c1_GraphBuilder.cpp revision 6760:22b98ab2a69f
1/* 2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "c1/c1_CFGPrinter.hpp" 27#include "c1/c1_Canonicalizer.hpp" 28#include "c1/c1_Compilation.hpp" 29#include "c1/c1_GraphBuilder.hpp" 30#include "c1/c1_InstructionPrinter.hpp" 31#include "ci/ciCallSite.hpp" 32#include "ci/ciField.hpp" 33#include "ci/ciKlass.hpp" 34#include "ci/ciMemberName.hpp" 35#include "compiler/compileBroker.hpp" 36#include "interpreter/bytecode.hpp" 37#include "runtime/sharedRuntime.hpp" 38#include "runtime/compilationPolicy.hpp" 39#include "runtime/vm_version.hpp" 40#include "utilities/bitMap.inline.hpp" 41 42class BlockListBuilder VALUE_OBJ_CLASS_SPEC { 43 private: 44 Compilation* _compilation; 45 IRScope* _scope; 46 47 BlockList _blocks; // internal list of all blocks 48 BlockList* _bci2block; // mapping from bci to blocks for GraphBuilder 49 50 // fields used by mark_loops 51 BitMap _active; // for iteration of control flow graph 52 BitMap _visited; // for iteration of control flow graph 53 intArray _loop_map; // caches the information if a block is contained in a loop 54 int _next_loop_index; // next free loop number 55 int _next_block_number; // for reverse postorder numbering of blocks 56 57 // accessors 58 Compilation* compilation() const { return _compilation; } 59 IRScope* scope() const { return _scope; } 60 ciMethod* method() const { return scope()->method(); } 61 XHandlers* xhandlers() const { return scope()->xhandlers(); } 62 63 // unified bailout support 64 void bailout(const char* msg) const { compilation()->bailout(msg); } 65 bool bailed_out() const { return compilation()->bailed_out(); } 66 67 // helper functions 68 BlockBegin* make_block_at(int bci, BlockBegin* predecessor); 69 void handle_exceptions(BlockBegin* current, int cur_bci); 70 void handle_jsr(BlockBegin* current, int sr_bci, int next_bci); 71 void store_one(BlockBegin* current, int local); 72 void store_two(BlockBegin* current, int local); 73 void set_entries(int osr_bci); 74 void set_leaders(); 75 76 void make_loop_header(BlockBegin* block); 77 void mark_loops(); 78 int mark_loops(BlockBegin* b, bool in_subroutine); 79 80 // debugging 81#ifndef PRODUCT 82 void print(); 83#endif 84 85 public: 86 // creation 87 BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci); 88 89 // accessors for GraphBuilder 90 BlockList* bci2block() const { return _bci2block; } 91}; 92 93 94// Implementation of BlockListBuilder 95 96BlockListBuilder::BlockListBuilder(Compilation* compilation, IRScope* scope, int osr_bci) 97 : _compilation(compilation) 98 , _scope(scope) 99 , _blocks(16) 100 , _bci2block(new BlockList(scope->method()->code_size(), NULL)) 101 , _next_block_number(0) 102 , _active() // size not known yet 103 , _visited() // size not known yet 104 , _next_loop_index(0) 105 , _loop_map() // size not known yet 106{ 107 set_entries(osr_bci); 108 set_leaders(); 109 CHECK_BAILOUT(); 110 111 mark_loops(); 112 NOT_PRODUCT(if (PrintInitialBlockList) print()); 113 114#ifndef PRODUCT 115 if (PrintCFGToFile) { 116 stringStream title; 117 title.print("BlockListBuilder "); 118 scope->method()->print_name(&title); 119 CFGPrinter::print_cfg(_bci2block, title.as_string(), false, false); 120 } 121#endif 122} 123 124 125void BlockListBuilder::set_entries(int osr_bci) { 126 // generate start blocks 127 BlockBegin* std_entry = make_block_at(0, NULL); 128 if (scope()->caller() == NULL) { 129 std_entry->set(BlockBegin::std_entry_flag); 130 } 131 if (osr_bci != -1) { 132 BlockBegin* osr_entry = make_block_at(osr_bci, NULL); 133 osr_entry->set(BlockBegin::osr_entry_flag); 134 } 135 136 // generate exception entry blocks 137 XHandlers* list = xhandlers(); 138 const int n = list->length(); 139 for (int i = 0; i < n; i++) { 140 XHandler* h = list->handler_at(i); 141 BlockBegin* entry = make_block_at(h->handler_bci(), NULL); 142 entry->set(BlockBegin::exception_entry_flag); 143 h->set_entry_block(entry); 144 } 145} 146 147 148BlockBegin* BlockListBuilder::make_block_at(int cur_bci, BlockBegin* predecessor) { 149 assert(method()->bci_block_start().at(cur_bci), "wrong block starts of MethodLivenessAnalyzer"); 150 151 BlockBegin* block = _bci2block->at(cur_bci); 152 if (block == NULL) { 153 block = new BlockBegin(cur_bci); 154 block->init_stores_to_locals(method()->max_locals()); 155 _bci2block->at_put(cur_bci, block); 156 _blocks.append(block); 157 158 assert(predecessor == NULL || predecessor->bci() < cur_bci, "targets for backward branches must already exist"); 159 } 160 161 if (predecessor != NULL) { 162 if (block->is_set(BlockBegin::exception_entry_flag)) { 163 BAILOUT_("Exception handler can be reached by both normal and exceptional control flow", block); 164 } 165 166 predecessor->add_successor(block); 167 block->increment_total_preds(); 168 } 169 170 return block; 171} 172 173 174inline void BlockListBuilder::store_one(BlockBegin* current, int local) { 175 current->stores_to_locals().set_bit(local); 176} 177inline void BlockListBuilder::store_two(BlockBegin* current, int local) { 178 store_one(current, local); 179 store_one(current, local + 1); 180} 181 182 183void BlockListBuilder::handle_exceptions(BlockBegin* current, int cur_bci) { 184 // Draws edges from a block to its exception handlers 185 XHandlers* list = xhandlers(); 186 const int n = list->length(); 187 188 for (int i = 0; i < n; i++) { 189 XHandler* h = list->handler_at(i); 190 191 if (h->covers(cur_bci)) { 192 BlockBegin* entry = h->entry_block(); 193 assert(entry != NULL && entry == _bci2block->at(h->handler_bci()), "entry must be set"); 194 assert(entry->is_set(BlockBegin::exception_entry_flag), "flag must be set"); 195 196 // add each exception handler only once 197 if (!current->is_successor(entry)) { 198 current->add_successor(entry); 199 entry->increment_total_preds(); 200 } 201 202 // stop when reaching catchall 203 if (h->catch_type() == 0) break; 204 } 205 } 206} 207 208void BlockListBuilder::handle_jsr(BlockBegin* current, int sr_bci, int next_bci) { 209 // start a new block after jsr-bytecode and link this block into cfg 210 make_block_at(next_bci, current); 211 212 // start a new block at the subroutine entry at mark it with special flag 213 BlockBegin* sr_block = make_block_at(sr_bci, current); 214 if (!sr_block->is_set(BlockBegin::subroutine_entry_flag)) { 215 sr_block->set(BlockBegin::subroutine_entry_flag); 216 } 217} 218 219 220void BlockListBuilder::set_leaders() { 221 bool has_xhandlers = xhandlers()->has_handlers(); 222 BlockBegin* current = NULL; 223 224 // The information which bci starts a new block simplifies the analysis 225 // Without it, backward branches could jump to a bci where no block was created 226 // during bytecode iteration. This would require the creation of a new block at the 227 // branch target and a modification of the successor lists. 228 BitMap bci_block_start = method()->bci_block_start(); 229 230 ciBytecodeStream s(method()); 231 while (s.next() != ciBytecodeStream::EOBC()) { 232 int cur_bci = s.cur_bci(); 233 234 if (bci_block_start.at(cur_bci)) { 235 current = make_block_at(cur_bci, current); 236 } 237 assert(current != NULL, "must have current block"); 238 239 if (has_xhandlers && GraphBuilder::can_trap(method(), s.cur_bc())) { 240 handle_exceptions(current, cur_bci); 241 } 242 243 switch (s.cur_bc()) { 244 // track stores to local variables for selective creation of phi functions 245 case Bytecodes::_iinc: store_one(current, s.get_index()); break; 246 case Bytecodes::_istore: store_one(current, s.get_index()); break; 247 case Bytecodes::_lstore: store_two(current, s.get_index()); break; 248 case Bytecodes::_fstore: store_one(current, s.get_index()); break; 249 case Bytecodes::_dstore: store_two(current, s.get_index()); break; 250 case Bytecodes::_astore: store_one(current, s.get_index()); break; 251 case Bytecodes::_istore_0: store_one(current, 0); break; 252 case Bytecodes::_istore_1: store_one(current, 1); break; 253 case Bytecodes::_istore_2: store_one(current, 2); break; 254 case Bytecodes::_istore_3: store_one(current, 3); break; 255 case Bytecodes::_lstore_0: store_two(current, 0); break; 256 case Bytecodes::_lstore_1: store_two(current, 1); break; 257 case Bytecodes::_lstore_2: store_two(current, 2); break; 258 case Bytecodes::_lstore_3: store_two(current, 3); break; 259 case Bytecodes::_fstore_0: store_one(current, 0); break; 260 case Bytecodes::_fstore_1: store_one(current, 1); break; 261 case Bytecodes::_fstore_2: store_one(current, 2); break; 262 case Bytecodes::_fstore_3: store_one(current, 3); break; 263 case Bytecodes::_dstore_0: store_two(current, 0); break; 264 case Bytecodes::_dstore_1: store_two(current, 1); break; 265 case Bytecodes::_dstore_2: store_two(current, 2); break; 266 case Bytecodes::_dstore_3: store_two(current, 3); break; 267 case Bytecodes::_astore_0: store_one(current, 0); break; 268 case Bytecodes::_astore_1: store_one(current, 1); break; 269 case Bytecodes::_astore_2: store_one(current, 2); break; 270 case Bytecodes::_astore_3: store_one(current, 3); break; 271 272 // track bytecodes that affect the control flow 273 case Bytecodes::_athrow: // fall through 274 case Bytecodes::_ret: // fall through 275 case Bytecodes::_ireturn: // fall through 276 case Bytecodes::_lreturn: // fall through 277 case Bytecodes::_freturn: // fall through 278 case Bytecodes::_dreturn: // fall through 279 case Bytecodes::_areturn: // fall through 280 case Bytecodes::_return: 281 current = NULL; 282 break; 283 284 case Bytecodes::_ifeq: // fall through 285 case Bytecodes::_ifne: // fall through 286 case Bytecodes::_iflt: // fall through 287 case Bytecodes::_ifge: // fall through 288 case Bytecodes::_ifgt: // fall through 289 case Bytecodes::_ifle: // fall through 290 case Bytecodes::_if_icmpeq: // fall through 291 case Bytecodes::_if_icmpne: // fall through 292 case Bytecodes::_if_icmplt: // fall through 293 case Bytecodes::_if_icmpge: // fall through 294 case Bytecodes::_if_icmpgt: // fall through 295 case Bytecodes::_if_icmple: // fall through 296 case Bytecodes::_if_acmpeq: // fall through 297 case Bytecodes::_if_acmpne: // fall through 298 case Bytecodes::_ifnull: // fall through 299 case Bytecodes::_ifnonnull: 300 make_block_at(s.next_bci(), current); 301 make_block_at(s.get_dest(), current); 302 current = NULL; 303 break; 304 305 case Bytecodes::_goto: 306 make_block_at(s.get_dest(), current); 307 current = NULL; 308 break; 309 310 case Bytecodes::_goto_w: 311 make_block_at(s.get_far_dest(), current); 312 current = NULL; 313 break; 314 315 case Bytecodes::_jsr: 316 handle_jsr(current, s.get_dest(), s.next_bci()); 317 current = NULL; 318 break; 319 320 case Bytecodes::_jsr_w: 321 handle_jsr(current, s.get_far_dest(), s.next_bci()); 322 current = NULL; 323 break; 324 325 case Bytecodes::_tableswitch: { 326 // set block for each case 327 Bytecode_tableswitch sw(&s); 328 int l = sw.length(); 329 for (int i = 0; i < l; i++) { 330 make_block_at(cur_bci + sw.dest_offset_at(i), current); 331 } 332 make_block_at(cur_bci + sw.default_offset(), current); 333 current = NULL; 334 break; 335 } 336 337 case Bytecodes::_lookupswitch: { 338 // set block for each case 339 Bytecode_lookupswitch sw(&s); 340 int l = sw.number_of_pairs(); 341 for (int i = 0; i < l; i++) { 342 make_block_at(cur_bci + sw.pair_at(i).offset(), current); 343 } 344 make_block_at(cur_bci + sw.default_offset(), current); 345 current = NULL; 346 break; 347 } 348 } 349 } 350} 351 352 353void BlockListBuilder::mark_loops() { 354 ResourceMark rm; 355 356 _active = BitMap(BlockBegin::number_of_blocks()); _active.clear(); 357 _visited = BitMap(BlockBegin::number_of_blocks()); _visited.clear(); 358 _loop_map = intArray(BlockBegin::number_of_blocks(), 0); 359 _next_loop_index = 0; 360 _next_block_number = _blocks.length(); 361 362 // recursively iterate the control flow graph 363 mark_loops(_bci2block->at(0), false); 364 assert(_next_block_number >= 0, "invalid block numbers"); 365} 366 367void BlockListBuilder::make_loop_header(BlockBegin* block) { 368 if (block->is_set(BlockBegin::exception_entry_flag)) { 369 // exception edges may look like loops but don't mark them as such 370 // since it screws up block ordering. 371 return; 372 } 373 if (!block->is_set(BlockBegin::parser_loop_header_flag)) { 374 block->set(BlockBegin::parser_loop_header_flag); 375 376 assert(_loop_map.at(block->block_id()) == 0, "must not be set yet"); 377 assert(0 <= _next_loop_index && _next_loop_index < BitsPerInt, "_next_loop_index is used as a bit-index in integer"); 378 _loop_map.at_put(block->block_id(), 1 << _next_loop_index); 379 if (_next_loop_index < 31) _next_loop_index++; 380 } else { 381 // block already marked as loop header 382 assert(is_power_of_2((unsigned int)_loop_map.at(block->block_id())), "exactly one bit must be set"); 383 } 384} 385 386int BlockListBuilder::mark_loops(BlockBegin* block, bool in_subroutine) { 387 int block_id = block->block_id(); 388 389 if (_visited.at(block_id)) { 390 if (_active.at(block_id)) { 391 // reached block via backward branch 392 make_loop_header(block); 393 } 394 // return cached loop information for this block 395 return _loop_map.at(block_id); 396 } 397 398 if (block->is_set(BlockBegin::subroutine_entry_flag)) { 399 in_subroutine = true; 400 } 401 402 // set active and visited bits before successors are processed 403 _visited.set_bit(block_id); 404 _active.set_bit(block_id); 405 406 intptr_t loop_state = 0; 407 for (int i = block->number_of_sux() - 1; i >= 0; i--) { 408 // recursively process all successors 409 loop_state |= mark_loops(block->sux_at(i), in_subroutine); 410 } 411 412 // clear active-bit after all successors are processed 413 _active.clear_bit(block_id); 414 415 // reverse-post-order numbering of all blocks 416 block->set_depth_first_number(_next_block_number); 417 _next_block_number--; 418 419 if (loop_state != 0 || in_subroutine ) { 420 // block is contained at least in one loop, so phi functions are necessary 421 // phi functions are also necessary for all locals stored in a subroutine 422 scope()->requires_phi_function().set_union(block->stores_to_locals()); 423 } 424 425 if (block->is_set(BlockBegin::parser_loop_header_flag)) { 426 int header_loop_state = _loop_map.at(block_id); 427 assert(is_power_of_2((unsigned)header_loop_state), "exactly one bit must be set"); 428 429 // If the highest bit is set (i.e. when integer value is negative), the method 430 // has 32 or more loops. This bit is never cleared because it is used for multiple loops 431 if (header_loop_state >= 0) { 432 clear_bits(loop_state, header_loop_state); 433 } 434 } 435 436 // cache and return loop information for this block 437 _loop_map.at_put(block_id, loop_state); 438 return loop_state; 439} 440 441 442#ifndef PRODUCT 443 444int compare_depth_first(BlockBegin** a, BlockBegin** b) { 445 return (*a)->depth_first_number() - (*b)->depth_first_number(); 446} 447 448void BlockListBuilder::print() { 449 tty->print("----- initial block list of BlockListBuilder for method "); 450 method()->print_short_name(); 451 tty->cr(); 452 453 // better readability if blocks are sorted in processing order 454 _blocks.sort(compare_depth_first); 455 456 for (int i = 0; i < _blocks.length(); i++) { 457 BlockBegin* cur = _blocks.at(i); 458 tty->print("%4d: B%-4d bci: %-4d preds: %-4d ", cur->depth_first_number(), cur->block_id(), cur->bci(), cur->total_preds()); 459 460 tty->print(cur->is_set(BlockBegin::std_entry_flag) ? " std" : " "); 461 tty->print(cur->is_set(BlockBegin::osr_entry_flag) ? " osr" : " "); 462 tty->print(cur->is_set(BlockBegin::exception_entry_flag) ? " ex" : " "); 463 tty->print(cur->is_set(BlockBegin::subroutine_entry_flag) ? " sr" : " "); 464 tty->print(cur->is_set(BlockBegin::parser_loop_header_flag) ? " lh" : " "); 465 466 if (cur->number_of_sux() > 0) { 467 tty->print(" sux: "); 468 for (int j = 0; j < cur->number_of_sux(); j++) { 469 BlockBegin* sux = cur->sux_at(j); 470 tty->print("B%d ", sux->block_id()); 471 } 472 } 473 tty->cr(); 474 } 475} 476 477#endif 478 479 480// A simple growable array of Values indexed by ciFields 481class FieldBuffer: public CompilationResourceObj { 482 private: 483 GrowableArray<Value> _values; 484 485 public: 486 FieldBuffer() {} 487 488 void kill() { 489 _values.trunc_to(0); 490 } 491 492 Value at(ciField* field) { 493 assert(field->holder()->is_loaded(), "must be a loaded field"); 494 int offset = field->offset(); 495 if (offset < _values.length()) { 496 return _values.at(offset); 497 } else { 498 return NULL; 499 } 500 } 501 502 void at_put(ciField* field, Value value) { 503 assert(field->holder()->is_loaded(), "must be a loaded field"); 504 int offset = field->offset(); 505 _values.at_put_grow(offset, value, NULL); 506 } 507 508}; 509 510 511// MemoryBuffer is fairly simple model of the current state of memory. 512// It partitions memory into several pieces. The first piece is 513// generic memory where little is known about the owner of the memory. 514// This is conceptually represented by the tuple <O, F, V> which says 515// that the field F of object O has value V. This is flattened so 516// that F is represented by the offset of the field and the parallel 517// arrays _objects and _values are used for O and V. Loads of O.F can 518// simply use V. Newly allocated objects are kept in a separate list 519// along with a parallel array for each object which represents the 520// current value of its fields. Stores of the default value to fields 521// which have never been stored to before are eliminated since they 522// are redundant. Once newly allocated objects are stored into 523// another object or they are passed out of the current compile they 524// are treated like generic memory. 525 526class MemoryBuffer: public CompilationResourceObj { 527 private: 528 FieldBuffer _values; 529 GrowableArray<Value> _objects; 530 GrowableArray<Value> _newobjects; 531 GrowableArray<FieldBuffer*> _fields; 532 533 public: 534 MemoryBuffer() {} 535 536 StoreField* store(StoreField* st) { 537 if (!EliminateFieldAccess) { 538 return st; 539 } 540 541 Value object = st->obj(); 542 Value value = st->value(); 543 ciField* field = st->field(); 544 if (field->holder()->is_loaded()) { 545 int offset = field->offset(); 546 int index = _newobjects.find(object); 547 if (index != -1) { 548 // newly allocated object with no other stores performed on this field 549 FieldBuffer* buf = _fields.at(index); 550 if (buf->at(field) == NULL && is_default_value(value)) { 551#ifndef PRODUCT 552 if (PrintIRDuringConstruction && Verbose) { 553 tty->print_cr("Eliminated store for object %d:", index); 554 st->print_line(); 555 } 556#endif 557 return NULL; 558 } else { 559 buf->at_put(field, value); 560 } 561 } else { 562 _objects.at_put_grow(offset, object, NULL); 563 _values.at_put(field, value); 564 } 565 566 store_value(value); 567 } else { 568 // if we held onto field names we could alias based on names but 569 // we don't know what's being stored to so kill it all. 570 kill(); 571 } 572 return st; 573 } 574 575 576 // return true if this value correspond to the default value of a field. 577 bool is_default_value(Value value) { 578 Constant* con = value->as_Constant(); 579 if (con) { 580 switch (con->type()->tag()) { 581 case intTag: return con->type()->as_IntConstant()->value() == 0; 582 case longTag: return con->type()->as_LongConstant()->value() == 0; 583 case floatTag: return jint_cast(con->type()->as_FloatConstant()->value()) == 0; 584 case doubleTag: return jlong_cast(con->type()->as_DoubleConstant()->value()) == jlong_cast(0); 585 case objectTag: return con->type() == objectNull; 586 default: ShouldNotReachHere(); 587 } 588 } 589 return false; 590 } 591 592 593 // return either the actual value of a load or the load itself 594 Value load(LoadField* load) { 595 if (!EliminateFieldAccess) { 596 return load; 597 } 598 599 if (RoundFPResults && UseSSE < 2 && load->type()->is_float_kind()) { 600 // can't skip load since value might get rounded as a side effect 601 return load; 602 } 603 604 ciField* field = load->field(); 605 Value object = load->obj(); 606 if (field->holder()->is_loaded() && !field->is_volatile()) { 607 int offset = field->offset(); 608 Value result = NULL; 609 int index = _newobjects.find(object); 610 if (index != -1) { 611 result = _fields.at(index)->at(field); 612 } else if (_objects.at_grow(offset, NULL) == object) { 613 result = _values.at(field); 614 } 615 if (result != NULL) { 616#ifndef PRODUCT 617 if (PrintIRDuringConstruction && Verbose) { 618 tty->print_cr("Eliminated load: "); 619 load->print_line(); 620 } 621#endif 622 assert(result->type()->tag() == load->type()->tag(), "wrong types"); 623 return result; 624 } 625 } 626 return load; 627 } 628 629 // Record this newly allocated object 630 void new_instance(NewInstance* object) { 631 int index = _newobjects.length(); 632 _newobjects.append(object); 633 if (_fields.at_grow(index, NULL) == NULL) { 634 _fields.at_put(index, new FieldBuffer()); 635 } else { 636 _fields.at(index)->kill(); 637 } 638 } 639 640 void store_value(Value value) { 641 int index = _newobjects.find(value); 642 if (index != -1) { 643 // stored a newly allocated object into another object. 644 // Assume we've lost track of it as separate slice of memory. 645 // We could do better by keeping track of whether individual 646 // fields could alias each other. 647 _newobjects.remove_at(index); 648 // pull out the field info and store it at the end up the list 649 // of field info list to be reused later. 650 _fields.append(_fields.at(index)); 651 _fields.remove_at(index); 652 } 653 } 654 655 void kill() { 656 _newobjects.trunc_to(0); 657 _objects.trunc_to(0); 658 _values.kill(); 659 } 660}; 661 662 663// Implementation of GraphBuilder's ScopeData 664 665GraphBuilder::ScopeData::ScopeData(ScopeData* parent) 666 : _parent(parent) 667 , _bci2block(NULL) 668 , _scope(NULL) 669 , _has_handler(false) 670 , _stream(NULL) 671 , _work_list(NULL) 672 , _parsing_jsr(false) 673 , _jsr_xhandlers(NULL) 674 , _caller_stack_size(-1) 675 , _continuation(NULL) 676 , _num_returns(0) 677 , _cleanup_block(NULL) 678 , _cleanup_return_prev(NULL) 679 , _cleanup_state(NULL) 680{ 681 if (parent != NULL) { 682 _max_inline_size = (intx) ((float) NestedInliningSizeRatio * (float) parent->max_inline_size() / 100.0f); 683 } else { 684 _max_inline_size = MaxInlineSize; 685 } 686 if (_max_inline_size < MaxTrivialSize) { 687 _max_inline_size = MaxTrivialSize; 688 } 689} 690 691 692void GraphBuilder::kill_all() { 693 if (UseLocalValueNumbering) { 694 vmap()->kill_all(); 695 } 696 _memory->kill(); 697} 698 699 700BlockBegin* GraphBuilder::ScopeData::block_at(int bci) { 701 if (parsing_jsr()) { 702 // It is necessary to clone all blocks associated with a 703 // subroutine, including those for exception handlers in the scope 704 // of the method containing the jsr (because those exception 705 // handlers may contain ret instructions in some cases). 706 BlockBegin* block = bci2block()->at(bci); 707 if (block != NULL && block == parent()->bci2block()->at(bci)) { 708 BlockBegin* new_block = new BlockBegin(block->bci()); 709#ifndef PRODUCT 710 if (PrintInitialBlockList) { 711 tty->print_cr("CFG: cloned block %d (bci %d) as block %d for jsr", 712 block->block_id(), block->bci(), new_block->block_id()); 713 } 714#endif 715 // copy data from cloned blocked 716 new_block->set_depth_first_number(block->depth_first_number()); 717 if (block->is_set(BlockBegin::parser_loop_header_flag)) new_block->set(BlockBegin::parser_loop_header_flag); 718 // Preserve certain flags for assertion checking 719 if (block->is_set(BlockBegin::subroutine_entry_flag)) new_block->set(BlockBegin::subroutine_entry_flag); 720 if (block->is_set(BlockBegin::exception_entry_flag)) new_block->set(BlockBegin::exception_entry_flag); 721 722 // copy was_visited_flag to allow early detection of bailouts 723 // if a block that is used in a jsr has already been visited before, 724 // it is shared between the normal control flow and a subroutine 725 // BlockBegin::try_merge returns false when the flag is set, this leads 726 // to a compilation bailout 727 if (block->is_set(BlockBegin::was_visited_flag)) new_block->set(BlockBegin::was_visited_flag); 728 729 bci2block()->at_put(bci, new_block); 730 block = new_block; 731 } 732 return block; 733 } else { 734 return bci2block()->at(bci); 735 } 736} 737 738 739XHandlers* GraphBuilder::ScopeData::xhandlers() const { 740 if (_jsr_xhandlers == NULL) { 741 assert(!parsing_jsr(), ""); 742 return scope()->xhandlers(); 743 } 744 assert(parsing_jsr(), ""); 745 return _jsr_xhandlers; 746} 747 748 749void GraphBuilder::ScopeData::set_scope(IRScope* scope) { 750 _scope = scope; 751 bool parent_has_handler = false; 752 if (parent() != NULL) { 753 parent_has_handler = parent()->has_handler(); 754 } 755 _has_handler = parent_has_handler || scope->xhandlers()->has_handlers(); 756} 757 758 759void GraphBuilder::ScopeData::set_inline_cleanup_info(BlockBegin* block, 760 Instruction* return_prev, 761 ValueStack* return_state) { 762 _cleanup_block = block; 763 _cleanup_return_prev = return_prev; 764 _cleanup_state = return_state; 765} 766 767 768void GraphBuilder::ScopeData::add_to_work_list(BlockBegin* block) { 769 if (_work_list == NULL) { 770 _work_list = new BlockList(); 771 } 772 773 if (!block->is_set(BlockBegin::is_on_work_list_flag)) { 774 // Do not start parsing the continuation block while in a 775 // sub-scope 776 if (parsing_jsr()) { 777 if (block == jsr_continuation()) { 778 return; 779 } 780 } else { 781 if (block == continuation()) { 782 return; 783 } 784 } 785 block->set(BlockBegin::is_on_work_list_flag); 786 _work_list->push(block); 787 788 sort_top_into_worklist(_work_list, block); 789 } 790} 791 792 793void GraphBuilder::sort_top_into_worklist(BlockList* worklist, BlockBegin* top) { 794 assert(worklist->top() == top, ""); 795 // sort block descending into work list 796 const int dfn = top->depth_first_number(); 797 assert(dfn != -1, "unknown depth first number"); 798 int i = worklist->length()-2; 799 while (i >= 0) { 800 BlockBegin* b = worklist->at(i); 801 if (b->depth_first_number() < dfn) { 802 worklist->at_put(i+1, b); 803 } else { 804 break; 805 } 806 i --; 807 } 808 if (i >= -1) worklist->at_put(i + 1, top); 809} 810 811 812BlockBegin* GraphBuilder::ScopeData::remove_from_work_list() { 813 if (is_work_list_empty()) { 814 return NULL; 815 } 816 return _work_list->pop(); 817} 818 819 820bool GraphBuilder::ScopeData::is_work_list_empty() const { 821 return (_work_list == NULL || _work_list->length() == 0); 822} 823 824 825void GraphBuilder::ScopeData::setup_jsr_xhandlers() { 826 assert(parsing_jsr(), ""); 827 // clone all the exception handlers from the scope 828 XHandlers* handlers = new XHandlers(scope()->xhandlers()); 829 const int n = handlers->length(); 830 for (int i = 0; i < n; i++) { 831 // The XHandlers need to be adjusted to dispatch to the cloned 832 // handler block instead of the default one but the synthetic 833 // unlocker needs to be handled specially. The synthetic unlocker 834 // should be left alone since there can be only one and all code 835 // should dispatch to the same one. 836 XHandler* h = handlers->handler_at(i); 837 assert(h->handler_bci() != SynchronizationEntryBCI, "must be real"); 838 h->set_entry_block(block_at(h->handler_bci())); 839 } 840 _jsr_xhandlers = handlers; 841} 842 843 844int GraphBuilder::ScopeData::num_returns() { 845 if (parsing_jsr()) { 846 return parent()->num_returns(); 847 } 848 return _num_returns; 849} 850 851 852void GraphBuilder::ScopeData::incr_num_returns() { 853 if (parsing_jsr()) { 854 parent()->incr_num_returns(); 855 } else { 856 ++_num_returns; 857 } 858} 859 860 861// Implementation of GraphBuilder 862 863#define INLINE_BAILOUT(msg) { inline_bailout(msg); return false; } 864 865 866void GraphBuilder::load_constant() { 867 ciConstant con = stream()->get_constant(); 868 if (con.basic_type() == T_ILLEGAL) { 869 BAILOUT("could not resolve a constant"); 870 } else { 871 ValueType* t = illegalType; 872 ValueStack* patch_state = NULL; 873 switch (con.basic_type()) { 874 case T_BOOLEAN: t = new IntConstant (con.as_boolean()); break; 875 case T_BYTE : t = new IntConstant (con.as_byte ()); break; 876 case T_CHAR : t = new IntConstant (con.as_char ()); break; 877 case T_SHORT : t = new IntConstant (con.as_short ()); break; 878 case T_INT : t = new IntConstant (con.as_int ()); break; 879 case T_LONG : t = new LongConstant (con.as_long ()); break; 880 case T_FLOAT : t = new FloatConstant (con.as_float ()); break; 881 case T_DOUBLE : t = new DoubleConstant (con.as_double ()); break; 882 case T_ARRAY : t = new ArrayConstant (con.as_object ()->as_array ()); break; 883 case T_OBJECT : 884 { 885 ciObject* obj = con.as_object(); 886 if (!obj->is_loaded() 887 || (PatchALot && obj->klass() != ciEnv::current()->String_klass())) { 888 patch_state = copy_state_before(); 889 t = new ObjectConstant(obj); 890 } else { 891 assert(obj->is_instance(), "must be java_mirror of klass"); 892 t = new InstanceConstant(obj->as_instance()); 893 } 894 break; 895 } 896 default : ShouldNotReachHere(); 897 } 898 Value x; 899 if (patch_state != NULL) { 900 x = new Constant(t, patch_state); 901 } else { 902 x = new Constant(t); 903 } 904 push(t, append(x)); 905 } 906} 907 908 909void GraphBuilder::load_local(ValueType* type, int index) { 910 Value x = state()->local_at(index); 911 assert(x != NULL && !x->type()->is_illegal(), "access of illegal local variable"); 912 push(type, x); 913} 914 915 916void GraphBuilder::store_local(ValueType* type, int index) { 917 Value x = pop(type); 918 store_local(state(), x, index); 919} 920 921 922void GraphBuilder::store_local(ValueStack* state, Value x, int index) { 923 if (parsing_jsr()) { 924 // We need to do additional tracking of the location of the return 925 // address for jsrs since we don't handle arbitrary jsr/ret 926 // constructs. Here we are figuring out in which circumstances we 927 // need to bail out. 928 if (x->type()->is_address()) { 929 scope_data()->set_jsr_return_address_local(index); 930 931 // Also check parent jsrs (if any) at this time to see whether 932 // they are using this local. We don't handle skipping over a 933 // ret. 934 for (ScopeData* cur_scope_data = scope_data()->parent(); 935 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope(); 936 cur_scope_data = cur_scope_data->parent()) { 937 if (cur_scope_data->jsr_return_address_local() == index) { 938 BAILOUT("subroutine overwrites return address from previous subroutine"); 939 } 940 } 941 } else if (index == scope_data()->jsr_return_address_local()) { 942 scope_data()->set_jsr_return_address_local(-1); 943 } 944 } 945 946 state->store_local(index, round_fp(x)); 947} 948 949 950void GraphBuilder::load_indexed(BasicType type) { 951 // In case of in block code motion in range check elimination 952 ValueStack* state_before = copy_state_indexed_access(); 953 compilation()->set_has_access_indexed(true); 954 Value index = ipop(); 955 Value array = apop(); 956 Value length = NULL; 957 if (CSEArrayLength || 958 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) || 959 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) { 960 length = append(new ArrayLength(array, state_before)); 961 } 962 push(as_ValueType(type), append(new LoadIndexed(array, index, length, type, state_before))); 963} 964 965 966void GraphBuilder::store_indexed(BasicType type) { 967 // In case of in block code motion in range check elimination 968 ValueStack* state_before = copy_state_indexed_access(); 969 compilation()->set_has_access_indexed(true); 970 Value value = pop(as_ValueType(type)); 971 Value index = ipop(); 972 Value array = apop(); 973 Value length = NULL; 974 if (CSEArrayLength || 975 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) || 976 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant())) { 977 length = append(new ArrayLength(array, state_before)); 978 } 979 StoreIndexed* result = new StoreIndexed(array, index, length, type, value, state_before); 980 append(result); 981 _memory->store_value(value); 982 983 if (type == T_OBJECT && is_profiling()) { 984 // Note that we'd collect profile data in this method if we wanted it. 985 compilation()->set_would_profile(true); 986 987 if (profile_checkcasts()) { 988 result->set_profiled_method(method()); 989 result->set_profiled_bci(bci()); 990 result->set_should_profile(true); 991 } 992 } 993} 994 995 996void GraphBuilder::stack_op(Bytecodes::Code code) { 997 switch (code) { 998 case Bytecodes::_pop: 999 { state()->raw_pop(); 1000 } 1001 break; 1002 case Bytecodes::_pop2: 1003 { state()->raw_pop(); 1004 state()->raw_pop(); 1005 } 1006 break; 1007 case Bytecodes::_dup: 1008 { Value w = state()->raw_pop(); 1009 state()->raw_push(w); 1010 state()->raw_push(w); 1011 } 1012 break; 1013 case Bytecodes::_dup_x1: 1014 { Value w1 = state()->raw_pop(); 1015 Value w2 = state()->raw_pop(); 1016 state()->raw_push(w1); 1017 state()->raw_push(w2); 1018 state()->raw_push(w1); 1019 } 1020 break; 1021 case Bytecodes::_dup_x2: 1022 { Value w1 = state()->raw_pop(); 1023 Value w2 = state()->raw_pop(); 1024 Value w3 = state()->raw_pop(); 1025 state()->raw_push(w1); 1026 state()->raw_push(w3); 1027 state()->raw_push(w2); 1028 state()->raw_push(w1); 1029 } 1030 break; 1031 case Bytecodes::_dup2: 1032 { Value w1 = state()->raw_pop(); 1033 Value w2 = state()->raw_pop(); 1034 state()->raw_push(w2); 1035 state()->raw_push(w1); 1036 state()->raw_push(w2); 1037 state()->raw_push(w1); 1038 } 1039 break; 1040 case Bytecodes::_dup2_x1: 1041 { Value w1 = state()->raw_pop(); 1042 Value w2 = state()->raw_pop(); 1043 Value w3 = state()->raw_pop(); 1044 state()->raw_push(w2); 1045 state()->raw_push(w1); 1046 state()->raw_push(w3); 1047 state()->raw_push(w2); 1048 state()->raw_push(w1); 1049 } 1050 break; 1051 case Bytecodes::_dup2_x2: 1052 { Value w1 = state()->raw_pop(); 1053 Value w2 = state()->raw_pop(); 1054 Value w3 = state()->raw_pop(); 1055 Value w4 = state()->raw_pop(); 1056 state()->raw_push(w2); 1057 state()->raw_push(w1); 1058 state()->raw_push(w4); 1059 state()->raw_push(w3); 1060 state()->raw_push(w2); 1061 state()->raw_push(w1); 1062 } 1063 break; 1064 case Bytecodes::_swap: 1065 { Value w1 = state()->raw_pop(); 1066 Value w2 = state()->raw_pop(); 1067 state()->raw_push(w1); 1068 state()->raw_push(w2); 1069 } 1070 break; 1071 default: 1072 ShouldNotReachHere(); 1073 break; 1074 } 1075} 1076 1077 1078void GraphBuilder::arithmetic_op(ValueType* type, Bytecodes::Code code, ValueStack* state_before) { 1079 Value y = pop(type); 1080 Value x = pop(type); 1081 // NOTE: strictfp can be queried from current method since we don't 1082 // inline methods with differing strictfp bits 1083 Value res = new ArithmeticOp(code, x, y, method()->is_strict(), state_before); 1084 // Note: currently single-precision floating-point rounding on Intel is handled at the LIRGenerator level 1085 res = append(res); 1086 if (method()->is_strict()) { 1087 res = round_fp(res); 1088 } 1089 push(type, res); 1090} 1091 1092 1093void GraphBuilder::negate_op(ValueType* type) { 1094 push(type, append(new NegateOp(pop(type)))); 1095} 1096 1097 1098void GraphBuilder::shift_op(ValueType* type, Bytecodes::Code code) { 1099 Value s = ipop(); 1100 Value x = pop(type); 1101 // try to simplify 1102 // Note: This code should go into the canonicalizer as soon as it can 1103 // can handle canonicalized forms that contain more than one node. 1104 if (CanonicalizeNodes && code == Bytecodes::_iushr) { 1105 // pattern: x >>> s 1106 IntConstant* s1 = s->type()->as_IntConstant(); 1107 if (s1 != NULL) { 1108 // pattern: x >>> s1, with s1 constant 1109 ShiftOp* l = x->as_ShiftOp(); 1110 if (l != NULL && l->op() == Bytecodes::_ishl) { 1111 // pattern: (a << b) >>> s1 1112 IntConstant* s0 = l->y()->type()->as_IntConstant(); 1113 if (s0 != NULL) { 1114 // pattern: (a << s0) >>> s1 1115 const int s0c = s0->value() & 0x1F; // only the low 5 bits are significant for shifts 1116 const int s1c = s1->value() & 0x1F; // only the low 5 bits are significant for shifts 1117 if (s0c == s1c) { 1118 if (s0c == 0) { 1119 // pattern: (a << 0) >>> 0 => simplify to: a 1120 ipush(l->x()); 1121 } else { 1122 // pattern: (a << s0c) >>> s0c => simplify to: a & m, with m constant 1123 assert(0 < s0c && s0c < BitsPerInt, "adjust code below to handle corner cases"); 1124 const int m = (1 << (BitsPerInt - s0c)) - 1; 1125 Value s = append(new Constant(new IntConstant(m))); 1126 ipush(append(new LogicOp(Bytecodes::_iand, l->x(), s))); 1127 } 1128 return; 1129 } 1130 } 1131 } 1132 } 1133 } 1134 // could not simplify 1135 push(type, append(new ShiftOp(code, x, s))); 1136} 1137 1138 1139void GraphBuilder::logic_op(ValueType* type, Bytecodes::Code code) { 1140 Value y = pop(type); 1141 Value x = pop(type); 1142 push(type, append(new LogicOp(code, x, y))); 1143} 1144 1145 1146void GraphBuilder::compare_op(ValueType* type, Bytecodes::Code code) { 1147 ValueStack* state_before = copy_state_before(); 1148 Value y = pop(type); 1149 Value x = pop(type); 1150 ipush(append(new CompareOp(code, x, y, state_before))); 1151} 1152 1153 1154void GraphBuilder::convert(Bytecodes::Code op, BasicType from, BasicType to) { 1155 push(as_ValueType(to), append(new Convert(op, pop(as_ValueType(from)), as_ValueType(to)))); 1156} 1157 1158 1159void GraphBuilder::increment() { 1160 int index = stream()->get_index(); 1161 int delta = stream()->is_wide() ? (signed short)Bytes::get_Java_u2(stream()->cur_bcp() + 4) : (signed char)(stream()->cur_bcp()[2]); 1162 load_local(intType, index); 1163 ipush(append(new Constant(new IntConstant(delta)))); 1164 arithmetic_op(intType, Bytecodes::_iadd); 1165 store_local(intType, index); 1166} 1167 1168 1169void GraphBuilder::_goto(int from_bci, int to_bci) { 1170 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci); 1171 if (is_profiling()) { 1172 compilation()->set_would_profile(true); 1173 x->set_profiled_bci(bci()); 1174 if (profile_branches()) { 1175 x->set_profiled_method(method()); 1176 x->set_should_profile(true); 1177 } 1178 } 1179 append(x); 1180} 1181 1182 1183void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) { 1184 BlockBegin* tsux = block_at(stream()->get_dest()); 1185 BlockBegin* fsux = block_at(stream()->next_bci()); 1186 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci(); 1187 // In case of loop invariant code motion or predicate insertion 1188 // before the body of a loop the state is needed 1189 Instruction *i = append(new If(x, cond, false, y, tsux, fsux, (is_bb || compilation()->is_optimistic()) ? state_before : NULL, is_bb)); 1190 1191 assert(i->as_Goto() == NULL || 1192 (i->as_Goto()->sux_at(0) == tsux && i->as_Goto()->is_safepoint() == tsux->bci() < stream()->cur_bci()) || 1193 (i->as_Goto()->sux_at(0) == fsux && i->as_Goto()->is_safepoint() == fsux->bci() < stream()->cur_bci()), 1194 "safepoint state of Goto returned by canonicalizer incorrect"); 1195 1196 if (is_profiling()) { 1197 If* if_node = i->as_If(); 1198 if (if_node != NULL) { 1199 // Note that we'd collect profile data in this method if we wanted it. 1200 compilation()->set_would_profile(true); 1201 // At level 2 we need the proper bci to count backedges 1202 if_node->set_profiled_bci(bci()); 1203 if (profile_branches()) { 1204 // Successors can be rotated by the canonicalizer, check for this case. 1205 if_node->set_profiled_method(method()); 1206 if_node->set_should_profile(true); 1207 if (if_node->tsux() == fsux) { 1208 if_node->set_swapped(true); 1209 } 1210 } 1211 return; 1212 } 1213 1214 // Check if this If was reduced to Goto. 1215 Goto *goto_node = i->as_Goto(); 1216 if (goto_node != NULL) { 1217 compilation()->set_would_profile(true); 1218 goto_node->set_profiled_bci(bci()); 1219 if (profile_branches()) { 1220 goto_node->set_profiled_method(method()); 1221 goto_node->set_should_profile(true); 1222 // Find out which successor is used. 1223 if (goto_node->default_sux() == tsux) { 1224 goto_node->set_direction(Goto::taken); 1225 } else if (goto_node->default_sux() == fsux) { 1226 goto_node->set_direction(Goto::not_taken); 1227 } else { 1228 ShouldNotReachHere(); 1229 } 1230 } 1231 return; 1232 } 1233 } 1234} 1235 1236 1237void GraphBuilder::if_zero(ValueType* type, If::Condition cond) { 1238 Value y = append(new Constant(intZero)); 1239 ValueStack* state_before = copy_state_before(); 1240 Value x = ipop(); 1241 if_node(x, cond, y, state_before); 1242} 1243 1244 1245void GraphBuilder::if_null(ValueType* type, If::Condition cond) { 1246 Value y = append(new Constant(objectNull)); 1247 ValueStack* state_before = copy_state_before(); 1248 Value x = apop(); 1249 if_node(x, cond, y, state_before); 1250} 1251 1252 1253void GraphBuilder::if_same(ValueType* type, If::Condition cond) { 1254 ValueStack* state_before = copy_state_before(); 1255 Value y = pop(type); 1256 Value x = pop(type); 1257 if_node(x, cond, y, state_before); 1258} 1259 1260 1261void GraphBuilder::jsr(int dest) { 1262 // We only handle well-formed jsrs (those which are "block-structured"). 1263 // If the bytecodes are strange (jumping out of a jsr block) then we 1264 // might end up trying to re-parse a block containing a jsr which 1265 // has already been activated. Watch for this case and bail out. 1266 for (ScopeData* cur_scope_data = scope_data(); 1267 cur_scope_data != NULL && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope(); 1268 cur_scope_data = cur_scope_data->parent()) { 1269 if (cur_scope_data->jsr_entry_bci() == dest) { 1270 BAILOUT("too-complicated jsr/ret structure"); 1271 } 1272 } 1273 1274 push(addressType, append(new Constant(new AddressConstant(next_bci())))); 1275 if (!try_inline_jsr(dest)) { 1276 return; // bailed out while parsing and inlining subroutine 1277 } 1278} 1279 1280 1281void GraphBuilder::ret(int local_index) { 1282 if (!parsing_jsr()) BAILOUT("ret encountered while not parsing subroutine"); 1283 1284 if (local_index != scope_data()->jsr_return_address_local()) { 1285 BAILOUT("can not handle complicated jsr/ret constructs"); 1286 } 1287 1288 // Rets simply become (NON-SAFEPOINT) gotos to the jsr continuation 1289 append(new Goto(scope_data()->jsr_continuation(), false)); 1290} 1291 1292 1293void GraphBuilder::table_switch() { 1294 Bytecode_tableswitch sw(stream()); 1295 const int l = sw.length(); 1296 if (CanonicalizeNodes && l == 1) { 1297 // total of 2 successors => use If instead of switch 1298 // Note: This code should go into the canonicalizer as soon as it can 1299 // can handle canonicalized forms that contain more than one node. 1300 Value key = append(new Constant(new IntConstant(sw.low_key()))); 1301 BlockBegin* tsux = block_at(bci() + sw.dest_offset_at(0)); 1302 BlockBegin* fsux = block_at(bci() + sw.default_offset()); 1303 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci(); 1304 // In case of loop invariant code motion or predicate insertion 1305 // before the body of a loop the state is needed 1306 ValueStack* state_before = copy_state_if_bb(is_bb); 1307 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb)); 1308 } else { 1309 // collect successors 1310 BlockList* sux = new BlockList(l + 1, NULL); 1311 int i; 1312 bool has_bb = false; 1313 for (i = 0; i < l; i++) { 1314 sux->at_put(i, block_at(bci() + sw.dest_offset_at(i))); 1315 if (sw.dest_offset_at(i) < 0) has_bb = true; 1316 } 1317 // add default successor 1318 if (sw.default_offset() < 0) has_bb = true; 1319 sux->at_put(i, block_at(bci() + sw.default_offset())); 1320 // In case of loop invariant code motion or predicate insertion 1321 // before the body of a loop the state is needed 1322 ValueStack* state_before = copy_state_if_bb(has_bb); 1323 Instruction* res = append(new TableSwitch(ipop(), sux, sw.low_key(), state_before, has_bb)); 1324#ifdef ASSERT 1325 if (res->as_Goto()) { 1326 for (i = 0; i < l; i++) { 1327 if (sux->at(i) == res->as_Goto()->sux_at(0)) { 1328 assert(res->as_Goto()->is_safepoint() == sw.dest_offset_at(i) < 0, "safepoint state of Goto returned by canonicalizer incorrect"); 1329 } 1330 } 1331 } 1332#endif 1333 } 1334} 1335 1336 1337void GraphBuilder::lookup_switch() { 1338 Bytecode_lookupswitch sw(stream()); 1339 const int l = sw.number_of_pairs(); 1340 if (CanonicalizeNodes && l == 1) { 1341 // total of 2 successors => use If instead of switch 1342 // Note: This code should go into the canonicalizer as soon as it can 1343 // can handle canonicalized forms that contain more than one node. 1344 // simplify to If 1345 LookupswitchPair pair = sw.pair_at(0); 1346 Value key = append(new Constant(new IntConstant(pair.match()))); 1347 BlockBegin* tsux = block_at(bci() + pair.offset()); 1348 BlockBegin* fsux = block_at(bci() + sw.default_offset()); 1349 bool is_bb = tsux->bci() < bci() || fsux->bci() < bci(); 1350 // In case of loop invariant code motion or predicate insertion 1351 // before the body of a loop the state is needed 1352 ValueStack* state_before = copy_state_if_bb(is_bb);; 1353 append(new If(ipop(), If::eql, true, key, tsux, fsux, state_before, is_bb)); 1354 } else { 1355 // collect successors & keys 1356 BlockList* sux = new BlockList(l + 1, NULL); 1357 intArray* keys = new intArray(l, 0); 1358 int i; 1359 bool has_bb = false; 1360 for (i = 0; i < l; i++) { 1361 LookupswitchPair pair = sw.pair_at(i); 1362 if (pair.offset() < 0) has_bb = true; 1363 sux->at_put(i, block_at(bci() + pair.offset())); 1364 keys->at_put(i, pair.match()); 1365 } 1366 // add default successor 1367 if (sw.default_offset() < 0) has_bb = true; 1368 sux->at_put(i, block_at(bci() + sw.default_offset())); 1369 // In case of loop invariant code motion or predicate insertion 1370 // before the body of a loop the state is needed 1371 ValueStack* state_before = copy_state_if_bb(has_bb); 1372 Instruction* res = append(new LookupSwitch(ipop(), sux, keys, state_before, has_bb)); 1373#ifdef ASSERT 1374 if (res->as_Goto()) { 1375 for (i = 0; i < l; i++) { 1376 if (sux->at(i) == res->as_Goto()->sux_at(0)) { 1377 assert(res->as_Goto()->is_safepoint() == sw.pair_at(i).offset() < 0, "safepoint state of Goto returned by canonicalizer incorrect"); 1378 } 1379 } 1380 } 1381#endif 1382 } 1383} 1384 1385void GraphBuilder::call_register_finalizer() { 1386 // If the receiver requires finalization then emit code to perform 1387 // the registration on return. 1388 1389 // Gather some type information about the receiver 1390 Value receiver = state()->local_at(0); 1391 assert(receiver != NULL, "must have a receiver"); 1392 ciType* declared_type = receiver->declared_type(); 1393 ciType* exact_type = receiver->exact_type(); 1394 if (exact_type == NULL && 1395 receiver->as_Local() && 1396 receiver->as_Local()->java_index() == 0) { 1397 ciInstanceKlass* ik = compilation()->method()->holder(); 1398 if (ik->is_final()) { 1399 exact_type = ik; 1400 } else if (UseCHA && !(ik->has_subklass() || ik->is_interface())) { 1401 // test class is leaf class 1402 compilation()->dependency_recorder()->assert_leaf_type(ik); 1403 exact_type = ik; 1404 } else { 1405 declared_type = ik; 1406 } 1407 } 1408 1409 // see if we know statically that registration isn't required 1410 bool needs_check = true; 1411 if (exact_type != NULL) { 1412 needs_check = exact_type->as_instance_klass()->has_finalizer(); 1413 } else if (declared_type != NULL) { 1414 ciInstanceKlass* ik = declared_type->as_instance_klass(); 1415 if (!Dependencies::has_finalizable_subclass(ik)) { 1416 compilation()->dependency_recorder()->assert_has_no_finalizable_subclasses(ik); 1417 needs_check = false; 1418 } 1419 } 1420 1421 if (needs_check) { 1422 // Perform the registration of finalizable objects. 1423 ValueStack* state_before = copy_state_for_exception(); 1424 load_local(objectType, 0); 1425 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init, 1426 state()->pop_arguments(1), 1427 true, state_before, true)); 1428 } 1429} 1430 1431 1432void GraphBuilder::method_return(Value x) { 1433 if (RegisterFinalizersAtInit && 1434 method()->intrinsic_id() == vmIntrinsics::_Object_init) { 1435 call_register_finalizer(); 1436 } 1437 1438 bool need_mem_bar = false; 1439 if (method()->name() == ciSymbol::object_initializer_name() && 1440 (scope()->wrote_final() || (AlwaysSafeConstructors && scope()->wrote_fields()))) { 1441 need_mem_bar = true; 1442 } 1443 1444 // Check to see whether we are inlining. If so, Return 1445 // instructions become Gotos to the continuation point. 1446 if (continuation() != NULL) { 1447 assert(!method()->is_synchronized() || InlineSynchronizedMethods, "can not inline synchronized methods yet"); 1448 1449 if (compilation()->env()->dtrace_method_probes()) { 1450 // Report exit from inline methods 1451 Values* args = new Values(1); 1452 args->push(append(new Constant(new MethodConstant(method())))); 1453 append(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args)); 1454 } 1455 1456 // If the inlined method is synchronized, the monitor must be 1457 // released before we jump to the continuation block. 1458 if (method()->is_synchronized()) { 1459 assert(state()->locks_size() == 1, "receiver must be locked here"); 1460 monitorexit(state()->lock_at(0), SynchronizationEntryBCI); 1461 } 1462 1463 if (need_mem_bar) { 1464 append(new MemBar(lir_membar_storestore)); 1465 } 1466 1467 // State at end of inlined method is the state of the caller 1468 // without the method parameters on stack, including the 1469 // return value, if any, of the inlined method on operand stack. 1470 int invoke_bci = state()->caller_state()->bci(); 1471 set_state(state()->caller_state()->copy_for_parsing()); 1472 if (x != NULL) { 1473 state()->push(x->type(), x); 1474 if (profile_return() && x->type()->is_object_kind()) { 1475 ciMethod* caller = state()->scope()->method(); 1476 ciMethodData* md = caller->method_data_or_null(); 1477 ciProfileData* data = md->bci_to_data(invoke_bci); 1478 if (data->is_CallTypeData() || data->is_VirtualCallTypeData()) { 1479 bool has_return = data->is_CallTypeData() ? ((ciCallTypeData*)data)->has_return() : ((ciVirtualCallTypeData*)data)->has_return(); 1480 // May not be true in case of an inlined call through a method handle intrinsic. 1481 if (has_return) { 1482 profile_return_type(x, method(), caller, invoke_bci); 1483 } 1484 } 1485 } 1486 } 1487 Goto* goto_callee = new Goto(continuation(), false); 1488 1489 // See whether this is the first return; if so, store off some 1490 // of the state for later examination 1491 if (num_returns() == 0) { 1492 set_inline_cleanup_info(); 1493 } 1494 1495 // The current bci() is in the wrong scope, so use the bci() of 1496 // the continuation point. 1497 append_with_bci(goto_callee, scope_data()->continuation()->bci()); 1498 incr_num_returns(); 1499 return; 1500 } 1501 1502 state()->truncate_stack(0); 1503 if (method()->is_synchronized()) { 1504 // perform the unlocking before exiting the method 1505 Value receiver; 1506 if (!method()->is_static()) { 1507 receiver = _initial_state->local_at(0); 1508 } else { 1509 receiver = append(new Constant(new ClassConstant(method()->holder()))); 1510 } 1511 append_split(new MonitorExit(receiver, state()->unlock())); 1512 } 1513 1514 if (need_mem_bar) { 1515 append(new MemBar(lir_membar_storestore)); 1516 } 1517 1518 append(new Return(x)); 1519} 1520 1521 1522void GraphBuilder::access_field(Bytecodes::Code code) { 1523 bool will_link; 1524 ciField* field = stream()->get_field(will_link); 1525 ciInstanceKlass* holder = field->holder(); 1526 BasicType field_type = field->type()->basic_type(); 1527 ValueType* type = as_ValueType(field_type); 1528 // call will_link again to determine if the field is valid. 1529 const bool needs_patching = !holder->is_loaded() || 1530 !field->will_link(method()->holder(), code) || 1531 PatchALot; 1532 1533 ValueStack* state_before = NULL; 1534 if (!holder->is_initialized() || needs_patching) { 1535 // save state before instruction for debug info when 1536 // deoptimization happens during patching 1537 state_before = copy_state_before(); 1538 } 1539 1540 Value obj = NULL; 1541 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) { 1542 if (state_before != NULL) { 1543 // build a patching constant 1544 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before); 1545 } else { 1546 obj = new Constant(new InstanceConstant(holder->java_mirror())); 1547 } 1548 } 1549 1550 if (field->is_final() && (code == Bytecodes::_putfield)) { 1551 scope()->set_wrote_final(); 1552 } 1553 1554 if (code == Bytecodes::_putfield) { 1555 scope()->set_wrote_fields(); 1556 } 1557 1558 const int offset = !needs_patching ? field->offset() : -1; 1559 switch (code) { 1560 case Bytecodes::_getstatic: { 1561 // check for compile-time constants, i.e., initialized static final fields 1562 Instruction* constant = NULL; 1563 if (field->is_constant() && !PatchALot) { 1564 ciConstant field_val = field->constant_value(); 1565 BasicType field_type = field_val.basic_type(); 1566 switch (field_type) { 1567 case T_ARRAY: 1568 case T_OBJECT: 1569 if (field_val.as_object()->should_be_constant()) { 1570 constant = new Constant(as_ValueType(field_val)); 1571 } 1572 break; 1573 1574 default: 1575 constant = new Constant(as_ValueType(field_val)); 1576 } 1577 } 1578 if (constant != NULL) { 1579 push(type, append(constant)); 1580 } else { 1581 if (state_before == NULL) { 1582 state_before = copy_state_for_exception(); 1583 } 1584 push(type, append(new LoadField(append(obj), offset, field, true, 1585 state_before, needs_patching))); 1586 } 1587 break; 1588 } 1589 case Bytecodes::_putstatic: 1590 { Value val = pop(type); 1591 if (state_before == NULL) { 1592 state_before = copy_state_for_exception(); 1593 } 1594 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching)); 1595 } 1596 break; 1597 case Bytecodes::_getfield: { 1598 // Check for compile-time constants, i.e., trusted final non-static fields. 1599 Instruction* constant = NULL; 1600 obj = apop(); 1601 ObjectType* obj_type = obj->type()->as_ObjectType(); 1602 if (obj_type->is_constant() && !PatchALot) { 1603 ciObject* const_oop = obj_type->constant_value(); 1604 if (!const_oop->is_null_object() && const_oop->is_loaded()) { 1605 if (field->is_constant()) { 1606 ciConstant field_val = field->constant_value_of(const_oop); 1607 BasicType field_type = field_val.basic_type(); 1608 switch (field_type) { 1609 case T_ARRAY: 1610 case T_OBJECT: 1611 if (field_val.as_object()->should_be_constant()) { 1612 constant = new Constant(as_ValueType(field_val)); 1613 } 1614 break; 1615 default: 1616 constant = new Constant(as_ValueType(field_val)); 1617 } 1618 } else { 1619 // For CallSite objects treat the target field as a compile time constant. 1620 if (const_oop->is_call_site()) { 1621 ciCallSite* call_site = const_oop->as_call_site(); 1622 if (field->is_call_site_target()) { 1623 ciMethodHandle* target = call_site->get_target(); 1624 if (target != NULL) { // just in case 1625 ciConstant field_val(T_OBJECT, target); 1626 constant = new Constant(as_ValueType(field_val)); 1627 // Add a dependence for invalidation of the optimization. 1628 if (!call_site->is_constant_call_site()) { 1629 dependency_recorder()->assert_call_site_target_value(call_site, target); 1630 } 1631 } 1632 } 1633 } 1634 } 1635 } 1636 } 1637 if (constant != NULL) { 1638 push(type, append(constant)); 1639 } else { 1640 if (state_before == NULL) { 1641 state_before = copy_state_for_exception(); 1642 } 1643 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching); 1644 Value replacement = !needs_patching ? _memory->load(load) : load; 1645 if (replacement != load) { 1646 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked"); 1647 push(type, replacement); 1648 } else { 1649 push(type, append(load)); 1650 } 1651 } 1652 break; 1653 } 1654 case Bytecodes::_putfield: { 1655 Value val = pop(type); 1656 obj = apop(); 1657 if (state_before == NULL) { 1658 state_before = copy_state_for_exception(); 1659 } 1660 StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching); 1661 if (!needs_patching) store = _memory->store(store); 1662 if (store != NULL) { 1663 append(store); 1664 } 1665 break; 1666 } 1667 default: 1668 ShouldNotReachHere(); 1669 break; 1670 } 1671} 1672 1673 1674Dependencies* GraphBuilder::dependency_recorder() const { 1675 assert(DeoptC1, "need debug information"); 1676 return compilation()->dependency_recorder(); 1677} 1678 1679// How many arguments do we want to profile? 1680Values* GraphBuilder::args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver) { 1681 int n = 0; 1682 bool has_receiver = may_have_receiver && Bytecodes::has_receiver(method()->java_code_at_bci(bci())); 1683 start = has_receiver ? 1 : 0; 1684 if (profile_arguments()) { 1685 ciProfileData* data = method()->method_data()->bci_to_data(bci()); 1686 if (data->is_CallTypeData() || data->is_VirtualCallTypeData()) { 1687 n = data->is_CallTypeData() ? data->as_CallTypeData()->number_of_arguments() : data->as_VirtualCallTypeData()->number_of_arguments(); 1688 } 1689 } 1690 // If we are inlining then we need to collect arguments to profile parameters for the target 1691 if (profile_parameters() && target != NULL) { 1692 if (target->method_data() != NULL && target->method_data()->parameters_type_data() != NULL) { 1693 // The receiver is profiled on method entry so it's included in 1694 // the number of parameters but here we're only interested in 1695 // actual arguments. 1696 n = MAX2(n, target->method_data()->parameters_type_data()->number_of_parameters() - start); 1697 } 1698 } 1699 if (n > 0) { 1700 return new Values(n); 1701 } 1702 return NULL; 1703} 1704 1705void GraphBuilder::check_args_for_profiling(Values* obj_args, int expected) { 1706#ifdef ASSERT 1707 bool ignored_will_link; 1708 ciSignature* declared_signature = NULL; 1709 ciMethod* real_target = method()->get_method_at_bci(bci(), ignored_will_link, &declared_signature); 1710 assert(expected == obj_args->length() || real_target->is_method_handle_intrinsic(), "missed on arg?"); 1711#endif 1712} 1713 1714// Collect arguments that we want to profile in a list 1715Values* GraphBuilder::collect_args_for_profiling(Values* args, ciMethod* target, bool may_have_receiver) { 1716 int start = 0; 1717 Values* obj_args = args_list_for_profiling(target, start, may_have_receiver); 1718 if (obj_args == NULL) { 1719 return NULL; 1720 } 1721 int s = obj_args->size(); 1722 // if called through method handle invoke, some arguments may have been popped 1723 for (int i = start, j = 0; j < s && i < args->length(); i++) { 1724 if (args->at(i)->type()->is_object_kind()) { 1725 obj_args->push(args->at(i)); 1726 j++; 1727 } 1728 } 1729 check_args_for_profiling(obj_args, s); 1730 return obj_args; 1731} 1732 1733 1734void GraphBuilder::invoke(Bytecodes::Code code) { 1735 bool will_link; 1736 ciSignature* declared_signature = NULL; 1737 ciMethod* target = stream()->get_method(will_link, &declared_signature); 1738 ciKlass* holder = stream()->get_declared_method_holder(); 1739 const Bytecodes::Code bc_raw = stream()->cur_bc_raw(); 1740 assert(declared_signature != NULL, "cannot be null"); 1741 1742 if (!C1PatchInvokeDynamic && Bytecodes::has_optional_appendix(bc_raw) && !will_link) { 1743 BAILOUT("unlinked call site (C1PatchInvokeDynamic is off)"); 1744 } 1745 1746 // we have to make sure the argument size (incl. the receiver) 1747 // is correct for compilation (the call would fail later during 1748 // linkage anyway) - was bug (gri 7/28/99) 1749 { 1750 // Use raw to get rewritten bytecode. 1751 const bool is_invokestatic = bc_raw == Bytecodes::_invokestatic; 1752 const bool allow_static = 1753 is_invokestatic || 1754 bc_raw == Bytecodes::_invokehandle || 1755 bc_raw == Bytecodes::_invokedynamic; 1756 if (target->is_loaded()) { 1757 if (( target->is_static() && !allow_static) || 1758 (!target->is_static() && is_invokestatic)) { 1759 BAILOUT("will cause link error"); 1760 } 1761 } 1762 } 1763 ciInstanceKlass* klass = target->holder(); 1764 1765 // check if CHA possible: if so, change the code to invoke_special 1766 ciInstanceKlass* calling_klass = method()->holder(); 1767 ciInstanceKlass* callee_holder = ciEnv::get_instance_klass_for_declared_method_holder(holder); 1768 ciInstanceKlass* actual_recv = callee_holder; 1769 1770 CompileLog* log = compilation()->log(); 1771 if (log != NULL) 1772 log->elem("call method='%d' instr='%s'", 1773 log->identify(target), 1774 Bytecodes::name(code)); 1775 1776 // Some methods are obviously bindable without any type checks so 1777 // convert them directly to an invokespecial or invokestatic. 1778 if (target->is_loaded() && !target->is_abstract() && target->can_be_statically_bound()) { 1779 switch (bc_raw) { 1780 case Bytecodes::_invokevirtual: 1781 code = Bytecodes::_invokespecial; 1782 break; 1783 case Bytecodes::_invokehandle: 1784 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial; 1785 break; 1786 } 1787 } else { 1788 if (bc_raw == Bytecodes::_invokehandle) { 1789 assert(!will_link, "should come here only for unlinked call"); 1790 code = Bytecodes::_invokespecial; 1791 } 1792 } 1793 1794 // Push appendix argument (MethodType, CallSite, etc.), if one. 1795 bool patch_for_appendix = false; 1796 int patching_appendix_arg = 0; 1797 if (C1PatchInvokeDynamic && 1798 (Bytecodes::has_optional_appendix(bc_raw) && (!will_link || PatchALot))) { 1799 Value arg = append(new Constant(new ObjectConstant(compilation()->env()->unloaded_ciinstance()), copy_state_before())); 1800 apush(arg); 1801 patch_for_appendix = true; 1802 patching_appendix_arg = (will_link && stream()->has_appendix()) ? 0 : 1; 1803 } else if (stream()->has_appendix()) { 1804 ciObject* appendix = stream()->get_appendix(); 1805 Value arg = append(new Constant(new ObjectConstant(appendix))); 1806 apush(arg); 1807 } 1808 1809 // NEEDS_CLEANUP 1810 // I've added the target->is_loaded() test below but I don't really understand 1811 // how klass->is_loaded() can be true and yet target->is_loaded() is false. 1812 // this happened while running the JCK invokevirtual tests under doit. TKR 1813 ciMethod* cha_monomorphic_target = NULL; 1814 ciMethod* exact_target = NULL; 1815 Value better_receiver = NULL; 1816 if (UseCHA && DeoptC1 && klass->is_loaded() && target->is_loaded() && 1817 !(// %%% FIXME: Are both of these relevant? 1818 target->is_method_handle_intrinsic() || 1819 target->is_compiled_lambda_form()) && 1820 !patch_for_appendix) { 1821 Value receiver = NULL; 1822 ciInstanceKlass* receiver_klass = NULL; 1823 bool type_is_exact = false; 1824 // try to find a precise receiver type 1825 if (will_link && !target->is_static()) { 1826 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1); 1827 receiver = state()->stack_at(index); 1828 ciType* type = receiver->exact_type(); 1829 if (type != NULL && type->is_loaded() && 1830 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) { 1831 receiver_klass = (ciInstanceKlass*) type; 1832 type_is_exact = true; 1833 } 1834 if (type == NULL) { 1835 type = receiver->declared_type(); 1836 if (type != NULL && type->is_loaded() && 1837 type->is_instance_klass() && !type->as_instance_klass()->is_interface()) { 1838 receiver_klass = (ciInstanceKlass*) type; 1839 if (receiver_klass->is_leaf_type() && !receiver_klass->is_final()) { 1840 // Insert a dependency on this type since 1841 // find_monomorphic_target may assume it's already done. 1842 dependency_recorder()->assert_leaf_type(receiver_klass); 1843 type_is_exact = true; 1844 } 1845 } 1846 } 1847 } 1848 if (receiver_klass != NULL && type_is_exact && 1849 receiver_klass->is_loaded() && code != Bytecodes::_invokespecial) { 1850 // If we have the exact receiver type we can bind directly to 1851 // the method to call. 1852 exact_target = target->resolve_invoke(calling_klass, receiver_klass); 1853 if (exact_target != NULL) { 1854 target = exact_target; 1855 code = Bytecodes::_invokespecial; 1856 } 1857 } 1858 if (receiver_klass != NULL && 1859 receiver_klass->is_subtype_of(actual_recv) && 1860 actual_recv->is_initialized()) { 1861 actual_recv = receiver_klass; 1862 } 1863 1864 if ((code == Bytecodes::_invokevirtual && callee_holder->is_initialized()) || 1865 (code == Bytecodes::_invokeinterface && callee_holder->is_initialized() && !actual_recv->is_interface())) { 1866 // Use CHA on the receiver to select a more precise method. 1867 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, callee_holder, actual_recv); 1868 } else if (code == Bytecodes::_invokeinterface && callee_holder->is_loaded() && receiver != NULL) { 1869 // if there is only one implementor of this interface then we 1870 // may be able bind this invoke directly to the implementing 1871 // klass but we need both a dependence on the single interface 1872 // and on the method we bind to. Additionally since all we know 1873 // about the receiver type is the it's supposed to implement the 1874 // interface we have to insert a check that it's the class we 1875 // expect. Interface types are not checked by the verifier so 1876 // they are roughly equivalent to Object. 1877 ciInstanceKlass* singleton = NULL; 1878 if (target->holder()->nof_implementors() == 1) { 1879 singleton = target->holder()->implementor(); 1880 assert(singleton != NULL && singleton != target->holder(), 1881 "just checking"); 1882 1883 assert(holder->is_interface(), "invokeinterface to non interface?"); 1884 ciInstanceKlass* decl_interface = (ciInstanceKlass*)holder; 1885 // the number of implementors for decl_interface is less or 1886 // equal to the number of implementors for target->holder() so 1887 // if number of implementors of target->holder() == 1 then 1888 // number of implementors for decl_interface is 0 or 1. If 1889 // it's 0 then no class implements decl_interface and there's 1890 // no point in inlining. 1891 if (!holder->is_loaded() || decl_interface->nof_implementors() != 1 || decl_interface->has_default_methods()) { 1892 singleton = NULL; 1893 } 1894 } 1895 if (singleton) { 1896 cha_monomorphic_target = target->find_monomorphic_target(calling_klass, target->holder(), singleton); 1897 if (cha_monomorphic_target != NULL) { 1898 // If CHA is able to bind this invoke then update the class 1899 // to match that class, otherwise klass will refer to the 1900 // interface. 1901 klass = cha_monomorphic_target->holder(); 1902 actual_recv = target->holder(); 1903 1904 // insert a check it's really the expected class. 1905 CheckCast* c = new CheckCast(klass, receiver, copy_state_for_exception()); 1906 c->set_incompatible_class_change_check(); 1907 c->set_direct_compare(klass->is_final()); 1908 // pass the result of the checkcast so that the compiler has 1909 // more accurate type info in the inlinee 1910 better_receiver = append_split(c); 1911 } 1912 } 1913 } 1914 } 1915 1916 if (cha_monomorphic_target != NULL) { 1917 if (cha_monomorphic_target->is_abstract()) { 1918 // Do not optimize for abstract methods 1919 cha_monomorphic_target = NULL; 1920 } 1921 } 1922 1923 if (cha_monomorphic_target != NULL) { 1924 if (!(target->is_final_method())) { 1925 // If we inlined because CHA revealed only a single target method, 1926 // then we are dependent on that target method not getting overridden 1927 // by dynamic class loading. Be sure to test the "static" receiver 1928 // dest_method here, as opposed to the actual receiver, which may 1929 // falsely lead us to believe that the receiver is final or private. 1930 dependency_recorder()->assert_unique_concrete_method(actual_recv, cha_monomorphic_target); 1931 } 1932 code = Bytecodes::_invokespecial; 1933 } 1934 1935 // check if we could do inlining 1936 if (!PatchALot && Inline && klass->is_loaded() && 1937 (klass->is_initialized() || klass->is_interface() && target->holder()->is_initialized()) 1938 && target->is_loaded() 1939 && !patch_for_appendix) { 1940 // callee is known => check if we have static binding 1941 assert(target->is_loaded(), "callee must be known"); 1942 if (code == Bytecodes::_invokestatic || 1943 code == Bytecodes::_invokespecial || 1944 code == Bytecodes::_invokevirtual && target->is_final_method() || 1945 code == Bytecodes::_invokedynamic) { 1946 ciMethod* inline_target = (cha_monomorphic_target != NULL) ? cha_monomorphic_target : target; 1947 // static binding => check if callee is ok 1948 bool success = try_inline(inline_target, (cha_monomorphic_target != NULL) || (exact_target != NULL), code, better_receiver); 1949 1950 CHECK_BAILOUT(); 1951 clear_inline_bailout(); 1952 1953 if (success) { 1954 // Register dependence if JVMTI has either breakpoint 1955 // setting or hotswapping of methods capabilities since they may 1956 // cause deoptimization. 1957 if (compilation()->env()->jvmti_can_hotswap_or_post_breakpoint()) { 1958 dependency_recorder()->assert_evol_method(inline_target); 1959 } 1960 return; 1961 } 1962 } else { 1963 print_inlining(target, "no static binding", /*success*/ false); 1964 } 1965 } else { 1966 print_inlining(target, "not inlineable", /*success*/ false); 1967 } 1968 1969 // If we attempted an inline which did not succeed because of a 1970 // bailout during construction of the callee graph, the entire 1971 // compilation has to be aborted. This is fairly rare and currently 1972 // seems to only occur for jasm-generated classes which contain 1973 // jsr/ret pairs which are not associated with finally clauses and 1974 // do not have exception handlers in the containing method, and are 1975 // therefore not caught early enough to abort the inlining without 1976 // corrupting the graph. (We currently bail out with a non-empty 1977 // stack at a ret in these situations.) 1978 CHECK_BAILOUT(); 1979 1980 // inlining not successful => standard invoke 1981 bool is_loaded = target->is_loaded(); 1982 ValueType* result_type = as_ValueType(declared_signature->return_type()); 1983 ValueStack* state_before = copy_state_exhandling(); 1984 1985 // The bytecode (code) might change in this method so we are checking this very late. 1986 const bool has_receiver = 1987 code == Bytecodes::_invokespecial || 1988 code == Bytecodes::_invokevirtual || 1989 code == Bytecodes::_invokeinterface; 1990 Values* args = state()->pop_arguments(target->arg_size_no_receiver() + patching_appendix_arg); 1991 Value recv = has_receiver ? apop() : NULL; 1992 int vtable_index = Method::invalid_vtable_index; 1993 1994#ifdef SPARC 1995 // Currently only supported on Sparc. 1996 // The UseInlineCaches only controls dispatch to invokevirtuals for 1997 // loaded classes which we weren't able to statically bind. 1998 if (!UseInlineCaches && is_loaded && code == Bytecodes::_invokevirtual 1999 && !target->can_be_statically_bound()) { 2000 // Find a vtable index if one is available 2001 vtable_index = target->resolve_vtable_index(calling_klass, callee_holder); 2002 } 2003#endif 2004 2005 if (recv != NULL && 2006 (code == Bytecodes::_invokespecial || 2007 !is_loaded || target->is_final())) { 2008 // invokespecial always needs a NULL check. invokevirtual where 2009 // the target is final or where it's not known that whether the 2010 // target is final requires a NULL check. Otherwise normal 2011 // invokevirtual will perform the null check during the lookup 2012 // logic or the unverified entry point. Profiling of calls 2013 // requires that the null check is performed in all cases. 2014 null_check(recv); 2015 } 2016 2017 if (is_profiling()) { 2018 if (recv != NULL && profile_calls()) { 2019 null_check(recv); 2020 } 2021 // Note that we'd collect profile data in this method if we wanted it. 2022 compilation()->set_would_profile(true); 2023 2024 if (profile_calls()) { 2025 assert(cha_monomorphic_target == NULL || exact_target == NULL, "both can not be set"); 2026 ciKlass* target_klass = NULL; 2027 if (cha_monomorphic_target != NULL) { 2028 target_klass = cha_monomorphic_target->holder(); 2029 } else if (exact_target != NULL) { 2030 target_klass = exact_target->holder(); 2031 } 2032 profile_call(target, recv, target_klass, collect_args_for_profiling(args, NULL, false), false); 2033 } 2034 } 2035 2036 Invoke* result = new Invoke(code, result_type, recv, args, vtable_index, target, state_before); 2037 // push result 2038 append_split(result); 2039 2040 if (result_type != voidType) { 2041 if (method()->is_strict()) { 2042 push(result_type, round_fp(result)); 2043 } else { 2044 push(result_type, result); 2045 } 2046 } 2047 if (profile_return() && result_type->is_object_kind()) { 2048 profile_return_type(result, target); 2049 } 2050} 2051 2052 2053void GraphBuilder::new_instance(int klass_index) { 2054 ValueStack* state_before = copy_state_exhandling(); 2055 bool will_link; 2056 ciKlass* klass = stream()->get_klass(will_link); 2057 assert(klass->is_instance_klass(), "must be an instance klass"); 2058 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before, stream()->is_unresolved_klass()); 2059 _memory->new_instance(new_instance); 2060 apush(append_split(new_instance)); 2061} 2062 2063 2064void GraphBuilder::new_type_array() { 2065 ValueStack* state_before = copy_state_exhandling(); 2066 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before))); 2067} 2068 2069 2070void GraphBuilder::new_object_array() { 2071 bool will_link; 2072 ciKlass* klass = stream()->get_klass(will_link); 2073 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 2074 NewArray* n = new NewObjectArray(klass, ipop(), state_before); 2075 apush(append_split(n)); 2076} 2077 2078 2079bool GraphBuilder::direct_compare(ciKlass* k) { 2080 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) { 2081 ciInstanceKlass* ik = k->as_instance_klass(); 2082 if (ik->is_final()) { 2083 return true; 2084 } else { 2085 if (DeoptC1 && UseCHA && !(ik->has_subklass() || ik->is_interface())) { 2086 // test class is leaf class 2087 dependency_recorder()->assert_leaf_type(ik); 2088 return true; 2089 } 2090 } 2091 } 2092 return false; 2093} 2094 2095 2096void GraphBuilder::check_cast(int klass_index) { 2097 bool will_link; 2098 ciKlass* klass = stream()->get_klass(will_link); 2099 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_for_exception(); 2100 CheckCast* c = new CheckCast(klass, apop(), state_before); 2101 apush(append_split(c)); 2102 c->set_direct_compare(direct_compare(klass)); 2103 2104 if (is_profiling()) { 2105 // Note that we'd collect profile data in this method if we wanted it. 2106 compilation()->set_would_profile(true); 2107 2108 if (profile_checkcasts()) { 2109 c->set_profiled_method(method()); 2110 c->set_profiled_bci(bci()); 2111 c->set_should_profile(true); 2112 } 2113 } 2114} 2115 2116 2117void GraphBuilder::instance_of(int klass_index) { 2118 bool will_link; 2119 ciKlass* klass = stream()->get_klass(will_link); 2120 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 2121 InstanceOf* i = new InstanceOf(klass, apop(), state_before); 2122 ipush(append_split(i)); 2123 i->set_direct_compare(direct_compare(klass)); 2124 2125 if (is_profiling()) { 2126 // Note that we'd collect profile data in this method if we wanted it. 2127 compilation()->set_would_profile(true); 2128 2129 if (profile_checkcasts()) { 2130 i->set_profiled_method(method()); 2131 i->set_profiled_bci(bci()); 2132 i->set_should_profile(true); 2133 } 2134 } 2135} 2136 2137 2138void GraphBuilder::monitorenter(Value x, int bci) { 2139 // save state before locking in case of deoptimization after a NullPointerException 2140 ValueStack* state_before = copy_state_for_exception_with_bci(bci); 2141 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before), bci); 2142 kill_all(); 2143} 2144 2145 2146void GraphBuilder::monitorexit(Value x, int bci) { 2147 append_with_bci(new MonitorExit(x, state()->unlock()), bci); 2148 kill_all(); 2149} 2150 2151 2152void GraphBuilder::new_multi_array(int dimensions) { 2153 bool will_link; 2154 ciKlass* klass = stream()->get_klass(will_link); 2155 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling(); 2156 2157 Values* dims = new Values(dimensions, NULL); 2158 // fill in all dimensions 2159 int i = dimensions; 2160 while (i-- > 0) dims->at_put(i, ipop()); 2161 // create array 2162 NewArray* n = new NewMultiArray(klass, dims, state_before); 2163 apush(append_split(n)); 2164} 2165 2166 2167void GraphBuilder::throw_op(int bci) { 2168 // We require that the debug info for a Throw be the "state before" 2169 // the Throw (i.e., exception oop is still on TOS) 2170 ValueStack* state_before = copy_state_before_with_bci(bci); 2171 Throw* t = new Throw(apop(), state_before); 2172 // operand stack not needed after a throw 2173 state()->truncate_stack(0); 2174 append_with_bci(t, bci); 2175} 2176 2177 2178Value GraphBuilder::round_fp(Value fp_value) { 2179 // no rounding needed if SSE2 is used 2180 if (RoundFPResults && UseSSE < 2) { 2181 // Must currently insert rounding node for doubleword values that 2182 // are results of expressions (i.e., not loads from memory or 2183 // constants) 2184 if (fp_value->type()->tag() == doubleTag && 2185 fp_value->as_Constant() == NULL && 2186 fp_value->as_Local() == NULL && // method parameters need no rounding 2187 fp_value->as_RoundFP() == NULL) { 2188 return append(new RoundFP(fp_value)); 2189 } 2190 } 2191 return fp_value; 2192} 2193 2194 2195Instruction* GraphBuilder::append_with_bci(Instruction* instr, int bci) { 2196 Canonicalizer canon(compilation(), instr, bci); 2197 Instruction* i1 = canon.canonical(); 2198 if (i1->is_linked() || !i1->can_be_linked()) { 2199 // Canonicalizer returned an instruction which was already 2200 // appended so simply return it. 2201 return i1; 2202 } 2203 2204 if (UseLocalValueNumbering) { 2205 // Lookup the instruction in the ValueMap and add it to the map if 2206 // it's not found. 2207 Instruction* i2 = vmap()->find_insert(i1); 2208 if (i2 != i1) { 2209 // found an entry in the value map, so just return it. 2210 assert(i2->is_linked(), "should already be linked"); 2211 return i2; 2212 } 2213 ValueNumberingEffects vne(vmap()); 2214 i1->visit(&vne); 2215 } 2216 2217 // i1 was not eliminated => append it 2218 assert(i1->next() == NULL, "shouldn't already be linked"); 2219 _last = _last->set_next(i1, canon.bci()); 2220 2221 if (++_instruction_count >= InstructionCountCutoff && !bailed_out()) { 2222 // set the bailout state but complete normal processing. We 2223 // might do a little more work before noticing the bailout so we 2224 // want processing to continue normally until it's noticed. 2225 bailout("Method and/or inlining is too large"); 2226 } 2227 2228#ifndef PRODUCT 2229 if (PrintIRDuringConstruction) { 2230 InstructionPrinter ip; 2231 ip.print_line(i1); 2232 if (Verbose) { 2233 state()->print(); 2234 } 2235 } 2236#endif 2237 2238 // save state after modification of operand stack for StateSplit instructions 2239 StateSplit* s = i1->as_StateSplit(); 2240 if (s != NULL) { 2241 if (EliminateFieldAccess) { 2242 Intrinsic* intrinsic = s->as_Intrinsic(); 2243 if (s->as_Invoke() != NULL || (intrinsic && !intrinsic->preserves_state())) { 2244 _memory->kill(); 2245 } 2246 } 2247 s->set_state(state()->copy(ValueStack::StateAfter, canon.bci())); 2248 } 2249 2250 // set up exception handlers for this instruction if necessary 2251 if (i1->can_trap()) { 2252 i1->set_exception_handlers(handle_exception(i1)); 2253 assert(i1->exception_state() != NULL || !i1->needs_exception_state() || bailed_out(), "handle_exception must set exception state"); 2254 } 2255 return i1; 2256} 2257 2258 2259Instruction* GraphBuilder::append(Instruction* instr) { 2260 assert(instr->as_StateSplit() == NULL || instr->as_BlockEnd() != NULL, "wrong append used"); 2261 return append_with_bci(instr, bci()); 2262} 2263 2264 2265Instruction* GraphBuilder::append_split(StateSplit* instr) { 2266 return append_with_bci(instr, bci()); 2267} 2268 2269 2270void GraphBuilder::null_check(Value value) { 2271 if (value->as_NewArray() != NULL || value->as_NewInstance() != NULL) { 2272 return; 2273 } else { 2274 Constant* con = value->as_Constant(); 2275 if (con) { 2276 ObjectType* c = con->type()->as_ObjectType(); 2277 if (c && c->is_loaded()) { 2278 ObjectConstant* oc = c->as_ObjectConstant(); 2279 if (!oc || !oc->value()->is_null_object()) { 2280 return; 2281 } 2282 } 2283 } 2284 } 2285 append(new NullCheck(value, copy_state_for_exception())); 2286} 2287 2288 2289 2290XHandlers* GraphBuilder::handle_exception(Instruction* instruction) { 2291 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != NULL)) { 2292 assert(instruction->exception_state() == NULL 2293 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState 2294 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->should_retain_local_variables()), 2295 "exception_state should be of exception kind"); 2296 return new XHandlers(); 2297 } 2298 2299 XHandlers* exception_handlers = new XHandlers(); 2300 ScopeData* cur_scope_data = scope_data(); 2301 ValueStack* cur_state = instruction->state_before(); 2302 ValueStack* prev_state = NULL; 2303 int scope_count = 0; 2304 2305 assert(cur_state != NULL, "state_before must be set"); 2306 do { 2307 int cur_bci = cur_state->bci(); 2308 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match"); 2309 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci(), "invalid bci"); 2310 2311 // join with all potential exception handlers 2312 XHandlers* list = cur_scope_data->xhandlers(); 2313 const int n = list->length(); 2314 for (int i = 0; i < n; i++) { 2315 XHandler* h = list->handler_at(i); 2316 if (h->covers(cur_bci)) { 2317 // h is a potential exception handler => join it 2318 compilation()->set_has_exception_handlers(true); 2319 2320 BlockBegin* entry = h->entry_block(); 2321 if (entry == block()) { 2322 // It's acceptable for an exception handler to cover itself 2323 // but we don't handle that in the parser currently. It's 2324 // very rare so we bailout instead of trying to handle it. 2325 BAILOUT_("exception handler covers itself", exception_handlers); 2326 } 2327 assert(entry->bci() == h->handler_bci(), "must match"); 2328 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond"); 2329 2330 // previously this was a BAILOUT, but this is not necessary 2331 // now because asynchronous exceptions are not handled this way. 2332 assert(entry->state() == NULL || cur_state->total_locks_size() == entry->state()->total_locks_size(), "locks do not match"); 2333 2334 // xhandler start with an empty expression stack 2335 if (cur_state->stack_size() != 0) { 2336 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci()); 2337 } 2338 if (instruction->exception_state() == NULL) { 2339 instruction->set_exception_state(cur_state); 2340 } 2341 2342 // Note: Usually this join must work. However, very 2343 // complicated jsr-ret structures where we don't ret from 2344 // the subroutine can cause the objects on the monitor 2345 // stacks to not match because blocks can be parsed twice. 2346 // The only test case we've seen so far which exhibits this 2347 // problem is caught by the infinite recursion test in 2348 // GraphBuilder::jsr() if the join doesn't work. 2349 if (!entry->try_merge(cur_state)) { 2350 BAILOUT_("error while joining with exception handler, prob. due to complicated jsr/rets", exception_handlers); 2351 } 2352 2353 // add current state for correct handling of phi functions at begin of xhandler 2354 int phi_operand = entry->add_exception_state(cur_state); 2355 2356 // add entry to the list of xhandlers of this block 2357 _block->add_exception_handler(entry); 2358 2359 // add back-edge from xhandler entry to this block 2360 if (!entry->is_predecessor(_block)) { 2361 entry->add_predecessor(_block); 2362 } 2363 2364 // clone XHandler because phi_operand and scope_count can not be shared 2365 XHandler* new_xhandler = new XHandler(h); 2366 new_xhandler->set_phi_operand(phi_operand); 2367 new_xhandler->set_scope_count(scope_count); 2368 exception_handlers->append(new_xhandler); 2369 2370 // fill in exception handler subgraph lazily 2371 assert(!entry->is_set(BlockBegin::was_visited_flag), "entry must not be visited yet"); 2372 cur_scope_data->add_to_work_list(entry); 2373 2374 // stop when reaching catchall 2375 if (h->catch_type() == 0) { 2376 return exception_handlers; 2377 } 2378 } 2379 } 2380 2381 if (exception_handlers->length() == 0) { 2382 // This scope and all callees do not handle exceptions, so the local 2383 // variables of this scope are not needed. However, the scope itself is 2384 // required for a correct exception stack trace -> clear out the locals. 2385 if (_compilation->env()->should_retain_local_variables()) { 2386 cur_state = cur_state->copy(ValueStack::ExceptionState, cur_state->bci()); 2387 } else { 2388 cur_state = cur_state->copy(ValueStack::EmptyExceptionState, cur_state->bci()); 2389 } 2390 if (prev_state != NULL) { 2391 prev_state->set_caller_state(cur_state); 2392 } 2393 if (instruction->exception_state() == NULL) { 2394 instruction->set_exception_state(cur_state); 2395 } 2396 } 2397 2398 // Set up iteration for next time. 2399 // If parsing a jsr, do not grab exception handlers from the 2400 // parent scopes for this method (already got them, and they 2401 // needed to be cloned) 2402 2403 while (cur_scope_data->parsing_jsr()) { 2404 cur_scope_data = cur_scope_data->parent(); 2405 } 2406 2407 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match"); 2408 assert(cur_state->locks_size() == 0 || cur_state->locks_size() == 1, "unlocking must be done in a catchall exception handler"); 2409 2410 prev_state = cur_state; 2411 cur_state = cur_state->caller_state(); 2412 cur_scope_data = cur_scope_data->parent(); 2413 scope_count++; 2414 } while (cur_scope_data != NULL); 2415 2416 return exception_handlers; 2417} 2418 2419 2420// Helper class for simplifying Phis. 2421class PhiSimplifier : public BlockClosure { 2422 private: 2423 bool _has_substitutions; 2424 Value simplify(Value v); 2425 2426 public: 2427 PhiSimplifier(BlockBegin* start) : _has_substitutions(false) { 2428 start->iterate_preorder(this); 2429 if (_has_substitutions) { 2430 SubstitutionResolver sr(start); 2431 } 2432 } 2433 void block_do(BlockBegin* b); 2434 bool has_substitutions() const { return _has_substitutions; } 2435}; 2436 2437 2438Value PhiSimplifier::simplify(Value v) { 2439 Phi* phi = v->as_Phi(); 2440 2441 if (phi == NULL) { 2442 // no phi function 2443 return v; 2444 } else if (v->has_subst()) { 2445 // already substituted; subst can be phi itself -> simplify 2446 return simplify(v->subst()); 2447 } else if (phi->is_set(Phi::cannot_simplify)) { 2448 // already tried to simplify phi before 2449 return phi; 2450 } else if (phi->is_set(Phi::visited)) { 2451 // break cycles in phi functions 2452 return phi; 2453 } else if (phi->type()->is_illegal()) { 2454 // illegal phi functions are ignored anyway 2455 return phi; 2456 2457 } else { 2458 // mark phi function as processed to break cycles in phi functions 2459 phi->set(Phi::visited); 2460 2461 // simplify x = [y, x] and x = [y, y] to y 2462 Value subst = NULL; 2463 int opd_count = phi->operand_count(); 2464 for (int i = 0; i < opd_count; i++) { 2465 Value opd = phi->operand_at(i); 2466 assert(opd != NULL, "Operand must exist!"); 2467 2468 if (opd->type()->is_illegal()) { 2469 // if one operand is illegal, the entire phi function is illegal 2470 phi->make_illegal(); 2471 phi->clear(Phi::visited); 2472 return phi; 2473 } 2474 2475 Value new_opd = simplify(opd); 2476 assert(new_opd != NULL, "Simplified operand must exist!"); 2477 2478 if (new_opd != phi && new_opd != subst) { 2479 if (subst == NULL) { 2480 subst = new_opd; 2481 } else { 2482 // no simplification possible 2483 phi->set(Phi::cannot_simplify); 2484 phi->clear(Phi::visited); 2485 return phi; 2486 } 2487 } 2488 } 2489 2490 // sucessfully simplified phi function 2491 assert(subst != NULL, "illegal phi function"); 2492 _has_substitutions = true; 2493 phi->clear(Phi::visited); 2494 phi->set_subst(subst); 2495 2496#ifndef PRODUCT 2497 if (PrintPhiFunctions) { 2498 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()); 2499 } 2500#endif 2501 2502 return subst; 2503 } 2504} 2505 2506 2507void PhiSimplifier::block_do(BlockBegin* b) { 2508 for_each_phi_fun(b, phi, 2509 simplify(phi); 2510 ); 2511 2512#ifdef ASSERT 2513 for_each_phi_fun(b, phi, 2514 assert(phi->operand_count() != 1 || phi->subst() != phi, "missed trivial simplification"); 2515 ); 2516 2517 ValueStack* state = b->state()->caller_state(); 2518 for_each_state_value(state, value, 2519 Phi* phi = value->as_Phi(); 2520 assert(phi == NULL || phi->block() != b, "must not have phi function to simplify in caller state"); 2521 ); 2522#endif 2523} 2524 2525// This method is called after all blocks are filled with HIR instructions 2526// It eliminates all Phi functions of the form x = [y, y] and x = [y, x] 2527void GraphBuilder::eliminate_redundant_phis(BlockBegin* start) { 2528 PhiSimplifier simplifier(start); 2529} 2530 2531 2532void GraphBuilder::connect_to_end(BlockBegin* beg) { 2533 // setup iteration 2534 kill_all(); 2535 _block = beg; 2536 _state = beg->state()->copy_for_parsing(); 2537 _last = beg; 2538 iterate_bytecodes_for_block(beg->bci()); 2539} 2540 2541 2542BlockEnd* GraphBuilder::iterate_bytecodes_for_block(int bci) { 2543#ifndef PRODUCT 2544 if (PrintIRDuringConstruction) { 2545 tty->cr(); 2546 InstructionPrinter ip; 2547 ip.print_instr(_block); tty->cr(); 2548 ip.print_stack(_block->state()); tty->cr(); 2549 ip.print_inline_level(_block); 2550 ip.print_head(); 2551 tty->print_cr("locals size: %d stack size: %d", state()->locals_size(), state()->stack_size()); 2552 } 2553#endif 2554 _skip_block = false; 2555 assert(state() != NULL, "ValueStack missing!"); 2556 CompileLog* log = compilation()->log(); 2557 ciBytecodeStream s(method()); 2558 s.reset_to_bci(bci); 2559 int prev_bci = bci; 2560 scope_data()->set_stream(&s); 2561 // iterate 2562 Bytecodes::Code code = Bytecodes::_illegal; 2563 bool push_exception = false; 2564 2565 if (block()->is_set(BlockBegin::exception_entry_flag) && block()->next() == NULL) { 2566 // first thing in the exception entry block should be the exception object. 2567 push_exception = true; 2568 } 2569 2570 while (!bailed_out() && last()->as_BlockEnd() == NULL && 2571 (code = stream()->next()) != ciBytecodeStream::EOBC() && 2572 (block_at(s.cur_bci()) == NULL || block_at(s.cur_bci()) == block())) { 2573 assert(state()->kind() == ValueStack::Parsing, "invalid state kind"); 2574 2575 if (log != NULL) 2576 log->set_context("bc code='%d' bci='%d'", (int)code, s.cur_bci()); 2577 2578 // Check for active jsr during OSR compilation 2579 if (compilation()->is_osr_compile() 2580 && scope()->is_top_scope() 2581 && parsing_jsr() 2582 && s.cur_bci() == compilation()->osr_bci()) { 2583 bailout("OSR not supported while a jsr is active"); 2584 } 2585 2586 if (push_exception) { 2587 apush(append(new ExceptionObject())); 2588 push_exception = false; 2589 } 2590 2591 // handle bytecode 2592 switch (code) { 2593 case Bytecodes::_nop : /* nothing to do */ break; 2594 case Bytecodes::_aconst_null : apush(append(new Constant(objectNull ))); break; 2595 case Bytecodes::_iconst_m1 : ipush(append(new Constant(new IntConstant (-1)))); break; 2596 case Bytecodes::_iconst_0 : ipush(append(new Constant(intZero ))); break; 2597 case Bytecodes::_iconst_1 : ipush(append(new Constant(intOne ))); break; 2598 case Bytecodes::_iconst_2 : ipush(append(new Constant(new IntConstant ( 2)))); break; 2599 case Bytecodes::_iconst_3 : ipush(append(new Constant(new IntConstant ( 3)))); break; 2600 case Bytecodes::_iconst_4 : ipush(append(new Constant(new IntConstant ( 4)))); break; 2601 case Bytecodes::_iconst_5 : ipush(append(new Constant(new IntConstant ( 5)))); break; 2602 case Bytecodes::_lconst_0 : lpush(append(new Constant(new LongConstant ( 0)))); break; 2603 case Bytecodes::_lconst_1 : lpush(append(new Constant(new LongConstant ( 1)))); break; 2604 case Bytecodes::_fconst_0 : fpush(append(new Constant(new FloatConstant ( 0)))); break; 2605 case Bytecodes::_fconst_1 : fpush(append(new Constant(new FloatConstant ( 1)))); break; 2606 case Bytecodes::_fconst_2 : fpush(append(new Constant(new FloatConstant ( 2)))); break; 2607 case Bytecodes::_dconst_0 : dpush(append(new Constant(new DoubleConstant( 0)))); break; 2608 case Bytecodes::_dconst_1 : dpush(append(new Constant(new DoubleConstant( 1)))); break; 2609 case Bytecodes::_bipush : ipush(append(new Constant(new IntConstant(((signed char*)s.cur_bcp())[1])))); break; 2610 case Bytecodes::_sipush : ipush(append(new Constant(new IntConstant((short)Bytes::get_Java_u2(s.cur_bcp()+1))))); break; 2611 case Bytecodes::_ldc : // fall through 2612 case Bytecodes::_ldc_w : // fall through 2613 case Bytecodes::_ldc2_w : load_constant(); break; 2614 case Bytecodes::_iload : load_local(intType , s.get_index()); break; 2615 case Bytecodes::_lload : load_local(longType , s.get_index()); break; 2616 case Bytecodes::_fload : load_local(floatType , s.get_index()); break; 2617 case Bytecodes::_dload : load_local(doubleType , s.get_index()); break; 2618 case Bytecodes::_aload : load_local(instanceType, s.get_index()); break; 2619 case Bytecodes::_iload_0 : load_local(intType , 0); break; 2620 case Bytecodes::_iload_1 : load_local(intType , 1); break; 2621 case Bytecodes::_iload_2 : load_local(intType , 2); break; 2622 case Bytecodes::_iload_3 : load_local(intType , 3); break; 2623 case Bytecodes::_lload_0 : load_local(longType , 0); break; 2624 case Bytecodes::_lload_1 : load_local(longType , 1); break; 2625 case Bytecodes::_lload_2 : load_local(longType , 2); break; 2626 case Bytecodes::_lload_3 : load_local(longType , 3); break; 2627 case Bytecodes::_fload_0 : load_local(floatType , 0); break; 2628 case Bytecodes::_fload_1 : load_local(floatType , 1); break; 2629 case Bytecodes::_fload_2 : load_local(floatType , 2); break; 2630 case Bytecodes::_fload_3 : load_local(floatType , 3); break; 2631 case Bytecodes::_dload_0 : load_local(doubleType, 0); break; 2632 case Bytecodes::_dload_1 : load_local(doubleType, 1); break; 2633 case Bytecodes::_dload_2 : load_local(doubleType, 2); break; 2634 case Bytecodes::_dload_3 : load_local(doubleType, 3); break; 2635 case Bytecodes::_aload_0 : load_local(objectType, 0); break; 2636 case Bytecodes::_aload_1 : load_local(objectType, 1); break; 2637 case Bytecodes::_aload_2 : load_local(objectType, 2); break; 2638 case Bytecodes::_aload_3 : load_local(objectType, 3); break; 2639 case Bytecodes::_iaload : load_indexed(T_INT ); break; 2640 case Bytecodes::_laload : load_indexed(T_LONG ); break; 2641 case Bytecodes::_faload : load_indexed(T_FLOAT ); break; 2642 case Bytecodes::_daload : load_indexed(T_DOUBLE); break; 2643 case Bytecodes::_aaload : load_indexed(T_OBJECT); break; 2644 case Bytecodes::_baload : load_indexed(T_BYTE ); break; 2645 case Bytecodes::_caload : load_indexed(T_CHAR ); break; 2646 case Bytecodes::_saload : load_indexed(T_SHORT ); break; 2647 case Bytecodes::_istore : store_local(intType , s.get_index()); break; 2648 case Bytecodes::_lstore : store_local(longType , s.get_index()); break; 2649 case Bytecodes::_fstore : store_local(floatType , s.get_index()); break; 2650 case Bytecodes::_dstore : store_local(doubleType, s.get_index()); break; 2651 case Bytecodes::_astore : store_local(objectType, s.get_index()); break; 2652 case Bytecodes::_istore_0 : store_local(intType , 0); break; 2653 case Bytecodes::_istore_1 : store_local(intType , 1); break; 2654 case Bytecodes::_istore_2 : store_local(intType , 2); break; 2655 case Bytecodes::_istore_3 : store_local(intType , 3); break; 2656 case Bytecodes::_lstore_0 : store_local(longType , 0); break; 2657 case Bytecodes::_lstore_1 : store_local(longType , 1); break; 2658 case Bytecodes::_lstore_2 : store_local(longType , 2); break; 2659 case Bytecodes::_lstore_3 : store_local(longType , 3); break; 2660 case Bytecodes::_fstore_0 : store_local(floatType , 0); break; 2661 case Bytecodes::_fstore_1 : store_local(floatType , 1); break; 2662 case Bytecodes::_fstore_2 : store_local(floatType , 2); break; 2663 case Bytecodes::_fstore_3 : store_local(floatType , 3); break; 2664 case Bytecodes::_dstore_0 : store_local(doubleType, 0); break; 2665 case Bytecodes::_dstore_1 : store_local(doubleType, 1); break; 2666 case Bytecodes::_dstore_2 : store_local(doubleType, 2); break; 2667 case Bytecodes::_dstore_3 : store_local(doubleType, 3); break; 2668 case Bytecodes::_astore_0 : store_local(objectType, 0); break; 2669 case Bytecodes::_astore_1 : store_local(objectType, 1); break; 2670 case Bytecodes::_astore_2 : store_local(objectType, 2); break; 2671 case Bytecodes::_astore_3 : store_local(objectType, 3); break; 2672 case Bytecodes::_iastore : store_indexed(T_INT ); break; 2673 case Bytecodes::_lastore : store_indexed(T_LONG ); break; 2674 case Bytecodes::_fastore : store_indexed(T_FLOAT ); break; 2675 case Bytecodes::_dastore : store_indexed(T_DOUBLE); break; 2676 case Bytecodes::_aastore : store_indexed(T_OBJECT); break; 2677 case Bytecodes::_bastore : store_indexed(T_BYTE ); break; 2678 case Bytecodes::_castore : store_indexed(T_CHAR ); break; 2679 case Bytecodes::_sastore : store_indexed(T_SHORT ); break; 2680 case Bytecodes::_pop : // fall through 2681 case Bytecodes::_pop2 : // fall through 2682 case Bytecodes::_dup : // fall through 2683 case Bytecodes::_dup_x1 : // fall through 2684 case Bytecodes::_dup_x2 : // fall through 2685 case Bytecodes::_dup2 : // fall through 2686 case Bytecodes::_dup2_x1 : // fall through 2687 case Bytecodes::_dup2_x2 : // fall through 2688 case Bytecodes::_swap : stack_op(code); break; 2689 case Bytecodes::_iadd : arithmetic_op(intType , code); break; 2690 case Bytecodes::_ladd : arithmetic_op(longType , code); break; 2691 case Bytecodes::_fadd : arithmetic_op(floatType , code); break; 2692 case Bytecodes::_dadd : arithmetic_op(doubleType, code); break; 2693 case Bytecodes::_isub : arithmetic_op(intType , code); break; 2694 case Bytecodes::_lsub : arithmetic_op(longType , code); break; 2695 case Bytecodes::_fsub : arithmetic_op(floatType , code); break; 2696 case Bytecodes::_dsub : arithmetic_op(doubleType, code); break; 2697 case Bytecodes::_imul : arithmetic_op(intType , code); break; 2698 case Bytecodes::_lmul : arithmetic_op(longType , code); break; 2699 case Bytecodes::_fmul : arithmetic_op(floatType , code); break; 2700 case Bytecodes::_dmul : arithmetic_op(doubleType, code); break; 2701 case Bytecodes::_idiv : arithmetic_op(intType , code, copy_state_for_exception()); break; 2702 case Bytecodes::_ldiv : arithmetic_op(longType , code, copy_state_for_exception()); break; 2703 case Bytecodes::_fdiv : arithmetic_op(floatType , code); break; 2704 case Bytecodes::_ddiv : arithmetic_op(doubleType, code); break; 2705 case Bytecodes::_irem : arithmetic_op(intType , code, copy_state_for_exception()); break; 2706 case Bytecodes::_lrem : arithmetic_op(longType , code, copy_state_for_exception()); break; 2707 case Bytecodes::_frem : arithmetic_op(floatType , code); break; 2708 case Bytecodes::_drem : arithmetic_op(doubleType, code); break; 2709 case Bytecodes::_ineg : negate_op(intType ); break; 2710 case Bytecodes::_lneg : negate_op(longType ); break; 2711 case Bytecodes::_fneg : negate_op(floatType ); break; 2712 case Bytecodes::_dneg : negate_op(doubleType); break; 2713 case Bytecodes::_ishl : shift_op(intType , code); break; 2714 case Bytecodes::_lshl : shift_op(longType, code); break; 2715 case Bytecodes::_ishr : shift_op(intType , code); break; 2716 case Bytecodes::_lshr : shift_op(longType, code); break; 2717 case Bytecodes::_iushr : shift_op(intType , code); break; 2718 case Bytecodes::_lushr : shift_op(longType, code); break; 2719 case Bytecodes::_iand : logic_op(intType , code); break; 2720 case Bytecodes::_land : logic_op(longType, code); break; 2721 case Bytecodes::_ior : logic_op(intType , code); break; 2722 case Bytecodes::_lor : logic_op(longType, code); break; 2723 case Bytecodes::_ixor : logic_op(intType , code); break; 2724 case Bytecodes::_lxor : logic_op(longType, code); break; 2725 case Bytecodes::_iinc : increment(); break; 2726 case Bytecodes::_i2l : convert(code, T_INT , T_LONG ); break; 2727 case Bytecodes::_i2f : convert(code, T_INT , T_FLOAT ); break; 2728 case Bytecodes::_i2d : convert(code, T_INT , T_DOUBLE); break; 2729 case Bytecodes::_l2i : convert(code, T_LONG , T_INT ); break; 2730 case Bytecodes::_l2f : convert(code, T_LONG , T_FLOAT ); break; 2731 case Bytecodes::_l2d : convert(code, T_LONG , T_DOUBLE); break; 2732 case Bytecodes::_f2i : convert(code, T_FLOAT , T_INT ); break; 2733 case Bytecodes::_f2l : convert(code, T_FLOAT , T_LONG ); break; 2734 case Bytecodes::_f2d : convert(code, T_FLOAT , T_DOUBLE); break; 2735 case Bytecodes::_d2i : convert(code, T_DOUBLE, T_INT ); break; 2736 case Bytecodes::_d2l : convert(code, T_DOUBLE, T_LONG ); break; 2737 case Bytecodes::_d2f : convert(code, T_DOUBLE, T_FLOAT ); break; 2738 case Bytecodes::_i2b : convert(code, T_INT , T_BYTE ); break; 2739 case Bytecodes::_i2c : convert(code, T_INT , T_CHAR ); break; 2740 case Bytecodes::_i2s : convert(code, T_INT , T_SHORT ); break; 2741 case Bytecodes::_lcmp : compare_op(longType , code); break; 2742 case Bytecodes::_fcmpl : compare_op(floatType , code); break; 2743 case Bytecodes::_fcmpg : compare_op(floatType , code); break; 2744 case Bytecodes::_dcmpl : compare_op(doubleType, code); break; 2745 case Bytecodes::_dcmpg : compare_op(doubleType, code); break; 2746 case Bytecodes::_ifeq : if_zero(intType , If::eql); break; 2747 case Bytecodes::_ifne : if_zero(intType , If::neq); break; 2748 case Bytecodes::_iflt : if_zero(intType , If::lss); break; 2749 case Bytecodes::_ifge : if_zero(intType , If::geq); break; 2750 case Bytecodes::_ifgt : if_zero(intType , If::gtr); break; 2751 case Bytecodes::_ifle : if_zero(intType , If::leq); break; 2752 case Bytecodes::_if_icmpeq : if_same(intType , If::eql); break; 2753 case Bytecodes::_if_icmpne : if_same(intType , If::neq); break; 2754 case Bytecodes::_if_icmplt : if_same(intType , If::lss); break; 2755 case Bytecodes::_if_icmpge : if_same(intType , If::geq); break; 2756 case Bytecodes::_if_icmpgt : if_same(intType , If::gtr); break; 2757 case Bytecodes::_if_icmple : if_same(intType , If::leq); break; 2758 case Bytecodes::_if_acmpeq : if_same(objectType, If::eql); break; 2759 case Bytecodes::_if_acmpne : if_same(objectType, If::neq); break; 2760 case Bytecodes::_goto : _goto(s.cur_bci(), s.get_dest()); break; 2761 case Bytecodes::_jsr : jsr(s.get_dest()); break; 2762 case Bytecodes::_ret : ret(s.get_index()); break; 2763 case Bytecodes::_tableswitch : table_switch(); break; 2764 case Bytecodes::_lookupswitch : lookup_switch(); break; 2765 case Bytecodes::_ireturn : method_return(ipop()); break; 2766 case Bytecodes::_lreturn : method_return(lpop()); break; 2767 case Bytecodes::_freturn : method_return(fpop()); break; 2768 case Bytecodes::_dreturn : method_return(dpop()); break; 2769 case Bytecodes::_areturn : method_return(apop()); break; 2770 case Bytecodes::_return : method_return(NULL ); break; 2771 case Bytecodes::_getstatic : // fall through 2772 case Bytecodes::_putstatic : // fall through 2773 case Bytecodes::_getfield : // fall through 2774 case Bytecodes::_putfield : access_field(code); break; 2775 case Bytecodes::_invokevirtual : // fall through 2776 case Bytecodes::_invokespecial : // fall through 2777 case Bytecodes::_invokestatic : // fall through 2778 case Bytecodes::_invokedynamic : // fall through 2779 case Bytecodes::_invokeinterface: invoke(code); break; 2780 case Bytecodes::_new : new_instance(s.get_index_u2()); break; 2781 case Bytecodes::_newarray : new_type_array(); break; 2782 case Bytecodes::_anewarray : new_object_array(); break; 2783 case Bytecodes::_arraylength : { ValueStack* state_before = copy_state_for_exception(); ipush(append(new ArrayLength(apop(), state_before))); break; } 2784 case Bytecodes::_athrow : throw_op(s.cur_bci()); break; 2785 case Bytecodes::_checkcast : check_cast(s.get_index_u2()); break; 2786 case Bytecodes::_instanceof : instance_of(s.get_index_u2()); break; 2787 case Bytecodes::_monitorenter : monitorenter(apop(), s.cur_bci()); break; 2788 case Bytecodes::_monitorexit : monitorexit (apop(), s.cur_bci()); break; 2789 case Bytecodes::_wide : ShouldNotReachHere(); break; 2790 case Bytecodes::_multianewarray : new_multi_array(s.cur_bcp()[3]); break; 2791 case Bytecodes::_ifnull : if_null(objectType, If::eql); break; 2792 case Bytecodes::_ifnonnull : if_null(objectType, If::neq); break; 2793 case Bytecodes::_goto_w : _goto(s.cur_bci(), s.get_far_dest()); break; 2794 case Bytecodes::_jsr_w : jsr(s.get_far_dest()); break; 2795 case Bytecodes::_breakpoint : BAILOUT_("concurrent setting of breakpoint", NULL); 2796 default : ShouldNotReachHere(); break; 2797 } 2798 2799 if (log != NULL) 2800 log->clear_context(); // skip marker if nothing was printed 2801 2802 // save current bci to setup Goto at the end 2803 prev_bci = s.cur_bci(); 2804 2805 } 2806 CHECK_BAILOUT_(NULL); 2807 // stop processing of this block (see try_inline_full) 2808 if (_skip_block) { 2809 _skip_block = false; 2810 assert(_last && _last->as_BlockEnd(), ""); 2811 return _last->as_BlockEnd(); 2812 } 2813 // if there are any, check if last instruction is a BlockEnd instruction 2814 BlockEnd* end = last()->as_BlockEnd(); 2815 if (end == NULL) { 2816 // all blocks must end with a BlockEnd instruction => add a Goto 2817 end = new Goto(block_at(s.cur_bci()), false); 2818 append(end); 2819 } 2820 assert(end == last()->as_BlockEnd(), "inconsistency"); 2821 2822 assert(end->state() != NULL, "state must already be present"); 2823 assert(end->as_Return() == NULL || end->as_Throw() == NULL || end->state()->stack_size() == 0, "stack not needed for return and throw"); 2824 2825 // connect to begin & set state 2826 // NOTE that inlining may have changed the block we are parsing 2827 block()->set_end(end); 2828 // propagate state 2829 for (int i = end->number_of_sux() - 1; i >= 0; i--) { 2830 BlockBegin* sux = end->sux_at(i); 2831 assert(sux->is_predecessor(block()), "predecessor missing"); 2832 // be careful, bailout if bytecodes are strange 2833 if (!sux->try_merge(end->state())) BAILOUT_("block join failed", NULL); 2834 scope_data()->add_to_work_list(end->sux_at(i)); 2835 } 2836 2837 scope_data()->set_stream(NULL); 2838 2839 // done 2840 return end; 2841} 2842 2843 2844void GraphBuilder::iterate_all_blocks(bool start_in_current_block_for_inlining) { 2845 do { 2846 if (start_in_current_block_for_inlining && !bailed_out()) { 2847 iterate_bytecodes_for_block(0); 2848 start_in_current_block_for_inlining = false; 2849 } else { 2850 BlockBegin* b; 2851 while ((b = scope_data()->remove_from_work_list()) != NULL) { 2852 if (!b->is_set(BlockBegin::was_visited_flag)) { 2853 if (b->is_set(BlockBegin::osr_entry_flag)) { 2854 // we're about to parse the osr entry block, so make sure 2855 // we setup the OSR edge leading into this block so that 2856 // Phis get setup correctly. 2857 setup_osr_entry_block(); 2858 // this is no longer the osr entry block, so clear it. 2859 b->clear(BlockBegin::osr_entry_flag); 2860 } 2861 b->set(BlockBegin::was_visited_flag); 2862 connect_to_end(b); 2863 } 2864 } 2865 } 2866 } while (!bailed_out() && !scope_data()->is_work_list_empty()); 2867} 2868 2869 2870bool GraphBuilder::_can_trap [Bytecodes::number_of_java_codes]; 2871 2872void GraphBuilder::initialize() { 2873 // the following bytecodes are assumed to potentially 2874 // throw exceptions in compiled code - note that e.g. 2875 // monitorexit & the return bytecodes do not throw 2876 // exceptions since monitor pairing proved that they 2877 // succeed (if monitor pairing succeeded) 2878 Bytecodes::Code can_trap_list[] = 2879 { Bytecodes::_ldc 2880 , Bytecodes::_ldc_w 2881 , Bytecodes::_ldc2_w 2882 , Bytecodes::_iaload 2883 , Bytecodes::_laload 2884 , Bytecodes::_faload 2885 , Bytecodes::_daload 2886 , Bytecodes::_aaload 2887 , Bytecodes::_baload 2888 , Bytecodes::_caload 2889 , Bytecodes::_saload 2890 , Bytecodes::_iastore 2891 , Bytecodes::_lastore 2892 , Bytecodes::_fastore 2893 , Bytecodes::_dastore 2894 , Bytecodes::_aastore 2895 , Bytecodes::_bastore 2896 , Bytecodes::_castore 2897 , Bytecodes::_sastore 2898 , Bytecodes::_idiv 2899 , Bytecodes::_ldiv 2900 , Bytecodes::_irem 2901 , Bytecodes::_lrem 2902 , Bytecodes::_getstatic 2903 , Bytecodes::_putstatic 2904 , Bytecodes::_getfield 2905 , Bytecodes::_putfield 2906 , Bytecodes::_invokevirtual 2907 , Bytecodes::_invokespecial 2908 , Bytecodes::_invokestatic 2909 , Bytecodes::_invokedynamic 2910 , Bytecodes::_invokeinterface 2911 , Bytecodes::_new 2912 , Bytecodes::_newarray 2913 , Bytecodes::_anewarray 2914 , Bytecodes::_arraylength 2915 , Bytecodes::_athrow 2916 , Bytecodes::_checkcast 2917 , Bytecodes::_instanceof 2918 , Bytecodes::_monitorenter 2919 , Bytecodes::_multianewarray 2920 }; 2921 2922 // inititialize trap tables 2923 for (int i = 0; i < Bytecodes::number_of_java_codes; i++) { 2924 _can_trap[i] = false; 2925 } 2926 // set standard trap info 2927 for (uint j = 0; j < ARRAY_SIZE(can_trap_list); j++) { 2928 _can_trap[can_trap_list[j]] = true; 2929 } 2930} 2931 2932 2933BlockBegin* GraphBuilder::header_block(BlockBegin* entry, BlockBegin::Flag f, ValueStack* state) { 2934 assert(entry->is_set(f), "entry/flag mismatch"); 2935 // create header block 2936 BlockBegin* h = new BlockBegin(entry->bci()); 2937 h->set_depth_first_number(0); 2938 2939 Value l = h; 2940 BlockEnd* g = new Goto(entry, false); 2941 l->set_next(g, entry->bci()); 2942 h->set_end(g); 2943 h->set(f); 2944 // setup header block end state 2945 ValueStack* s = state->copy(ValueStack::StateAfter, entry->bci()); // can use copy since stack is empty (=> no phis) 2946 assert(s->stack_is_empty(), "must have empty stack at entry point"); 2947 g->set_state(s); 2948 return h; 2949} 2950 2951 2952 2953BlockBegin* GraphBuilder::setup_start_block(int osr_bci, BlockBegin* std_entry, BlockBegin* osr_entry, ValueStack* state) { 2954 BlockBegin* start = new BlockBegin(0); 2955 2956 // This code eliminates the empty start block at the beginning of 2957 // each method. Previously, each method started with the 2958 // start-block created below, and this block was followed by the 2959 // header block that was always empty. This header block is only 2960 // necesary if std_entry is also a backward branch target because 2961 // then phi functions may be necessary in the header block. It's 2962 // also necessary when profiling so that there's a single block that 2963 // can increment the interpreter_invocation_count. 2964 BlockBegin* new_header_block; 2965 if (std_entry->number_of_preds() > 0 || count_invocations() || count_backedges()) { 2966 new_header_block = header_block(std_entry, BlockBegin::std_entry_flag, state); 2967 } else { 2968 new_header_block = std_entry; 2969 } 2970 2971 // setup start block (root for the IR graph) 2972 Base* base = 2973 new Base( 2974 new_header_block, 2975 osr_entry 2976 ); 2977 start->set_next(base, 0); 2978 start->set_end(base); 2979 // create & setup state for start block 2980 start->set_state(state->copy(ValueStack::StateAfter, std_entry->bci())); 2981 base->set_state(state->copy(ValueStack::StateAfter, std_entry->bci())); 2982 2983 if (base->std_entry()->state() == NULL) { 2984 // setup states for header blocks 2985 base->std_entry()->merge(state); 2986 } 2987 2988 assert(base->std_entry()->state() != NULL, ""); 2989 return start; 2990} 2991 2992 2993void GraphBuilder::setup_osr_entry_block() { 2994 assert(compilation()->is_osr_compile(), "only for osrs"); 2995 2996 int osr_bci = compilation()->osr_bci(); 2997 ciBytecodeStream s(method()); 2998 s.reset_to_bci(osr_bci); 2999 s.next(); 3000 scope_data()->set_stream(&s); 3001 3002 // create a new block to be the osr setup code 3003 _osr_entry = new BlockBegin(osr_bci); 3004 _osr_entry->set(BlockBegin::osr_entry_flag); 3005 _osr_entry->set_depth_first_number(0); 3006 BlockBegin* target = bci2block()->at(osr_bci); 3007 assert(target != NULL && target->is_set(BlockBegin::osr_entry_flag), "must be there"); 3008 // the osr entry has no values for locals 3009 ValueStack* state = target->state()->copy(); 3010 _osr_entry->set_state(state); 3011 3012 kill_all(); 3013 _block = _osr_entry; 3014 _state = _osr_entry->state()->copy(); 3015 assert(_state->bci() == osr_bci, "mismatch"); 3016 _last = _osr_entry; 3017 Value e = append(new OsrEntry()); 3018 e->set_needs_null_check(false); 3019 3020 // OSR buffer is 3021 // 3022 // locals[nlocals-1..0] 3023 // monitors[number_of_locks-1..0] 3024 // 3025 // locals is a direct copy of the interpreter frame so in the osr buffer 3026 // so first slot in the local array is the last local from the interpreter 3027 // and last slot is local[0] (receiver) from the interpreter 3028 // 3029 // Similarly with locks. The first lock slot in the osr buffer is the nth lock 3030 // from the interpreter frame, the nth lock slot in the osr buffer is 0th lock 3031 // in the interpreter frame (the method lock if a sync method) 3032 3033 // Initialize monitors in the compiled activation. 3034 3035 int index; 3036 Value local; 3037 3038 // find all the locals that the interpreter thinks contain live oops 3039 const BitMap live_oops = method()->live_local_oops_at_bci(osr_bci); 3040 3041 // compute the offset into the locals so that we can treat the buffer 3042 // as if the locals were still in the interpreter frame 3043 int locals_offset = BytesPerWord * (method()->max_locals() - 1); 3044 for_each_local_value(state, index, local) { 3045 int offset = locals_offset - (index + local->type()->size() - 1) * BytesPerWord; 3046 Value get; 3047 if (local->type()->is_object_kind() && !live_oops.at(index)) { 3048 // The interpreter thinks this local is dead but the compiler 3049 // doesn't so pretend that the interpreter passed in null. 3050 get = append(new Constant(objectNull)); 3051 } else { 3052 get = append(new UnsafeGetRaw(as_BasicType(local->type()), e, 3053 append(new Constant(new IntConstant(offset))), 3054 0, 3055 true /*unaligned*/, true /*wide*/)); 3056 } 3057 _state->store_local(index, get); 3058 } 3059 3060 // the storage for the OSR buffer is freed manually in the LIRGenerator. 3061 3062 assert(state->caller_state() == NULL, "should be top scope"); 3063 state->clear_locals(); 3064 Goto* g = new Goto(target, false); 3065 append(g); 3066 _osr_entry->set_end(g); 3067 target->merge(_osr_entry->end()->state()); 3068 3069 scope_data()->set_stream(NULL); 3070} 3071 3072 3073ValueStack* GraphBuilder::state_at_entry() { 3074 ValueStack* state = new ValueStack(scope(), NULL); 3075 3076 // Set up locals for receiver 3077 int idx = 0; 3078 if (!method()->is_static()) { 3079 // we should always see the receiver 3080 state->store_local(idx, new Local(method()->holder(), objectType, idx)); 3081 idx = 1; 3082 } 3083 3084 // Set up locals for incoming arguments 3085 ciSignature* sig = method()->signature(); 3086 for (int i = 0; i < sig->count(); i++) { 3087 ciType* type = sig->type_at(i); 3088 BasicType basic_type = type->basic_type(); 3089 // don't allow T_ARRAY to propagate into locals types 3090 if (basic_type == T_ARRAY) basic_type = T_OBJECT; 3091 ValueType* vt = as_ValueType(basic_type); 3092 state->store_local(idx, new Local(type, vt, idx)); 3093 idx += type->size(); 3094 } 3095 3096 // lock synchronized method 3097 if (method()->is_synchronized()) { 3098 state->lock(NULL); 3099 } 3100 3101 return state; 3102} 3103 3104 3105GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope) 3106 : _scope_data(NULL) 3107 , _instruction_count(0) 3108 , _osr_entry(NULL) 3109 , _memory(new MemoryBuffer()) 3110 , _compilation(compilation) 3111 , _inline_bailout_msg(NULL) 3112{ 3113 int osr_bci = compilation->osr_bci(); 3114 3115 // determine entry points and bci2block mapping 3116 BlockListBuilder blm(compilation, scope, osr_bci); 3117 CHECK_BAILOUT(); 3118 3119 BlockList* bci2block = blm.bci2block(); 3120 BlockBegin* start_block = bci2block->at(0); 3121 3122 push_root_scope(scope, bci2block, start_block); 3123 3124 // setup state for std entry 3125 _initial_state = state_at_entry(); 3126 start_block->merge(_initial_state); 3127 3128 // complete graph 3129 _vmap = new ValueMap(); 3130 switch (scope->method()->intrinsic_id()) { 3131 case vmIntrinsics::_dabs : // fall through 3132 case vmIntrinsics::_dsqrt : // fall through 3133 case vmIntrinsics::_dsin : // fall through 3134 case vmIntrinsics::_dcos : // fall through 3135 case vmIntrinsics::_dtan : // fall through 3136 case vmIntrinsics::_dlog : // fall through 3137 case vmIntrinsics::_dlog10 : // fall through 3138 case vmIntrinsics::_dexp : // fall through 3139 case vmIntrinsics::_dpow : // fall through 3140 { 3141 // Compiles where the root method is an intrinsic need a special 3142 // compilation environment because the bytecodes for the method 3143 // shouldn't be parsed during the compilation, only the special 3144 // Intrinsic node should be emitted. If this isn't done the the 3145 // code for the inlined version will be different than the root 3146 // compiled version which could lead to monotonicity problems on 3147 // intel. 3148 3149 // Set up a stream so that appending instructions works properly. 3150 ciBytecodeStream s(scope->method()); 3151 s.reset_to_bci(0); 3152 scope_data()->set_stream(&s); 3153 s.next(); 3154 3155 // setup the initial block state 3156 _block = start_block; 3157 _state = start_block->state()->copy_for_parsing(); 3158 _last = start_block; 3159 load_local(doubleType, 0); 3160 if (scope->method()->intrinsic_id() == vmIntrinsics::_dpow) { 3161 load_local(doubleType, 2); 3162 } 3163 3164 // Emit the intrinsic node. 3165 bool result = try_inline_intrinsics(scope->method()); 3166 if (!result) BAILOUT("failed to inline intrinsic"); 3167 method_return(dpop()); 3168 3169 // connect the begin and end blocks and we're all done. 3170 BlockEnd* end = last()->as_BlockEnd(); 3171 block()->set_end(end); 3172 break; 3173 } 3174 3175 case vmIntrinsics::_Reference_get: 3176 { 3177 { 3178 // With java.lang.ref.reference.get() we must go through the 3179 // intrinsic - when G1 is enabled - even when get() is the root 3180 // method of the compile so that, if necessary, the value in 3181 // the referent field of the reference object gets recorded by 3182 // the pre-barrier code. 3183 // Specifically, if G1 is enabled, the value in the referent 3184 // field is recorded by the G1 SATB pre barrier. This will 3185 // result in the referent being marked live and the reference 3186 // object removed from the list of discovered references during 3187 // reference processing. 3188 3189 // Also we need intrinsic to prevent commoning reads from this field 3190 // across safepoint since GC can change its value. 3191 3192 // Set up a stream so that appending instructions works properly. 3193 ciBytecodeStream s(scope->method()); 3194 s.reset_to_bci(0); 3195 scope_data()->set_stream(&s); 3196 s.next(); 3197 3198 // setup the initial block state 3199 _block = start_block; 3200 _state = start_block->state()->copy_for_parsing(); 3201 _last = start_block; 3202 load_local(objectType, 0); 3203 3204 // Emit the intrinsic node. 3205 bool result = try_inline_intrinsics(scope->method()); 3206 if (!result) BAILOUT("failed to inline intrinsic"); 3207 method_return(apop()); 3208 3209 // connect the begin and end blocks and we're all done. 3210 BlockEnd* end = last()->as_BlockEnd(); 3211 block()->set_end(end); 3212 break; 3213 } 3214 // Otherwise, fall thru 3215 } 3216 3217 default: 3218 scope_data()->add_to_work_list(start_block); 3219 iterate_all_blocks(); 3220 break; 3221 } 3222 CHECK_BAILOUT(); 3223 3224 _start = setup_start_block(osr_bci, start_block, _osr_entry, _initial_state); 3225 3226 eliminate_redundant_phis(_start); 3227 3228 NOT_PRODUCT(if (PrintValueNumbering && Verbose) print_stats()); 3229 // for osr compile, bailout if some requirements are not fulfilled 3230 if (osr_bci != -1) { 3231 BlockBegin* osr_block = blm.bci2block()->at(osr_bci); 3232 assert(osr_block->is_set(BlockBegin::was_visited_flag),"osr entry must have been visited for osr compile"); 3233 3234 // check if osr entry point has empty stack - we cannot handle non-empty stacks at osr entry points 3235 if (!osr_block->state()->stack_is_empty()) { 3236 BAILOUT("stack not empty at OSR entry point"); 3237 } 3238 } 3239#ifndef PRODUCT 3240 if (PrintCompilation && Verbose) tty->print_cr("Created %d Instructions", _instruction_count); 3241#endif 3242} 3243 3244 3245ValueStack* GraphBuilder::copy_state_before() { 3246 return copy_state_before_with_bci(bci()); 3247} 3248 3249ValueStack* GraphBuilder::copy_state_exhandling() { 3250 return copy_state_exhandling_with_bci(bci()); 3251} 3252 3253ValueStack* GraphBuilder::copy_state_for_exception() { 3254 return copy_state_for_exception_with_bci(bci()); 3255} 3256 3257ValueStack* GraphBuilder::copy_state_before_with_bci(int bci) { 3258 return state()->copy(ValueStack::StateBefore, bci); 3259} 3260 3261ValueStack* GraphBuilder::copy_state_exhandling_with_bci(int bci) { 3262 if (!has_handler()) return NULL; 3263 return state()->copy(ValueStack::StateBefore, bci); 3264} 3265 3266ValueStack* GraphBuilder::copy_state_for_exception_with_bci(int bci) { 3267 ValueStack* s = copy_state_exhandling_with_bci(bci); 3268 if (s == NULL) { 3269 if (_compilation->env()->should_retain_local_variables()) { 3270 s = state()->copy(ValueStack::ExceptionState, bci); 3271 } else { 3272 s = state()->copy(ValueStack::EmptyExceptionState, bci); 3273 } 3274 } 3275 return s; 3276} 3277 3278int GraphBuilder::recursive_inline_level(ciMethod* cur_callee) const { 3279 int recur_level = 0; 3280 for (IRScope* s = scope(); s != NULL; s = s->caller()) { 3281 if (s->method() == cur_callee) { 3282 ++recur_level; 3283 } 3284 } 3285 return recur_level; 3286} 3287 3288 3289bool GraphBuilder::try_inline(ciMethod* callee, bool holder_known, Bytecodes::Code bc, Value receiver) { 3290 const char* msg = NULL; 3291 3292 // clear out any existing inline bailout condition 3293 clear_inline_bailout(); 3294 3295 // exclude methods we don't want to inline 3296 msg = should_not_inline(callee); 3297 if (msg != NULL) { 3298 print_inlining(callee, msg, /*success*/ false); 3299 return false; 3300 } 3301 3302 // method handle invokes 3303 if (callee->is_method_handle_intrinsic()) { 3304 return try_method_handle_inline(callee); 3305 } 3306 3307 // handle intrinsics 3308 if (callee->intrinsic_id() != vmIntrinsics::_none) { 3309 if (try_inline_intrinsics(callee)) { 3310 print_inlining(callee, "intrinsic"); 3311 return true; 3312 } 3313 // try normal inlining 3314 } 3315 3316 // certain methods cannot be parsed at all 3317 msg = check_can_parse(callee); 3318 if (msg != NULL) { 3319 print_inlining(callee, msg, /*success*/ false); 3320 return false; 3321 } 3322 3323 // If bytecode not set use the current one. 3324 if (bc == Bytecodes::_illegal) { 3325 bc = code(); 3326 } 3327 if (try_inline_full(callee, holder_known, bc, receiver)) 3328 return true; 3329 3330 // Entire compilation could fail during try_inline_full call. 3331 // In that case printing inlining decision info is useless. 3332 if (!bailed_out()) 3333 print_inlining(callee, _inline_bailout_msg, /*success*/ false); 3334 3335 return false; 3336} 3337 3338 3339const char* GraphBuilder::check_can_parse(ciMethod* callee) const { 3340 // Certain methods cannot be parsed at all: 3341 if ( callee->is_native()) return "native method"; 3342 if ( callee->is_abstract()) return "abstract method"; 3343 if (!callee->can_be_compiled()) return "not compilable (disabled)"; 3344 return NULL; 3345} 3346 3347 3348// negative filter: should callee NOT be inlined? returns NULL, ok to inline, or rejection msg 3349const char* GraphBuilder::should_not_inline(ciMethod* callee) const { 3350 if ( callee->should_exclude()) return "excluded by CompilerOracle"; 3351 if ( callee->should_not_inline()) return "disallowed by CompilerOracle"; 3352 if ( callee->dont_inline()) return "don't inline by annotation"; 3353 return NULL; 3354} 3355 3356 3357bool GraphBuilder::try_inline_intrinsics(ciMethod* callee) { 3358 if (callee->is_synchronized()) { 3359 // We don't currently support any synchronized intrinsics 3360 return false; 3361 } 3362 3363 // callee seems like a good candidate 3364 // determine id 3365 vmIntrinsics::ID id = callee->intrinsic_id(); 3366 if (!InlineNatives && id != vmIntrinsics::_Reference_get) { 3367 // InlineNatives does not control Reference.get 3368 INLINE_BAILOUT("intrinsic method inlining disabled"); 3369 } 3370 bool preserves_state = false; 3371 bool cantrap = true; 3372 switch (id) { 3373 case vmIntrinsics::_arraycopy: 3374 if (!InlineArrayCopy) return false; 3375 break; 3376 3377#ifdef TRACE_HAVE_INTRINSICS 3378 case vmIntrinsics::_classID: 3379 case vmIntrinsics::_threadID: 3380 preserves_state = true; 3381 cantrap = true; 3382 break; 3383 3384 case vmIntrinsics::_counterTime: 3385 preserves_state = true; 3386 cantrap = false; 3387 break; 3388#endif 3389 3390 case vmIntrinsics::_currentTimeMillis: 3391 case vmIntrinsics::_nanoTime: 3392 preserves_state = true; 3393 cantrap = false; 3394 break; 3395 3396 case vmIntrinsics::_floatToRawIntBits : 3397 case vmIntrinsics::_intBitsToFloat : 3398 case vmIntrinsics::_doubleToRawLongBits : 3399 case vmIntrinsics::_longBitsToDouble : 3400 if (!InlineMathNatives) return false; 3401 preserves_state = true; 3402 cantrap = false; 3403 break; 3404 3405 case vmIntrinsics::_getClass : 3406 case vmIntrinsics::_isInstance : 3407 if (!InlineClassNatives) return false; 3408 preserves_state = true; 3409 break; 3410 3411 case vmIntrinsics::_currentThread : 3412 if (!InlineThreadNatives) return false; 3413 preserves_state = true; 3414 cantrap = false; 3415 break; 3416 3417 case vmIntrinsics::_dabs : // fall through 3418 case vmIntrinsics::_dsqrt : // fall through 3419 case vmIntrinsics::_dsin : // fall through 3420 case vmIntrinsics::_dcos : // fall through 3421 case vmIntrinsics::_dtan : // fall through 3422 case vmIntrinsics::_dlog : // fall through 3423 case vmIntrinsics::_dlog10 : // fall through 3424 case vmIntrinsics::_dexp : // fall through 3425 case vmIntrinsics::_dpow : // fall through 3426 if (!InlineMathNatives) return false; 3427 cantrap = false; 3428 preserves_state = true; 3429 break; 3430 3431 // Use special nodes for Unsafe instructions so we can more easily 3432 // perform an address-mode optimization on the raw variants 3433 case vmIntrinsics::_getObject : return append_unsafe_get_obj(callee, T_OBJECT, false); 3434 case vmIntrinsics::_getBoolean: return append_unsafe_get_obj(callee, T_BOOLEAN, false); 3435 case vmIntrinsics::_getByte : return append_unsafe_get_obj(callee, T_BYTE, false); 3436 case vmIntrinsics::_getShort : return append_unsafe_get_obj(callee, T_SHORT, false); 3437 case vmIntrinsics::_getChar : return append_unsafe_get_obj(callee, T_CHAR, false); 3438 case vmIntrinsics::_getInt : return append_unsafe_get_obj(callee, T_INT, false); 3439 case vmIntrinsics::_getLong : return append_unsafe_get_obj(callee, T_LONG, false); 3440 case vmIntrinsics::_getFloat : return append_unsafe_get_obj(callee, T_FLOAT, false); 3441 case vmIntrinsics::_getDouble : return append_unsafe_get_obj(callee, T_DOUBLE, false); 3442 3443 case vmIntrinsics::_putObject : return append_unsafe_put_obj(callee, T_OBJECT, false); 3444 case vmIntrinsics::_putBoolean: return append_unsafe_put_obj(callee, T_BOOLEAN, false); 3445 case vmIntrinsics::_putByte : return append_unsafe_put_obj(callee, T_BYTE, false); 3446 case vmIntrinsics::_putShort : return append_unsafe_put_obj(callee, T_SHORT, false); 3447 case vmIntrinsics::_putChar : return append_unsafe_put_obj(callee, T_CHAR, false); 3448 case vmIntrinsics::_putInt : return append_unsafe_put_obj(callee, T_INT, false); 3449 case vmIntrinsics::_putLong : return append_unsafe_put_obj(callee, T_LONG, false); 3450 case vmIntrinsics::_putFloat : return append_unsafe_put_obj(callee, T_FLOAT, false); 3451 case vmIntrinsics::_putDouble : return append_unsafe_put_obj(callee, T_DOUBLE, false); 3452 3453 case vmIntrinsics::_getObjectVolatile : return append_unsafe_get_obj(callee, T_OBJECT, true); 3454 case vmIntrinsics::_getBooleanVolatile: return append_unsafe_get_obj(callee, T_BOOLEAN, true); 3455 case vmIntrinsics::_getByteVolatile : return append_unsafe_get_obj(callee, T_BYTE, true); 3456 case vmIntrinsics::_getShortVolatile : return append_unsafe_get_obj(callee, T_SHORT, true); 3457 case vmIntrinsics::_getCharVolatile : return append_unsafe_get_obj(callee, T_CHAR, true); 3458 case vmIntrinsics::_getIntVolatile : return append_unsafe_get_obj(callee, T_INT, true); 3459 case vmIntrinsics::_getLongVolatile : return append_unsafe_get_obj(callee, T_LONG, true); 3460 case vmIntrinsics::_getFloatVolatile : return append_unsafe_get_obj(callee, T_FLOAT, true); 3461 case vmIntrinsics::_getDoubleVolatile : return append_unsafe_get_obj(callee, T_DOUBLE, true); 3462 3463 case vmIntrinsics::_putObjectVolatile : return append_unsafe_put_obj(callee, T_OBJECT, true); 3464 case vmIntrinsics::_putBooleanVolatile: return append_unsafe_put_obj(callee, T_BOOLEAN, true); 3465 case vmIntrinsics::_putByteVolatile : return append_unsafe_put_obj(callee, T_BYTE, true); 3466 case vmIntrinsics::_putShortVolatile : return append_unsafe_put_obj(callee, T_SHORT, true); 3467 case vmIntrinsics::_putCharVolatile : return append_unsafe_put_obj(callee, T_CHAR, true); 3468 case vmIntrinsics::_putIntVolatile : return append_unsafe_put_obj(callee, T_INT, true); 3469 case vmIntrinsics::_putLongVolatile : return append_unsafe_put_obj(callee, T_LONG, true); 3470 case vmIntrinsics::_putFloatVolatile : return append_unsafe_put_obj(callee, T_FLOAT, true); 3471 case vmIntrinsics::_putDoubleVolatile : return append_unsafe_put_obj(callee, T_DOUBLE, true); 3472 3473 case vmIntrinsics::_getByte_raw : return append_unsafe_get_raw(callee, T_BYTE); 3474 case vmIntrinsics::_getShort_raw : return append_unsafe_get_raw(callee, T_SHORT); 3475 case vmIntrinsics::_getChar_raw : return append_unsafe_get_raw(callee, T_CHAR); 3476 case vmIntrinsics::_getInt_raw : return append_unsafe_get_raw(callee, T_INT); 3477 case vmIntrinsics::_getLong_raw : return append_unsafe_get_raw(callee, T_LONG); 3478 case vmIntrinsics::_getFloat_raw : return append_unsafe_get_raw(callee, T_FLOAT); 3479 case vmIntrinsics::_getDouble_raw : return append_unsafe_get_raw(callee, T_DOUBLE); 3480 3481 case vmIntrinsics::_putByte_raw : return append_unsafe_put_raw(callee, T_BYTE); 3482 case vmIntrinsics::_putShort_raw : return append_unsafe_put_raw(callee, T_SHORT); 3483 case vmIntrinsics::_putChar_raw : return append_unsafe_put_raw(callee, T_CHAR); 3484 case vmIntrinsics::_putInt_raw : return append_unsafe_put_raw(callee, T_INT); 3485 case vmIntrinsics::_putLong_raw : return append_unsafe_put_raw(callee, T_LONG); 3486 case vmIntrinsics::_putFloat_raw : return append_unsafe_put_raw(callee, T_FLOAT); 3487 case vmIntrinsics::_putDouble_raw : return append_unsafe_put_raw(callee, T_DOUBLE); 3488 3489 case vmIntrinsics::_prefetchRead : return append_unsafe_prefetch(callee, false, false); 3490 case vmIntrinsics::_prefetchWrite : return append_unsafe_prefetch(callee, false, true); 3491 case vmIntrinsics::_prefetchReadStatic : return append_unsafe_prefetch(callee, true, false); 3492 case vmIntrinsics::_prefetchWriteStatic : return append_unsafe_prefetch(callee, true, true); 3493 3494 case vmIntrinsics::_checkIndex : 3495 if (!InlineNIOCheckIndex) return false; 3496 preserves_state = true; 3497 break; 3498 case vmIntrinsics::_putOrderedObject : return append_unsafe_put_obj(callee, T_OBJECT, true); 3499 case vmIntrinsics::_putOrderedInt : return append_unsafe_put_obj(callee, T_INT, true); 3500 case vmIntrinsics::_putOrderedLong : return append_unsafe_put_obj(callee, T_LONG, true); 3501 3502 case vmIntrinsics::_compareAndSwapLong: 3503 if (!VM_Version::supports_cx8()) return false; 3504 // fall through 3505 case vmIntrinsics::_compareAndSwapInt: 3506 case vmIntrinsics::_compareAndSwapObject: 3507 append_unsafe_CAS(callee); 3508 return true; 3509 3510 case vmIntrinsics::_getAndAddInt: 3511 if (!VM_Version::supports_atomic_getadd4()) { 3512 return false; 3513 } 3514 return append_unsafe_get_and_set_obj(callee, true); 3515 case vmIntrinsics::_getAndAddLong: 3516 if (!VM_Version::supports_atomic_getadd8()) { 3517 return false; 3518 } 3519 return append_unsafe_get_and_set_obj(callee, true); 3520 case vmIntrinsics::_getAndSetInt: 3521 if (!VM_Version::supports_atomic_getset4()) { 3522 return false; 3523 } 3524 return append_unsafe_get_and_set_obj(callee, false); 3525 case vmIntrinsics::_getAndSetLong: 3526 if (!VM_Version::supports_atomic_getset8()) { 3527 return false; 3528 } 3529 return append_unsafe_get_and_set_obj(callee, false); 3530 case vmIntrinsics::_getAndSetObject: 3531#ifdef _LP64 3532 if (!UseCompressedOops && !VM_Version::supports_atomic_getset8()) { 3533 return false; 3534 } 3535 if (UseCompressedOops && !VM_Version::supports_atomic_getset4()) { 3536 return false; 3537 } 3538#else 3539 if (!VM_Version::supports_atomic_getset4()) { 3540 return false; 3541 } 3542#endif 3543 return append_unsafe_get_and_set_obj(callee, false); 3544 3545 case vmIntrinsics::_Reference_get: 3546 // Use the intrinsic version of Reference.get() so that the value in 3547 // the referent field can be registered by the G1 pre-barrier code. 3548 // Also to prevent commoning reads from this field across safepoint 3549 // since GC can change its value. 3550 preserves_state = true; 3551 break; 3552 3553 case vmIntrinsics::_updateCRC32: 3554 case vmIntrinsics::_updateBytesCRC32: 3555 case vmIntrinsics::_updateByteBufferCRC32: 3556 if (!UseCRC32Intrinsics) return false; 3557 cantrap = false; 3558 preserves_state = true; 3559 break; 3560 3561 case vmIntrinsics::_loadFence : 3562 case vmIntrinsics::_storeFence: 3563 case vmIntrinsics::_fullFence : 3564 break; 3565 3566 default : return false; // do not inline 3567 } 3568 // create intrinsic node 3569 const bool has_receiver = !callee->is_static(); 3570 ValueType* result_type = as_ValueType(callee->return_type()); 3571 ValueStack* state_before = copy_state_for_exception(); 3572 3573 Values* args = state()->pop_arguments(callee->arg_size()); 3574 3575 if (is_profiling()) { 3576 // Don't profile in the special case where the root method 3577 // is the intrinsic 3578 if (callee != method()) { 3579 // Note that we'd collect profile data in this method if we wanted it. 3580 compilation()->set_would_profile(true); 3581 if (profile_calls()) { 3582 Value recv = NULL; 3583 if (has_receiver) { 3584 recv = args->at(0); 3585 null_check(recv); 3586 } 3587 profile_call(callee, recv, NULL, collect_args_for_profiling(args, callee, true), true); 3588 } 3589 } 3590 } 3591 3592 Intrinsic* result = new Intrinsic(result_type, id, args, has_receiver, state_before, 3593 preserves_state, cantrap); 3594 // append instruction & push result 3595 Value value = append_split(result); 3596 if (result_type != voidType) push(result_type, value); 3597 3598 if (callee != method() && profile_return() && result_type->is_object_kind()) { 3599 profile_return_type(result, callee); 3600 } 3601 3602 // done 3603 return true; 3604} 3605 3606 3607bool GraphBuilder::try_inline_jsr(int jsr_dest_bci) { 3608 // Introduce a new callee continuation point - all Ret instructions 3609 // will be replaced with Gotos to this point. 3610 BlockBegin* cont = block_at(next_bci()); 3611 assert(cont != NULL, "continuation must exist (BlockListBuilder starts a new block after a jsr"); 3612 3613 // Note: can not assign state to continuation yet, as we have to 3614 // pick up the state from the Ret instructions. 3615 3616 // Push callee scope 3617 push_scope_for_jsr(cont, jsr_dest_bci); 3618 3619 // Temporarily set up bytecode stream so we can append instructions 3620 // (only using the bci of this stream) 3621 scope_data()->set_stream(scope_data()->parent()->stream()); 3622 3623 BlockBegin* jsr_start_block = block_at(jsr_dest_bci); 3624 assert(jsr_start_block != NULL, "jsr start block must exist"); 3625 assert(!jsr_start_block->is_set(BlockBegin::was_visited_flag), "should not have visited jsr yet"); 3626 Goto* goto_sub = new Goto(jsr_start_block, false); 3627 // Must copy state to avoid wrong sharing when parsing bytecodes 3628 assert(jsr_start_block->state() == NULL, "should have fresh jsr starting block"); 3629 jsr_start_block->set_state(copy_state_before_with_bci(jsr_dest_bci)); 3630 append(goto_sub); 3631 _block->set_end(goto_sub); 3632 _last = _block = jsr_start_block; 3633 3634 // Clear out bytecode stream 3635 scope_data()->set_stream(NULL); 3636 3637 scope_data()->add_to_work_list(jsr_start_block); 3638 3639 // Ready to resume parsing in subroutine 3640 iterate_all_blocks(); 3641 3642 // If we bailed out during parsing, return immediately (this is bad news) 3643 CHECK_BAILOUT_(false); 3644 3645 // Detect whether the continuation can actually be reached. If not, 3646 // it has not had state set by the join() operations in 3647 // iterate_bytecodes_for_block()/ret() and we should not touch the 3648 // iteration state. The calling activation of 3649 // iterate_bytecodes_for_block will then complete normally. 3650 if (cont->state() != NULL) { 3651 if (!cont->is_set(BlockBegin::was_visited_flag)) { 3652 // add continuation to work list instead of parsing it immediately 3653 scope_data()->parent()->add_to_work_list(cont); 3654 } 3655 } 3656 3657 assert(jsr_continuation() == cont, "continuation must not have changed"); 3658 assert(!jsr_continuation()->is_set(BlockBegin::was_visited_flag) || 3659 jsr_continuation()->is_set(BlockBegin::parser_loop_header_flag), 3660 "continuation can only be visited in case of backward branches"); 3661 assert(_last && _last->as_BlockEnd(), "block must have end"); 3662 3663 // continuation is in work list, so end iteration of current block 3664 _skip_block = true; 3665 pop_scope_for_jsr(); 3666 3667 return true; 3668} 3669 3670 3671// Inline the entry of a synchronized method as a monitor enter and 3672// register the exception handler which releases the monitor if an 3673// exception is thrown within the callee. Note that the monitor enter 3674// cannot throw an exception itself, because the receiver is 3675// guaranteed to be non-null by the explicit null check at the 3676// beginning of inlining. 3677void GraphBuilder::inline_sync_entry(Value lock, BlockBegin* sync_handler) { 3678 assert(lock != NULL && sync_handler != NULL, "lock or handler missing"); 3679 3680 monitorenter(lock, SynchronizationEntryBCI); 3681 assert(_last->as_MonitorEnter() != NULL, "monitor enter expected"); 3682 _last->set_needs_null_check(false); 3683 3684 sync_handler->set(BlockBegin::exception_entry_flag); 3685 sync_handler->set(BlockBegin::is_on_work_list_flag); 3686 3687 ciExceptionHandler* desc = new ciExceptionHandler(method()->holder(), 0, method()->code_size(), -1, 0); 3688 XHandler* h = new XHandler(desc); 3689 h->set_entry_block(sync_handler); 3690 scope_data()->xhandlers()->append(h); 3691 scope_data()->set_has_handler(); 3692} 3693 3694 3695// If an exception is thrown and not handled within an inlined 3696// synchronized method, the monitor must be released before the 3697// exception is rethrown in the outer scope. Generate the appropriate 3698// instructions here. 3699void GraphBuilder::fill_sync_handler(Value lock, BlockBegin* sync_handler, bool default_handler) { 3700 BlockBegin* orig_block = _block; 3701 ValueStack* orig_state = _state; 3702 Instruction* orig_last = _last; 3703 _last = _block = sync_handler; 3704 _state = sync_handler->state()->copy(); 3705 3706 assert(sync_handler != NULL, "handler missing"); 3707 assert(!sync_handler->is_set(BlockBegin::was_visited_flag), "is visited here"); 3708 3709 assert(lock != NULL || default_handler, "lock or handler missing"); 3710 3711 XHandler* h = scope_data()->xhandlers()->remove_last(); 3712 assert(h->entry_block() == sync_handler, "corrupt list of handlers"); 3713 3714 block()->set(BlockBegin::was_visited_flag); 3715 Value exception = append_with_bci(new ExceptionObject(), SynchronizationEntryBCI); 3716 assert(exception->is_pinned(), "must be"); 3717 3718 int bci = SynchronizationEntryBCI; 3719 if (compilation()->env()->dtrace_method_probes()) { 3720 // Report exit from inline methods. We don't have a stream here 3721 // so pass an explicit bci of SynchronizationEntryBCI. 3722 Values* args = new Values(1); 3723 args->push(append_with_bci(new Constant(new MethodConstant(method())), bci)); 3724 append_with_bci(new RuntimeCall(voidType, "dtrace_method_exit", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), args), bci); 3725 } 3726 3727 if (lock) { 3728 assert(state()->locks_size() > 0 && state()->lock_at(state()->locks_size() - 1) == lock, "lock is missing"); 3729 if (!lock->is_linked()) { 3730 lock = append_with_bci(lock, bci); 3731 } 3732 3733 // exit the monitor in the context of the synchronized method 3734 monitorexit(lock, bci); 3735 3736 // exit the context of the synchronized method 3737 if (!default_handler) { 3738 pop_scope(); 3739 bci = _state->caller_state()->bci(); 3740 _state = _state->caller_state()->copy_for_parsing(); 3741 } 3742 } 3743 3744 // perform the throw as if at the the call site 3745 apush(exception); 3746 throw_op(bci); 3747 3748 BlockEnd* end = last()->as_BlockEnd(); 3749 block()->set_end(end); 3750 3751 _block = orig_block; 3752 _state = orig_state; 3753 _last = orig_last; 3754} 3755 3756 3757bool GraphBuilder::try_inline_full(ciMethod* callee, bool holder_known, Bytecodes::Code bc, Value receiver) { 3758 assert(!callee->is_native(), "callee must not be native"); 3759 if (CompilationPolicy::policy()->should_not_inline(compilation()->env(), callee)) { 3760 INLINE_BAILOUT("inlining prohibited by policy"); 3761 } 3762 // first perform tests of things it's not possible to inline 3763 if (callee->has_exception_handlers() && 3764 !InlineMethodsWithExceptionHandlers) INLINE_BAILOUT("callee has exception handlers"); 3765 if (callee->is_synchronized() && 3766 !InlineSynchronizedMethods ) INLINE_BAILOUT("callee is synchronized"); 3767 if (!callee->holder()->is_initialized()) INLINE_BAILOUT("callee's klass not initialized yet"); 3768 if (!callee->has_balanced_monitors()) INLINE_BAILOUT("callee's monitors do not match"); 3769 3770 // Proper inlining of methods with jsrs requires a little more work. 3771 if (callee->has_jsrs() ) INLINE_BAILOUT("jsrs not handled properly by inliner yet"); 3772 3773 // When SSE2 is used on intel, then no special handling is needed 3774 // for strictfp because the enum-constant is fixed at compile time, 3775 // the check for UseSSE2 is needed here 3776 if (strict_fp_requires_explicit_rounding && UseSSE < 2 && method()->is_strict() != callee->is_strict()) { 3777 INLINE_BAILOUT("caller and callee have different strict fp requirements"); 3778 } 3779 3780 if (is_profiling() && !callee->ensure_method_data()) { 3781 INLINE_BAILOUT("mdo allocation failed"); 3782 } 3783 3784 // now perform tests that are based on flag settings 3785 if (callee->force_inline() || callee->should_inline()) { 3786 if (inline_level() > MaxForceInlineLevel ) INLINE_BAILOUT("MaxForceInlineLevel"); 3787 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep"); 3788 3789 const char* msg = ""; 3790 if (callee->force_inline()) msg = "force inline by annotation"; 3791 if (callee->should_inline()) msg = "force inline by CompileOracle"; 3792 print_inlining(callee, msg); 3793 } else { 3794 // use heuristic controls on inlining 3795 if (inline_level() > MaxInlineLevel ) INLINE_BAILOUT("inlining too deep"); 3796 if (recursive_inline_level(callee) > MaxRecursiveInlineLevel) INLINE_BAILOUT("recursive inlining too deep"); 3797 if (callee->code_size_for_inlining() > max_inline_size() ) INLINE_BAILOUT("callee is too large"); 3798 3799 // don't inline throwable methods unless the inlining tree is rooted in a throwable class 3800 if (callee->name() == ciSymbol::object_initializer_name() && 3801 callee->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) { 3802 // Throwable constructor call 3803 IRScope* top = scope(); 3804 while (top->caller() != NULL) { 3805 top = top->caller(); 3806 } 3807 if (!top->method()->holder()->is_subclass_of(ciEnv::current()->Throwable_klass())) { 3808 INLINE_BAILOUT("don't inline Throwable constructors"); 3809 } 3810 } 3811 3812 if (compilation()->env()->num_inlined_bytecodes() > DesiredMethodLimit) { 3813 INLINE_BAILOUT("total inlining greater than DesiredMethodLimit"); 3814 } 3815 // printing 3816 print_inlining(callee); 3817 } 3818 3819 // NOTE: Bailouts from this point on, which occur at the 3820 // GraphBuilder level, do not cause bailout just of the inlining but 3821 // in fact of the entire compilation. 3822 3823 BlockBegin* orig_block = block(); 3824 3825 const bool is_invokedynamic = bc == Bytecodes::_invokedynamic; 3826 const bool has_receiver = (bc != Bytecodes::_invokestatic && !is_invokedynamic); 3827 3828 const int args_base = state()->stack_size() - callee->arg_size(); 3829 assert(args_base >= 0, "stack underflow during inlining"); 3830 3831 // Insert null check if necessary 3832 Value recv = NULL; 3833 if (has_receiver) { 3834 // note: null check must happen even if first instruction of callee does 3835 // an implicit null check since the callee is in a different scope 3836 // and we must make sure exception handling does the right thing 3837 assert(!callee->is_static(), "callee must not be static"); 3838 assert(callee->arg_size() > 0, "must have at least a receiver"); 3839 recv = state()->stack_at(args_base); 3840 null_check(recv); 3841 } 3842 3843 if (is_profiling()) { 3844 // Note that we'd collect profile data in this method if we wanted it. 3845 // this may be redundant here... 3846 compilation()->set_would_profile(true); 3847 3848 if (profile_calls()) { 3849 int start = 0; 3850 Values* obj_args = args_list_for_profiling(callee, start, has_receiver); 3851 if (obj_args != NULL) { 3852 int s = obj_args->size(); 3853 // if called through method handle invoke, some arguments may have been popped 3854 for (int i = args_base+start, j = 0; j < obj_args->size() && i < state()->stack_size(); ) { 3855 Value v = state()->stack_at_inc(i); 3856 if (v->type()->is_object_kind()) { 3857 obj_args->push(v); 3858 j++; 3859 } 3860 } 3861 check_args_for_profiling(obj_args, s); 3862 } 3863 profile_call(callee, recv, holder_known ? callee->holder() : NULL, obj_args, true); 3864 } 3865 } 3866 3867 // Introduce a new callee continuation point - if the callee has 3868 // more than one return instruction or the return does not allow 3869 // fall-through of control flow, all return instructions of the 3870 // callee will need to be replaced by Goto's pointing to this 3871 // continuation point. 3872 BlockBegin* cont = block_at(next_bci()); 3873 bool continuation_existed = true; 3874 if (cont == NULL) { 3875 cont = new BlockBegin(next_bci()); 3876 // low number so that continuation gets parsed as early as possible 3877 cont->set_depth_first_number(0); 3878#ifndef PRODUCT 3879 if (PrintInitialBlockList) { 3880 tty->print_cr("CFG: created block %d (bci %d) as continuation for inline at bci %d", 3881 cont->block_id(), cont->bci(), bci()); 3882 } 3883#endif 3884 continuation_existed = false; 3885 } 3886 // Record number of predecessors of continuation block before 3887 // inlining, to detect if inlined method has edges to its 3888 // continuation after inlining. 3889 int continuation_preds = cont->number_of_preds(); 3890 3891 // Push callee scope 3892 push_scope(callee, cont); 3893 3894 // the BlockListBuilder for the callee could have bailed out 3895 if (bailed_out()) 3896 return false; 3897 3898 // Temporarily set up bytecode stream so we can append instructions 3899 // (only using the bci of this stream) 3900 scope_data()->set_stream(scope_data()->parent()->stream()); 3901 3902 // Pass parameters into callee state: add assignments 3903 // note: this will also ensure that all arguments are computed before being passed 3904 ValueStack* callee_state = state(); 3905 ValueStack* caller_state = state()->caller_state(); 3906 for (int i = args_base; i < caller_state->stack_size(); ) { 3907 const int arg_no = i - args_base; 3908 Value arg = caller_state->stack_at_inc(i); 3909 store_local(callee_state, arg, arg_no); 3910 } 3911 3912 // Remove args from stack. 3913 // Note that we preserve locals state in case we can use it later 3914 // (see use of pop_scope() below) 3915 caller_state->truncate_stack(args_base); 3916 assert(callee_state->stack_size() == 0, "callee stack must be empty"); 3917 3918 Value lock; 3919 BlockBegin* sync_handler; 3920 3921 // Inline the locking of the receiver if the callee is synchronized 3922 if (callee->is_synchronized()) { 3923 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror()))) 3924 : state()->local_at(0); 3925 sync_handler = new BlockBegin(SynchronizationEntryBCI); 3926 inline_sync_entry(lock, sync_handler); 3927 } 3928 3929 if (compilation()->env()->dtrace_method_probes()) { 3930 Values* args = new Values(1); 3931 args->push(append(new Constant(new MethodConstant(method())))); 3932 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args)); 3933 } 3934 3935 if (profile_inlined_calls()) { 3936 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI)); 3937 } 3938 3939 BlockBegin* callee_start_block = block_at(0); 3940 if (callee_start_block != NULL) { 3941 assert(callee_start_block->is_set(BlockBegin::parser_loop_header_flag), "must be loop header"); 3942 Goto* goto_callee = new Goto(callee_start_block, false); 3943 // The state for this goto is in the scope of the callee, so use 3944 // the entry bci for the callee instead of the call site bci. 3945 append_with_bci(goto_callee, 0); 3946 _block->set_end(goto_callee); 3947 callee_start_block->merge(callee_state); 3948 3949 _last = _block = callee_start_block; 3950 3951 scope_data()->add_to_work_list(callee_start_block); 3952 } 3953 3954 // Clear out bytecode stream 3955 scope_data()->set_stream(NULL); 3956 3957 // Ready to resume parsing in callee (either in the same block we 3958 // were in before or in the callee's start block) 3959 iterate_all_blocks(callee_start_block == NULL); 3960 3961 // If we bailed out during parsing, return immediately (this is bad news) 3962 if (bailed_out()) 3963 return false; 3964 3965 // iterate_all_blocks theoretically traverses in random order; in 3966 // practice, we have only traversed the continuation if we are 3967 // inlining into a subroutine 3968 assert(continuation_existed || 3969 !continuation()->is_set(BlockBegin::was_visited_flag), 3970 "continuation should not have been parsed yet if we created it"); 3971 3972 // At this point we are almost ready to return and resume parsing of 3973 // the caller back in the GraphBuilder. The only thing we want to do 3974 // first is an optimization: during parsing of the callee we 3975 // generated at least one Goto to the continuation block. If we 3976 // generated exactly one, and if the inlined method spanned exactly 3977 // one block (and we didn't have to Goto its entry), then we snip 3978 // off the Goto to the continuation, allowing control to fall 3979 // through back into the caller block and effectively performing 3980 // block merging. This allows load elimination and CSE to take place 3981 // across multiple callee scopes if they are relatively simple, and 3982 // is currently essential to making inlining profitable. 3983 if (num_returns() == 1 3984 && block() == orig_block 3985 && block() == inline_cleanup_block()) { 3986 _last = inline_cleanup_return_prev(); 3987 _state = inline_cleanup_state(); 3988 } else if (continuation_preds == cont->number_of_preds()) { 3989 // Inlining caused that the instructions after the invoke in the 3990 // caller are not reachable any more. So skip filling this block 3991 // with instructions! 3992 assert(cont == continuation(), ""); 3993 assert(_last && _last->as_BlockEnd(), ""); 3994 _skip_block = true; 3995 } else { 3996 // Resume parsing in continuation block unless it was already parsed. 3997 // Note that if we don't change _last here, iteration in 3998 // iterate_bytecodes_for_block will stop when we return. 3999 if (!continuation()->is_set(BlockBegin::was_visited_flag)) { 4000 // add continuation to work list instead of parsing it immediately 4001 assert(_last && _last->as_BlockEnd(), ""); 4002 scope_data()->parent()->add_to_work_list(continuation()); 4003 _skip_block = true; 4004 } 4005 } 4006 4007 // Fill the exception handler for synchronized methods with instructions 4008 if (callee->is_synchronized() && sync_handler->state() != NULL) { 4009 fill_sync_handler(lock, sync_handler); 4010 } else { 4011 pop_scope(); 4012 } 4013 4014 compilation()->notice_inlined_method(callee); 4015 4016 return true; 4017} 4018 4019 4020bool GraphBuilder::try_method_handle_inline(ciMethod* callee) { 4021 ValueStack* state_before = state()->copy_for_parsing(); 4022 vmIntrinsics::ID iid = callee->intrinsic_id(); 4023 switch (iid) { 4024 case vmIntrinsics::_invokeBasic: 4025 { 4026 // get MethodHandle receiver 4027 const int args_base = state()->stack_size() - callee->arg_size(); 4028 ValueType* type = state()->stack_at(args_base)->type(); 4029 if (type->is_constant()) { 4030 ciMethod* target = type->as_ObjectType()->constant_value()->as_method_handle()->get_vmtarget(); 4031 // We don't do CHA here so only inline static and statically bindable methods. 4032 if (target->is_static() || target->can_be_statically_bound()) { 4033 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual; 4034 if (try_inline(target, /*holder_known*/ true, bc)) { 4035 return true; 4036 } 4037 } else { 4038 print_inlining(target, "not static or statically bindable", /*success*/ false); 4039 } 4040 } else { 4041 print_inlining(callee, "receiver not constant", /*success*/ false); 4042 } 4043 } 4044 break; 4045 4046 case vmIntrinsics::_linkToVirtual: 4047 case vmIntrinsics::_linkToStatic: 4048 case vmIntrinsics::_linkToSpecial: 4049 case vmIntrinsics::_linkToInterface: 4050 { 4051 // pop MemberName argument 4052 const int args_base = state()->stack_size() - callee->arg_size(); 4053 ValueType* type = apop()->type(); 4054 if (type->is_constant()) { 4055 ciMethod* target = type->as_ObjectType()->constant_value()->as_member_name()->get_vmtarget(); 4056 // If the target is another method handle invoke try recursivly to get 4057 // a better target. 4058 if (target->is_method_handle_intrinsic()) { 4059 if (try_method_handle_inline(target)) { 4060 return true; 4061 } 4062 } else { 4063 ciSignature* signature = target->signature(); 4064 const int receiver_skip = target->is_static() ? 0 : 1; 4065 // Cast receiver to its type. 4066 if (!target->is_static()) { 4067 ciKlass* tk = signature->accessing_klass(); 4068 Value obj = state()->stack_at(args_base); 4069 if (obj->exact_type() == NULL && 4070 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) { 4071 TypeCast* c = new TypeCast(tk, obj, state_before); 4072 append(c); 4073 state()->stack_at_put(args_base, c); 4074 } 4075 } 4076 // Cast reference arguments to its type. 4077 for (int i = 0, j = 0; i < signature->count(); i++) { 4078 ciType* t = signature->type_at(i); 4079 if (t->is_klass()) { 4080 ciKlass* tk = t->as_klass(); 4081 Value obj = state()->stack_at(args_base + receiver_skip + j); 4082 if (obj->exact_type() == NULL && 4083 obj->declared_type() != tk && tk != compilation()->env()->Object_klass()) { 4084 TypeCast* c = new TypeCast(t, obj, state_before); 4085 append(c); 4086 state()->stack_at_put(args_base + receiver_skip + j, c); 4087 } 4088 } 4089 j += t->size(); // long and double take two slots 4090 } 4091 // We don't do CHA here so only inline static and statically bindable methods. 4092 if (target->is_static() || target->can_be_statically_bound()) { 4093 Bytecodes::Code bc = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokevirtual; 4094 if (try_inline(target, /*holder_known*/ true, bc)) { 4095 return true; 4096 } 4097 } else { 4098 print_inlining(target, "not static or statically bindable", /*success*/ false); 4099 } 4100 } 4101 } else { 4102 print_inlining(callee, "MemberName not constant", /*success*/ false); 4103 } 4104 } 4105 break; 4106 4107 default: 4108 fatal(err_msg("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid))); 4109 break; 4110 } 4111 set_state(state_before); 4112 return false; 4113} 4114 4115 4116void GraphBuilder::inline_bailout(const char* msg) { 4117 assert(msg != NULL, "inline bailout msg must exist"); 4118 _inline_bailout_msg = msg; 4119} 4120 4121 4122void GraphBuilder::clear_inline_bailout() { 4123 _inline_bailout_msg = NULL; 4124} 4125 4126 4127void GraphBuilder::push_root_scope(IRScope* scope, BlockList* bci2block, BlockBegin* start) { 4128 ScopeData* data = new ScopeData(NULL); 4129 data->set_scope(scope); 4130 data->set_bci2block(bci2block); 4131 _scope_data = data; 4132 _block = start; 4133} 4134 4135 4136void GraphBuilder::push_scope(ciMethod* callee, BlockBegin* continuation) { 4137 IRScope* callee_scope = new IRScope(compilation(), scope(), bci(), callee, -1, false); 4138 scope()->add_callee(callee_scope); 4139 4140 BlockListBuilder blb(compilation(), callee_scope, -1); 4141 CHECK_BAILOUT(); 4142 4143 if (!blb.bci2block()->at(0)->is_set(BlockBegin::parser_loop_header_flag)) { 4144 // this scope can be inlined directly into the caller so remove 4145 // the block at bci 0. 4146 blb.bci2block()->at_put(0, NULL); 4147 } 4148 4149 set_state(new ValueStack(callee_scope, state()->copy(ValueStack::CallerState, bci()))); 4150 4151 ScopeData* data = new ScopeData(scope_data()); 4152 data->set_scope(callee_scope); 4153 data->set_bci2block(blb.bci2block()); 4154 data->set_continuation(continuation); 4155 _scope_data = data; 4156} 4157 4158 4159void GraphBuilder::push_scope_for_jsr(BlockBegin* jsr_continuation, int jsr_dest_bci) { 4160 ScopeData* data = new ScopeData(scope_data()); 4161 data->set_parsing_jsr(); 4162 data->set_jsr_entry_bci(jsr_dest_bci); 4163 data->set_jsr_return_address_local(-1); 4164 // Must clone bci2block list as we will be mutating it in order to 4165 // properly clone all blocks in jsr region as well as exception 4166 // handlers containing rets 4167 BlockList* new_bci2block = new BlockList(bci2block()->length()); 4168 new_bci2block->push_all(bci2block()); 4169 data->set_bci2block(new_bci2block); 4170 data->set_scope(scope()); 4171 data->setup_jsr_xhandlers(); 4172 data->set_continuation(continuation()); 4173 data->set_jsr_continuation(jsr_continuation); 4174 _scope_data = data; 4175} 4176 4177 4178void GraphBuilder::pop_scope() { 4179 int number_of_locks = scope()->number_of_locks(); 4180 _scope_data = scope_data()->parent(); 4181 // accumulate minimum number of monitor slots to be reserved 4182 scope()->set_min_number_of_locks(number_of_locks); 4183} 4184 4185 4186void GraphBuilder::pop_scope_for_jsr() { 4187 _scope_data = scope_data()->parent(); 4188} 4189 4190bool GraphBuilder::append_unsafe_get_obj(ciMethod* callee, BasicType t, bool is_volatile) { 4191 if (InlineUnsafeOps) { 4192 Values* args = state()->pop_arguments(callee->arg_size()); 4193 null_check(args->at(0)); 4194 Instruction* offset = args->at(2); 4195#ifndef _LP64 4196 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4197#endif 4198 Instruction* op = append(new UnsafeGetObject(t, args->at(1), offset, is_volatile)); 4199 push(op->type(), op); 4200 compilation()->set_has_unsafe_access(true); 4201 } 4202 return InlineUnsafeOps; 4203} 4204 4205 4206bool GraphBuilder::append_unsafe_put_obj(ciMethod* callee, BasicType t, bool is_volatile) { 4207 if (InlineUnsafeOps) { 4208 Values* args = state()->pop_arguments(callee->arg_size()); 4209 null_check(args->at(0)); 4210 Instruction* offset = args->at(2); 4211#ifndef _LP64 4212 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4213#endif 4214 Instruction* op = append(new UnsafePutObject(t, args->at(1), offset, args->at(3), is_volatile)); 4215 compilation()->set_has_unsafe_access(true); 4216 kill_all(); 4217 } 4218 return InlineUnsafeOps; 4219} 4220 4221 4222bool GraphBuilder::append_unsafe_get_raw(ciMethod* callee, BasicType t) { 4223 if (InlineUnsafeOps) { 4224 Values* args = state()->pop_arguments(callee->arg_size()); 4225 null_check(args->at(0)); 4226 Instruction* op = append(new UnsafeGetRaw(t, args->at(1), false)); 4227 push(op->type(), op); 4228 compilation()->set_has_unsafe_access(true); 4229 } 4230 return InlineUnsafeOps; 4231} 4232 4233 4234bool GraphBuilder::append_unsafe_put_raw(ciMethod* callee, BasicType t) { 4235 if (InlineUnsafeOps) { 4236 Values* args = state()->pop_arguments(callee->arg_size()); 4237 null_check(args->at(0)); 4238 Instruction* op = append(new UnsafePutRaw(t, args->at(1), args->at(2))); 4239 compilation()->set_has_unsafe_access(true); 4240 } 4241 return InlineUnsafeOps; 4242} 4243 4244 4245bool GraphBuilder::append_unsafe_prefetch(ciMethod* callee, bool is_static, bool is_store) { 4246 if (InlineUnsafeOps) { 4247 Values* args = state()->pop_arguments(callee->arg_size()); 4248 int obj_arg_index = 1; // Assume non-static case 4249 if (is_static) { 4250 obj_arg_index = 0; 4251 } else { 4252 null_check(args->at(0)); 4253 } 4254 Instruction* offset = args->at(obj_arg_index + 1); 4255#ifndef _LP64 4256 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4257#endif 4258 Instruction* op = is_store ? append(new UnsafePrefetchWrite(args->at(obj_arg_index), offset)) 4259 : append(new UnsafePrefetchRead (args->at(obj_arg_index), offset)); 4260 compilation()->set_has_unsafe_access(true); 4261 } 4262 return InlineUnsafeOps; 4263} 4264 4265 4266void GraphBuilder::append_unsafe_CAS(ciMethod* callee) { 4267 ValueStack* state_before = copy_state_for_exception(); 4268 ValueType* result_type = as_ValueType(callee->return_type()); 4269 assert(result_type->is_int(), "int result"); 4270 Values* args = state()->pop_arguments(callee->arg_size()); 4271 4272 // Pop off some args to speically handle, then push back 4273 Value newval = args->pop(); 4274 Value cmpval = args->pop(); 4275 Value offset = args->pop(); 4276 Value src = args->pop(); 4277 Value unsafe_obj = args->pop(); 4278 4279 // Separately handle the unsafe arg. It is not needed for code 4280 // generation, but must be null checked 4281 null_check(unsafe_obj); 4282 4283#ifndef _LP64 4284 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4285#endif 4286 4287 args->push(src); 4288 args->push(offset); 4289 args->push(cmpval); 4290 args->push(newval); 4291 4292 // An unsafe CAS can alias with other field accesses, but we don't 4293 // know which ones so mark the state as no preserved. This will 4294 // cause CSE to invalidate memory across it. 4295 bool preserves_state = false; 4296 Intrinsic* result = new Intrinsic(result_type, callee->intrinsic_id(), args, false, state_before, preserves_state); 4297 append_split(result); 4298 push(result_type, result); 4299 compilation()->set_has_unsafe_access(true); 4300} 4301 4302 4303void GraphBuilder::print_inlining(ciMethod* callee, const char* msg, bool success) { 4304 CompileLog* log = compilation()->log(); 4305 if (log != NULL) { 4306 if (success) { 4307 if (msg != NULL) 4308 log->inline_success(msg); 4309 else 4310 log->inline_success("receiver is statically known"); 4311 } else { 4312 if (msg != NULL) 4313 log->inline_fail(msg); 4314 else 4315 log->inline_fail("reason unknown"); 4316 } 4317 } 4318 4319 if (!PrintInlining && !compilation()->method()->has_option("PrintInlining")) { 4320 return; 4321 } 4322 CompileTask::print_inlining(callee, scope()->level(), bci(), msg); 4323 if (success && CIPrintMethodCodes) { 4324 callee->print_codes(); 4325 } 4326} 4327 4328bool GraphBuilder::append_unsafe_get_and_set_obj(ciMethod* callee, bool is_add) { 4329 if (InlineUnsafeOps) { 4330 Values* args = state()->pop_arguments(callee->arg_size()); 4331 BasicType t = callee->return_type()->basic_type(); 4332 null_check(args->at(0)); 4333 Instruction* offset = args->at(2); 4334#ifndef _LP64 4335 offset = append(new Convert(Bytecodes::_l2i, offset, as_ValueType(T_INT))); 4336#endif 4337 Instruction* op = append(new UnsafeGetAndSetObject(t, args->at(1), offset, args->at(3), is_add)); 4338 compilation()->set_has_unsafe_access(true); 4339 kill_all(); 4340 push(op->type(), op); 4341 } 4342 return InlineUnsafeOps; 4343} 4344 4345#ifndef PRODUCT 4346void GraphBuilder::print_stats() { 4347 vmap()->print(); 4348} 4349#endif // PRODUCT 4350 4351void GraphBuilder::profile_call(ciMethod* callee, Value recv, ciKlass* known_holder, Values* obj_args, bool inlined) { 4352 assert(known_holder == NULL || (known_holder->is_instance_klass() && 4353 (!known_holder->is_interface() || 4354 ((ciInstanceKlass*)known_holder)->has_default_methods())), "should be default method"); 4355 if (known_holder != NULL) { 4356 if (known_holder->exact_klass() == NULL) { 4357 known_holder = compilation()->cha_exact_type(known_holder); 4358 } 4359 } 4360 4361 append(new ProfileCall(method(), bci(), callee, recv, known_holder, obj_args, inlined)); 4362} 4363 4364void GraphBuilder::profile_return_type(Value ret, ciMethod* callee, ciMethod* m, int invoke_bci) { 4365 assert((m == NULL) == (invoke_bci < 0), "invalid method and invalid bci together"); 4366 if (m == NULL) { 4367 m = method(); 4368 } 4369 if (invoke_bci < 0) { 4370 invoke_bci = bci(); 4371 } 4372 ciMethodData* md = m->method_data_or_null(); 4373 ciProfileData* data = md->bci_to_data(invoke_bci); 4374 if (data->is_CallTypeData() || data->is_VirtualCallTypeData()) { 4375 append(new ProfileReturnType(m , invoke_bci, callee, ret)); 4376 } 4377} 4378 4379void GraphBuilder::profile_invocation(ciMethod* callee, ValueStack* state) { 4380 append(new ProfileInvoke(callee, state)); 4381} 4382