw_push(w1); 1100 state()->raw_push(w2); 1101 } 1102 break; 1103 default: 1104 ShouldNotReachHere(); 1105 break; 1106 } 1107 } 1108 1109 1110 void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) { 1111 Value y = pop(type); 1112 Value x = pop(type); 1113 // NOTE: strictfp can be queried from current method since we don't 1114 // inline methods with differing strictfp bits 1115 Value res = new ArithmeticOp(code, x, y, method()->is_strict(), state_before); 1116 // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level 1117 res = append(res); 1118 if (method()->is_strict()) { 1119 res = round_fp(res); 1120 } 1121 push(type, res); 1122 } 1123 1124 1125 void GraphBuilder::negate_op(ValueType* type) { 1126 push(type, append(new NegateOp(pop(type)))); 1127 } 1128 1129 1130 void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) { 1131 Value s = ipop(); 1132 Value x = pop(type); 1133 // try to simplify 1134 // Note: This code should go into the canonicalizer as soon as it can 1135 // can handle canonicalized forms that contain more than one node. 1136 if (CanonicalizeNodes && code == Bytecodes::_iushr) { 1137 // pattern: x >>> s 1138 IntConstant* s1 = s->type()->as_IntConstant(); 1139 if (s1 != NULL) { 1140 // pattern: x >>> s1, with s1 constant 1141 ShiftOp* l = x->as_ShiftOp(); 1142 if (l != NULL && l->op() == Bytecodes::_ishl) { 1143 // pattern: (a << b) >>> s1 1144 IntConstant* s0 = l->y()->type()->as_IntConstant(); 1145 if (s0 != NULL) { 1146 // pattern: (a << s0) >>> s1 1147 const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts 1148 const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts 1149 if (s0c == s1c) { 1150 if (s0c == 0) { 1151 // pattern: (a << 0) >>> 0 => simplify to: a 1152 ipush(l->x()); 1153 } else { 1154 // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant 1155 assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases"); 1156 const int m = (1 << (BitsPerInt - s0c)) - 1; 1157 Value s = append(new Constant(new IntConstant(m))); 1158 ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s))); 1159 } 1160 return; 1161 } 1162 } 1163 } 1164 } 1165 } 1166 // could not simplify 1167 push(type, append(new ShiftOp(code, x, s))); 1168 } 1169 1170 1171 void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) { 1172 Value y = pop(type); 1173 Value x = pop(type); 1174 push(type, append(new LogicOp(code, x, y))); 1175 } 1176 1177 1178 void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) { 1179 ValueStack* state_before = copy_state_before(); 1180 Value y = pop(type); 1181 Value x = pop(type); 1182 ipush(append(new CompareOp(code, x, y, state_before))); 1183 } 1184 1185 1186 void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) { 1187 push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to)))); 1188 } 1189 1190 1191 void GraphBuilder::increment() { 1192 int index = stream()->get_index(); 1193 int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]); 1194 load_local(intType, index); 1195 ipush(append(new Constant(new IntConstant(delta)))); 1196 arithmetic_op(intType, Bytecodes::_iadd); 1197 store_local(intType, index); 1198 } 1199 1200 1201 void GraphBuilder::_goto(int from_bci, int to_bci) { 1202 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci); 1203 if (is_profiling()) { 1204 compilation()->set_would_profile(true); 1205 x->set_profiled_bci(bci()); 1206 if (profile_branches()) { 1207 x->set_profiled_method(method()); 1208 x->set_should_profile(true); 1209 } 1210 } 1211 append(x); 1212 } 1213 1214 1215 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) { 1216 BlockBegin* tsux = block_at(stream()->get_dest()); 1217 BlockBegin* fsux = block_at(stream()->next_bci()); 1218 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci(); 1219 // In case of loop invariant code motion or predicate insertion 1220 // before the body of a loop the state is needed 1221 Instruction *i = append(new If(x, cond, false, y, tsux, fsux, (is_bb || compilation()->is_optimistic()) ? state_before : NULL, is_bb)); 1222 1223 assert(i->as_Goto() == NULL || 1224 (i->as_Goto()->sux_at(0) == tsux && i->as_Goto()->is_safepoint() == tsux->bci() < stream()->cur_bci()) || 1225 (i->as_Goto()->sux_at(0) == fsux && i->as_Goto()->is_safepoint() == fsux->bci() < stream()->cur_bci()), 1226 "safepoint state of Goto returned by canonicalizer incorrect"); 1227 1228 if (is_profiling()) { 1229 If* if_node = i->as_If(); 1230 if (if_node != NULL) { 1231 // Note that we'd collect profile data in this method if we wanted it. 1232 compilation()->set_would_profile(true); 1233 // At level 2 we need the proper bci to count backedges 1234 if_node->set_profiled_bci(bci()); 1235 if (profile_branches()) { 1236 // Successors can be rotated by the canonicalizer, check for this case. 1237 if_node->set_profiled_method(method()); 1238 if_node->set_should_profile(true); 1239 if (if_node->tsux() == fsux) { 1240 if_node->set_swapped(true); 1241 } 1242 } 1243 return; 1244 } 1245 1246 // Check if this If was reduced to Goto. 1247 Goto *goto_node = i->as_Goto(); 1248 if (goto_node != NULL) { 1249 compilation()->set_would_profile(true); 1250 goto_node->set_profiled_bci(bci()); 1251 if (profile_branches()) { 1252 goto_node->set_profiled_method(method()); 1253 goto_node->set_should_profile(true); 1254 // Find out which successor is used. 1255 if (goto_node->default_sux() == tsux) { 1256 goto_node->set_direction(Goto::taken); 1257 } else if (goto_node->default_sux() == fsux) { 1258 goto_node->set_direction(Goto::not_taken); 1259 } else { 1260 ShouldNotReachHere(); 1261 } 1262 } 1263 return; 1264 } 1265 } 1266 } 1267 1268 1269 void GraphBuilder::if_zero(ValueType* type, If::Condition cond) { 1270 Value y = append(new Constant(intZero)); 1271 ValueStack* state_before = copy_state_before(); 1272 Value x = ipop(); 1273 if_node(x, cond, y, state_before); 1274 } 1275 1276 1277 void GraphBuilder::if_null(ValueType* type, If::Condition cond) { 1278 Value y = append(new Constant(objectNull)); 1279 ValueStack* state_before = copy_state_before(); 1280 Value x = apop(); 1281 if_node(x, cond, y, state_before); 1282 } 1283 1284 1285 void GraphBuilder::if_same(ValueType* type, If::Condition cond) { 1286 ValueStack* state_before = copy_state_before(); 1287 Value y = pop(type); 1288 Value x = pop(type); 1289 if_node(x, cond, y, state_before); 1290 } 1291 1292 1293 void GraphBuilder::jsr(int dest) { 1294 // We only handle well-formed jsrs (those which are "block-structured"). 1295 // If the bytecodes are strange (jumping out of a jsr block) then we 1296 // might end up trying to re-parse a block containing a jsr which 1297 // has already been activated. Watch for this case and bail out. 1298 for (ScopeData* cur_scope_data = scope_data(); 1299 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope(); 1300 cur_scope_data = cur_scope_data->parent()) { 1301 if (cur_scope_data->jsr_entry_bci() == dest) { 1302 BAILOUT("too-complicated jsr/ret structure"); 1303 } 1304 } 1305 1306 push(addressType, append(new Constant(new AddressConstant(next_bci())))); 1307 if (!try_inline_jsr(dest)) { 1308 return; // bailed out while parsing and inlining subroutine 1309 } 1310 } 1311 1312 1313 void GraphBuilder::ret(int local_index) { 1314 if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine"); 1315 1316 if (local_index != scope_data()->jsr_return_address_local()) { 1317 BAILOUT("can not handle complicated jsr/ret constructs"); 1318 } 1319 1320 // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation 1321 append(new Goto(scope_data()->jsr_continuation(), false)); 1322 } 1323 1324 1325 void GraphBuilder::table_switch() { 1326 Bytecode_tableswitch sw(stream()); 1327 const int l = sw.length(); 1328 if (CanonicalizeNodes && l == 1 && compilation()->env()->comp_level() != CompLevel_full_profile) { 1329 // total of 2 successors => use If instead of switch 1330 // Note: This code should go into the canonicalizer as soon as it can 1331 // can handle canonicalized forms that contain more than one node. 1332 Value key = append(new Constant(new IntConstant(sw.low_key()))); 1333 BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0)); 1334 BlockBegin* fsux = block_at(bci() + sw.default_offset()); 1335 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci(); 1336 // In case of loop invariant code motion or predicate insertion 1337 // before the body of a loop the state is needed 1338 ValueStack* state_before = copy_state_if_bb(is_bb); 1339 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb)); 1340 } else { 1341 // collect successors 1342 BlockList* sux = new BlockList(l + 1, NULL); 1343 int i; 1344 bool has_bb = false; 1345 for (i = 0; i < l; i++) { 1346 sux->at_put(i, block_at(bci() + sw.dest_offset_at(i))); 1347 if (sw.dest_offset_at(i) < 0) has_bb = true; 1348 } 1349 // add default successor 1350 if (sw.default_offset() < 0) has_bb = true; 1351 sux->at_put(i, block_at(bci() + sw.default_offset())); 1352 // In case of loop invariant code motion or predicate insertion 1353 // before the body of a loop the state is needed 1354 ValueStack* state_before = copy_state_if_bb(has_bb); 1355 Instruction* res = append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb)); 1356 #ifdef ASSERT 1357 if (res->as_Goto()) { 1358 for (i = 0; i < l; i++) { 1359 if (sux->at(i) == res->as_Goto()->sux_at(0)) { 1360 assert(res->as_Goto()->is_safepoint() == sw.dest_offset_at(i) < 0, "safepoint state of Goto returned by canonicalizer incorrect"); 1361 } 1362 } 1363 } 1364 #endif 1365 } 1366 } 1367 1368 1369 void GraphBuilder::lookup_switch() { 1370 Bytecode_lookupswitch sw(stream()); 1371 const int l = sw.number_of_pairs(); 1372 if (CanonicalizeNodes && l == 1 && compilation()->env()->comp_level() != CompLevel_full_profile) { 1373 // total of 2 successors => use If instead of switch 1374 // Note: This code should go into the canonicalizer as soon as it can 1375 // can handle canonicalized forms that contain more than one node. 1376 // simplify to If 1377 LookupswitchPair pair = sw.pair_at(0); 1378 Value key = append(new Constant(new IntConstant(pair.match()))); 1379 BlockBegin* tsux = block_at(bci() + pair.offset()); 1380 BlockBegin* fsux = block_at(bci() + sw.default_offset()); 1381 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci(); 1382 // In case of loop invariant code motion or predicate insertion 1383 // before the body of a loop the state is needed 1384 ValueStack* state_before = copy_state_if_bb(is_bb);; 1385 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb)); 1386 } else { 1387 // collect successors & keys 1388 BlockList* sux = new BlockList(l + 1, NULL); 1389 intArray* keys = new intArray(l, l, 0); 1390 int i; 1391 bool has_bb = false; 1392 for (i = 0; i < l; i++) { 1393 LookupswitchPair pair = sw.pair_at(i); 1394 if (pair.offset() < 0) has_bb = true; 1395 sux->at_put(i, block_at(bci() + pair.offset())); 1396 keys->at_put(i, pair.match()); 1397 } 1398 // add default successor 1399 if (sw.default_offset() < 0) has_bb = true; 1400 sux->at_put(i, block_at(bci() + sw.default_offset())); 1401 // In case of loop invariant code motion or predicate insertion 1402 // before the body of a loop the state is needed 1403 ValueStack* state_before = copy_state_if_bb(has_bb); 1404 Instruction* res = append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb)); 1405 #ifdef ASSERT 1406 if (res->as_Goto()) { 1407 for (i = 0; i < l; i++) { 1408 if (sux->at(i) == res->as_Goto()->sux_at(0)) { 1409 assert(res->as_Goto()->is_safepoint() == sw.pair_at(i).offset() < 0, "safepoint state of Goto returned by canonicalizer incorrect"); 1410 } 1411 } 1412 } 1413 #endif 1414 } 1415 } 1416 1417 void GraphBuilder::call_register_finalizer() { 1418 // If the receiver requires finalization then emit code to perform 1419 // the registration on return. 1420 1421 // Gather some type information about the receiver 1422 Value receiver = state()->local_at(0); 1423 assert(receiver != NULL, "must have a receiver"); 1424 ciType* declared_type = receiver->declared_type(); 1425 ciType* exact_type = receiver->exact_type(); 1426 if (exact_type == NULL && 1427 receiver->as_Local() && 1428 receiver->as_Local()->java_index() == 0) { 1429 ciInstanceKlass* ik = compilation()->method()->holder(); 1430 if (ik->is_final()) { 1431 exact_type = ik; 1432 } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) { 1433 // test class is leaf class 1434 compilation()->dependency_recorder()->assert_leaf_type(ik); 1435 exact_type = ik; 1436 } else { 1437 declared_type = ik; 1438 } 1439 } 1440 1441 // see if we know statically that registration isn't required 1442 bool needs_check = true; 1443 if (exact_type != NULL) { 1444 needs_check = exact_type->as_instance_klass()->has_finalizer(); 1445 } else if (declared_type != NULL) { 1446 ciInstanceKlass* ik = declared_type->as_instance_klass(); 1447 if (!Dependencies::has_finalizable_subclass(ik)) { 1448 compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik); 1449 needs_check = false; 1450 } 1451 } 1452 1453 if (needs_check) { 1454 // Perform the registration of finalizable objects. 1455 ValueStack* state_before = copy_state_for_exception(); 1456 load_local(objectType, 0); 1457 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init, 1458 state()->pop_arguments(1), 1459 true, state_before, true)); 1460 } 1461 } 1462 1463 1464 void GraphBuilder::method_return(Value x, bool ignore_return) { 1465 if (RegisterFinalizersAtInit && 1466 method()->intrinsic_id() == vmIntrinsics::_Object_init) { 1467 call_register_finalizer(); 1468 } 1469 1470 bool need_mem_bar = false; 1471 if (method()->name() == ciSymbol::object_initializer_name() && 1472 (scope()->wrote_final() || (AlwaysSafeConstructors && scope()->wrote_fields()) 1473 || (support_IRIW_for_not_multiple_copy_atomic_cpu && scope()->wrote_volatile()) 1474 )){ 1475 need_mem_bar = true; 1476 } 1477 1478 BasicType bt = method()->return_type()->basic_type(); 1479 switch (bt) { 1480 case T_BYTE: 1481 { 1482 Value shift = append(new Constant(new IntConstant(24))); 1483 x = append(new ShiftOp(Bytecodes::_ishl, x, shift)); 1484 x = append(new ShiftOp(Bytecodes::_ishr, x, shift)); 1485 break; 1486 } 1487 case T_SHORT: 1488 { 1489 Value shift = append(new Constant(new IntConstant(16))); 1490 x = append(new ShiftOp(Bytecodes::_ishl, x, shift)); 1491 x = append(new ShiftOp(Bytecodes::_ishr, x, shift)); 1492 break; 1493 } 1494 case T_CHAR: 1495 { 1496 Value mask = append(new Constant(new IntConstant(0xFFFF))); 1497 x = append(new LogicOp(Bytecodes::_iand, x, mask)); 1498 break; 1499 } 1500 case T_BOOLEAN: 1501 { 1502 Value mask = append(new Constant(new IntConstant(1))); 1503 x = append(new LogicOp(Bytecodes::_iand, x, mask)); 1504 break; 1505 } 1506 default: 1507 break; 1508 } 1509 1510 // Check to see whether we are inlining. If so, Return 1511 // instructions become Gotos to the continuation point. 1512 if (continuation() != NULL) { 1513 1514 int invoke_bci = state()->caller_state()->bci(); 1515 1516 if (x != NULL && !ignore_return) { 1517 ciMethod* caller = state()->scope()->caller()->method(); 1518 Bytecodes::Code invoke_raw_bc = caller->raw_code_at_bci(invoke_bci); 1519 if (invoke_raw_bc == Bytecodes::_invokehandle || invoke_raw_bc == Bytecodes::_invokedynamic) { 1520 ciType* declared_ret_type = caller->get_declared_signature_at_bci(invoke_bci)->return_type(); 1521 if (declared_ret_type->is_klass() && x->exact_type() == NULL && 1522 x->declared_type() != declared_ret_type && declared_ret_type != compilation()->env()->Object_klass()) { 1523 x = append(new TypeCast(declared_ret_type->as_klass(), x, copy_state_before())); 1524 } 1525 } 1526 } 1527 1528 assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet"); 1529 1530 if (compilation()->env()->dtrace_method_probes()) { 1531 // Report exit from inline methods 1532 Values* args = new Values(1); 1533 args->push(append(new Constant(new MethodConstant(method())))); 1534 append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args)); 1535 } 1536 1537 // If the inlined method is synchronized, the monitor must be 1538 // released before we jump to the continuation block. 1539 if (method()->is_synchronized()) { 1540 assert(state()->locks_size() == 1, "receiver must be locked here"); 1541 monitorexit(state()->lock_at(0), SynchronizationEntryBCI); 1542 } 1543 1544 if (need_mem_bar) { 1545 append(new MemBar(lir_membar_storestore)); 1546 } 1547 1548 // State at end of inlined method is the state of the caller 1549 // without the method parameters on stack, including the 1550 // return value, if any, of the inlined method on operand stack. 1551 set_state(state()->caller_state()->copy_for_parsing()); 1552 if (x != NULL) { 1553 if (!ignore_return) { 1554 state()->push(x->type(), x); 1555 } 1556 if (profile_return() && x->type()->is_object_kind()) { 1557 ciMethod* caller = state()->scope()->method(); 1558 profile_return_type(x, method(), caller, invoke_bci); 1559 } 1560 } 1561 Goto* goto_callee = new Goto(continuation(), false); 1562 1563 // See whether this is the first return; if so, store off some 1564 // of the state for later examination 1565 if (num_returns() == 0) { 1566 set_inline_cleanup_info(); 1567 } 1568 1569 // The current bci() is in the wrong scope, so use the bci() of 1570 // the continuation point. 1571 append_with_bci(goto_callee, scope_data()->continuation()->bci()); 1572 incr_num_returns(); 1573 return; 1574 } 1575 1576 state()->truncate_stack(0); 1577 if (method()->is_synchronized()) { 1578 // perform the unlocking before exiting the method 1579 Value receiver; 1580 if (!method()->is_static()) { 1581 receiver = _initial_state->local_at(0); 1582 } else { 1583 receiver = append(new Constant(new ClassConstant(method()->holder()))); 1584 } 1585 append_split(new MonitorExit(receiver, state()->unlock())); 1586 } 1587 1588 if (need_mem_bar) { 1589 append(new MemBar(lir_membar_storestore)); 1590 } 1591 1592 assert(!ignore_return, "Ignoring return value works only for inlining"); 1593 append(new Return(x)); 1594 } 1595 1596 Value GraphBuilder::make_constant(ciConstant field_value, ciField* field) { 1597 if (!field_value.is_valid()) return NULL; 1598 1599 BasicType field_type = field_value.basic_type(); 1600 ValueType* value = as_ValueType(field_value); 1601 1602 // Attach dimension info to stable arrays. 1603 if (FoldStableValues && 1604 field->is_stable() && field_type == T_ARRAY && !field_value.is_null_or_zero()) { 1605 ciArray* array = field_value.as_object()->as_array(); 1606 jint dimension = field->type()->as_array_klass()->dimension(); 1607 value = new StableArrayConstant(array, dimension); 1608 } 1609 1610 switch (field_type) { 1611 case T_ARRAY: 1612 case T_OBJECT: 1613 if (field_value.as_object()->should_be_constant()) { 1614 return new Constant(value); 1615 } 1616 return NULL; // Not a constant. 1617 default: 1618 return new Constant(value); 1619 } 1620 } 1621 1622 void GraphBuilder::access_field(Bytecodes::Code code) { 1623 bool will_link; 1624 ciField* field = stream()->get_field(will_link); 1625 ciInstanceKlass* holder = field->holder(); 1626 BasicType field_type = field->type()->basic_type(); 1627 ValueType* type = as_ValueType(field_type); 1628 // call will_link again to determine if the field is valid. 1629 const bool needs_patching = !holder->is_loaded() || 1630 !field->will_link(method(), code) || 1631 PatchALot; 1632 1633 ValueStack* state_before = NULL; 1634 if (!holder->is_initialized() || needs_patching) { 1635 // save state before instruction for debug info when 1636 // deoptimization happens during patching 1637 state_before = copy_state_before(); 1638 } 1639 1640 Value obj = NULL; 1641 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) { 1642 if (state_before != NULL) { 1643 // build a patching constant 1644 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before); 1645 } else { 1646 obj = new Constant(new InstanceConstant(holder->java_mirror())); 1647 } 1648 } 1649 1650 if (field->is_final() && (code == Bytecodes::_putfield)) { 1651 scope()->set_wrote_final(); 1652 } 1653 1654 if (code == Bytecodes::_putfield) { 1655 scope()->set_wrote_fields(); 1656 if (field->is_volatile()) { 1657 scope()->set_wrote_volatile(); 1658 } 1659 } 1660 1661 const int offset = !needs_patching ? field->offset() : -1; 1662 switch (code) { 1663 case Bytecodes::_getstatic: { 1664 // check for compile-time constants, i.e., initialized static final fields 1665 Value constant = NULL; 1666 if (field->is_static_constant() && !PatchALot) { 1667 ciConstant field_value = field->constant_value(); 1668 assert(!field->is_stable() || !field_value.is_null_or_zero(), 1669 "stable static w/ default value shouldn't be a constant"); 1670 constant = make_constant(field_value, field); 1671 } 1672 if (constant != NULL) { 1673 push(type, append(constant)); 1674 } else { 1675 if (state_before == NULL) { 1676 state_before = copy_state_for_exception(); 1677 } 1678 push(type, append(new LoadField(append(obj), offset, field, true, 1679 state_before, needs_patching))); 1680 } 1681 break; 1682 } 1683 case Bytecodes::_putstatic: { 1684 Value val = pop(type); 1685 if (state_before == NULL) { 1686 state_before = copy_state_for_exception(); 1687 } 1688 if (field->type()->basic_type() == T_BOOLEAN) { 1689 Value mask = append(new Constant(new IntConstant(1))); 1690 val = append(new LogicOp(Bytecodes::_iand, val, mask)); 1691 } 1692 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching)); 1693 break; 1694 } 1695 case Bytecodes::_getfield: { 1696 // Check for compile-time constants, i.e., trusted final non-static fields. 1697 Value constant = NULL; 1698 obj = apop(); 1699 ObjectType* obj_type = obj->type()->as_ObjectType(); 1700 if (field->is_constant() && obj_type->is_constant() && !PatchALot) { 1701 ciObject* const_oop = obj_type->constant_value(); 1702 if (!const_oop->is_null_object() && const_oop->is_loaded()) { 1703 ciConstant field_value = field->constant_value_of(const_oop); 1704 if (field_value.is_valid()) { 1705 constant = make_constant(field_value, field); 1706 // For CallSite objects add a dependency for invalidation of the optimization. 1707 if (field->is_call_site_target()) { 1708 ciCallSite* call_site = const_oop->as_call_site(); 1709 if (!call_site->is_constant_call_site()) { 1710 ciMethodHandle* target = field_value.as_object()->as_method_handle(); 1711 dependency_recorder()->assert_call_site_target_value(call_site, target); 1712 } 1713 } 1714 } 1715 } 1716 } 1717 if (constant != NULL) { 1718 push(type, append(constant)); 1719 } else { 1720 if (state_before == NULL) { 1721 state_before = copy_state_for_exception(); 1722 } 1723 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching); 1724 Value replacement = !needs_patching ? _memory->load(load) : load; 1725 if (replacement != load) { 1726 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked"); 1727 push(type, replacement); 1728 } else { 1729 push(type, append(load)); 1730 } 1731 } 1732 break; 1733 } 1734 case Bytecodes::_putfield: { 1735 Value val = pop(type); 1736 obj = apop(); 1737 if (state_before == NULL) { 1738 state_before = copy_state_for_exception(); 1739 } 1740 if (field->type()->basic_type() == T_BOOLEAN) { 1741 Value mask = append(new Constant(new IntConstant(1))); 1742 val = append(new LogicOp(Bytecodes::_iand, val, mask)); 1743 } 1744 StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching); 1745 if (!needs_patching) store = _memory->store(store); 1746 if (store != NULL) { 1747 append(store); 1748 } 1749 break; 1750 } 1751 default: 1752 ShouldNotReachHere(); 1753 break; 1754 } 1755 } 1756 1757 1758 Dependencies* GraphBuilder::dependency_recorder() const { 1759 assert(DeoptC1, "need debug information"); 1760 return compilation()->dependency_recorder(); 1761 } 1762 1763 // How many arguments do we want to profile? 1764 Values* GraphBuilder::args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver) { 1765 int n = 0; 1766 bool has_receiver = may_have_receiver && Bytecodes::has_receiver(method()->java_code_at_bci(bci())); 1767 start = has_receiver ? 1 : 0; 1768 if (profile_arguments()) { 1769 ciProfileData* data = method()->method_data()->bci_to_data(bci()); 1770 if (data != NULL && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) { 1771 n = data->is_CallTypeData() ? data->as_CallTypeData()->number_of_arguments() : data->as_VirtualCallTypeData()->number_of_arguments(); 1772 } 1773 } 1774 // If we are inlining then we need to collect arguments to profile parameters for the target 1775 if (profile_parameters() && target != NULL) { 1776 if (target->method_data() != NULL && target->method_data()->parameters_type_data() != NULL) { 1777 // The receiver is profiled on method entry so it's included in 1778 // the number of parameters but here we're only interested in 1779 // actual arguments. 1780 n = MAX2(n, target->method_data()->parameters_type_data()->number_of_parameters() - start); 1781 } 1782 } 1783 if (n > 0) { 1784 return new Values(n); 1785 } 1786 return NULL; 1787 } 1788 1789 void GraphBuilder::check_args_for_profiling(Values* obj_args, int expected) { 1790 #ifdef ASSERT 1791 bool ignored_will_link; 1792 ciSignature* declared_signature = NULL; 1793 ciMethod* real_target = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature); 1794 assert(expected == obj_args->max_length() || real_target->is_method_handle_intrinsic(), "missed on arg?"); 1795 #endif 1796 } 1797 1798 // Collect arguments that we want to profile in a list 1799 Values* GraphBuilder::collect_args_for_profiling(Values* args, ciMethod* target, bool may_have_receiver) { 1800 int start = 0; 1801 Values* obj_args = args_list_for_profiling(target, start, may_have_receiver); 1802 if (obj_args == NULL) { 1803 return NULL; 1804 } 1805 int s = obj_args->max_length(); 1806 // if called through method handle invoke, some arguments may have been popped 1807 for (int i = start, j = 0; j < s && i < args->length(); i++) { 1808 if (args->at(i)->type()->is_object_kind()) { 1809 obj_args->push(args->at(i)); 1810 j++; 1811 } 1812 } 1813 check_args_for_profiling(obj_args, s); 1814 return obj_args; 1815 } 1816 1817 1818 void GraphBuilder::invoke(Bytecodes::Code code) { 1819 bool will_link; 1820 ciSignature* declared_signature = NULL; 1821 ciMethod* target = stream()->get_method(will_link, &declared_signature); 1822 ciKlass* holder = stream()->get_declared_method_holder(); 1823 const Bytecodes::Code bc_raw = stream()->cur_bc_raw(); 1824 assert(declared_signature != NULL, "cannot be null"); 1825 assert(will_link == target->is_loaded(), ""); 1826 1827 ciInstanceKlass* klass = target->holder(); 1828 assert(!target->is_loaded() || klass->is_loaded(), "loaded target must imply loaded klass"); 1829 1830 // check if CHA possible: if so, change the code to invoke_special 1831 ciInstanceKlass* calling_klass = method()->holder(); 1832 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); 1833 ciInstanceKlass* actual_recv = callee_holder; 1834 1835 CompileLog* log = compilation()->log(); 1836 if (log != NULL) 1837 log->elem("call method='%d' instr='%s'", 1838 log->identify(target), 1839 Bytecodes::name(code)); 1840 1841 // invoke-special-super 1842 if (bc_raw == Bytecodes::_invokespecial && !target->is_object_initializer()) { 1843 ciInstanceKlass* sender_klass = 1844 calling_klass->is_unsafe_anonymous() ? calling_klass->unsafe_anonymous_host() : 1845 calling_klass; 1846 if (sender_klass->is_interface()) { 1847 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1); 1848 Value receiver = state()->stack_at(index); 1849 CheckCast* c = new CheckCast(sender_klass, receiver, copy_state_before()); 1850 c->set_invokespecial_receiver_check(); 1851 state()->stack_at_put(index, append_split(c)); 1852 } 1853 } 1854 1855 // Some methods are obviously bindable without any type checks so 1856 // convert them directly to an invokespecial or invokestatic. 1857 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) { 1858 switch (bc_raw) { 1859 case Bytecodes::_invokevirtual: 1860 code = Bytecodes::_invokespecial; 1861 break; 1862 case Bytecodes::_invokehandle: 1863 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial; 1864 break; 1865 default: 1866 break; 1867 } 1868 } else { 1869 if (bc_raw == Bytecodes::_invokehandle) { 1870 assert(!will_link, "should come here only for unlinked call"); 1871 code = Bytecodes::_invokespecial; 1872 } 1873 } 1874 1875 // Push appendix argument (MethodType, CallSite, etc.), if one. 1876 bool patch_for_appendix = false; 1877 int patching_appendix_arg = 0; 1878 if (Bytecodes::has_optional_appendix(bc_raw) && (!will_link || PatchALot)) { 1879 Value arg = append(new Constant(new ObjectConstant(compilation()->env()->unloaded_ciinstance()), copy_state_before())); 1880 apush(arg); 1881 patch_for_appendix = true; 1882 patching_appendix_arg = (will_link && stream()->has_appendix()) ? 0 : 1; 1883 } else if (stream()->has_appendix()) { 1884 ciObject* appendix = stream()->get_appendix(); 1885 Value arg = append(new Constant(new ObjectConstant(appendix))); 1886 apush(arg); 1887 } 1888 1889 ciMethod* cha_monomorphic_target = NULL; 1890 ciMethod* exact_target = NULL; 1891 Value better_receiver = NULL; 1892 if (UseCHA && DeoptC1 && target->is_loaded() && 1893 !(// %%% FIXME: Are both of these relevant? 1894 target->is_method_handle_intrinsic() || 1895 target->is_compiled_lambda_form()) && 1896 !patch_for_appendix) { 1897 Value receiver = NULL; 1898 ciInstanceKlass* receiver_klass = NULL; 1899 bool type_is_exact = false; 1900 // try to find a precise receiver type 1901 if (will_link && !target->is_static()) { 1902 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1); 1903 receiver = state()->stack_at(index); 1904 ciType* type = receiver->exact_type(); 1905 if (type != NULL && type->is_loaded() && 1906 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) { 1907 receiver_klass = (ciInstanceKlass*) type; 1908 type_is_exact = true; 1909 } 1910 if (type == NULL) { 1911 type = receiver->declared_type(); 1912 if (type != NULL && type->is_loaded() && 1913 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) { 1914 receiver_klass = (ciInstanceKlass*) type; 1915 if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) { 1916 // Insert a dependency on this type since 1917 // find_monomorphic_target may assume it's already done. 1918 dependency_recorder()->assert_leaf_type(receiver_klass); 1919 type_is_exact = true; 1920 } 1921 } 1922 } 1923 } 1924 if (receiver_klass != NULL && type_is_exact && 1925 receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) { 1926 // If we have the exact receiver type we can bind directly to 1927 // the method to call. 1928 exact_target = target->resolve_invoke(calling_klass, receiver_klass); 1929 if (exact_target != NULL) { 1930 target = exact_target; 1931 code = Bytecodes::_invokespecial; 1932 } 1933 } 1934 if (receiver_klass != NULL && 1935 receiver_klass->is_subtype_of(actual_recv) && 1936 actual_recv->is_initialized()) { 1937 actual_recv = receiver_klass; 1938 } 1939 1940 if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) || 1941 (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) { 1942 // Use CHA on the receiver to select a more precise method. 1943 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); 1944 } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != NULL) { 1945 assert(callee_holder->is_interface(), "invokeinterface to non interface?"); 1946 // If there is only one implementor of this interface then we 1947 // may be able bind this invoke directly to the implementing 1948 // klass but we need both a dependence on the single interface 1949 // and on the method we bind to. Additionally since all we know 1950 // about the receiver type is the it's supposed to implement the 1951 // interface we have to insert a check that it's the class we 1952 // expect. Interface types are not checked by the verifier so 1953 // they are roughly equivalent to Object. 1954 // The number of implementors for declared_interface is less or 1955 // equal to the number of implementors for target->holder() so 1956 // if number of implementors of target->holder() == 1 then 1957 // number of implementors for decl_interface is 0 or 1. If 1958 // it's 0 then no class implements decl_interface and there's 1959 // no point in inlining. 1960 ciInstanceKlass* singleton = NULL; 1961 ciInstanceKlass* declared_interface = callee_holder; 1962 if (declared_interface->nof_implementors() == 1 && 1963 (!target->is_default_method() || target->is_overpass()) /* CHA doesn't support default methods yet. */) { 1964 singleton = declared_interface->implementor(); 1965 assert(singleton != NULL && singleton != declared_interface, ""); 1966 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, declared_interface, singleton); 1967 if (cha_monomorphic_target != NULL) { 1968 if (cha_monomorphic_target->holder() != compilation()->env()->Object_klass()) { 1969 // If CHA is able to bind this invoke then update the class 1970 // to match that class, otherwise klass will refer to the 1971 // interface. 1972 klass = cha_monomorphic_target->holder(); 1973 actual_recv = declared_interface; 1974 1975 // insert a check it's really the expected class. 1976 CheckCast* c = new CheckCast(klass, receiver, copy_state_for_exception()); 1977 c->set_incompatible_class_change_check(); 1978 c->set_direct_compare(klass->is_final()); 1979 // pass the result of the checkcast so that the compiler has 1980 // more accurate type info in the inlinee 1981 better_receiver = append_split(c); 1982 } else { 1983 cha_monomorphic_target = NULL; // subtype check against Object is useless 1984 } 1985 } 1986 } 1987 } 1988 } 1989 1990 if (cha_monomorphic_target != NULL) { 1991 assert(!target->can_be_statically_bound() || target == cha_monomorphic_target, ""); 1992 assert(!cha_monomorphic_target->is_abstract(), ""); 1993 if (!cha_monomorphic_target->can_be_statically_bound(actual_recv)) { 1994 // If we inlined because CHA revealed only a single target method, 1995 // then we are dependent on that target method not getting overridden 1996 // by dynamic class loading. Be sure to test the "static" receiver 1997 // dest_method here, as opposed to the actual receiver, which may 1998 // falsely lead us to believe that the receiver is final or private. 1999 dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target); 2000 } 2001 code = Bytecodes::_invokespecial; 2002 } 2003 2004 // check if we could do inlining 2005 if (!PatchALot && Inline && target->is_loaded() && 2006 (klass->is_initialized() || (klass->is_interface() && target->holder()->is_initialized())) 2007 && !patch_for_appendix) { 2008 // callee is known => check if we have static binding 2009 if (code == Bytecodes::_invokestatic || 2010 code == Bytecodes::_invokespecial || 2011 (code == Bytecodes::_invokevirtual && target->is_final_method()) || 2012 code == Bytecodes::_invokedynamic) { 2013 ciMethod* inline_target = (cha_monomorphic_target != NULL) ? cha_monomorphic_target : target; 2014 // static binding => check if callee is ok 2015 bool success = try_inline(inline_target, (cha_monomorphic_target != NULL) || (exact_target != NULL), false, code, better_receiver); 2016 2017 CHECK_BAILOUT(); 2018 clear_inline_bailout(); 2019 2020 if (success) { 2021 // Register dependence if JVMTI has either breakpoint 2022 // setting or hotswapping of methods capabilities since they may 2023 // cause deoptimization. 2024 if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) { 2025 dependency_recorder()->assert_evol_method(inline_target); 2026 } 2027 return; 2028 } 2029 } else { 2030 print_inlining(target, "no static binding", /*success*/ false); 2031 } 2032 } else { 2033 print_inlining(target, "not inlineable", /*success*/ false); 2034 } 2035 2036 // If we attempted an inline which did not succeed because of a 2037 // bailout during construction of the callee graph, the entire 2038 // compilation has to be aborted. This is fairly rare and currently 2039 // seems to only occur for jasm-generated classes which contain 2040 // jsr/ret pairs which are not associated with finally clauses and 2041 // do not have exception handlers in the containing method, and are 2042 // therefore not caught early enough to abort the inlining without 2043 // corrupting the graph. (We currently bail out with a non-empty 2044 // stack at a ret in these situations.) 2045 CHECK_BAILOUT(); 2046 2047 // inlining not successful => standard invoke 2048 ValueType* result_type = as_ValueType(declared_signature->return_type()); 2049 ValueStack* state_before = copy_state_exhandling(); 2050 2051 // The bytecode (code) might change in this method so we are checking this very late. 2052 const bool has_receiver = 2053 code == Bytecodes::_invokespecial || 2054 code == Bytecodes::_invokevirtual || 2055 code == Bytecodes::_invokeinterface; 2056 Values* args = state()->pop_arguments(target->arg_size_no_receiver() + patching_appendix_arg); 2057 Value recv = has_receiver ? apop() : NULL; 2058 int vtable_index = Method::invalid_vtable_index; 2059 2060 #ifdef SPARC 2061 // Currently only supported on Sparc. 2062 // The UseInlineCaches only controls dispatch to invokevirtuals for 2063 // loaded classes which we weren't able to statically bind. 2064 if (!UseInlineCaches && target->is_loaded() && code == Bytecodes::_invokevirtual 2065 && !target->can_be_statically_bound()) { 2066 // Find a vtable index if one is available 2067 // For arrays, callee_holder is Object. Resolving the call with 2068 // Object would allow an illegal call to finalize() on an 2069 // array. We use holder instead: illegal calls to finalize() won't 2070 // be compiled as vtable calls (IC call resolution will catch the 2071 // illegal call) and the few legal calls on array types won't be 2072 // either. 2073 vtable_index = target->resolve_vtable_index(calling_klass, holder); 2074 } 2075 #endif 2076 2077 // A null check is required here (when there is a receiver) for any of the following cases 2078 // - invokespecial, always need a null check. 2079 // - invokevirtual, when the target is final and loaded. Calls to final targets will become optimized 2080 // and require null checking. If the target is loaded a null check is emitted here. 2081 // If the target isn't loaded the null check must happen after the call resolution. We achieve that 2082 // by using the target methods unverified entry point (see CompiledIC::compute_monomorphic_entry). 2083 // (The JVM specification requires that LinkageError must be thrown before a NPE. An unloaded target may 2084 // potentially fail, and can't have the null check before the resolution.) 2085 // - A call that will be profiled. (But we can't add a null check when the target is unloaded, by the same 2086 // reason as above, so calls with a receiver to unloaded targets can't be profiled.) 2087 // 2088 // Normal invokevirtual will perform the null check during lookup 2089 2090 bool need_null_check = (code == Bytecodes::_invokespecial) || 2091 (target->is_loaded() && (target->is_final_method() || (is_profiling() && profile_calls()))); 2092 2093 if (need_null_check) { 2094 if (recv != NULL) { 2095 null_check(recv); 2096 } 2097 2098 if (is_profiling()) { 2099 // Note that we'd collect profile data in this method if we wanted it. 2100 compilation()->set_would_profile(true); 2101 2102 if (profile_calls()) { 2103 assert(cha_monomorphic_target == NULL || exact_target == NULL, "both can not be set"); 2104 ciKlass* target_klass = NULL; 2105 if (cha_monomorphic_target != NULL) { 2106 target_klass = cha_monomorphic_target->holder(); 2107 } else if (exact_target != NULL) { 2108 target_klass = exact_target->holder(); 2109 } 2110 profile_call(target, recv, target_klass, collect_args_for_profiling(args, NULL, false), false); 2111 } 2112 } 2113 } 2114 2115 Invoke* result = new Invoke(code, result_type, recv, args, vtable_index, target, state_before); 2116 // push result 2117 append_split(result); 2118 2119 if (result_type != voidType) { 2120 if (method()->is_strict()) { 2121 push(result_type, round_fp(result)); 2122 } else { 2123 push(result_type, result); 2124 } 2125 } 2126 if (profile_return() && result_type->is_object_kind()) { 2127 profile_return_type(result, target); 2128 } 2129 } 2130 2131 2132 void GraphBuilder::new_instance(int klass_index) { 2133 ValueStack* state_before = copy_state_exhandling(); 2134 bool will_link; 2135 ciKlass* klass = stream()->get_klass(will_link); 2136 assert(klass->is_instance_klass(), "must be an instance klass"); 2137 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before, stream()->is_unresolved_klass()); 2138 _memory->new_instance(new_instance); 2139 apush(append_split(new_instance)); 2140 } 2141 2142 2143 void GraphBuilder::new_type_array() { 2144 ValueStack* state_before = copy_state_exhandling(); 2145 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before))); 2146 } 2147 2148 2149 void GraphBuilder::new_object_array() { 2150 bool will_link; 2151 ciKlass* klass = stream()->get_klass(will_link); 2152 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 2153 NewArray* n = new NewObjectArray(klass, ipop(), state_before); 2154 apush(append_split(n)); 2155 } 2156 2157 2158 bool GraphBuilder::direct_compare(ciKlass* k) { 2159 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) { 2160 ciInstanceKlass* ik = k->as_instance_klass(); 2161 if (ik->is_final()) { 2162 return true; 2163 } else { 2164 if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) { 2165 // test class is leaf class 2166 dependency_recorder()->assert_leaf_type(ik); 2167 return true; 2168 } 2169 } 2170 } 2171 return false; 2172 } 2173 2174 2175 void GraphBuilder::check_cast(int klass_index) { 2176 bool will_link; 2177 ciKlass* klass = stream()->get_klass(will_link); 2178 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception(); 2179 CheckCast* c = new CheckCast(klass, apop(), state_before); 2180 apush(append_split(c)); 2181 c->set_direct_compare(direct_compare(klass)); 2182 2183 if (is_profiling()) { 2184 // Note that we'd collect profile data in this method if we wanted it. 2185 compilation()->set_would_profile(true); 2186 2187 if (profile_checkcasts()) { 2188 c->set_profiled_method(method()); 2189 c->set_profiled_bci(bci()); 2190 c->set_should_profile(true); 2191 } 2192 } 2193 } 2194 2195 2196 void GraphBuilder::instance_of(int klass_index) { 2197 bool will_link; 2198 ciKlass* klass = stream()->get_klass(will_link); 2199 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 2200 InstanceOf* i = new InstanceOf(klass, apop(), state_before); 2201 ipush(append_split(i)); 2202 i->set_direct_compare(direct_compare(klass)); 2203 2204 if (is_profiling()) { 2205 // Note that we'd collect profile data in this method if we wanted it. 2206 compilation()->set_would_profile(true); 2207 2208 if (profile_checkcasts()) { 2209 i->set_profiled_method(method()); 2210 i->set_profiled_bci(bci()); 2211 i->set_should_profile(true); 2212 } 2213 } 2214 } 2215 2216 2217 void GraphBuilder::monitorenter(Value x, int bci) { 2218 // save state before locking in case of deoptimization after a NullPointerException 2219 ValueStack* state_before = copy_state_for_exception_with_bci(bci); 2220 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before), bci); 2221 kill_all(); 2222 } 2223 2224 2225 void GraphBuilder::monitorexit(Value x, int bci) { 2226 append_with_bci(new MonitorExit(x, state()->unlock()), bci); 2227 kill_all(); 2228 } 2229 2230 2231 void GraphBuilder::new_multi_array(int dimensions) { 2232 bool will_link; 2233 ciKlass* klass = stream()->get_klass(will_link); 2234 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 2235 2236 Values* dims = new Values(dimensions, dimensions, NULL); 2237 // fill in all dimensions 2238 int i = dimensions; 2239 while (i-- > 0) dims->at_put(i, ipop()); 2240 // create array 2241 NewArray* n = new NewMultiArray(klass, dims, state_before); 2242 apush(append_split(n)); 2243 } 2244 2245 2246 void GraphBuilder::throw_op(int bci) { 2247 // We require that the debug info for a Throw be the "state before" 2248 // the Throw (i.e., exception oop is still on TOS) 2249 ValueStack* state_before = copy_state_before_with_bci(bci); 2250 Throw* t = new Throw(apop(), state_before); 2251 // operand stack not needed after a throw 2252 state()->truncate_stack(0); 2253 append_with_bci(t, bci); 2254 } 2255 2256 2257 Value GraphBuilder::round_fp(Value fp_value) { 2258 // no rounding needed if SSE2 is used 2259 if (RoundFPResults && UseSSE < 2) { 2260 // Must currently insert rounding node for doubleword values that 2261 // are results of expressions (i.e., not loads from memory or 2262 // constants) 2263 if (fp_value->type()->tag() == doubleTag && 2264 fp_value->as_Constant() == NULL && 2265 fp_value->as_Local() == NULL && // method parameters need no rounding 2266 fp_value->as_RoundFP() == NULL) { 2267 return append(new RoundFP(fp_value)); 2268 } 2269 } 2270 return fp_value; 2271 } 2272 2273 2274 Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) { 2275 Canonicalizer canon(compilation(), instr, bci); 2276 Instruction* i1 = canon.canonical(); 2277 if (i1->is_linked() || !i1->can_be_linked()) { 2278 // Canonicalizer returned an instruction which was already 2279 // appended so simply return it. 2280 return i1; 2281 } 2282 2283 if (UseLocalValueNumbering) { 2284 // Lookup the instruction in the ValueMap and add it to the map if 2285 // it's not found. 2286 Instruction* i2 = vmap()->find_insert(i1); 2287 if (i2 != i1) { 2288 // found an entry in the value map, so just return it. 2289 assert(i2->is_linked(), "should already be linked"); 2290 return i2; 2291 } 2292 ValueNumberingEffects vne(vmap()); 2293 i1->visit(&vne); 2294 } 2295 2296 // i1 was not eliminated => append it 2297 assert(i1->next() == NULL, "shouldn't already be linked"); 2298 _last = _last->set_next(i1, canon.bci()); 2299 2300 if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) { 2301 // set the bailout state but complete normal processing. We 2302 // might do a little more work before noticing the bailout so we 2303 // want processing to continue normally until it's noticed. 2304 bailout("Method and/or inlining is too large"); 2305 } 2306 2307 #ifndef PRODUCT 2308 if (PrintIRDuringConstruction) { 2309 InstructionPrinter ip; 2310 ip.print_line(i1); 2311 if (Verbose) { 2312 state()->print(); 2313 } 2314 } 2315 #endif 2316 2317 // save state after modification of operand stack for StateSplit instructions 2318 StateSplit* s = i1->as_StateSplit(); 2319 if (s != NULL) { 2320 if (EliminateFieldAccess) { 2321 Intrinsic* intrinsic = s->as_Intrinsic(); 2322 if (s->as_Invoke() != NULL || (intrinsic && !intrinsic->preserves_state())) { 2323 _memory->kill(); 2324 } 2325 } 2326 s->set_state(state()->copy(ValueStack::StateAfter, canon.bci())); 2327 } 2328 2329 // set up exception handlers for this instruction if necessary 2330 if (i1->can_trap()) { 2331 i1->set_exception_handlers(handle_exception(i1)); 2332 assert(i1->exception_state() != NULL || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state"); 2333 } 2334 return i1; 2335 } 2336 2337 2338 Instruction* GraphBuilder::append(Instruction* instr) { 2339 assert(instr->as_StateSplit() == NULL || instr->as_BlockEnd() != NULL, "wrong append used"); 2340 return append_with_bci(instr, bci()); 2341 } 2342 2343 2344 Instruction* GraphBuilder::append_split(StateSplit* instr) { 2345 return append_with_bci(instr, bci()); 2346 } 2347 2348 2349 void GraphBuilder::null_check(Value value) { 2350 if (value->as_NewArray() != NULL || value->as_NewInstance() != NULL) { 2351 return; 2352 } else { 2353 Constant* con = value->as_Constant(); 2354 if (con) { 2355 ObjectType* c = con->type()->as_ObjectType(); 2356 if (c && c->is_loaded()) { 2357 ObjectConstant* oc = c->as_ObjectConstant(); 2358 if (!oc || !oc->value()->is_null_object()) { 2359 return; 2360 } 2361 } 2362 } 2363 } 2364 append(new NullCheck(value, copy_state_for_exception())); 2365 } 2366 2367 2368 2369 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) { 2370 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != NULL)) { 2371 assert(instruction->exception_state() == NULL 2372 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState 2373 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->should_retain_local_variables()), 2374 "exception_state should be of exception kind"); 2375 return new XHandlers(); 2376 } 2377 2378 XHandlers* exception_handlers = new XHandlers(); 2379 ScopeData* cur_scope_data = scope_data(); 2380 ValueStack* cur_state = instruction->state_before(); 2381 ValueStack* prev_state = NULL; 2382 int scope_count = 0; 2383 2384 assert(cur_state != NULL, "state_before must be set"); 2385 do { 2386 int cur_bci = cur_state->bci(); 2387 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match"); 2388 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci(), "invalid bci"); 2389 2390 // join with all potential exception handlers 2391 XHandlers* list = cur_scope_data->xhandlers(); 2392 const int n = list->length(); 2393 for (int i = 0; i < n; i++) { 2394 XHandler* h = list->handler_at(i); 2395 if (h->covers(cur_bci)) { 2396 // h is a potential exception handler => join it 2397 compilation()->set_has_exception_handlers(true); 2398 2399 BlockBegin* entry = h->entry_block(); 2400 if (entry == block()) { 2401 // It's acceptable for an exception handler to cover itself 2402 // but we don't handle that in the parser currently. It's 2403 // very rare so we bailout instead of trying to handle it. 2404 BAILOUT_("exception handler covers itself", exception_handlers); 2405 } 2406 assert(entry->bci() == h->handler_bci(), "must match"); 2407 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond"); 2408 2409 // previously this was a BAILOUT, but this is not necessary 2410 // now because asynchronous exceptions are not handled this way. 2411 assert(entry->state() == NULL || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match"); 2412 2413 // xhandler start with an empty expression stack 2414 if (cur_state->stack_size() != 0) { 2415 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci()); 2416 } 2417 if (instruction->exception_state() == NULL) { 2418 instruction->set_exception_state(cur_state); 2419 } 2420 2421 // Note: Usually this join must work. However, very 2422 // complicated jsr-ret structures where we don't ret from 2423 // the subroutine can cause the objects on the monitor 2424 // stacks to not match because blocks can be parsed twice. 2425 // The only test case we've seen so far which exhibits this 2426 // problem is caught by the infinite recursion test in 2427 // GraphBuilder::jsr() if the join doesn't work. 2428 if (!entry->try_merge(cur_state)) { 2429 BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers); 2430 } 2431 2432 // add current state for correct handling of phi functions at begin of xhandler 2433 int phi_operand = entry->add_exception_state(cur_state); 2434 2435 // add entry to the list of xhandlers of this block 2436 _block->add_exception_handler(entry); 2437 2438 // add back-edge from xhandler entry to this block 2439 if (!entry->is_predecessor(_block)) { 2440 entry->add_predecessor(_block); 2441 } 2442 2443 // clone XHandler because phi_operand and scope_count can not be shared 2444 XHandler* new_xhandler = new XHandler(h); 2445 new_xhandler->set_phi_operand(phi_operand); 2446 new_xhandler->set_scope_count(scope_count); 2447 exception_handlers->append(new_xhandler); 2448 2449 // fill in exception handler subgraph lazily 2450 assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet"); 2451 cur_scope_data->add_to_work_list(entry); 2452 2453 // stop when reaching catchall 2454 if (h->catch_type() == 0) { 2455 return exception_handlers; 2456 } 2457 } 2458 } 2459 2460 if (exception_handlers->length() == 0) { 2461 // This scope and all callees do not handle exceptions, so the local 2462 // variables of this scope are not needed. However, the scope itself is 2463 // required for a correct exception stack trace -> clear out the locals. 2464 if (_compilation->env()->should_retain_local_variables()) { 2465 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci()); 2466 } else { 2467 cur_state = cur_state->copy(ValueStack::EmptyExceptionState, cur_state->bci()); 2468 } 2469 if (prev_state != NULL) { 2470 prev_state->set_caller_state(cur_state); 2471 } 2472 if (instruction->exception_state() == NULL) { 2473 instruction->set_exception_state(cur_state); 2474 } 2475 } 2476 2477 // Set up iteration for next time. 2478 // If parsing a jsr, do not grab exception handlers from the 2479 // parent scopes for this method (already got them, and they 2480 // needed to be cloned) 2481 2482 while (cur_scope_data->parsing_jsr()) { 2483 cur_scope_data = cur_scope_data->parent(); 2484 } 2485 2486 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match"); 2487 assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler"); 2488 2489 prev_state = cur_state; 2490 cur_state = cur_state->caller_state(); 2491 cur_scope_data = cur_scope_data->parent(); 2492 scope_count++; 2493 } while (cur_scope_data != NULL); 2494 2495 return exception_handlers; 2496 } 2497 2498 2499 // Helper class for simplifying Phis. 2500 class PhiSimplifier : public BlockClosure { 2501 private: 2502 bool _has_substitutions; 2503 Value simplify(Value v); 2504 2505 public: 2506 PhiSimplifier(BlockBegin* start) : _has_substitutions(false) { 2507 start->iterate_preorder(this); 2508 if (_has_substitutions) { 2509 SubstitutionResolver sr(start); 2510 } 2511 } 2512 void block_do(BlockBegin* b); 2513 bool has_substitutions() const { return _has_substitutions; } 2514 }; 2515 2516 2517 Value PhiSimplifier::simplify(Value v) { 2518 Phi* phi = v->as_Phi(); 2519 2520 if (phi == NULL) { 2521 // no phi function 2522 return v; 2523 } else if (v->has_subst()) { 2524 // already substituted; subst can be phi itself -> simplify 2525 return simplify(v->subst()); 2526 } else if (phi->is_set(Phi::cannot_simplify)) { 2527 // already tried to simplify phi before 2528 return phi; 2529 } else if (phi->is_set(Phi::visited)) { 2530 // break cycles in phi functions 2531 return phi; 2532 } else if (phi->type()->is_illegal()) { 2533 // illegal phi functions are ignored anyway 2534 return phi; 2535 2536 } else { 2537 // mark phi function as processed to break cycles in phi functions 2538 phi->set(Phi::visited); 2539 2540 // simplify x = [y, x] and x = [y, y] to y 2541 Value subst = NULL; 2542 int opd_count = phi->operand_count(); 2543 for (int i = 0; i < opd_count; i++) { 2544 Value opd = phi->operand_at(i); 2545 assert(opd != NULL, "Operand must exist!"); 2546 2547 if (opd->type()->is_illegal()) { 2548 // if one operand is illegal, the entire phi function is illegal 2549 phi->make_illegal(); 2550 phi->clear(Phi::visited); 2551 return phi; 2552 } 2553 2554 Value new_opd = simplify(opd); 2555 assert(new_opd != NULL, "Simplified operand must exist!"); 2556 2557 if (new_opd != phi && new_opd != subst) { 2558 if (subst == NULL) { 2559 subst = new_opd; 2560 } else { 2561 // no simplification possible 2562 phi->set(Phi::cannot_simplify); 2563 phi->clear(Phi::visited); 2564 return phi; 2565 } 2566 } 2567 } 2568 2569 // sucessfully simplified phi function 2570 assert(subst != NULL, "illegal phi function"); 2571 _has_substitutions = true; 2572 phi->clear(Phi::visited); 2573 phi->set_subst(subst); 2574 2575 #ifndef PRODUCT 2576 if (PrintPhiFunctions) { 2577 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()); 2578 } 2579 #endif 2580 2581 return subst; 2582 } 2583 } 2584 2585 2586 void PhiSimplifier::block_do(BlockBegin* b) { 2587 for_each_phi_fun(b, phi, 2588 simplify(phi); 2589 ); 2590 2591 #ifdef ASSERT 2592 for_each_phi_fun(b, phi, 2593 assert(phi->operand_count() != 1 || phi->subst() != phi, "missed trivial simplification"); 2594 ); 2595 2596 ValueStack* state = b->state()->caller_state(); 2597 for_each_state_value(state, value, 2598 Phi* phi = value->as_Phi(); 2599 assert(phi == NULL || phi->block() != b, "must not have phi function to simplify in caller state"); 2600 ); 2601 #endif 2602 } 2603 2604 // This method is called after all blocks are filled with HIR instructions 2605 // It eliminates all Phi functions of the form x = [y, y] and x = [y, x] 2606 void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) { 2607 PhiSimplifier simplifier(start); 2608 } 2609 2610 2611 void GraphBuilder::connect_to_end(BlockBegin* beg) { 2612 // setup iteration 2613 kill_all(); 2614 _block = beg; 2615 _state = beg->state()->copy_for_parsing(); 2616 _last = beg; 2617 iterate_bytecodes_for_block(beg->bci()); 2618 } 2619 2620 2621 BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) { 2622 #ifndef PRODUCT 2623 if (PrintIRDuringConstruction) { 2624 tty->cr(); 2625 InstructionPrinter ip; 2626 ip.print_instr(_block); tty->cr(); 2627 ip.print_stack(_block->state()); tty->cr(); 2628 ip.print_inline_level(_block); 2629 ip.print_head(); 2630 tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size()); 2631 } 2632 #endif 2633 _skip_block = false; 2634 assert(state() != NULL, "ValueStack missing!"); 2635 CompileLog* log = compilation()->log(); 2636 ciBytecodeStream s(method()); 2637 s.reset_to_bci(bci); 2638 int prev_bci = bci; 2639 scope_data()->set_stream(&s); 2640 // iterate 2641 Bytecodes::Code code = Bytecodes::_illegal; 2642 bool push_exception = false; 2643 2644 if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == NULL) { 2645 // first thing in the exception entry block should be the exception object. 2646 push_exception = true; 2647 } 2648 2649 bool ignore_return = scope_data()->ignore_return(); 2650 2651 while (!bailed_out() && last()->as_BlockEnd() == NULL && 2652 (code = stream()->next()) != ciBytecodeStream::EOBC() && 2653 (block_at(s.cur_bci()) == NULL || block_at(s.cur_bci()) == block())) { 2654 assert(state()->kind() == ValueStack::Parsing, "invalid state kind"); 2655 2656 if (log != NULL) 2657 log->set_context("bc code='%d' bci='%d'", (int)code, s.cur_bci()); 2658 2659 // Check for active jsr during OSR compilation 2660 if (compilation()->is_osr_compile() 2661 && scope()->is_top_scope() 2662 && parsing_jsr() 2663 && s.cur_bci() == compilation()->osr_bci()) { 2664 bailout("OSR not supported while a jsr is active"); 2665 } 2666 2667 if (push_exception) { 2668 apush(append(new ExceptionObject())); 2669 push_exception = false; 2670 } 2671 2672 // handle bytecode 2673 switch (code) { 2674 case Bytecodes::_nop : /* nothing to do */ break; 2675 case Bytecodes::_aconst_null : apush(append(new Constant(objectNull ))); break; 2676 case Bytecodes::_iconst_m1 : ipush(append(new Constant(new IntConstant (-1)))); break; 2677 case Bytecodes::_iconst_0 : ipush(append(new Constant(intZero ))); break; 2678 case Bytecodes::_iconst_1 : ipush(append(new Constant(intOne ))); break; 2679 case Bytecodes::_iconst_2 : ipush(append(new Constant(new IntConstant ( 2)))); break; 2680 case Bytecodes::_iconst_3 : ipush(append(new Constant(new IntConstant ( 3)))); break; 2681 case Bytecodes::_iconst_4 : ipush(append(new Constant(new IntConstant ( 4)))); break; 2682 case Bytecodes::_iconst_5 : ipush(append(new Constant(new IntConstant ( 5)))); break; 2683 case Bytecodes::_lconst_0 : lpush(append(new Constant(new LongConstant ( 0)))); break; 2684 case Bytecodes::_lconst_1 : lpush(append(new Constant(new LongConstant ( 1)))); break; 2685 case Bytecodes::_fconst_0 : fpush(append(new Constant(new FloatConstant ( 0)))); break; 2686 case Bytecodes::_fconst_1 : fpush(append(new Constant(new FloatConstant ( 1)))); break; 2687 case Bytecodes::_fconst_2 : fpush(append(new Constant(new FloatConstant ( 2)))); break; 2688 case Bytecodes::_dconst_0 : dpush(append(new Constant(new DoubleConstant( 0)))); break; 2689 case Bytecodes::_dconst_1 : dpush(append(new Constant(new DoubleConstant( 1)))); break; 2690 case Bytecodes::_bipush : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break; 2691 case Bytecodes::_sipush : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break; 2692 case Bytecodes::_ldc : // fall through 2693 case Bytecodes::_ldc_w : // fall through 2694 case Bytecodes::_ldc2_w : load_constant(); break; 2695 case Bytecodes::_iload : load_local(intType , s.get_index()); break; 2696 case Bytecodes::_lload : load_local(longType , s.get_index()); break; 2697 case Bytecodes::_fload : load_local(floatType , s.get_index()); break; 2698 case Bytecodes::_dload : load_local(doubleType , s.get_index()); break; 2699 case Bytecodes::_aload : load_local(instanceType, s.get_index()); break; 2700 case Bytecodes::_iload_0 : load_local(intType , 0); break; 2701 case Bytecodes::_iload_1 : load_local(intType , 1); break; 2702 case Bytecodes::_iload_2 : load_local(intType , 2); break; 2703 case Bytecodes::_iload_3 : load_local(intType , 3); break; 2704 case Bytecodes::_lload_0 : load_local(longType , 0); break; 2705 case Bytecodes::_lload_1 : load_local(longType , 1); break; 2706 case Bytecodes::_lload_2 : load_local(longType , 2); break; 2707 case Bytecodes::_lload_3 : load_local(longType , 3); break; 2708 case Bytecodes::_fload_0 : load_local(floatType , 0); break; 2709 case Bytecodes::_fload_1 : load_local(floatType , 1); break; 2710 case Bytecodes::_fload_2 : load_local(floatType , 2); break; 2711 case Bytecodes::_fload_3 : load_local(floatType , 3); break; 2712 case Bytecodes::_dload_0 : load_local(doubleType, 0); break; 2713 case Bytecodes::_dload_1 : load_local(doubleType, 1); break; 2714 case Bytecodes::_dload_2 : load_local(doubleType, 2); break; 2715 case Bytecodes::_dload_3 : load_local(doubleType, 3); break; 2716 case Bytecodes::_aload_0 : load_local(objectType, 0); break; 2717 case Bytecodes::_aload_1 : load_local(objectType, 1); break; 2718 case Bytecodes::_aload_2 : load_local(objectType, 2); break; 2719 case Bytecodes::_aload_3 : load_local(objectType, 3); break; 2720 case Bytecodes::_iaload : load_indexed(T_INT ); break; 2721 case Bytecodes::_laload : load_indexed(T_LONG ); break; 2722 case Bytecodes::_faload : load_indexed(T_FLOAT ); break; 2723 case Bytecodes::_daload : load_indexed(T_DOUBLE); break; 2724 case Bytecodes::_aaload : load_indexed(T_OBJECT); break; 2725 case Bytecodes::_baload : load_indexed(T_BYTE ); break; 2726 case Bytecodes::_caload : load_indexed(T_CHAR ); break; 2727 case Bytecodes::_saload : load_indexed(T_SHORT ); break; 2728 case Bytecodes::_istore : store_local(intType , s.get_index()); break; 2729 case Bytecodes::_lstore : store_local(longType , s.get_index()); break; 2730 case Bytecodes::_fstore : store_local(floatType , s.get_index()); break; 2731 case Bytecodes::_dstore : store_local(doubleType, s.get_index()); break; 2732 case Bytecodes::_astore : store_local(objectType, s.get_index()); break; 2733 case Bytecodes::_istore_0 : store_local(intType , 0); break; 2734 case Bytecodes::_istore_1 : store_local(intType , 1); break; 2735 case Bytecodes::_istore_2 : store_local(intType , 2); break; 2736 case Bytecodes::_istore_3 : store_local(intType , 3); break; 2737 case Bytecodes::_lstore_0 : store_local(longType , 0); break; 2738 case Bytecodes::_lstore_1 : store_local(longType , 1); break; 2739 case Bytecodes::_lstore_2 : store_local(longType , 2); break; 2740 case Bytecodes::_lstore_3 : store_local(longType , 3); break; 2741 case Bytecodes::_fstore_0 : store_local(floatType , 0); break; 2742 case Bytecodes::_fstore_1 : store_local(floatType , 1); break; 2743 case Bytecodes::_fstore_2 : store_local(floatType , 2); break; 2744 case Bytecodes::_fstore_3 : store_local(floatType , 3); break; 2745 case Bytecodes::_dstore_0 : store_local(doubleType, 0); break; 2746 case Bytecodes::_dstore_1 : store_local(doubleType, 1); break; 2747 case Bytecodes::_dstore_2 : store_local(doubleType, 2); break; 2748 case Bytecodes::_dstore_3 : store_local(doubleType, 3); break; 2749 case Bytecodes::_astore_0 : store_local(objectType, 0); break; 2750 case Bytecodes::_astore_1 : store_local(objectType, 1); break; 2751 case Bytecodes::_astore_2 : store_local(objectType, 2); break; 2752 case Bytecodes::_astore_3 : store_local(objectType, 3); break; 2753 case Bytecodes::_iastore : store_indexed(T_INT ); break; 2754 case Bytecodes::_lastore : store_indexed(T_LONG ); break; 2755 case Bytecodes::_fastore : store_indexed(T_FLOAT ); break; 2756 case Bytecodes::_dastore : store_indexed(T_DOUBLE); break; 2757 case Bytecodes::_aastore : store_indexed(T_OBJECT); break; 2758 case Bytecodes::_bastore : store_indexed(T_BYTE ); break; 2759 case Bytecodes::_castore : store_indexed(T_CHAR ); break; 2760 case Bytecodes::_sastore : store_indexed(T_SHORT ); break; 2761 case Bytecodes::_pop : // fall through 2762 case Bytecodes::_pop2 : // fall through 2763 case Bytecodes::_dup : // fall through 2764 case Bytecodes::_dup_x1 : // fall through 2765 case Bytecodes::_dup_x2 : // fall through 2766 case Bytecodes::_dup2 : // fall through 2767 case Bytecodes::_dup2_x1 : // fall through 2768 case Bytecodes::_dup2_x2 : // fall through 2769 case Bytecodes::_swap : stack_op(code); break; 2770 case Bytecodes::_iadd : arithmetic_op(intType , code); break; 2771 case Bytecodes::_ladd : arithmetic_op(longType , code); break; 2772 case Bytecodes::_fadd : arithmetic_op(floatType , code); break; 2773 case Bytecodes::_dadd : arithmetic_op(doubleType, code); break; 2774 case Bytecodes::_isub : arithmetic_op(intType , code); break; 2775 case Bytecodes::_lsub : arithmetic_op(longType , code); break; 2776 case Bytecodes::_fsub : arithmetic_op(floatType , code); break; 2777 case Bytecodes::_dsub : arithmetic_op(doubleType, code); break; 2778 case Bytecodes::_imul : arithmetic_op(intType , code); break; 2779 case Bytecodes::_lmul : arithmetic_op(longType , code); break; 2780 case Bytecodes::_fmul : arithmetic_op(floatType , code); break; 2781 case Bytecodes::_dmul : arithmetic_op(doubleType, code); break; 2782 case Bytecodes::_idiv : arithmetic_op(intType , code, copy_state_for_exception()); break; 2783 case Bytecodes::_ldiv : arithmetic_op(longType , code, copy_state_for_exception()); break; 2784 case Bytecodes::_fdiv : arithmetic_op(floatType , code); break; 2785 case Bytecodes::_ddiv : arithmetic_op(doubleType, code); break; 2786 case Bytecodes::_irem : arithmetic_op(intType , code, copy_state_for_exception()); break; 2787 case Bytecodes::_lrem : arithmetic_op(longType , code, copy_state_for_exception()); break; 2788 case Bytecodes::_frem : arithmetic_op(floatType , code); break; 2789 case Bytecodes::_drem : arithmetic_op(doubleType, code); break; 2790 case Bytecodes::_ineg : negate_op(intType ); break; 2791 case Bytecodes::_lneg : negate_op(longType ); break; 2792 case Bytecodes::_fneg : negate_op(floatType ); break; 2793 case Bytecodes::_dneg : negate_op(doubleType); break; 2794 case Bytecodes::_ishl : shift_op(intType , code); break; 2795 case Bytecodes::_lshl : shift_op(longType, code); break; 2796 case Bytecodes::_ishr : shift_op(intType , code); break; 2797 case Bytecodes::_lshr : shift_op(longType, code); break; 2798 case Bytecodes::_iushr : shift_op(intType , code); break; 2799 case Bytecodes::_lushr : shift_op(longType, code); break; 2800 case Bytecodes::_iand : logic_op(intType , code); break; 2801 case Bytecodes::_land : logic_op(longType, code); break; 2802 case Bytecodes::_ior : logic_op(intType , code); break; 2803 case Bytecodes::_lor : logic_op(longType, code); break; 2804 case Bytecodes::_ixor : logic_op(intType , code); break; 2805 case Bytecodes::_lxor : logic_op(longType, code); break; 2806 case Bytecodes::_iinc : increment(); break; 2807 case Bytecodes::_i2l : convert(code, T_INT , T_LONG ); break; 2808 case Bytecodes::_i2f : convert(code, T_INT , T_FLOAT ); break; 2809 case Bytecodes::_i2d : convert(code, T_INT , T_DOUBLE); break; 2810 case Bytecodes::_l2i : convert(code, T_LONG , T_INT ); break; 2811 case Bytecodes::_l2f : convert(code, T_LONG , T_FLOAT ); break; 2812 case Bytecodes::_l2d : convert(code, T_LONG , T_DOUBLE); break; 2813 case Bytecodes::_f2i : convert(code, T_FLOAT , T_INT ); break; 2814 case Bytecodes::_f2l : convert(code, T_FLOAT , T_LONG ); break; 2815 case Bytecodes::_f2d : convert(code, T_FLOAT , T_DOUBLE); break; 2816 case Bytecodes::_d2i : convert(code, T_DOUBLE, T_INT ); break; 2817 case Bytecodes::_d2l : convert(code, T_DOUBLE, T_LONG ); break; 2818 case Bytecodes::_d2f : convert(code, T_DOUBLE, T_FLOAT ); break; 2819 case Bytecodes::_i2b : convert(code, T_INT , T_BYTE ); break; 2820 case Bytecodes::_i2c : convert(code, T_INT , T_CHAR ); break; 2821 case Bytecodes::_i2s : convert(code, T_INT , T_SHORT ); break; 2822 case Bytecodes::_lcmp : compare_op(longType , code); break; 2823 case Bytecodes::_fcmpl : compare_op(floatType , code); break; 2824 case Bytecodes::_fcmpg : compare_op(floatType , code); break; 2825 case Bytecodes::_dcmpl : compare_op(doubleType, code); break; 2826 case Bytecodes::_dcmpg : compare_op(doubleType, code); break; 2827 case Bytecodes::_ifeq : if_zero(intType , If::eql); break; 2828 case Bytecodes::_ifne : if_zero(intType , If::neq); break; 2829 case Bytecodes::_iflt : if_zero(intType , If::lss); break; 2830 case Bytecodes::_ifge : if_zero(intType , If::geq); break; 2831 case Bytecodes::_ifgt : if_zero(intType , If::gtr); break; 2832 case Bytecodes::_ifle : if_zero(intType , If::leq); break; 2833 case Bytecodes::_if_icmpeq : if_same(intType , If::eql); break; 2834 case Bytecodes::_if_icmpne : if_same(intType , If::neq); break; 2835 case Bytecodes::_if_icmplt : if_same(intType , If::lss); break; 2836 case Bytecodes::_if_icmpge : if_same(intType , If::geq); break; 2837 case Bytecodes::_if_icmpgt : if_same(intType , If::gtr); break; 2838 case Bytecodes::_if_icmple : if_same(intType , If::leq); break; 2839 case Bytecodes::_if_acmpeq : if_same(objectType, If::eql); break; 2840 case Bytecodes::_if_acmpne : if_same(objectType, If::neq); break; 2841 case Bytecodes::_goto : _goto(s.cur_bci(), s.get_dest()); break; 2842 case Bytecodes::_jsr : jsr(s.get_dest()); break; 2843 case Bytecodes::_ret : ret(s.get_index()); break; 2844 case Bytecodes::_tableswitch : table_switch(); break; 2845 case Bytecodes::_lookupswitch : lookup_switch(); break; 2846 case Bytecodes::_ireturn : method_return(ipop(), ignore_return); break; 2847 case Bytecodes::_lreturn : method_return(lpop(), ignore_return); break; 2848 case Bytecodes::_freturn : method_return(fpop(), ignore_return); break; 2849 case Bytecodes::_dreturn : method_return(dpop(), ignore_return); break; 2850 case Bytecodes::_areturn : method_return(apop(), ignore_return); break; 2851 case Bytecodes::_return : method_return(NULL , ignore_return); break; 2852 case Bytecodes::_getstatic : // fall through 2853 case Bytecodes::_putstatic : // fall through 2854 case Bytecodes::_getfield : // fall through 2855 case Bytecodes::_putfield : access_field(code); break; 2856 case Bytecodes::_invokevirtual : // fall through 2857 case Bytecodes::_invokespecial : // fall through 2858 case Bytecodes::_invokestatic : // fall through 2859 case Bytecodes::_invokedynamic : // fall through 2860 case Bytecodes::_invokeinterface: invoke(code); break; 2861 case Bytecodes::_new : new_instance(s.get_index_u2()); break; 2862 case Bytecodes::_newarray : new_type_array(); break; 2863 case Bytecodes::_anewarray : new_object_array(); break; 2864 case Bytecodes::_arraylength : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; } 2865 case Bytecodes::_athrow : throw_op(s.cur_bci()); break; 2866 case Bytecodes::_checkcast : check_cast(s.get_index_u2()); break; 2867 case Bytecodes::_instanceof : instance_of(s.get_index_u2()); break; 2868 case Bytecodes::_monitorenter : monitorenter(apop(), s.cur_bci()); break; 2869 case Bytecodes::_monitorexit : monitorexit (apop(), s.cur_bci()); break; 2870 case Bytecodes::_wide : ShouldNotReachHere(); break; 2871 case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break; 2872 case Bytecodes::_ifnull : if_null(objectType, If::eql); break; 2873 case Bytecodes::_ifnonnull : if_null(objectType, If::neq); break; 2874 case Bytecodes::_goto_w : _goto(s.cur_bci(), s.get_far_dest()); break; 2875 case Bytecodes::_jsr_w : jsr(s.get_far_dest()); break; 2876 case Bytecodes::_breakpoint : BAILOUT_("concurrent setting of breakpoint", NULL); 2877 default : ShouldNotReachHere(); break; 2878 } 2879 2880 if (log != NULL) 2881 log->clear_context(); // skip marker if nothing was printed 2882 2883 // save current bci to setup Goto at the end 2884 prev_bci = s.cur_bci(); 2885 2886 } 2887 CHECK_BAILOUT_(NULL); 2888 // stop processing of this block (see try_inline_full) 2889 if (_skip_block) { 2890 _skip_block = false; 2891 assert(_last && _last->as_BlockEnd(), ""); 2892 return _last->as_BlockEnd(); 2893 } 2894 // if there are any, check if last instruction is a BlockEnd instruction 2895 BlockEnd* end = last()->as_BlockEnd(); 2896 if (end == NULL) { 2897 // all blocks must end with a BlockEnd instruction => add a Goto 2898 end = new Goto(block_at(s.cur_bci()), false); 2899 append(end); 2900 } 2901 assert(end == last()->as_BlockEnd(), "inconsistency"); 2902 2903 assert(end->state() != NULL, "state must already be present"); 2904 assert(end->as_Return() == NULL || end->as_Throw() == NULL || end->state()->stack_size() == 0, "stack not needed for return and throw"); 2905 2906 // connect to begin & set state 2907 // NOTE that inlining may have changed the block we are parsing 2908 block()->set_end(end); 2909 // propagate state 2910 for (int i = end->number_of_sux() - 1; i >= 0; i--) { 2911 BlockBegin* sux = end->sux_at(i); 2912 assert(sux->is_predecessor(block()), "predecessor missing"); 2913 // be careful, bailout if bytecodes are strange 2914 if (!sux->try_merge(end->state())) BAILOUT_("block join failed", NULL); 2915 scope_data()->add_to_work_list(end->sux_at(i)); 2916 } 2917 2918 scope_data()->set_stream(NULL); 2919 2920 // done 2921 return end; 2922 } 2923 2924 2925 void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) { 2926 do { 2927 if (start_in_current_block_for_inlining && !bailed_out()) { 2928 iterate_bytecodes_for_block(0); 2929 start_in_current_block_for_inlining = false; 2930 } else { 2931 BlockBegin* b; 2932 while ((b = scope_data()->remove_from_work_list()) != NULL) { 2933 if (!b->is_set(BlockBegin::was_visited_flag)) { 2934 if (b->is_set(BlockBegin::osr_entry_flag)) { 2935 // we're about to parse the osr entry block, so make sure 2936 // we setup the OSR edge leading into this block so that 2937 // Phis get setup correctly. 2938 setup_osr_entry_block(); 2939 // this is no longer the osr entry block, so clear it. 2940 b->clear(BlockBegin::osr_entry_flag); 2941 } 2942 b->set(BlockBegin::was_visited_flag); 2943 connect_to_end(b); 2944 } 2945 } 2946 } 2947 } while (!bailed_out() && !scope_data()->is_work_list_empty()); 2948 } 2949 2950 2951 bool GraphBuilder::_can_trap [Bytecodes::number_of_java_codes]; 2952 2953 void GraphBuilder::initialize() { 2954 // the following bytecodes are assumed to potentially 2955 // throw exceptions in compiled code - note that e.g. 2956 // monitorexit & the return bytecodes do not throw 2957 // exceptions since monitor pairing proved that they 2958 // succeed (if monitor pairing succeeded) 2959 Bytecodes::Code can_trap_list[] = 2960 { Bytecodes::_ldc 2961 , Bytecodes::_ldc_w 2962 , Bytecodes::_ldc2_w 2963 , Bytecodes::_iaload 2964 , Bytecodes::_laload 2965 , Bytecodes::_faload 2966 , Bytecodes::_daload 2967 , Bytecodes::_aaload 2968 , Bytecodes::_baload 2969 , Bytecodes::_caload 2970 , Bytecodes::_saload 2971 , Bytecodes::_iastore 2972 , Bytecodes::_lastore 2973 , Bytecodes::_fastore 2974 , Bytecodes::_dastore 2975 , Bytecodes::_aastore 2976 , Bytecodes::_bastore 2977 , Bytecodes::_castore 2978 , Bytecodes::_sastore 2979 , Bytecodes::_idiv 2980 , Bytecodes::_ldiv 2981 , Bytecodes::_irem 2982 , Bytecodes::_lrem 2983 , Bytecodes::_getstatic 2984 , Bytecodes::_putstatic 2985 , Bytecodes::_getfield 2986 , Bytecodes::_putfield 2987 , Bytecodes::_invokevirtual 2988 , Bytecodes::_invokespecial 2989 , Bytecodes::_invokestatic 2990 , Bytecodes::_invokedynamic 2991 , Bytecodes::_invokeinterface 2992 , Bytecodes::_new 2993 , Bytecodes::_newarray 2994 , Bytecodes::_anewarray 2995 , Bytecodes::_arraylength 2996 , Bytecodes::_athrow 2997 , Bytecodes::_checkcast 2998 , Bytecodes::_instanceof 2999 , Bytecodes::_monitorenter 3000 , Bytecodes::_multianewarray 3001 }; 3002 3003 // inititialize trap tables 3004 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { 3005 _can_trap[i] = false; 3006 } 3007 // set standard trap info 3008 for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) { 3009 _can_trap[can_trap_list[j]] = true; 3010 } 3011 } 3012 3013 3014 BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) { 3015 assert(entry->is_set(f), "entry/flag mismatch"); 3016 // create header block 3017 BlockBegin* h = new BlockBegin(entry->bci()); 3018 h->set_depth_first_number(0); 3019 3020 Value l = h; 3021 BlockEnd* g = new Goto(entry, false); 3022 l->set_next(g, entry->bci()); 3023 h->set_end(g); 3024 h->set(f); 3025 // setup header block end state 3026 ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis) 3027 assert(s->stack_is_empty(), "must have empty stack at entry point"); 3028 g->set_state(s); 3029 return h; 3030 } 3031 3032 3033 3034 BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) { 3035 BlockBegin* start = new BlockBegin(0); 3036 3037 // This code eliminates the empty start block at the beginning of 3038 // each method. Previously, each method started with the 3039 // start-block created below, and this block was followed by the 3040 // header block that was always empty. This header block is only 3041 // necesary if std_entry is also a backward branch target because 3042 // then phi functions may be necessary in the header block. It's 3043 // also necessary when profiling so that there's a single block that 3044 // can increment the interpreter_invocation_count. 3045 BlockBegin* new_header_block; 3046 if (std_entry->number_of_preds() > 0 || count_invocations() || count_backedges()) { 3047 new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state); 3048 } else { 3049 new_header_block = std_entry; 3050 } 3051 3052 // setup start block (root for the IR graph) 3053 Base* base = 3054 new Base( 3055 new_header_block, 3056 osr_entry 3057 ); 3058 start->set_next(base, 0); 3059 start->set_end(base); 3060 // create & setup state for start block 3061 start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci())); 3062 base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci())); 3063 3064 if (base->std_entry()->state() == NULL) { 3065 // setup states for header blocks 3066 base->std_entry()->merge(state); 3067 } 3068 3069 assert(base->std_entry()->state() != NULL, ""); 3070 return start; 3071 } 3072 3073 3074 void GraphBuilder::setup_osr_entry_block() { 3075 assert(compilation()->is_osr_compile(), "only for osrs"); 3076 3077 int osr_bci = compilation()->osr_bci(); 3078 ciBytecodeStream s(method()); 3079 s.reset_to_bci(osr_bci); 3080 s.next(); 3081 scope_data()->set_stream(&s); 3082 3083 // create a new block to be the osr setup code 3084 _osr_entry = new BlockBegin(osr_bci); 3085 _osr_entry->set(BlockBegin::osr_entry_flag); 3086 _osr_entry->set_depth_first_number(0); 3087 BlockBegin* target = bci2block()->at(osr_bci); 3088 assert(target != NULL && target->is_set(BlockBegin::osr_entry_flag), "must be there"); 3089 // the osr entry has no values for locals 3090 ValueStack* state = target->state()->copy(); 3091 _osr_entry->set_state(state); 3092 3093 kill_all(); 3094 _block = _osr_entry; 3095 _state = _osr_entry->state()->copy(); 3096 assert(_state->bci() == osr_bci, "mismatch"); 3097 _last = _osr_entry; 3098 Value e = append(new OsrEntry()); 3099 e->set_needs_null_check(false); 3100 3101 // OSR buffer is 3102 // 3103 // locals[nlocals-1..0] 3104 // monitors[number_of_locks-1..0] 3105 // 3106 // locals is a direct copy of the interpreter frame so in the osr buffer 3107 // so first slot in the local array is the last local from the interpreter 3108 // and last slot is local[0] (receiver) from the interpreter 3109 // 3110 // Similarly with locks. The first lock slot in the osr buffer is the nth lock 3111 // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock 3112 // in the interpreter frame (the method lock if a sync method) 3113 3114 // Initialize monitors in the compiled activation. 3115 3116 int index; 3117 Value local; 3118 3119 // find all the locals that the interpreter thinks contain live oops 3120 const ResourceBitMap live_oops = method()->live_local_oops_at_bci(osr_bci); 3121 3122 // compute the offset into the locals so that we can treat the buffer 3123 // as if the locals were still in the interpreter frame 3124 int locals_offset = BytesPerWord * (method()->max_locals() - 1); 3125 for_each_local_value(state, index, local) { 3126 int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord; 3127 Value get; 3128 if (local->type()->is_object_kind() && !live_oops.at(index)) { 3129 // The interpreter thinks this local is dead but the compiler 3130 // doesn't so pretend that the interpreter passed in null. 3131 get = append(new Constant(objectNull)); 3132 } else { 3133 get = append(new UnsafeGetRaw(as_BasicType(local->type()), e, 3134 append(new Constant(new IntConstant(offset))), 3135 0, 3136 true /*unaligned*/, true /*wide*/)); 3137 } 3138 _state->store_local(index, get); 3139 } 3140 3141 // the storage for the OSR buffer is freed manually in the LIRGenerator. 3142 3143 assert(state->caller_state() == NULL, "should be top scope"); 3144 state->clear_locals(); 3145 Goto* g = new Goto(target, false); 3146 append(g); 3147 _osr_entry->set_end(g); 3148 target->merge(_osr_entry->end()->state()); 3149 3150 scope_data()->set_stream(NULL); 3151 } 3152 3153 3154 ValueStack* GraphBuilder::state_at_entry() { 3155 ValueStack* state = new ValueStack(scope(), NULL); 3156 3157 // Set up locals for receiver 3158 int idx = 0; 3159 if (!method()->is_static()) { 3160 // we should always see the receiver 3161 state->store_local(idx, new Local(method()->holder(), objectType, idx, true)); 3162 idx = 1; 3163 } 3164 3165 // Set up locals for incoming arguments 3166 ciSignature* sig = method()->signature(); 3167 for (int i = 0; i < sig->count(); i++) { 3168 ciType* type = sig->type_at(i); 3169 BasicType basic_type = type->basic_type(); 3170 // don't allow T_ARRAY to propagate into locals types 3171 if (basic_type == T_ARRAY) basic_type = T_OBJECT; 3172 ValueType* vt = as_ValueType(basic_type); 3173 state->store_local(idx, new Local(type, vt, idx, false)); 3174 idx += type->size(); 3175 } 3176 3177 // lock synchronized method 3178 if (method()->is_synchronized()) { 3179 state->lock(NULL); 3180 } 3181 3182 return state; 3183 } 3184 3185 3186 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope) 3187 : _scope_data(NULL) 3188 , _compilation(compilation) 3189 , _memory(new MemoryBuffer()) 3190 , _inline_bailout_msg(NULL) 3191 , _instruction_count(0) 3192 , _osr_entry(NULL) 3193 { 3194 int osr_bci = compilation->osr_bci(); 3195 3196 // determine entry points and bci2block mapping 3197 BlockListBuilder blm(compilation, scope, osr_bci); 3198 CHECK_BAILOUT(); 3199 3200 BlockList* bci2block = blm.bci2block(); 3201 BlockBegin* start_block = bci2block->at(0); 3202 3203 push_root_scope(scope, bci2block, start_block); 3204 3205 // setup state for std entry 3206 _initial_state = state_at_entry(); 3207 start_block->merge(_initial_state); 3208 3209 // complete graph 3210 _vmap = new ValueMap(); 3211 switch (scope->method()->intrinsic_id()) { 3212 case vmIntrinsics::_dabs : // fall through 3213 case vmIntrinsics::_dsqrt : // fall through 3214 case vmIntrinsics::_dsin : // fall through 3215 case vmIntrinsics::_dcos : // fall through 3216 case vmIntrinsics::_dtan : // fall through 3217 case vmIntrinsics::_dlog : // fall through 3218 case vmIntrinsics::_dlog10 : // fall through 3219 case vmIntrinsics::_dexp : // fall through 3220 case vmIntrinsics::_dpow : // fall through 3221 { 3222 // Compiles where the root method is an intrinsic need a special 3223 // compilation environment because the bytecodes for the method 3224 // shouldn't be parsed during the compilation, only the special 3225 // Intrinsic node should be emitted. If this isn't done the the 3226 // code for the inlined version will be different than the root 3227 // compiled version which could lead to monotonicity problems on 3228 // intel. 3229 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) { 3230 BAILOUT("failed to inline intrinsic, method not annotated"); 3231 } 3232 3233 // Set up a stream so that appending instructions works properly. 3234 ciBytecodeStream s(scope->method()); 3235 s.reset_to_bci(0); 3236 scope_data()->set_stream(&s); 3237 s.next(); 3238 3239 // setup the initial block state 3240 _block = start_block; 3241 _state = start_block->state()->copy_for_parsing(); 3242 _last = start_block; 3243 load_local(doubleType, 0); 3244 if (scope->method()->intrinsic_id() == vmIntrinsics::_dpow) { 3245 load_local(doubleType, 2); 3246 } 3247 3248 // Emit the intrinsic node. 3249 bool result = try_inline_intrinsics(scope->method()); 3250 if (!result) BAILOUT("failed to inline intrinsic"); 3251 method_return(dpop()); 3252 3253 // connect the begin and end blocks and we're all done. 3254 BlockEnd* end = last()->as_BlockEnd(); 3255 block()->set_end(end); 3256 break; 3257 } 3258 3259 case vmIntrinsics::_Reference_get: 3260 { 3261 { 3262 // With java.lang.ref.reference.get() we must go through the 3263 // intrinsic - when G1 is enabled - even when get() is the root 3264 // method of the compile so that, if necessary, the value in 3265 // the referent field of the reference object gets recorded by 3266 // the pre-barrier code. 3267 // Specifically, if G1 is enabled, the value in the referent 3268 // field is recorded by the G1 SATB pre barrier. This will 3269 // result in the referent being marked live and the reference 3270 // object removed from the list of discovered references during 3271 // reference processing. 3272 if (CheckIntrinsics && !scope->method()->intrinsic_candidate()) { 3273 BAILOUT("failed to inline intrinsic, method not annotated"); 3274 } 3275 3276 // Also we need intrinsic to prevent commoning reads from this field 3277 // across safepoint since GC can change its value. 3278 3279 // Set up a stream so that appending instructions works properly. 3280 ciBytecodeStream s(scope->method()); 3281 s.reset_to_bci(0); 3282 scope_data()->set_stream(&s); 3283 s.next(); 3284 3285 // setup the initial block state 3286 _block = start_block; 3287 _state = start_block->state()->copy_for_parsing(); 3288 _last = start_block; 3289 load_local(objectType, 0); 3290 3291 // Emit the intrinsic node. 3292 bool result = try_inline_intrinsics(scope->method()); 3293 if (!result) BAILOUT("failed to inline intrinsic"); 3294 method_return(apop()); 3295 3296 // connect the begin and end blocks and we're all done. 3297 BlockEnd* end = last()->as_BlockEnd(); 3298 block()->set_end(end); 3299 break; 3300 } 3301 // Otherwise, fall thru 3302 } 3303 3304 default: 3305 scope_data()->add_to_work_list(start_block); 3306 iterate_all_blocks(); 3307 break; 3308 } 3309 CHECK_BAILOUT(); 3310 3311 _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state); 3312 3313 eliminate_redundant_phis(_start); 3314 3315 NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats()); 3316 // for osr compile, bailout if some requirements are not fulfilled 3317 if (osr_bci != -1) { 3318 BlockBegin* osr_block = blm.bci2block()->at(osr_bci); 3319 if (!osr_block->is_set(BlockBegin::was_visited_flag)) { 3320 BAILOUT("osr entry must have been visited for osr compile"); 3321 } 3322 3323 // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points 3324 if (!osr_block->state()->stack_is_empty()) { 3325 BAILOUT("stack not empty at OSR entry point"); 3326 } 3327 } 3328 #ifndef PRODUCT 3329 if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count); 3330 #endif 3331 } 3332 3333 3334 ValueStack* GraphBuilder::copy_state_before() { 3335 return copy_state_before_with_bci(bci()); 3336 } 3337 3338 ValueStack* GraphBuilder::copy_state_exhandling() { 3339 return copy_state_exhandling_with_bci(bci()); 3340 } 3341 3342 ValueStack* GraphBuilder::copy_state_for_exception() { 3343 return copy_state_for_exception_with_bci(bci()); 3344 } 3345 3346 ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) { 3347 return state()->copy(ValueStack::StateBefore, bci); 3348 } 3349 3350 ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) { 3351 if (!has_handler()) return NULL; 3352 return state()->copy(ValueStack::StateBefore, bci); 3353 } 3354 3355 ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) { 3356 ValueStack* s = copy_state_exhandling_with_bci(bci); 3357 if (s == NULL) { 3358 if (_compilation->env()->should_retain_local_variables()) { 3359 s = state()->copy(ValueStack::ExceptionState, bci); 3360 } else { 3361 s = state()->copy(ValueStack::EmptyExceptionState, bci); 3362 } 3363 } 3364 return s; 3365 } 3366 3367 int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const { 3368 int recur_level = 0; 3369 for (IRScope* s = scope(); s != NULL; s = s->caller()) { 3370 if (s->method() == cur_callee) { 3371 ++recur_level; 3372 } 3373 } 3374 return recur_level; 3375 } 3376 3377 3378 bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) { 3379 const char* msg = NULL; 3380 3381 // clear out any existing inline bailout condition 3382 clear_inline_bailout(); 3383 3384 // exclude methods we don't want to inline 3385 msg = should_not_inline(callee); 3386 if (msg != NULL) { 3387 print_inlining(callee, msg, /*success*/ false); 3388 return false; 3389 } 3390 3391 // method handle invokes 3392 if (callee->is_method_handle_intrinsic()) { 3393 if (try_method_handle_inline(callee, ignore_return)) { 3394 if (callee->has_reserved_stack_access()) { 3395 compilation()->set_has_reserved_stack_access(true); 3396 } 3397 return true; 3398 } 3399 return false; 3400 } 3401 3402 // handle intrinsics 3403 if (callee->intrinsic_id() != vmIntrinsics::_none && 3404 (CheckIntrinsics ? callee->intrinsic_candidate() : true)) { 3405 if (try_inline_intrinsics(callee, ignore_return)) { 3406 print_inlining(callee, "intrinsic"); 3407 if (callee->has_reserved_stack_access()) { 3408 compilation()->set_has_reserved_stack_access(true); 3409 } 3410 return true; 3411 } 3412 // try normal inlining 3413 } 3414 3415 // certain methods cannot be parsed at all 3416 msg = check_can_parse(callee); 3417 if (msg != NULL) { 3418 print_inlining(callee, msg, /*success*/ false); 3419 return false; 3420 } 3421 3422 // If bytecode not set use the current one. 3423 if (bc == Bytecodes::_illegal) { 3424 bc = code(); 3425 } 3426 if (try_inline_full(callee, holder_known, ignore_return, bc, receiver)) { 3427 if (callee->has_reserved_stack_access()) { 3428 compilation()->set_has_reserved_stack_access(true); 3429 } 3430 return true; 3431 } 3432 3433 // Entire compilation could fail during try_inline_full call. 3434 // In that case printing inlining decision info is useless. 3435 if (!bailed_out()) 3436 print_inlining(callee, _inline_bailout_msg, /*success*/ false); 3437 3438 return false; 3439 } 3440 3441 3442 const char* GraphBuilder::check_can_parse(ciMethod* callee) const { 3443 // Certain methods cannot be parsed at all: 3444 if ( callee->is_native()) return "native method"; 3445 if ( callee->is_abstract()) return "abstract method"; 3446 if (!callee->can_be_compiled()) return "not compilable (disabled)"; 3447 if (!callee->can_be_parsed()) return "cannot be parsed"; 3448 return NULL; 3449 } 3450 3451 // negative filter: should callee NOT be inlined? returns NULL, ok to inline, or rejection msg 3452 const char* GraphBuilder::should_not_inline(ciMethod* callee) const { 3453 if ( compilation()->directive()->should_not_inline(callee)) return "disallowed by CompileCommand"; 3454 if ( callee->dont_inline()) return "don't inline by annotation"; 3455 return NULL; 3456 } 3457 3458 void GraphBuilder::build_graph_for_intrinsic(ciMethod* callee, bool ignore_return) { 3459 vmIntrinsics::ID id = callee->intrinsic_id(); 3460 assert(id != vmIntrinsics::_none, "must be a VM intrinsic"); 3461 3462 // Some intrinsics need special IR nodes. 3463 switch(id) { 3464 case vmIntrinsics::_getReference : append_unsafe_get_obj(callee, T_OBJECT, false); return; 3465 case vmIntrinsics::_getBoolean : append_unsafe_get_obj(callee, T_BOOLEAN, false); return; 3466 case vmIntrinsics::_getByte : append_unsafe_get_obj(callee, T_BYTE, false); return; 3467 case vmIntrinsics::_getShort : append_unsafe_get_obj(callee, T_SHORT, false); return; 3468 case vmIntrinsics::_getChar : append_unsafe_get_obj(callee, T_CHAR, false); return; 3469 case vmIntrinsics::_getInt : append_unsafe_get_obj(callee, T_INT, false); return; 3470 case vmIntrinsics::_getLong : append_unsafe_get_obj(callee, T_LONG, false); return; 3471 case vmIntrinsics::_getFloat : append_unsafe_get_obj(callee, T_FLOAT, false); return; 3472 case vmIntrinsics::_getDouble : append_unsafe_get_obj(callee, T_DOUBLE, false); return; 3473 case vmIntrinsics::_putReference : append_unsafe_put_obj(callee, T_OBJECT, false); return; 3474 case vmIntrinsics::_putBoolean : append_unsafe_put_obj(callee, T_BOOLEAN, false); return; 3475 case vmIntrinsics::_putByte : append_unsafe_put_obj(callee, T_BYTE, false); return; 3476 case vmIntrinsics::_putShort : append_unsafe_put_obj(callee, T_SHORT, false); return; 3477 case vmIntrinsics::_putChar : append_unsafe_put_obj(callee, T_CHAR, false); return; 3478 case vmIntrinsics::_putInt : append_unsafe_put_obj(callee, T_INT, false); return; 3479 case vmIntrinsics::_putLong : append_unsafe_put_obj(callee, T_LONG, false); return; 3480 case vmIntrinsics::_putFloat : append_unsafe_put_obj(callee, T_FLOAT, false); return; 3481 case vmIntrinsics::_putDouble : append_unsafe_put_obj(callee, T_DOUBLE, false); return; 3482 case vmIntrinsics::_getShortUnaligned : append_unsafe_get_obj(callee, T_SHORT, false); return; 3483 case vmIntrinsics::_getCharUnaligned : append_unsafe_get_obj(callee, T_CHAR, false); return; 3484 case vmIntrinsics::_getIntUnaligned : append_unsafe_get_obj(callee, T_INT, false); return; 3485 case vmIntrinsics::_getLongUnaligned : append_unsafe_get_obj(callee, T_LONG, false); return; 3486 case vmIntrinsics::_putShortUnaligned : append_unsafe_put_obj(callee, T_SHORT, false); return; 3487 case vmIntrinsics::_putCharUnaligned : append_unsafe_put_obj(callee, T_CHAR, false); return; 3488 case vmIntrinsics::_putIntUnaligned : append_unsafe_put_obj(callee, T_INT, false); return; 3489 case vmIntrinsics::_putLongUnaligned : append_unsafe_put_obj(callee, T_LONG, false); return; 3490 case vmIntrinsics::_getReferenceVolatile : append_unsafe_get_obj(callee, T_OBJECT, true); return; 3491 case vmIntrinsics::_getBooleanVolatile : append_unsafe_get_obj(callee, T_BOOLEAN, true); return; 3492 case vmIntrinsics::_getByteVolatile : append_unsafe_get_obj(callee, T_BYTE, true); return; 3493 case vmIntrinsics::_getShortVolatile : append_unsafe_get_obj(callee, T_SHORT, true); return; 3494 case vmIntrinsics::_getCharVolatile : append_unsafe_get_obj(callee, T_CHAR, true); return; 3495 case vmIntrinsics::_getIntVolatile : append_unsafe_get_obj(callee, T_INT, true); return; 3496 case vmIntrinsics::_getLongVolatile : append_unsafe_get_obj(callee, T_LONG, true); return; 3497 case vmIntrinsics::_getFloatVolatile : append_unsafe_get_obj(callee, T_FLOAT, true); return; 3498 case vmIntrinsics::_getDoubleVolatile : append_unsafe_get_obj(callee, T_DOUBLE, true); return; 3499 case vmIntrinsics::_putReferenceVolatile : append_unsafe_put_obj(callee, T_OBJECT, true); return; 3500 case vmIntrinsics::_putBooleanVolatile : append_unsafe_put_obj(callee, T_BOOLEAN, true); return; 3501 case vmIntrinsics::_putByteVolatile : append_unsafe_put_obj(callee, T_BYTE, true); return; 3502 case vmIntrinsics::_putShortVolatile : append_unsafe_put_obj(callee, T_SHORT, true); return; 3503 case vmIntrinsics::_putCharVolatile : append_unsafe_put_obj(callee, T_CHAR, true); return; 3504 case vmIntrinsics::_putIntVolatile : append_unsafe_put_obj(callee, T_INT, true); return; 3505 case vmIntrinsics::_putLongVolatile : append_unsafe_put_obj(callee, T_LONG, true); return; 3506 case vmIntrinsics::_putFloatVolatile : append_unsafe_put_obj(callee, T_FLOAT, true); return; 3507 case vmIntrinsics::_putDoubleVolatile : append_unsafe_put_obj(callee, T_DOUBLE, true); return; 3508 case vmIntrinsics::_compareAndSetLong: 3509 case vmIntrinsics::_compareAndSetInt: 3510 case vmIntrinsics::_compareAndSetReference : append_unsafe_CAS(callee); return; 3511 case vmIntrinsics::_getAndAddInt: 3512 case vmIntrinsics::_getAndAddLong : append_unsafe_get_and_set_obj(callee, true); return; 3513 case vmIntrinsics::_getAndSetInt : 3514 case vmIntrinsics::_getAndSetLong : 3515 case vmIntrinsics::_getAndSetReference : append_unsafe_get_and_set_obj(callee, false); return; 3516 case vmIntrinsics::_getCharStringU : append_char_access(callee, false); return; 3517 case vmIntrinsics::_putCharStringU : append_char_access(callee, true); return; 3518 default: 3519 break; 3520 } 3521 3522 // create intrinsic node 3523 const bool has_receiver = !callee->is_static(); 3524 ValueType* result_type = as_ValueType(callee->return_type()); 3525 ValueStack* state_before = copy_state_for_exception(); 3526 3527 Values* args = state()->pop_arguments(callee->arg_size()); 3528 3529 if (is_profiling()) { 3530 // Don't profile in the special case where the root method 3531 // is the intrinsic 3532 if (callee != method()) { 3533 // Note that we'd collect profile data in this method if we wanted it. 3534 compilation()->set_would_profile(true); 3535 if (profile_calls()) { 3536 Value recv = NULL; 3537 if (has_receiver) { 3538 recv = args->at(0); 3539 null_check(recv); 3540 } 3541 profile_call(callee, recv, NULL, collect_args_for_profiling(args, callee, true), true); 3542 } 3543 } 3544 } 3545 3546 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), 3547 args, has_receiver, state_before, 3548 vmIntrinsics::preserves_state(id), 3549 vmIntrinsics::can_trap(id)); 3550 // append instruction & push result 3551 Value value = append_split(result); 3552 if (result_type != voidType && !ignore_return) { 3553 push(result_type, value); 3554 } 3555 3556 if (callee != method() && profile_return() && result_type->is_object_kind()) { 3557 profile_return_type(result, callee); 3558 } 3559 } 3560 3561 bool GraphBuilder::try_inline_intrinsics(ciMethod* callee, bool ignore_return) { 3562 // For calling is_intrinsic_available we need to transition to 3563 // the '_thread_in_vm' state because is_intrinsic_available() 3564 // accesses critical VM-internal data. 3565 bool is_available = false; 3566 { 3567 VM_ENTRY_MARK; 3568 methodHandle mh(THREAD, callee->get_Method()); 3569 is_available = _compilation->compiler()->is_intrinsic_available(mh, _compilation->directive()); 3570 } 3571 3572 if (!is_available) { 3573 if (!InlineNatives) { 3574 // Return false and also set message that the inlining of 3575 // intrinsics has been disabled in general. 3576 INLINE_BAILOUT("intrinsic method inlining disabled"); 3577 } else { 3578 return false; 3579 } 3580 } 3581 build_graph_for_intrinsic(callee, ignore_return); 3582 return true; 3583 } 3584 3585 3586 bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) { 3587 // Introduce a new callee continuation point - all Ret instructions 3588 // will be replaced with Gotos to this point. 3589 BlockBegin* cont = block_at(next_bci()); 3590 assert(cont != NULL, "continuation must exist (BlockListBuilder starts a new block after a jsr"); 3591 3592 // Note: can not assign state to continuation yet, as we have to 3593 // pick up the state from the Ret instructions. 3594 3595 // Push callee scope 3596 push_scope_for_jsr(cont, jsr_dest_bci); 3597 3598 // Temporarily set up bytecode stream so we can append instructions 3599 // (only using the bci of this stream) 3600 scope_data()->set_stream(scope_data()->parent()->stream()); 3601 3602 BlockBegin* jsr_start_block = block_at(jsr_dest_bci); 3603 assert(jsr_start_block != NULL, "jsr start block must exist"); 3604 assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet"); 3605 Goto* goto_sub = new Goto(jsr_start_block, false); 3606 // Must copy state to avoid wrong sharing when parsing bytecodes 3607 assert(jsr_start_block->state() == NULL, "should have fresh jsr starting block"); 3608 jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci)); 3609 append(goto_sub); 3610 _block->set_end(goto_sub); 3611 _last = _block = jsr_start_block; 3612 3613 // Clear out bytecode stream 3614 scope_data()->set_stream(NULL); 3615 3616 scope_data()->add_to_work_list(jsr_start_block); 3617 3618 // Ready to resume parsing in subroutine 3619 iterate_all_blocks(); 3620 3621 // If we bailed out during parsing, return immediately (this is bad news) 3622 CHECK_BAILOUT_(false); 3623 3624 // Detect whether the continuation can actually be reached. If not, 3625 // it has not had state set by the join() operations in 3626 // iterate_bytecodes_for_block()/ret() and we should not touch the 3627 // iteration state. The calling activation of 3628 // iterate_bytecodes_for_block will then complete normally. 3629 if (cont->state() != NULL) { 3630 if (!cont->is_set(BlockBegin::was_visited_flag)) { 3631 // add continuation to work list instead of parsing it immediately 3632 scope_data()->parent()->add_to_work_list(cont); 3633 } 3634 } 3635 3636 assert(jsr_continuation() == cont, "continuation must not have changed"); 3637 assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) || 3638 jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag), 3639 "continuation can only be visited in case of backward branches"); 3640 assert(_last && _last->as_BlockEnd(), "block must have end"); 3641 3642 // continuation is in work list, so end iteration of current block 3643 _skip_block = true; 3644 pop_scope_for_jsr(); 3645 3646 return true; 3647 } 3648 3649 3650 // Inline the entry of a synchronized method as a monitor enter and 3651 // register the exception handler which releases the monitor if an 3652 // exception is thrown within the callee. Note that the monitor enter 3653 // cannot throw an exception itself, because the receiver is 3654 // guaranteed to be non-null by the explicit null check at the 3655 // beginning of inlining. 3656 void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) { 3657 assert(lock != NULL && sync_handler != NULL, "lock or handler missing"); 3658 3659 monitorenter(lock, SynchronizationEntryBCI); 3660 assert(_last->as_MonitorEnter() != NULL, "monitor enter expected"); 3661 _last->set_needs_null_check(false); 3662 3663 sync_handler->set(BlockBegin::exception_entry_flag); 3664 sync_handler->set(BlockBegin::is_on_work_list_flag); 3665 3666 ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0); 3667 XHandler* h = new XHandler(desc); 3668 h->set_entry_block(sync_handler); 3669 scope_data()->xhandlers()->append(h); 3670 scope_data()->set_has_handler(); 3671 } 3672 3673 3674 // If an exception is thrown and not handled within an inlined 3675 // synchronized method, the monitor must be released before the 3676 // exception is rethrown in the outer scope. Generate the appropriate 3677 // instructions here. 3678 void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) { 3679 BlockBegin* orig_block = _block; 3680 ValueStack* orig_state = _state; 3681 Instruction* orig_last = _last; 3682 _last = _block = sync_handler; 3683 _state = sync_handler->state()->copy(); 3684 3685 assert(sync_handler != NULL, "handler missing"); 3686 assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here"); 3687 3688 assert(lock != NULL || default_handler, "lock or handler missing"); 3689 3690 XHandler* h = scope_data()->xhandlers()->remove_last(); 3691 assert(h->entry_block() == sync_handler, "corrupt list of handlers"); 3692 3693 block()->set(BlockBegin::was_visited_flag); 3694 Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI); 3695 assert(exception->is_pinned(), "must be"); 3696 3697 int bci = SynchronizationEntryBCI; 3698 if (compilation()->env()->dtrace_method_probes()) { 3699 // Report exit from inline methods. We don't have a stream here 3700 // so pass an explicit bci of SynchronizationEntryBCI. 3701 Values* args = new Values(1); 3702 args->push(append_with_bci(new Constant(new MethodConstant(method())), bci)); 3703 append_with_bci(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args), bci); 3704 } 3705 3706 if (lock) { 3707 assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing"); 3708 if (!lock->is_linked()) { 3709 lock = append_with_bci(lock, bci); 3710 } 3711 3712 // exit the monitor in the context of the synchronized method 3713 monitorexit(lock, bci); 3714 3715 // exit the context of the synchronized method 3716 if (!default_handler) { 3717 pop_scope(); 3718 bci = _state->caller_state()->bci(); 3719 _state = _state->caller_state()->copy_for_parsing(); 3720 } 3721 } 3722 3723 // perform the throw as if at the the call site 3724 apush(exception); 3725 throw_op(bci); 3726 3727 BlockEnd* end = last()->as_BlockEnd(); 3728 block()->set_end(end); 3729 3730 _block = orig_block; 3731 _state = orig_state; 3732 _last = orig_last; 3733 } 3734 3735 3736 bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known, bool ignore_return, Bytecodes::Code bc, Value receiver) { 3737 assert(!callee->is_native(), "callee must not be native"); 3738 if (CompilationPolicy::policy()->should_not_inline(compilation()->env(), callee)) { 3739 INLINE_BAILOUT("inlining prohibited by policy"); 3740 } 3741 // first perform tests of things it's not possible to inline 3742 if (callee->has_exception_handlers() && 3743 !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers"); 3744 if (callee->is_synchronized() && 3745 !InlineSynchronizedMethods ) INLINE_BAILOUT("callee is synchronized"); 3746 if (!callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet"); 3747 if (!callee->has_balanced_monitors()) INLINE_BAILOUT("callee's monitors do not match"); 3748 3749 // Proper inlining of methods with jsrs requires a little more work. 3750 if (callee->has_jsrs() ) INLINE_BAILOUT("jsrs not handled properly by inliner yet"); 3751 3752 // When SSE2 is used on intel, then no special handling is needed 3753 // for strictfp because the enum-constant is fixed at compile time, 3754 // the check for UseSSE2 is needed here 3755 if (strict_fp_requires_explicit_rounding && UseSSE < 2 && method()->is_strict() != callee->is_strict()) { 3756 INLINE_BAILOUT("caller and callee have different strict fp requirements"); 3757 } 3758 3759 if (is_profiling() && !callee->ensure_method_data()) { 3760 INLINE_BAILOUT("mdo allocation failed"); 3761 } 3762 3763 // now perform tests that are based on flag settings 3764 bool inlinee_by_directive = compilation()->directive()->should_inline(callee); 3765 if (callee->force_inline() || inlinee_by_directive) { 3766 if (inline_level() > MaxForceInlineLevel ) INLINE_BAILOUT("MaxForceInlineLevel"); 3767 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep"); 3768 3769 const char* msg = ""; 3770 if (callee->force_inline()) msg = "force inline by annotation"; 3771 if (inlinee_by_directive) msg = "force inline by CompileCommand"; 3772 print_inlining(callee, msg); 3773 } else { 3774 // use heuristic controls on inlining 3775 if (inline_level() > MaxInlineLevel ) INLINE_BAILOUT("inlining too deep"); 3776 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep"); 3777 if (callee->code_size_for_inlining() > max_inline_size() ) INLINE_BAILOUT("callee is too large"); 3778 3779 // don't inline throwable methods unless the inlining tree is rooted in a throwable class 3780 if (callee->name() == ciSymbol::object_initializer_name() && 3781 callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) { 3782 // Throwable constructor call 3783 IRScope* top = scope(); 3784 while (top->caller() != NULL) { 3785 top = top->caller(); 3786 } 3787 if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) { 3788 INLINE_BAILOUT("don't inline Throwable constructors"); 3789 } 3790 } 3791 3792 if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) { 3793 INLINE_BAILOUT("total inlining greater than DesiredMethodLimit"); 3794 } 3795 // printing 3796 print_inlining(callee); 3797 } 3798 3799 // NOTE: Bailouts from this point on, which occur at the 3800 // GraphBuilder level, do not cause bailout just of the inlining but 3801 // in fact of the entire compilation. 3802 3803 BlockBegin* orig_block = block(); 3804 3805 const bool is_invokedynamic = bc == Bytecodes::_invokedynamic; 3806 const bool has_receiver = (bc != Bytecodes::_invokestatic && !is_invokedynamic); 3807 3808 const int args_base = state()->stack_size() - callee->arg_size(); 3809 assert(args_base >= 0, "stack underflow during inlining"); 3810 3811 // Insert null check if necessary 3812 Value recv = NULL; 3813 if (has_receiver) { 3814 // note: null check must happen even if first instruction of callee does 3815 // an implicit null check since the callee is in a different scope 3816 // and we must make sure exception handling does the right thing 3817 assert(!callee->is_static(), "callee must not be static"); 3818 assert(callee->arg_size() > 0, "must have at least a receiver"); 3819 recv = state()->stack_at(args_base); 3820 null_check(recv); 3821 } 3822 3823 if (is_profiling()) { 3824 // Note that we'd collect profile data in this method if we wanted it. 3825 // this may be redundant here... 3826 compilation()->set_would_profile(true); 3827 3828 if (profile_calls()) { 3829 int start = 0; 3830 Values* obj_args = args_list_for_profiling(callee, start, has_receiver); 3831 if (obj_args != NULL) { 3832 int s = obj_args->max_length(); 3833 // if called through method handle invoke, some arguments may have been popped 3834 for (int i = args_base+start, j = 0; j < obj_args->max_length() && i < state()->stack_size(); ) { 3835 Value v = state()->stack_at_inc(i); 3836 if (v->type()->is_object_kind()) { 3837 obj_args->push(v); 3838 j++; 3839 } 3840 } 3841 check_args_for_profiling(obj_args, s); 3842 } 3843 profile_call(callee, recv, holder_known ? callee->holder() : NULL, obj_args, true); 3844 } 3845 } 3846 3847 // Introduce a new callee continuation point - if the callee has 3848 // more than one return instruction or the return does not allow 3849 // fall-through of control flow, all return instructions of the 3850 // callee will need to be replaced by Goto's pointing to this 3851 // continuation point. 3852 BlockBegin* cont = block_at(next_bci()); 3853 bool continuation_existed = true; 3854 if (cont == NULL) { 3855 cont = new BlockBegin(next_bci()); 3856 // low number so that continuation gets parsed as early as possible 3857 cont->set_depth_first_number(0); 3858 if (PrintInitialBlockList) { 3859 tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d", 3860 cont->block_id(), cont->bci(), bci()); 3861 } 3862 continuation_existed = false; 3863 } 3864 // Record number of predecessors of continuation block before 3865 // inlining, to detect if inlined method has edges to its 3866 // continuation after inlining. 3867 int continuation_preds = cont->number_of_preds(); 3868 3869 // Push callee scope 3870 push_scope(callee, cont); 3871 3872 // the BlockListBuilder for the callee could have bailed out 3873 if (bailed_out()) 3874 return false; 3875 3876 // Temporarily set up bytecode stream so we can append instructions 3877 // (only using the bci of this stream) 3878 scope_data()->set_stream(scope_data()->parent()->stream()); 3879 3880 // Pass parameters into callee state: add assignments 3881 // note: this will also ensure that all arguments are computed before being passed 3882 ValueStack* callee_state = state(); 3883 ValueStack* caller_state = state()->caller_state(); 3884 for (int i = args_base; i < caller_state->stack_size(); ) { 3885 const int arg_no = i - args_base; 3886 Value arg = caller_state->stack_at_inc(i); 3887 store_local(callee_state, arg, arg_no); 3888 } 3889 3890 // Remove args from stack. 3891 // Note that we preserve locals state in case we can use it later 3892 // (see use of pop_scope() below) 3893 caller_state->truncate_stack(args_base); 3894 assert(callee_state->stack_size() == 0, "callee stack must be empty"); 3895 3896 Value lock = NULL; 3897 BlockBegin* sync_handler = NULL; 3898 3899 // Inline the locking of the receiver if the callee is synchronized 3900 if (callee->is_synchronized()) { 3901 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror()))) 3902 : state()->local_at(0); 3903 sync_handler = new BlockBegin(SynchronizationEntryBCI); 3904 inline_sync_entry(lock, sync_handler); 3905 } 3906 3907 if (compilation()->env()->dtrace_method_probes()) { 3908 Values* args = new Values(1); 3909 args->push(append(new Constant(new MethodConstant(method())))); 3910 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args)); 3911 } 3912 3913 if (profile_inlined_calls()) { 3914 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI)); 3915 } 3916 3917 BlockBegin* callee_start_block = block_at(0); 3918 if (callee_start_block != NULL) { 3919 assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header"); 3920 Goto* goto_callee = new Goto(callee_start_block, false); 3921 // The state for this goto is in the scope of the callee, so use 3922 // the entry bci for the callee instead of the call site bci. 3923 append_with_bci(goto_callee, 0); 3924 _block->set_end(goto_callee); 3925 callee_start_block->merge(callee_state); 3926 3927 _last = _block = callee_start_block; 3928 3929 scope_data()->add_to_work_list(callee_start_block); 3930 } 3931 3932 // Clear out bytecode stream 3933 scope_data()->set_stream(NULL); 3934 scope_data()->set_ignore_return(ignore_return); 3935 3936 CompileLog* log = compilation()->log(); 3937 if (log != NULL) log->head("parse method='%d'", log->identify(callee)); 3938 3939 // Ready to resume parsing in callee (either in the same block we 3940 // were in before or in the callee's start block) 3941 iterate_all_blocks(callee_start_block == NULL); 3942 3943 if (log != NULL) log->done("parse"); 3944 3945 // If we bailed out during parsing, return immediately (this is bad news) 3946 if (bailed_out()) 3947 return false; 3948 3949 // iterate_all_blocks theoretically traverses in random order; in 3950 // practice, we have only traversed the continuation if we are 3951 // inlining into a subroutine 3952 assert(continuation_existed || 3953 !continuation()->is_set(BlockBegin::was_visited_flag), 3954 "continuation should not have been parsed yet if we created it"); 3955 3956 // At this point we are almost ready to return and resume parsing of 3957 // the caller back in the GraphBuilder. The only thing we want to do 3958 // first is an optimization: during parsing of the callee we 3959 // generated at least one Goto to the continuation block. If we 3960 // generated exactly one, and if the inlined method spanned exactly 3961 // one block (and we didn't have to Goto its entry), then we snip 3962 // off the Goto to the continuation, allowing control to fall 3963 // through back into the caller block and effectively performing 3964 // block merging. This allows load elimination and CSE to take place 3965 // across multiple callee scopes if they are relatively simple, and 3966 // is currently essential to making inlining profitable. 3967 if (num_returns() == 1 3968 && block() == orig_block 3969 && block() == inline_cleanup_block()) { 3970 _last = inline_cleanup_return_prev(); 3971 _state = inline_cleanup_state(); 3972 } else if (continuation_preds == cont->number_of_preds()) { 3973 // Inlining caused that the instructions after the invoke in the 3974 // caller are not reachable any more. So skip filling this block 3975 // with instructions! 3976 assert(cont == continuation(), ""); 3977 assert(_last && _last->as_BlockEnd(), ""); 3978 _skip_block = true; 3979 } else { 3980 // Resume parsing in continuation block unless it was already parsed. 3981 // Note that if we don't change _last here, iteration in 3982 // iterate_bytecodes_for_block will stop when we return. 3983 if (!continuation()->is_set(BlockBegin::was_visited_flag)) { 3984 // add continuation to work list instead of parsing it immediately 3985 assert(_last && _last->as_BlockEnd(), ""); 3986 scope_data()->parent()->add_to_work_list(continuation()); 3987 _skip_block = true; 3988 } 3989 } 3990 3991 // Fill the exception handler for synchronized methods with instructions 3992 if (callee->is_synchronized() && sync_handler->state() != NULL) { 3993 fill_sync_handler(lock, sync_handler); 3994 } else { 3995 pop_scope(); 3996 } 3997 3998 compilation()->notice_inlined_method(callee); 3999 4000 return true; 4001 } 4002 4003 4004 bool GraphBuilder::try_method_handle_inline(ciMethod* callee, bool ignore_return) { 4005 ValueStack* state_before = copy_state_before(); 4006 vmIntrinsics::ID iid = callee->intrinsic_id(); 4007 switch (iid) { 4008 case vmIntrinsics::_invokeBasic: 4009 { 4010 // get MethodHandle receiver 4011 const int args_base = state()->stack_size() - callee->arg_size(); 4012 ValueType* type = state()->stack_at(args_base)->type(); 4013 if (type->is_constant()) { 4014 ciMethod* target = type->as_ObjectType()->constant_value()->as_method_handle()->get_vmtarget(); 4015 // We don't do CHA here so only inline static and statically bindable methods. 4016 if (target->is_static() || target->can_be_statically_bound()) { 4017 if (ciMethod::is_consistent_info(callee, target)) { 4018 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual; 4019 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void()); 4020 if (try_inline(target, /*holder_known*/ true, ignore_return, bc)) { 4021 return true; 4022 } 4023 } else { 4024 print_inlining(target, "signatures mismatch", /*success*/ false); 4025 } 4026 } else { 4027 print_inlining(target, "not static or statically bindable", /*success*/ false); 4028 } 4029 } else { 4030 print_inlining(callee, "receiver not constant", /*success*/ false); 4031 } 4032 } 4033 break; 4034 4035 case vmIntrinsics::_linkToVirtual: 4036 case vmIntrinsics::_linkToStatic: 4037 case vmIntrinsics::_linkToSpecial: 4038 case vmIntrinsics::_linkToInterface: 4039 { 4040 // pop MemberName argument 4041 const int args_base = state()->stack_size() - callee->arg_size(); 4042 ValueType* type = apop()->type(); 4043 if (type->is_constant()) { 4044 ciMethod* target = type->as_ObjectType()->constant_value()->as_member_name()->get_vmtarget(); 4045 ignore_return = ignore_return || (callee->return_type()->is_void() && !target->return_type()->is_void()); 4046 // If the target is another method handle invoke, try to recursively get 4047 // a better target. 4048 if (target->is_method_handle_intrinsic()) { 4049 if (try_method_handle_inline(target, ignore_return)) { 4050 return true; 4051 } 4052 } else if (!ciMethod::is_consistent_info(callee, target)) { 4053 print_inlining(target, "signatures mismatch", /*success*/ false); 4054 } else { 4055 ciSignature* signature = target->signature(); 4056 const int receiver_skip = target->is_static() ? 0 : 1; 4057 // Cast receiver to its type. 4058 if (!target->is_static()) { 4059 ciKlass* tk = signature->accessing_klass(); 4060 Value obj = state()->stack_at(args_base); 4061 if (obj->exact_type() == NULL && 4062 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) { 4063 TypeCast* c = new TypeCast(tk, obj, state_before); 4064 append(c); 4065 state()->stack_at_put(args_base, c); 4066 } 4067 } 4068 // Cast reference arguments to its type. 4069 for (int i = 0, j = 0; i < signature->count(); i++) { 4070 ciType* t = signature->type_at(i); 4071 if (t->is_klass()) { 4072 ciKlass* tk = t->as_klass(); 4073 Value obj = state()->stack_at(args_base + receiver_skip + j); 4074 if (obj->exact_type() == NULL && 4075 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) { 4076 TypeCast* c = new TypeCast(t, obj, state_before); 4077 append(c); 4078 state()->stack_at_put(args_base + receiver_skip + j, c); 4079 } 4080 } 4081 j += t->size(); // long and double take two slots 4082 } 4083 // We don't do CHA here so only inline static and statically bindable methods. 4084 if (target->is_static() || target->can_be_statically_bound()) { 4085 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual; 4086 if (try_inline(target, /*holder_known*/ true, ignore_return, bc)) { 4087 return true; 4088 } 4089 } else { 4090 print_inlining(target, "not static or statically bindable", /*success*/ false); 4091 } 4092 } 4093 } else { 4094 print_inlining(callee, "MemberName not constant", /*success*/ false); 4095 } 4096 } 4097 break; 4098 4099 default: 4100 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)); 4101 break; 4102 } 4103 set_state(state_before->copy_for_parsing()); 4104 return false; 4105 } 4106 4107 4108 void GraphBuilder::inline_bailout(const char* msg) { 4109 assert(msg != NULL, "inline bailout msg must exist"); 4110 _inline_bailout_msg = msg; 4111 } 4112 4113 4114 void GraphBuilder::clear_inline_bailout() { 4115 _inline_bailout_msg = NULL; 4116 } 4117 4118 4119 void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) { 4120 ScopeData* data = new ScopeData(NULL); 4121 data->set_scope(scope); 4122 data->set_bci2block(bci2block); 4123 _scope_data = data; 4124 _block = start; 4125 } 4126 4127 4128 void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) { 4129 IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false); 4130 scope()->add_callee(callee_scope); 4131 4132 BlockListBuilder blb(compilation(), callee_scope, -1); 4133 CHECK_BAILOUT(); 4134 4135 if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) { 4136 // this scope can be inlined directly into the caller so remove 4137 // the block at bci 0. 4138 blb.bci2block()->at_put(0, NULL); 4139 } 4140 4141 set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci()))); 4142 4143 ScopeData* data = new ScopeData(scope_data()); 4144 data->set_scope(callee_scope); 4145 data->set_bci2block(blb.bci2block()); 4146 data->set_continuation(continuation); 4147 _scope_data = data; 4148 } 4149 4150 4151 void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) { 4152 ScopeData* data = new ScopeData(scope_data()); 4153 data->set_parsing_jsr(); 4154 data->set_jsr_entry_bci(jsr_dest_bci); 4155 data->set_jsr_return_address_local(-1); 4156 // Must clone bci2block list as we will be mutating it in order to 4157 // properly clone all blocks in jsr region as well as exception 4158 // handlers containing rets 4159 BlockList* new_bci2block = new BlockList(bci2block()->length()); 4160 new_bci2block->appendAll(bci2block()); 4161 data->set_bci2block(new_bci2block); 4162 data->set_scope(scope()); 4163 data->setup_jsr_xhandlers(); 4164 data->set_continuation(continuation()); 4165 data->set_jsr_continuation(jsr_continuation); 4166 _scope_data = data; 4167 } 4168 4169 4170 void GraphBuilder::pop_scope() { 4171 int number_of_locks = scope()->number_of_locks(); 4172 _scope_data = scope_data()->parent(); 4173 // accumulate minimum number of monitor slots to be reserved 4174 scope()->set_min_number_of_locks(number_of_locks); 4175 } 4176 4177 4178 void GraphBuilder::pop_scope_for_jsr() { 4179 _scope_data = scope_data()->parent(); 4180 } 4181 4182 void GraphBuilder::append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile) { 4183 Values* args = state()->pop_arguments(callee->arg_size()); 4184 null_check(args->at(0)); 4185 Instruction* offset = args->at(2); 4186 #ifndef _LP64 4187 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4188 #endif 4189 Instruction* op = append(new UnsafeGetObject(t, args->at(1), offset, is_volatile)); 4190 push(op->type(), op); 4191 compilation()->set_has_unsafe_access(true); 4192 } 4193 4194 4195 void GraphBuilder::append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile) { 4196 Values* args = state()->pop_arguments(callee->arg_size()); 4197 null_check(args->at(0)); 4198 Instruction* offset = args->at(2); 4199 #ifndef _LP64 4200 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4201 #endif 4202 Value val = args->at(3); 4203 if (t == T_BOOLEAN) { 4204 Value mask = append(new Constant(new IntConstant(1))); 4205 val = append(new LogicOp(Bytecodes::_iand, val, mask)); 4206 } 4207 Instruction* op = append(new UnsafePutObject(t, args->at(1), offset, val, is_volatile)); 4208 compilation()->set_has_unsafe_access(true); 4209 kill_all(); 4210 } 4211 4212 4213 void GraphBuilder::append_unsafe_get_raw(ciMethod* callee, BasicType t) { 4214 Values* args = state()->pop_arguments(callee->arg_size()); 4215 null_check(args->at(0)); 4216 Instruction* op = append(new UnsafeGetRaw(t, args->at(1), false)); 4217 push(op->type(), op); 4218 compilation()->set_has_unsafe_access(true); 4219 } 4220 4221 4222 void GraphBuilder::append_unsafe_put_raw(ciMethod* callee, BasicType t) { 4223 Values* args = state()->pop_arguments(callee->arg_size()); 4224 null_check(args->at(0)); 4225 Instruction* op = append(new UnsafePutRaw(t, args->at(1), args->at(2))); 4226 compilation()->set_has_unsafe_access(true); 4227 } 4228 4229 4230 void GraphBuilder::append_unsafe_CAS(ciMethod* callee) { 4231 ValueStack* state_before = copy_state_for_exception(); 4232 ValueType* result_type = as_ValueType(callee->return_type()); 4233 assert(result_type->is_int(), "int result"); 4234 Values* args = state()->pop_arguments(callee->arg_size()); 4235 4236 // Pop off some args to specially handle, then push back 4237 Value newval = args->pop(); 4238 Value cmpval = args->pop(); 4239 Value offset = args->pop(); 4240 Value src = args->pop(); 4241 Value unsafe_obj = args->pop(); 4242 4243 // Separately handle the unsafe arg. It is not needed for code 4244 // generation, but must be null checked 4245 null_check(unsafe_obj); 4246 4247 #ifndef _LP64 4248 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4249 #endif 4250 4251 args->push(src); 4252 args->push(offset); 4253 args->push(cmpval); 4254 args->push(newval); 4255 4256 // An unsafe CAS can alias with other field accesses, but we don't 4257 // know which ones so mark the state as no preserved. This will 4258 // cause CSE to invalidate memory across it. 4259 bool preserves_state = false; 4260 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state); 4261 append_split(result); 4262 push(result_type, result); 4263 compilation()->set_has_unsafe_access(true); 4264 } 4265 4266 void GraphBuilder::append_char_access(ciMethod* callee, bool is_store) { 4267 // This intrinsic accesses byte[] array as char[] array. Computing the offsets 4268 // correctly requires matched array shapes. 4269 assert (arrayOopDesc::base_offset_in_bytes(T_CHAR) == arrayOopDesc::base_offset_in_bytes(T_BYTE), 4270 "sanity: byte[] and char[] bases agree"); 4271 assert (type2aelembytes(T_CHAR) == type2aelembytes(T_BYTE)*2, 4272 "sanity: byte[] and char[] scales agree"); 4273 4274 ValueStack* state_before = copy_state_indexed_access(); 4275 compilation()->set_has_access_indexed(true); 4276 Values* args = state()->pop_arguments(callee->arg_size()); 4277 Value array = args->at(0); 4278 Value index = args->at(1); 4279 if (is_store) { 4280 Value value = args->at(2); 4281 Instruction* store = append(new StoreIndexed(array, index, NULL, T_CHAR, value, state_before, false, true)); 4282 store->set_flag(Instruction::NeedsRangeCheckFlag, false); 4283 _memory->store_value(value); 4284 } else { 4285 Instruction* load = append(new LoadIndexed(array, index, NULL, T_CHAR, state_before, true)); 4286 load->set_flag(Instruction::NeedsRangeCheckFlag, false); 4287 push(load->type(), load); 4288 } 4289 } 4290 4291 static void post_inlining_event(EventCompilerInlining* event, 4292 int compile_id, 4293 const char* msg, 4294 bool success, 4295 int bci, 4296 ciMethod* caller, 4297 ciMethod* callee) { 4298 assert(caller != NULL, "invariant"); 4299 assert(callee != NULL, "invariant"); 4300 assert(event != NULL, "invariant"); 4301 assert(event->should_commit(), "invariant"); 4302 JfrStructCalleeMethod callee_struct; 4303 callee_struct.set_type(callee->holder()->name()->as_utf8()); 4304 callee_struct.set_name(callee->name()->as_utf8()); 4305 callee_struct.set_descriptor(callee->signature()->as_symbol()->as_utf8()); 4306 event->set_compileId(compile_id); 4307 event->set_message(msg); 4308 event->set_succeeded(success); 4309 event->set_bci(bci); 4310 event->set_caller(caller->get_Method()); 4311 event->set_callee(callee_struct); 4312 event->commit(); 4313 } 4314 4315 void GraphBuilder::print_inlining(ciMethod* callee, const char* msg, bool success) { 4316 CompileLog* log = compilation()->log(); 4317 if (log != NULL) { 4318 if (success) { 4319 if (msg != NULL) 4320 log->inline_success(msg); 4321 else 4322 log->inline_success("receiver is statically known"); 4323 } else { 4324 if (msg != NULL) 4325 log->inline_fail(msg); 4326 else 4327 log->inline_fail("reason unknown"); 4328 } 4329 } 4330 EventCompilerInlining event; 4331 if (event.should_commit()) { 4332 post_inlining_event(&event, compilation()->env()->task()->compile_id(), msg, success, bci(), method(), callee); 4333 } 4334 4335 CompileTask::print_inlining_ul(callee, scope()->level(), bci(), msg); 4336 4337 if (!compilation()->directive()->PrintInliningOption) { 4338 return; 4339 } 4340 CompileTask::print_inlining_tty(callee, scope()->level(), bci(), msg); 4341 if (success && CIPrintMethodCodes) { 4342 callee->print_codes(); 4343 } 4344 } 4345 4346 void GraphBuilder::append_unsafe_get_and_set_obj(ciMethod* callee, bool is_add) { 4347 Values* args = state()->pop_arguments(callee->arg_size()); 4348 BasicType t = callee->return_type()->basic_type(); 4349 null_check(args->at(0)); 4350 Instruction* offset = args->at(2); 4351 #ifndef _LP64 4352 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4353 #endif 4354 Instruction* op = append(new UnsafeGetAndSetObject(t, args->at(1), offset, args->at(3), is_add)); 4355 compilation()->set_has_unsafe_access(true); 4356 kill_all(); 4357 push(op->type(), op); 4358 } 4359 4360 #ifndef PRODUCT 4361 void GraphBuilder::print_stats() { 4362 vmap()->print(); 4363 } 4364 #endif // PRODUCT 4365 4366 void GraphBuilder::profile_call(ciMethod* callee, Value recv, ciKlass* known_holder, Values* obj_args, bool inlined) { 4367 assert(known_holder == NULL || (known_holder->is_instance_klass() && 4368 (!known_holder->is_interface() || 4369 ((ciInstanceKlass*)known_holder)->has_nonstatic_concrete_methods())), "should be non-static concrete method"); 4370 if (known_holder != NULL) { 4371 if (known_holder->exact_klass() == NULL) { 4372 known_holder = compilation()->cha_exact_type(known_holder); 4373 } 4374 } 4375 4376 append(new ProfileCall(method(), bci(), callee, recv, known_holder, obj_args, inlined)); 4377 } 4378 4379 void GraphBuilder::profile_return_type(Value ret, ciMethod* callee, ciMethod* m, int invoke_bci) { 4380 assert((m == NULL) == (invoke_bci < 0), "invalid method and invalid bci together"); 4381 if (m == NULL) { 4382 m = method(); 4383 } 4384 if (invoke_bci < 0) { 4385 invoke_bci = bci(); 4386 } 4387 ciMethodData* md = m->method_data_or_null(); 4388 ciProfileData* data = md->bci_to_data(invoke_bci); 4389 if (data != NULL && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) { 4390 bool has_return = data->is_CallTypeData() ? ((ciCallTypeData*)data)->has_return() : ((ciVirtualCallTypeData*)data)->has_return(); 4391 if (has_return) { 4392 append(new ProfileReturnType(m , invoke_bci, callee, ret)); 4393 } 4394 } 4395 } 4396 4397 void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) { 4398 append(new ProfileInvoke(callee, state)); 4399 }