1 /* 2 * Copyright 2005-2010 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 # include "incls/_precompiled.incl" 26 # include "incls/_c1_LIRGenerator.cpp.incl" 27 28 #ifdef ASSERT 29 #define __ gen()->lir(__FILE__, __LINE__)-> 30 #else 31 #define __ gen()->lir()-> 32 #endif 33 34 35 void PhiResolverState::reset(int max_vregs) { 36 // Initialize array sizes 37 _virtual_operands.at_put_grow(max_vregs - 1, NULL, NULL); 38 _virtual_operands.trunc_to(0); 39 _other_operands.at_put_grow(max_vregs - 1, NULL, NULL); 40 _other_operands.trunc_to(0); 41 _vreg_table.at_put_grow(max_vregs - 1, NULL, NULL); 42 _vreg_table.trunc_to(0); 43 } 44 45 46 47 //-------------------------------------------------------------- 48 // PhiResolver 49 50 // Resolves cycles: 51 // 52 // r1 := r2 becomes temp := r1 53 // r2 := r1 r1 := r2 54 // r2 := temp 55 // and orders moves: 56 // 57 // r2 := r3 becomes r1 := r2 58 // r1 := r2 r2 := r3 59 60 PhiResolver::PhiResolver(LIRGenerator* gen, int max_vregs) 61 : _gen(gen) 62 , _state(gen->resolver_state()) 63 , _temp(LIR_OprFact::illegalOpr) 64 { 65 // reinitialize the shared state arrays 66 _state.reset(max_vregs); 67 } 68 69 70 void PhiResolver::emit_move(LIR_Opr src, LIR_Opr dest) { 71 assert(src->is_valid(), ""); 72 assert(dest->is_valid(), ""); 73 __ move(src, dest); 74 } 75 76 77 void PhiResolver::move_temp_to(LIR_Opr dest) { 78 assert(_temp->is_valid(), ""); 79 emit_move(_temp, dest); 80 NOT_PRODUCT(_temp = LIR_OprFact::illegalOpr); 81 } 82 83 84 void PhiResolver::move_to_temp(LIR_Opr src) { 85 assert(_temp->is_illegal(), ""); 86 _temp = _gen->new_register(src->type()); 87 emit_move(src, _temp); 88 } 89 90 91 // Traverse assignment graph in depth first order and generate moves in post order 92 // ie. two assignments: b := c, a := b start with node c: 93 // Call graph: move(NULL, c) -> move(c, b) -> move(b, a) 94 // Generates moves in this order: move b to a and move c to b 95 // ie. cycle a := b, b := a start with node a 96 // Call graph: move(NULL, a) -> move(a, b) -> move(b, a) 97 // Generates moves in this order: move b to temp, move a to b, move temp to a 98 void PhiResolver::move(ResolveNode* src, ResolveNode* dest) { 99 if (!dest->visited()) { 100 dest->set_visited(); 101 for (int i = dest->no_of_destinations()-1; i >= 0; i --) { 102 move(dest, dest->destination_at(i)); 103 } 104 } else if (!dest->start_node()) { 105 // cylce in graph detected 106 assert(_loop == NULL, "only one loop valid!"); 107 _loop = dest; 108 move_to_temp(src->operand()); 109 return; 110 } // else dest is a start node 111 112 if (!dest->assigned()) { 113 if (_loop == dest) { 114 move_temp_to(dest->operand()); 115 dest->set_assigned(); 116 } else if (src != NULL) { 117 emit_move(src->operand(), dest->operand()); 118 dest->set_assigned(); 119 } 120 } 121 } 122 123 124 PhiResolver::~PhiResolver() { 125 int i; 126 // resolve any cycles in moves from and to virtual registers 127 for (i = virtual_operands().length() - 1; i >= 0; i --) { 128 ResolveNode* node = virtual_operands()[i]; 129 if (!node->visited()) { 130 _loop = NULL; 131 move(NULL, node); 132 node->set_start_node(); 133 assert(_temp->is_illegal(), "move_temp_to() call missing"); 134 } 135 } 136 137 // generate move for move from non virtual register to abitrary destination 138 for (i = other_operands().length() - 1; i >= 0; i --) { 139 ResolveNode* node = other_operands()[i]; 140 for (int j = node->no_of_destinations() - 1; j >= 0; j --) { 141 emit_move(node->operand(), node->destination_at(j)->operand()); 142 } 143 } 144 } 145 146 147 ResolveNode* PhiResolver::create_node(LIR_Opr opr, bool source) { 148 ResolveNode* node; 149 if (opr->is_virtual()) { 150 int vreg_num = opr->vreg_number(); 151 node = vreg_table().at_grow(vreg_num, NULL); 152 assert(node == NULL || node->operand() == opr, ""); 153 if (node == NULL) { 154 node = new ResolveNode(opr); 155 vreg_table()[vreg_num] = node; 156 } 157 // Make sure that all virtual operands show up in the list when 158 // they are used as the source of a move. 159 if (source && !virtual_operands().contains(node)) { 160 virtual_operands().append(node); 161 } 162 } else { 163 assert(source, ""); 164 node = new ResolveNode(opr); 165 other_operands().append(node); 166 } 167 return node; 168 } 169 170 171 void PhiResolver::move(LIR_Opr src, LIR_Opr dest) { 172 assert(dest->is_virtual(), ""); 173 // tty->print("move "); src->print(); tty->print(" to "); dest->print(); tty->cr(); 174 assert(src->is_valid(), ""); 175 assert(dest->is_valid(), ""); 176 ResolveNode* source = source_node(src); 177 source->append(destination_node(dest)); 178 } 179 180 181 //-------------------------------------------------------------- 182 // LIRItem 183 184 void LIRItem::set_result(LIR_Opr opr) { 185 assert(value()->operand()->is_illegal() || value()->operand()->is_constant(), "operand should never change"); 186 value()->set_operand(opr); 187 188 if (opr->is_virtual()) { 189 _gen->_instruction_for_operand.at_put_grow(opr->vreg_number(), value(), NULL); 190 } 191 192 _result = opr; 193 } 194 195 void LIRItem::load_item() { 196 if (result()->is_illegal()) { 197 // update the items result 198 _result = value()->operand(); 199 } 200 if (!result()->is_register()) { 201 LIR_Opr reg = _gen->new_register(value()->type()); 202 __ move(result(), reg); 203 if (result()->is_constant()) { 204 _result = reg; 205 } else { 206 set_result(reg); 207 } 208 } 209 } 210 211 212 void LIRItem::load_for_store(BasicType type) { 213 if (_gen->can_store_as_constant(value(), type)) { 214 _result = value()->operand(); 215 if (!_result->is_constant()) { 216 _result = LIR_OprFact::value_type(value()->type()); 217 } 218 } else if (type == T_BYTE || type == T_BOOLEAN) { 219 load_byte_item(); 220 } else { 221 load_item(); 222 } 223 } 224 225 void LIRItem::load_item_force(LIR_Opr reg) { 226 LIR_Opr r = result(); 227 if (r != reg) { 228 if (r->type() != reg->type()) { 229 // moves between different types need an intervening spill slot 230 LIR_Opr tmp = _gen->force_to_spill(r, reg->type()); 231 __ move(tmp, reg); 232 } else { 233 __ move(r, reg); 234 } 235 _result = reg; 236 } 237 } 238 239 ciObject* LIRItem::get_jobject_constant() const { 240 ObjectType* oc = type()->as_ObjectType(); 241 if (oc) { 242 return oc->constant_value(); 243 } 244 return NULL; 245 } 246 247 248 jint LIRItem::get_jint_constant() const { 249 assert(is_constant() && value() != NULL, ""); 250 assert(type()->as_IntConstant() != NULL, "type check"); 251 return type()->as_IntConstant()->value(); 252 } 253 254 255 jint LIRItem::get_address_constant() const { 256 assert(is_constant() && value() != NULL, ""); 257 assert(type()->as_AddressConstant() != NULL, "type check"); 258 return type()->as_AddressConstant()->value(); 259 } 260 261 262 jfloat LIRItem::get_jfloat_constant() const { 263 assert(is_constant() && value() != NULL, ""); 264 assert(type()->as_FloatConstant() != NULL, "type check"); 265 return type()->as_FloatConstant()->value(); 266 } 267 268 269 jdouble LIRItem::get_jdouble_constant() const { 270 assert(is_constant() && value() != NULL, ""); 271 assert(type()->as_DoubleConstant() != NULL, "type check"); 272 return type()->as_DoubleConstant()->value(); 273 } 274 275 276 jlong LIRItem::get_jlong_constant() const { 277 assert(is_constant() && value() != NULL, ""); 278 assert(type()->as_LongConstant() != NULL, "type check"); 279 return type()->as_LongConstant()->value(); 280 } 281 282 283 284 //-------------------------------------------------------------- 285 286 287 void LIRGenerator::init() { 288 _bs = Universe::heap()->barrier_set(); 289 } 290 291 292 void LIRGenerator::block_do_prolog(BlockBegin* block) { 293 #ifndef PRODUCT 294 if (PrintIRWithLIR) { 295 block->print(); 296 } 297 #endif 298 299 // set up the list of LIR instructions 300 assert(block->lir() == NULL, "LIR list already computed for this block"); 301 _lir = new LIR_List(compilation(), block); 302 block->set_lir(_lir); 303 304 __ branch_destination(block->label()); 305 306 if (LIRTraceExecution && 307 Compilation::current_compilation()->hir()->start()->block_id() != block->block_id() && 308 !block->is_set(BlockBegin::exception_entry_flag)) { 309 assert(block->lir()->instructions_list()->length() == 1, "should come right after br_dst"); 310 trace_block_entry(block); 311 } 312 } 313 314 315 void LIRGenerator::block_do_epilog(BlockBegin* block) { 316 #ifndef PRODUCT 317 if (PrintIRWithLIR) { 318 tty->cr(); 319 } 320 #endif 321 322 // LIR_Opr for unpinned constants shouldn't be referenced by other 323 // blocks so clear them out after processing the block. 324 for (int i = 0; i < _unpinned_constants.length(); i++) { 325 _unpinned_constants.at(i)->clear_operand(); 326 } 327 _unpinned_constants.trunc_to(0); 328 329 // clear our any registers for other local constants 330 _constants.trunc_to(0); 331 _reg_for_constants.trunc_to(0); 332 } 333 334 335 void LIRGenerator::block_do(BlockBegin* block) { 336 CHECK_BAILOUT(); 337 338 block_do_prolog(block); 339 set_block(block); 340 341 for (Instruction* instr = block; instr != NULL; instr = instr->next()) { 342 if (instr->is_pinned()) do_root(instr); 343 } 344 345 set_block(NULL); 346 block_do_epilog(block); 347 } 348 349 350 //-------------------------LIRGenerator----------------------------- 351 352 // This is where the tree-walk starts; instr must be root; 353 void LIRGenerator::do_root(Value instr) { 354 CHECK_BAILOUT(); 355 356 InstructionMark im(compilation(), instr); 357 358 assert(instr->is_pinned(), "use only with roots"); 359 assert(instr->subst() == instr, "shouldn't have missed substitution"); 360 361 instr->visit(this); 362 363 assert(!instr->has_uses() || instr->operand()->is_valid() || 364 instr->as_Constant() != NULL || bailed_out(), "invalid item set"); 365 } 366 367 368 // This is called for each node in tree; the walk stops if a root is reached 369 void LIRGenerator::walk(Value instr) { 370 InstructionMark im(compilation(), instr); 371 //stop walk when encounter a root 372 if (instr->is_pinned() && instr->as_Phi() == NULL || instr->operand()->is_valid()) { 373 assert(instr->operand() != LIR_OprFact::illegalOpr || instr->as_Constant() != NULL, "this root has not yet been visited"); 374 } else { 375 assert(instr->subst() == instr, "shouldn't have missed substitution"); 376 instr->visit(this); 377 // assert(instr->use_count() > 0 || instr->as_Phi() != NULL, "leaf instruction must have a use"); 378 } 379 } 380 381 382 CodeEmitInfo* LIRGenerator::state_for(Instruction* x, ValueStack* state, bool ignore_xhandler) { 383 int index; 384 Value value; 385 for_each_stack_value(state, index, value) { 386 assert(value->subst() == value, "missed substition"); 387 if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) { 388 walk(value); 389 assert(value->operand()->is_valid(), "must be evaluated now"); 390 } 391 } 392 ValueStack* s = state; 393 int bci = x->bci(); 394 for_each_state(s) { 395 IRScope* scope = s->scope(); 396 ciMethod* method = scope->method(); 397 398 MethodLivenessResult liveness = method->liveness_at_bci(bci); 399 if (bci == SynchronizationEntryBCI) { 400 if (x->as_ExceptionObject() || x->as_Throw()) { 401 // all locals are dead on exit from the synthetic unlocker 402 liveness.clear(); 403 } else { 404 assert(x->as_MonitorEnter(), "only other case is MonitorEnter"); 405 } 406 } 407 if (!liveness.is_valid()) { 408 // Degenerate or breakpointed method. 409 bailout("Degenerate or breakpointed method"); 410 } else { 411 assert((int)liveness.size() == s->locals_size(), "error in use of liveness"); 412 for_each_local_value(s, index, value) { 413 assert(value->subst() == value, "missed substition"); 414 if (liveness.at(index) && !value->type()->is_illegal()) { 415 if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) { 416 walk(value); 417 assert(value->operand()->is_valid(), "must be evaluated now"); 418 } 419 } else { 420 // NULL out this local so that linear scan can assume that all non-NULL values are live. 421 s->invalidate_local(index); 422 } 423 } 424 } 425 bci = scope->caller_bci(); 426 } 427 428 return new CodeEmitInfo(x->bci(), state, ignore_xhandler ? NULL : x->exception_handlers()); 429 } 430 431 432 CodeEmitInfo* LIRGenerator::state_for(Instruction* x) { 433 return state_for(x, x->lock_stack()); 434 } 435 436 437 void LIRGenerator::jobject2reg_with_patching(LIR_Opr r, ciObject* obj, CodeEmitInfo* info) { 438 if (!obj->is_loaded() || PatchALot) { 439 assert(info != NULL, "info must be set if class is not loaded"); 440 __ oop2reg_patch(NULL, r, info); 441 } else { 442 // no patching needed 443 __ oop2reg(obj->constant_encoding(), r); 444 } 445 } 446 447 448 void LIRGenerator::array_range_check(LIR_Opr array, LIR_Opr index, 449 CodeEmitInfo* null_check_info, CodeEmitInfo* range_check_info) { 450 CodeStub* stub = new RangeCheckStub(range_check_info, index); 451 if (index->is_constant()) { 452 cmp_mem_int(lir_cond_belowEqual, array, arrayOopDesc::length_offset_in_bytes(), 453 index->as_jint(), null_check_info); 454 __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch 455 } else { 456 cmp_reg_mem(lir_cond_aboveEqual, index, array, 457 arrayOopDesc::length_offset_in_bytes(), T_INT, null_check_info); 458 __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch 459 } 460 } 461 462 463 void LIRGenerator::nio_range_check(LIR_Opr buffer, LIR_Opr index, LIR_Opr result, CodeEmitInfo* info) { 464 CodeStub* stub = new RangeCheckStub(info, index, true); 465 if (index->is_constant()) { 466 cmp_mem_int(lir_cond_belowEqual, buffer, java_nio_Buffer::limit_offset(), index->as_jint(), info); 467 __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch 468 } else { 469 cmp_reg_mem(lir_cond_aboveEqual, index, buffer, 470 java_nio_Buffer::limit_offset(), T_INT, info); 471 __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch 472 } 473 __ move(index, result); 474 } 475 476 477 // increment a counter returning the incremented value 478 LIR_Opr LIRGenerator::increment_and_return_counter(LIR_Opr base, int offset, int increment) { 479 LIR_Address* counter = new LIR_Address(base, offset, T_INT); 480 LIR_Opr result = new_register(T_INT); 481 __ load(counter, result); 482 __ add(result, LIR_OprFact::intConst(increment), result); 483 __ store(result, counter); 484 return result; 485 } 486 487 488 void LIRGenerator::arithmetic_op(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp_op, CodeEmitInfo* info) { 489 LIR_Opr result_op = result; 490 LIR_Opr left_op = left; 491 LIR_Opr right_op = right; 492 493 if (TwoOperandLIRForm && left_op != result_op) { 494 assert(right_op != result_op, "malformed"); 495 __ move(left_op, result_op); 496 left_op = result_op; 497 } 498 499 switch(code) { 500 case Bytecodes::_dadd: 501 case Bytecodes::_fadd: 502 case Bytecodes::_ladd: 503 case Bytecodes::_iadd: __ add(left_op, right_op, result_op); break; 504 case Bytecodes::_fmul: 505 case Bytecodes::_lmul: __ mul(left_op, right_op, result_op); break; 506 507 case Bytecodes::_dmul: 508 { 509 if (is_strictfp) { 510 __ mul_strictfp(left_op, right_op, result_op, tmp_op); break; 511 } else { 512 __ mul(left_op, right_op, result_op); break; 513 } 514 } 515 break; 516 517 case Bytecodes::_imul: 518 { 519 bool did_strength_reduce = false; 520 521 if (right->is_constant()) { 522 int c = right->as_jint(); 523 if (is_power_of_2(c)) { 524 // do not need tmp here 525 __ shift_left(left_op, exact_log2(c), result_op); 526 did_strength_reduce = true; 527 } else { 528 did_strength_reduce = strength_reduce_multiply(left_op, c, result_op, tmp_op); 529 } 530 } 531 // we couldn't strength reduce so just emit the multiply 532 if (!did_strength_reduce) { 533 __ mul(left_op, right_op, result_op); 534 } 535 } 536 break; 537 538 case Bytecodes::_dsub: 539 case Bytecodes::_fsub: 540 case Bytecodes::_lsub: 541 case Bytecodes::_isub: __ sub(left_op, right_op, result_op); break; 542 543 case Bytecodes::_fdiv: __ div (left_op, right_op, result_op); break; 544 // ldiv and lrem are implemented with a direct runtime call 545 546 case Bytecodes::_ddiv: 547 { 548 if (is_strictfp) { 549 __ div_strictfp (left_op, right_op, result_op, tmp_op); break; 550 } else { 551 __ div (left_op, right_op, result_op); break; 552 } 553 } 554 break; 555 556 case Bytecodes::_drem: 557 case Bytecodes::_frem: __ rem (left_op, right_op, result_op); break; 558 559 default: ShouldNotReachHere(); 560 } 561 } 562 563 564 void LIRGenerator::arithmetic_op_int(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, LIR_Opr tmp) { 565 arithmetic_op(code, result, left, right, false, tmp); 566 } 567 568 569 void LIRGenerator::arithmetic_op_long(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, CodeEmitInfo* info) { 570 arithmetic_op(code, result, left, right, false, LIR_OprFact::illegalOpr, info); 571 } 572 573 574 void LIRGenerator::arithmetic_op_fpu(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp) { 575 arithmetic_op(code, result, left, right, is_strictfp, tmp); 576 } 577 578 579 void LIRGenerator::shift_op(Bytecodes::Code code, LIR_Opr result_op, LIR_Opr value, LIR_Opr count, LIR_Opr tmp) { 580 if (TwoOperandLIRForm && value != result_op) { 581 assert(count != result_op, "malformed"); 582 __ move(value, result_op); 583 value = result_op; 584 } 585 586 assert(count->is_constant() || count->is_register(), "must be"); 587 switch(code) { 588 case Bytecodes::_ishl: 589 case Bytecodes::_lshl: __ shift_left(value, count, result_op, tmp); break; 590 case Bytecodes::_ishr: 591 case Bytecodes::_lshr: __ shift_right(value, count, result_op, tmp); break; 592 case Bytecodes::_iushr: 593 case Bytecodes::_lushr: __ unsigned_shift_right(value, count, result_op, tmp); break; 594 default: ShouldNotReachHere(); 595 } 596 } 597 598 599 void LIRGenerator::logic_op (Bytecodes::Code code, LIR_Opr result_op, LIR_Opr left_op, LIR_Opr right_op) { 600 if (TwoOperandLIRForm && left_op != result_op) { 601 assert(right_op != result_op, "malformed"); 602 __ move(left_op, result_op); 603 left_op = result_op; 604 } 605 606 switch(code) { 607 case Bytecodes::_iand: 608 case Bytecodes::_land: __ logical_and(left_op, right_op, result_op); break; 609 610 case Bytecodes::_ior: 611 case Bytecodes::_lor: __ logical_or(left_op, right_op, result_op); break; 612 613 case Bytecodes::_ixor: 614 case Bytecodes::_lxor: __ logical_xor(left_op, right_op, result_op); break; 615 616 default: ShouldNotReachHere(); 617 } 618 } 619 620 621 void LIRGenerator::monitor_enter(LIR_Opr object, LIR_Opr lock, LIR_Opr hdr, LIR_Opr scratch, int monitor_no, CodeEmitInfo* info_for_exception, CodeEmitInfo* info) { 622 if (!GenerateSynchronizationCode) return; 623 // for slow path, use debug info for state after successful locking 624 CodeStub* slow_path = new MonitorEnterStub(object, lock, info); 625 __ load_stack_address_monitor(monitor_no, lock); 626 // for handling NullPointerException, use debug info representing just the lock stack before this monitorenter 627 __ lock_object(hdr, object, lock, scratch, slow_path, info_for_exception); 628 } 629 630 631 void LIRGenerator::monitor_exit(LIR_Opr object, LIR_Opr lock, LIR_Opr new_hdr, int monitor_no) { 632 if (!GenerateSynchronizationCode) return; 633 // setup registers 634 LIR_Opr hdr = lock; 635 lock = new_hdr; 636 CodeStub* slow_path = new MonitorExitStub(lock, UseFastLocking, monitor_no); 637 __ load_stack_address_monitor(monitor_no, lock); 638 __ unlock_object(hdr, object, lock, slow_path); 639 } 640 641 642 void LIRGenerator::new_instance(LIR_Opr dst, ciInstanceKlass* klass, LIR_Opr scratch1, LIR_Opr scratch2, LIR_Opr scratch3, LIR_Opr scratch4, LIR_Opr klass_reg, CodeEmitInfo* info) { 643 jobject2reg_with_patching(klass_reg, klass, info); 644 // If klass is not loaded we do not know if the klass has finalizers: 645 if (UseFastNewInstance && klass->is_loaded() 646 && !Klass::layout_helper_needs_slow_path(klass->layout_helper())) { 647 648 Runtime1::StubID stub_id = klass->is_initialized() ? Runtime1::fast_new_instance_id : Runtime1::fast_new_instance_init_check_id; 649 650 CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, stub_id); 651 652 assert(klass->is_loaded(), "must be loaded"); 653 // allocate space for instance 654 assert(klass->size_helper() >= 0, "illegal instance size"); 655 const int instance_size = align_object_size(klass->size_helper()); 656 __ allocate_object(dst, scratch1, scratch2, scratch3, scratch4, 657 oopDesc::header_size(), instance_size, klass_reg, !klass->is_initialized(), slow_path); 658 } else { 659 CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, Runtime1::new_instance_id); 660 __ branch(lir_cond_always, T_ILLEGAL, slow_path); 661 __ branch_destination(slow_path->continuation()); 662 } 663 } 664 665 666 static bool is_constant_zero(Instruction* inst) { 667 IntConstant* c = inst->type()->as_IntConstant(); 668 if (c) { 669 return (c->value() == 0); 670 } 671 return false; 672 } 673 674 675 static bool positive_constant(Instruction* inst) { 676 IntConstant* c = inst->type()->as_IntConstant(); 677 if (c) { 678 return (c->value() >= 0); 679 } 680 return false; 681 } 682 683 684 static ciArrayKlass* as_array_klass(ciType* type) { 685 if (type != NULL && type->is_array_klass() && type->is_loaded()) { 686 return (ciArrayKlass*)type; 687 } else { 688 return NULL; 689 } 690 } 691 692 void LIRGenerator::arraycopy_helper(Intrinsic* x, int* flagsp, ciArrayKlass** expected_typep) { 693 Instruction* src = x->argument_at(0); 694 Instruction* src_pos = x->argument_at(1); 695 Instruction* dst = x->argument_at(2); 696 Instruction* dst_pos = x->argument_at(3); 697 Instruction* length = x->argument_at(4); 698 699 // first try to identify the likely type of the arrays involved 700 ciArrayKlass* expected_type = NULL; 701 bool is_exact = false; 702 { 703 ciArrayKlass* src_exact_type = as_array_klass(src->exact_type()); 704 ciArrayKlass* src_declared_type = as_array_klass(src->declared_type()); 705 ciArrayKlass* dst_exact_type = as_array_klass(dst->exact_type()); 706 ciArrayKlass* dst_declared_type = as_array_klass(dst->declared_type()); 707 if (src_exact_type != NULL && src_exact_type == dst_exact_type) { 708 // the types exactly match so the type is fully known 709 is_exact = true; 710 expected_type = src_exact_type; 711 } else if (dst_exact_type != NULL && dst_exact_type->is_obj_array_klass()) { 712 ciArrayKlass* dst_type = (ciArrayKlass*) dst_exact_type; 713 ciArrayKlass* src_type = NULL; 714 if (src_exact_type != NULL && src_exact_type->is_obj_array_klass()) { 715 src_type = (ciArrayKlass*) src_exact_type; 716 } else if (src_declared_type != NULL && src_declared_type->is_obj_array_klass()) { 717 src_type = (ciArrayKlass*) src_declared_type; 718 } 719 if (src_type != NULL) { 720 if (src_type->element_type()->is_subtype_of(dst_type->element_type())) { 721 is_exact = true; 722 expected_type = dst_type; 723 } 724 } 725 } 726 // at least pass along a good guess 727 if (expected_type == NULL) expected_type = dst_exact_type; 728 if (expected_type == NULL) expected_type = src_declared_type; 729 if (expected_type == NULL) expected_type = dst_declared_type; 730 } 731 732 // if a probable array type has been identified, figure out if any 733 // of the required checks for a fast case can be elided. 734 int flags = LIR_OpArrayCopy::all_flags; 735 if (expected_type != NULL) { 736 // try to skip null checks 737 if (src->as_NewArray() != NULL) 738 flags &= ~LIR_OpArrayCopy::src_null_check; 739 if (dst->as_NewArray() != NULL) 740 flags &= ~LIR_OpArrayCopy::dst_null_check; 741 742 // check from incoming constant values 743 if (positive_constant(src_pos)) 744 flags &= ~LIR_OpArrayCopy::src_pos_positive_check; 745 if (positive_constant(dst_pos)) 746 flags &= ~LIR_OpArrayCopy::dst_pos_positive_check; 747 if (positive_constant(length)) 748 flags &= ~LIR_OpArrayCopy::length_positive_check; 749 750 // see if the range check can be elided, which might also imply 751 // that src or dst is non-null. 752 ArrayLength* al = length->as_ArrayLength(); 753 if (al != NULL) { 754 if (al->array() == src) { 755 // it's the length of the source array 756 flags &= ~LIR_OpArrayCopy::length_positive_check; 757 flags &= ~LIR_OpArrayCopy::src_null_check; 758 if (is_constant_zero(src_pos)) 759 flags &= ~LIR_OpArrayCopy::src_range_check; 760 } 761 if (al->array() == dst) { 762 // it's the length of the destination array 763 flags &= ~LIR_OpArrayCopy::length_positive_check; 764 flags &= ~LIR_OpArrayCopy::dst_null_check; 765 if (is_constant_zero(dst_pos)) 766 flags &= ~LIR_OpArrayCopy::dst_range_check; 767 } 768 } 769 if (is_exact) { 770 flags &= ~LIR_OpArrayCopy::type_check; 771 } 772 } 773 774 if (src == dst) { 775 // moving within a single array so no type checks are needed 776 if (flags & LIR_OpArrayCopy::type_check) { 777 flags &= ~LIR_OpArrayCopy::type_check; 778 } 779 } 780 *flagsp = flags; 781 *expected_typep = (ciArrayKlass*)expected_type; 782 } 783 784 785 LIR_Opr LIRGenerator::round_item(LIR_Opr opr) { 786 assert(opr->is_register(), "why spill if item is not register?"); 787 788 if (RoundFPResults && UseSSE < 1 && opr->is_single_fpu()) { 789 LIR_Opr result = new_register(T_FLOAT); 790 set_vreg_flag(result, must_start_in_memory); 791 assert(opr->is_register(), "only a register can be spilled"); 792 assert(opr->value_type()->is_float(), "rounding only for floats available"); 793 __ roundfp(opr, LIR_OprFact::illegalOpr, result); 794 return result; 795 } 796 return opr; 797 } 798 799 800 LIR_Opr LIRGenerator::force_to_spill(LIR_Opr value, BasicType t) { 801 assert(type2size[t] == type2size[value->type()], "size mismatch"); 802 if (!value->is_register()) { 803 // force into a register 804 LIR_Opr r = new_register(value->type()); 805 __ move(value, r); 806 value = r; 807 } 808 809 // create a spill location 810 LIR_Opr tmp = new_register(t); 811 set_vreg_flag(tmp, LIRGenerator::must_start_in_memory); 812 813 // move from register to spill 814 __ move(value, tmp); 815 return tmp; 816 } 817 818 819 void LIRGenerator::profile_branch(If* if_instr, If::Condition cond) { 820 if (if_instr->should_profile()) { 821 ciMethod* method = if_instr->profiled_method(); 822 assert(method != NULL, "method should be set if branch is profiled"); 823 ciMethodData* md = method->method_data(); 824 if (md == NULL) { 825 bailout("out of memory building methodDataOop"); 826 return; 827 } 828 ciProfileData* data = md->bci_to_data(if_instr->profiled_bci()); 829 assert(data != NULL, "must have profiling data"); 830 assert(data->is_BranchData(), "need BranchData for two-way branches"); 831 int taken_count_offset = md->byte_offset_of_slot(data, BranchData::taken_offset()); 832 int not_taken_count_offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset()); 833 LIR_Opr md_reg = new_register(T_OBJECT); 834 __ move(LIR_OprFact::oopConst(md->constant_encoding()), md_reg); 835 LIR_Opr data_offset_reg = new_register(T_INT); 836 __ cmove(lir_cond(cond), 837 LIR_OprFact::intConst(taken_count_offset), 838 LIR_OprFact::intConst(not_taken_count_offset), 839 data_offset_reg); 840 LIR_Opr data_reg = new_register(T_INT); 841 LIR_Address* data_addr = new LIR_Address(md_reg, data_offset_reg, T_INT); 842 __ move(LIR_OprFact::address(data_addr), data_reg); 843 LIR_Address* fake_incr_value = new LIR_Address(data_reg, DataLayout::counter_increment, T_INT); 844 // Use leal instead of add to avoid destroying condition codes on x86 845 __ leal(LIR_OprFact::address(fake_incr_value), data_reg); 846 __ move(data_reg, LIR_OprFact::address(data_addr)); 847 } 848 } 849 850 851 // Phi technique: 852 // This is about passing live values from one basic block to the other. 853 // In code generated with Java it is rather rare that more than one 854 // value is on the stack from one basic block to the other. 855 // We optimize our technique for efficient passing of one value 856 // (of type long, int, double..) but it can be extended. 857 // When entering or leaving a basic block, all registers and all spill 858 // slots are release and empty. We use the released registers 859 // and spill slots to pass the live values from one block 860 // to the other. The topmost value, i.e., the value on TOS of expression 861 // stack is passed in registers. All other values are stored in spilling 862 // area. Every Phi has an index which designates its spill slot 863 // At exit of a basic block, we fill the register(s) and spill slots. 864 // At entry of a basic block, the block_prolog sets up the content of phi nodes 865 // and locks necessary registers and spilling slots. 866 867 868 // move current value to referenced phi function 869 void LIRGenerator::move_to_phi(PhiResolver* resolver, Value cur_val, Value sux_val) { 870 Phi* phi = sux_val->as_Phi(); 871 // cur_val can be null without phi being null in conjunction with inlining 872 if (phi != NULL && cur_val != NULL && cur_val != phi && !phi->is_illegal()) { 873 LIR_Opr operand = cur_val->operand(); 874 if (cur_val->operand()->is_illegal()) { 875 assert(cur_val->as_Constant() != NULL || cur_val->as_Local() != NULL, 876 "these can be produced lazily"); 877 operand = operand_for_instruction(cur_val); 878 } 879 resolver->move(operand, operand_for_instruction(phi)); 880 } 881 } 882 883 884 // Moves all stack values into their PHI position 885 void LIRGenerator::move_to_phi(ValueStack* cur_state) { 886 BlockBegin* bb = block(); 887 if (bb->number_of_sux() == 1) { 888 BlockBegin* sux = bb->sux_at(0); 889 assert(sux->number_of_preds() > 0, "invalid CFG"); 890 891 // a block with only one predecessor never has phi functions 892 if (sux->number_of_preds() > 1) { 893 int max_phis = cur_state->stack_size() + cur_state->locals_size(); 894 PhiResolver resolver(this, _virtual_register_number + max_phis * 2); 895 896 ValueStack* sux_state = sux->state(); 897 Value sux_value; 898 int index; 899 900 for_each_stack_value(sux_state, index, sux_value) { 901 move_to_phi(&resolver, cur_state->stack_at(index), sux_value); 902 } 903 904 // Inlining may cause the local state not to match up, so walk up 905 // the caller state until we get to the same scope as the 906 // successor and then start processing from there. 907 while (cur_state->scope() != sux_state->scope()) { 908 cur_state = cur_state->caller_state(); 909 assert(cur_state != NULL, "scopes don't match up"); 910 } 911 912 for_each_local_value(sux_state, index, sux_value) { 913 move_to_phi(&resolver, cur_state->local_at(index), sux_value); 914 } 915 916 assert(cur_state->caller_state() == sux_state->caller_state(), "caller states must be equal"); 917 } 918 } 919 } 920 921 922 LIR_Opr LIRGenerator::new_register(BasicType type) { 923 int vreg = _virtual_register_number; 924 // add a little fudge factor for the bailout, since the bailout is 925 // only checked periodically. This gives a few extra registers to 926 // hand out before we really run out, which helps us keep from 927 // tripping over assertions. 928 if (vreg + 20 >= LIR_OprDesc::vreg_max) { 929 bailout("out of virtual registers"); 930 if (vreg + 2 >= LIR_OprDesc::vreg_max) { 931 // wrap it around 932 _virtual_register_number = LIR_OprDesc::vreg_base; 933 } 934 } 935 _virtual_register_number += 1; 936 if (type == T_ADDRESS) type = T_INT; 937 return LIR_OprFact::virtual_register(vreg, type); 938 } 939 940 941 // Try to lock using register in hint 942 LIR_Opr LIRGenerator::rlock(Value instr) { 943 return new_register(instr->type()); 944 } 945 946 947 // does an rlock and sets result 948 LIR_Opr LIRGenerator::rlock_result(Value x) { 949 LIR_Opr reg = rlock(x); 950 set_result(x, reg); 951 return reg; 952 } 953 954 955 // does an rlock and sets result 956 LIR_Opr LIRGenerator::rlock_result(Value x, BasicType type) { 957 LIR_Opr reg; 958 switch (type) { 959 case T_BYTE: 960 case T_BOOLEAN: 961 reg = rlock_byte(type); 962 break; 963 default: 964 reg = rlock(x); 965 break; 966 } 967 968 set_result(x, reg); 969 return reg; 970 } 971 972 973 //--------------------------------------------------------------------- 974 ciObject* LIRGenerator::get_jobject_constant(Value value) { 975 ObjectType* oc = value->type()->as_ObjectType(); 976 if (oc) { 977 return oc->constant_value(); 978 } 979 return NULL; 980 } 981 982 983 void LIRGenerator::do_ExceptionObject(ExceptionObject* x) { 984 assert(block()->is_set(BlockBegin::exception_entry_flag), "ExceptionObject only allowed in exception handler block"); 985 assert(block()->next() == x, "ExceptionObject must be first instruction of block"); 986 987 // no moves are created for phi functions at the begin of exception 988 // handlers, so assign operands manually here 989 for_each_phi_fun(block(), phi, 990 operand_for_instruction(phi)); 991 992 LIR_Opr thread_reg = getThreadPointer(); 993 __ move(new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT), 994 exceptionOopOpr()); 995 __ move(LIR_OprFact::oopConst(NULL), 996 new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT)); 997 __ move(LIR_OprFact::oopConst(NULL), 998 new LIR_Address(thread_reg, in_bytes(JavaThread::exception_pc_offset()), T_OBJECT)); 999 1000 LIR_Opr result = new_register(T_OBJECT); 1001 __ move(exceptionOopOpr(), result); 1002 set_result(x, result); 1003 } 1004 1005 1006 //---------------------------------------------------------------------- 1007 //---------------------------------------------------------------------- 1008 //---------------------------------------------------------------------- 1009 //---------------------------------------------------------------------- 1010 // visitor functions 1011 //---------------------------------------------------------------------- 1012 //---------------------------------------------------------------------- 1013 //---------------------------------------------------------------------- 1014 //---------------------------------------------------------------------- 1015 1016 void LIRGenerator::do_Phi(Phi* x) { 1017 // phi functions are never visited directly 1018 ShouldNotReachHere(); 1019 } 1020 1021 1022 // Code for a constant is generated lazily unless the constant is frequently used and can't be inlined. 1023 void LIRGenerator::do_Constant(Constant* x) { 1024 if (x->state() != NULL) { 1025 // Any constant with a ValueStack requires patching so emit the patch here 1026 LIR_Opr reg = rlock_result(x); 1027 CodeEmitInfo* info = state_for(x, x->state()); 1028 __ oop2reg_patch(NULL, reg, info); 1029 } else if (x->use_count() > 1 && !can_inline_as_constant(x)) { 1030 if (!x->is_pinned()) { 1031 // unpinned constants are handled specially so that they can be 1032 // put into registers when they are used multiple times within a 1033 // block. After the block completes their operand will be 1034 // cleared so that other blocks can't refer to that register. 1035 set_result(x, load_constant(x)); 1036 } else { 1037 LIR_Opr res = x->operand(); 1038 if (!res->is_valid()) { 1039 res = LIR_OprFact::value_type(x->type()); 1040 } 1041 if (res->is_constant()) { 1042 LIR_Opr reg = rlock_result(x); 1043 __ move(res, reg); 1044 } else { 1045 set_result(x, res); 1046 } 1047 } 1048 } else { 1049 set_result(x, LIR_OprFact::value_type(x->type())); 1050 } 1051 } 1052 1053 1054 void LIRGenerator::do_Local(Local* x) { 1055 // operand_for_instruction has the side effect of setting the result 1056 // so there's no need to do it here. 1057 operand_for_instruction(x); 1058 } 1059 1060 1061 void LIRGenerator::do_IfInstanceOf(IfInstanceOf* x) { 1062 Unimplemented(); 1063 } 1064 1065 1066 void LIRGenerator::do_Return(Return* x) { 1067 if (compilation()->env()->dtrace_method_probes()) { 1068 BasicTypeList signature; 1069 signature.append(T_INT); // thread 1070 signature.append(T_OBJECT); // methodOop 1071 LIR_OprList* args = new LIR_OprList(); 1072 args->append(getThreadPointer()); 1073 LIR_Opr meth = new_register(T_OBJECT); 1074 __ oop2reg(method()->constant_encoding(), meth); 1075 args->append(meth); 1076 call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), voidType, NULL); 1077 } 1078 1079 if (x->type()->is_void()) { 1080 __ return_op(LIR_OprFact::illegalOpr); 1081 } else { 1082 LIR_Opr reg = result_register_for(x->type(), /*callee=*/true); 1083 LIRItem result(x->result(), this); 1084 1085 result.load_item_force(reg); 1086 __ return_op(result.result()); 1087 } 1088 set_no_result(x); 1089 } 1090 1091 1092 // Example: object.getClass () 1093 void LIRGenerator::do_getClass(Intrinsic* x) { 1094 assert(x->number_of_arguments() == 1, "wrong type"); 1095 1096 LIRItem rcvr(x->argument_at(0), this); 1097 rcvr.load_item(); 1098 LIR_Opr result = rlock_result(x); 1099 1100 // need to perform the null check on the rcvr 1101 CodeEmitInfo* info = NULL; 1102 if (x->needs_null_check()) { 1103 info = state_for(x, x->state()->copy_locks()); 1104 } 1105 __ move(new LIR_Address(rcvr.result(), oopDesc::klass_offset_in_bytes(), T_OBJECT), result, info); 1106 __ move(new LIR_Address(result, Klass::java_mirror_offset_in_bytes() + 1107 klassOopDesc::klass_part_offset_in_bytes(), T_OBJECT), result); 1108 } 1109 1110 1111 // Example: Thread.currentThread() 1112 void LIRGenerator::do_currentThread(Intrinsic* x) { 1113 assert(x->number_of_arguments() == 0, "wrong type"); 1114 LIR_Opr reg = rlock_result(x); 1115 __ load(new LIR_Address(getThreadPointer(), in_bytes(JavaThread::threadObj_offset()), T_OBJECT), reg); 1116 } 1117 1118 1119 void LIRGenerator::do_RegisterFinalizer(Intrinsic* x) { 1120 assert(x->number_of_arguments() == 1, "wrong type"); 1121 LIRItem receiver(x->argument_at(0), this); 1122 1123 receiver.load_item(); 1124 BasicTypeList signature; 1125 signature.append(T_OBJECT); // receiver 1126 LIR_OprList* args = new LIR_OprList(); 1127 args->append(receiver.result()); 1128 CodeEmitInfo* info = state_for(x, x->state()); 1129 call_runtime(&signature, args, 1130 CAST_FROM_FN_PTR(address, Runtime1::entry_for(Runtime1::register_finalizer_id)), 1131 voidType, info); 1132 1133 set_no_result(x); 1134 } 1135 1136 1137 //------------------------local access-------------------------------------- 1138 1139 LIR_Opr LIRGenerator::operand_for_instruction(Instruction* x) { 1140 if (x->operand()->is_illegal()) { 1141 Constant* c = x->as_Constant(); 1142 if (c != NULL) { 1143 x->set_operand(LIR_OprFact::value_type(c->type())); 1144 } else { 1145 assert(x->as_Phi() || x->as_Local() != NULL, "only for Phi and Local"); 1146 // allocate a virtual register for this local or phi 1147 x->set_operand(rlock(x)); 1148 _instruction_for_operand.at_put_grow(x->operand()->vreg_number(), x, NULL); 1149 } 1150 } 1151 return x->operand(); 1152 } 1153 1154 1155 Instruction* LIRGenerator::instruction_for_opr(LIR_Opr opr) { 1156 if (opr->is_virtual()) { 1157 return instruction_for_vreg(opr->vreg_number()); 1158 } 1159 return NULL; 1160 } 1161 1162 1163 Instruction* LIRGenerator::instruction_for_vreg(int reg_num) { 1164 if (reg_num < _instruction_for_operand.length()) { 1165 return _instruction_for_operand.at(reg_num); 1166 } 1167 return NULL; 1168 } 1169 1170 1171 void LIRGenerator::set_vreg_flag(int vreg_num, VregFlag f) { 1172 if (_vreg_flags.size_in_bits() == 0) { 1173 BitMap2D temp(100, num_vreg_flags); 1174 temp.clear(); 1175 _vreg_flags = temp; 1176 } 1177 _vreg_flags.at_put_grow(vreg_num, f, true); 1178 } 1179 1180 bool LIRGenerator::is_vreg_flag_set(int vreg_num, VregFlag f) { 1181 if (!_vreg_flags.is_valid_index(vreg_num, f)) { 1182 return false; 1183 } 1184 return _vreg_flags.at(vreg_num, f); 1185 } 1186 1187 1188 // Block local constant handling. This code is useful for keeping 1189 // unpinned constants and constants which aren't exposed in the IR in 1190 // registers. Unpinned Constant instructions have their operands 1191 // cleared when the block is finished so that other blocks can't end 1192 // up referring to their registers. 1193 1194 LIR_Opr LIRGenerator::load_constant(Constant* x) { 1195 assert(!x->is_pinned(), "only for unpinned constants"); 1196 _unpinned_constants.append(x); 1197 return load_constant(LIR_OprFact::value_type(x->type())->as_constant_ptr()); 1198 } 1199 1200 1201 LIR_Opr LIRGenerator::load_constant(LIR_Const* c) { 1202 BasicType t = c->type(); 1203 for (int i = 0; i < _constants.length(); i++) { 1204 LIR_Const* other = _constants.at(i); 1205 if (t == other->type()) { 1206 switch (t) { 1207 case T_INT: 1208 case T_FLOAT: 1209 if (c->as_jint_bits() != other->as_jint_bits()) continue; 1210 break; 1211 case T_LONG: 1212 case T_DOUBLE: 1213 if (c->as_jint_hi_bits() != other->as_jint_hi_bits()) continue; 1214 if (c->as_jint_lo_bits() != other->as_jint_lo_bits()) continue; 1215 break; 1216 case T_OBJECT: 1217 if (c->as_jobject() != other->as_jobject()) continue; 1218 break; 1219 } 1220 return _reg_for_constants.at(i); 1221 } 1222 } 1223 1224 LIR_Opr result = new_register(t); 1225 __ move((LIR_Opr)c, result); 1226 _constants.append(c); 1227 _reg_for_constants.append(result); 1228 return result; 1229 } 1230 1231 // Various barriers 1232 1233 void LIRGenerator::pre_barrier(LIR_Opr addr_opr, bool patch, CodeEmitInfo* info) { 1234 // Do the pre-write barrier, if any. 1235 switch (_bs->kind()) { 1236 #ifndef SERIALGC 1237 case BarrierSet::G1SATBCT: 1238 case BarrierSet::G1SATBCTLogging: 1239 G1SATBCardTableModRef_pre_barrier(addr_opr, patch, info); 1240 break; 1241 #endif // SERIALGC 1242 case BarrierSet::CardTableModRef: 1243 case BarrierSet::CardTableExtension: 1244 // No pre barriers 1245 break; 1246 case BarrierSet::ModRef: 1247 case BarrierSet::Other: 1248 // No pre barriers 1249 break; 1250 default : 1251 ShouldNotReachHere(); 1252 1253 } 1254 } 1255 1256 void LIRGenerator::post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) { 1257 switch (_bs->kind()) { 1258 #ifndef SERIALGC 1259 case BarrierSet::G1SATBCT: 1260 case BarrierSet::G1SATBCTLogging: 1261 G1SATBCardTableModRef_post_barrier(addr, new_val); 1262 break; 1263 #endif // SERIALGC 1264 case BarrierSet::CardTableModRef: 1265 case BarrierSet::CardTableExtension: 1266 CardTableModRef_post_barrier(addr, new_val); 1267 break; 1268 case BarrierSet::ModRef: 1269 case BarrierSet::Other: 1270 // No post barriers 1271 break; 1272 default : 1273 ShouldNotReachHere(); 1274 } 1275 } 1276 1277 //////////////////////////////////////////////////////////////////////// 1278 #ifndef SERIALGC 1279 1280 void LIRGenerator::G1SATBCardTableModRef_pre_barrier(LIR_Opr addr_opr, bool patch, CodeEmitInfo* info) { 1281 if (G1DisablePreBarrier) return; 1282 1283 // First we test whether marking is in progress. 1284 BasicType flag_type; 1285 if (in_bytes(PtrQueue::byte_width_of_active()) == 4) { 1286 flag_type = T_INT; 1287 } else { 1288 guarantee(in_bytes(PtrQueue::byte_width_of_active()) == 1, 1289 "Assumption"); 1290 flag_type = T_BYTE; 1291 } 1292 LIR_Opr thrd = getThreadPointer(); 1293 LIR_Address* mark_active_flag_addr = 1294 new LIR_Address(thrd, 1295 in_bytes(JavaThread::satb_mark_queue_offset() + 1296 PtrQueue::byte_offset_of_active()), 1297 flag_type); 1298 // Read the marking-in-progress flag. 1299 LIR_Opr flag_val = new_register(T_INT); 1300 __ load(mark_active_flag_addr, flag_val); 1301 1302 LabelObj* start_store = new LabelObj(); 1303 1304 LIR_PatchCode pre_val_patch_code = 1305 patch ? lir_patch_normal : lir_patch_none; 1306 1307 LIR_Opr pre_val = new_register(T_OBJECT); 1308 1309 __ cmp(lir_cond_notEqual, flag_val, LIR_OprFact::intConst(0)); 1310 if (!addr_opr->is_address()) { 1311 assert(addr_opr->is_register(), "must be"); 1312 addr_opr = LIR_OprFact::address(new LIR_Address(addr_opr, 0, T_OBJECT)); 1313 } 1314 CodeStub* slow = new G1PreBarrierStub(addr_opr, pre_val, pre_val_patch_code, 1315 info); 1316 __ branch(lir_cond_notEqual, T_INT, slow); 1317 __ branch_destination(slow->continuation()); 1318 } 1319 1320 void LIRGenerator::G1SATBCardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) { 1321 if (G1DisablePostBarrier) return; 1322 1323 // If the "new_val" is a constant NULL, no barrier is necessary. 1324 if (new_val->is_constant() && 1325 new_val->as_constant_ptr()->as_jobject() == NULL) return; 1326 1327 if (!new_val->is_register()) { 1328 LIR_Opr new_val_reg = new_pointer_register(); 1329 if (new_val->is_constant()) { 1330 __ move(new_val, new_val_reg); 1331 } else { 1332 __ leal(new_val, new_val_reg); 1333 } 1334 new_val = new_val_reg; 1335 } 1336 assert(new_val->is_register(), "must be a register at this point"); 1337 1338 if (addr->is_address()) { 1339 LIR_Address* address = addr->as_address_ptr(); 1340 LIR_Opr ptr = new_pointer_register(); 1341 if (!address->index()->is_valid() && address->disp() == 0) { 1342 __ move(address->base(), ptr); 1343 } else { 1344 assert(address->disp() != max_jint, "lea doesn't support patched addresses!"); 1345 __ leal(addr, ptr); 1346 } 1347 addr = ptr; 1348 } 1349 assert(addr->is_register(), "must be a register at this point"); 1350 1351 LIR_Opr xor_res = new_pointer_register(); 1352 LIR_Opr xor_shift_res = new_pointer_register(); 1353 1354 if (TwoOperandLIRForm ) { 1355 __ move(addr, xor_res); 1356 __ logical_xor(xor_res, new_val, xor_res); 1357 __ move(xor_res, xor_shift_res); 1358 __ unsigned_shift_right(xor_shift_res, 1359 LIR_OprFact::intConst(HeapRegion::LogOfHRGrainBytes), 1360 xor_shift_res, 1361 LIR_OprDesc::illegalOpr()); 1362 } else { 1363 __ logical_xor(addr, new_val, xor_res); 1364 __ unsigned_shift_right(xor_res, 1365 LIR_OprFact::intConst(HeapRegion::LogOfHRGrainBytes), 1366 xor_shift_res, 1367 LIR_OprDesc::illegalOpr()); 1368 } 1369 1370 if (!new_val->is_register()) { 1371 LIR_Opr new_val_reg = new_pointer_register(); 1372 __ leal(new_val, new_val_reg); 1373 new_val = new_val_reg; 1374 } 1375 assert(new_val->is_register(), "must be a register at this point"); 1376 1377 __ cmp(lir_cond_notEqual, xor_shift_res, LIR_OprFact::intptrConst(NULL_WORD)); 1378 1379 CodeStub* slow = new G1PostBarrierStub(addr, new_val); 1380 __ branch(lir_cond_notEqual, T_INT, slow); 1381 __ branch_destination(slow->continuation()); 1382 } 1383 1384 #endif // SERIALGC 1385 //////////////////////////////////////////////////////////////////////// 1386 1387 void LIRGenerator::CardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) { 1388 1389 assert(sizeof(*((CardTableModRefBS*)_bs)->byte_map_base) == sizeof(jbyte), "adjust this code"); 1390 LIR_Const* card_table_base = new LIR_Const(((CardTableModRefBS*)_bs)->byte_map_base); 1391 if (addr->is_address()) { 1392 LIR_Address* address = addr->as_address_ptr(); 1393 LIR_Opr ptr = new_register(T_OBJECT); 1394 if (!address->index()->is_valid() && address->disp() == 0) { 1395 __ move(address->base(), ptr); 1396 } else { 1397 assert(address->disp() != max_jint, "lea doesn't support patched addresses!"); 1398 __ leal(addr, ptr); 1399 } 1400 addr = ptr; 1401 } 1402 assert(addr->is_register(), "must be a register at this point"); 1403 1404 LIR_Opr tmp = new_pointer_register(); 1405 if (TwoOperandLIRForm) { 1406 __ move(addr, tmp); 1407 __ unsigned_shift_right(tmp, CardTableModRefBS::card_shift, tmp); 1408 } else { 1409 __ unsigned_shift_right(addr, CardTableModRefBS::card_shift, tmp); 1410 } 1411 if (can_inline_as_constant(card_table_base)) { 1412 __ move(LIR_OprFact::intConst(0), 1413 new LIR_Address(tmp, card_table_base->as_jint(), T_BYTE)); 1414 } else { 1415 __ move(LIR_OprFact::intConst(0), 1416 new LIR_Address(tmp, load_constant(card_table_base), 1417 T_BYTE)); 1418 } 1419 } 1420 1421 1422 //------------------------field access-------------------------------------- 1423 1424 // Comment copied form templateTable_i486.cpp 1425 // ---------------------------------------------------------------------------- 1426 // Volatile variables demand their effects be made known to all CPU's in 1427 // order. Store buffers on most chips allow reads & writes to reorder; the 1428 // JMM's ReadAfterWrite.java test fails in -Xint mode without some kind of 1429 // memory barrier (i.e., it's not sufficient that the interpreter does not 1430 // reorder volatile references, the hardware also must not reorder them). 1431 // 1432 // According to the new Java Memory Model (JMM): 1433 // (1) All volatiles are serialized wrt to each other. 1434 // ALSO reads & writes act as aquire & release, so: 1435 // (2) A read cannot let unrelated NON-volatile memory refs that happen after 1436 // the read float up to before the read. It's OK for non-volatile memory refs 1437 // that happen before the volatile read to float down below it. 1438 // (3) Similar a volatile write cannot let unrelated NON-volatile memory refs 1439 // that happen BEFORE the write float down to after the write. It's OK for 1440 // non-volatile memory refs that happen after the volatile write to float up 1441 // before it. 1442 // 1443 // We only put in barriers around volatile refs (they are expensive), not 1444 // _between_ memory refs (that would require us to track the flavor of the 1445 // previous memory refs). Requirements (2) and (3) require some barriers 1446 // before volatile stores and after volatile loads. These nearly cover 1447 // requirement (1) but miss the volatile-store-volatile-load case. This final 1448 // case is placed after volatile-stores although it could just as well go 1449 // before volatile-loads. 1450 1451 1452 void LIRGenerator::do_StoreField(StoreField* x) { 1453 bool needs_patching = x->needs_patching(); 1454 bool is_volatile = x->field()->is_volatile(); 1455 BasicType field_type = x->field_type(); 1456 bool is_oop = (field_type == T_ARRAY || field_type == T_OBJECT); 1457 1458 CodeEmitInfo* info = NULL; 1459 if (needs_patching) { 1460 assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access"); 1461 info = state_for(x, x->state_before()); 1462 } else if (x->needs_null_check()) { 1463 NullCheck* nc = x->explicit_null_check(); 1464 if (nc == NULL) { 1465 info = state_for(x, x->lock_stack()); 1466 } else { 1467 info = state_for(nc); 1468 } 1469 } 1470 1471 1472 LIRItem object(x->obj(), this); 1473 LIRItem value(x->value(), this); 1474 1475 object.load_item(); 1476 1477 if (is_volatile || needs_patching) { 1478 // load item if field is volatile (fewer special cases for volatiles) 1479 // load item if field not initialized 1480 // load item if field not constant 1481 // because of code patching we cannot inline constants 1482 if (field_type == T_BYTE || field_type == T_BOOLEAN) { 1483 value.load_byte_item(); 1484 } else { 1485 value.load_item(); 1486 } 1487 } else { 1488 value.load_for_store(field_type); 1489 } 1490 1491 set_no_result(x); 1492 1493 if (PrintNotLoaded && needs_patching) { 1494 tty->print_cr(" ###class not loaded at store_%s bci %d", 1495 x->is_static() ? "static" : "field", x->bci()); 1496 } 1497 1498 if (x->needs_null_check() && 1499 (needs_patching || 1500 MacroAssembler::needs_explicit_null_check(x->offset()))) { 1501 // emit an explicit null check because the offset is too large 1502 __ null_check(object.result(), new CodeEmitInfo(info)); 1503 } 1504 1505 LIR_Address* address; 1506 if (needs_patching) { 1507 // we need to patch the offset in the instruction so don't allow 1508 // generate_address to try to be smart about emitting the -1. 1509 // Otherwise the patching code won't know how to find the 1510 // instruction to patch. 1511 address = new LIR_Address(object.result(), max_jint, field_type); 1512 } else { 1513 address = generate_address(object.result(), x->offset(), field_type); 1514 } 1515 1516 if (is_volatile && os::is_MP()) { 1517 __ membar_release(); 1518 } 1519 1520 if (is_oop) { 1521 // Do the pre-write barrier, if any. 1522 pre_barrier(LIR_OprFact::address(address), 1523 needs_patching, 1524 (info ? new CodeEmitInfo(info) : NULL)); 1525 } 1526 1527 if (is_volatile) { 1528 assert(!needs_patching && x->is_loaded(), 1529 "how do we know it's volatile if it's not loaded"); 1530 volatile_field_store(value.result(), address, info); 1531 } else { 1532 LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none; 1533 __ store(value.result(), address, info, patch_code); 1534 } 1535 1536 if (is_oop) { 1537 // Store to object so mark the card of the header 1538 post_barrier(object.result(), value.result()); 1539 } 1540 1541 if (is_volatile && os::is_MP()) { 1542 __ membar(); 1543 } 1544 } 1545 1546 1547 void LIRGenerator::do_LoadField(LoadField* x) { 1548 bool needs_patching = x->needs_patching(); 1549 bool is_volatile = x->field()->is_volatile(); 1550 BasicType field_type = x->field_type(); 1551 1552 CodeEmitInfo* info = NULL; 1553 if (needs_patching) { 1554 assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access"); 1555 info = state_for(x, x->state_before()); 1556 } else if (x->needs_null_check()) { 1557 NullCheck* nc = x->explicit_null_check(); 1558 if (nc == NULL) { 1559 info = state_for(x, x->lock_stack()); 1560 } else { 1561 info = state_for(nc); 1562 } 1563 } 1564 1565 LIRItem object(x->obj(), this); 1566 1567 object.load_item(); 1568 1569 if (PrintNotLoaded && needs_patching) { 1570 tty->print_cr(" ###class not loaded at load_%s bci %d", 1571 x->is_static() ? "static" : "field", x->bci()); 1572 } 1573 1574 if (x->needs_null_check() && 1575 (needs_patching || 1576 MacroAssembler::needs_explicit_null_check(x->offset()))) { 1577 // emit an explicit null check because the offset is too large 1578 __ null_check(object.result(), new CodeEmitInfo(info)); 1579 } 1580 1581 LIR_Opr reg = rlock_result(x, field_type); 1582 LIR_Address* address; 1583 if (needs_patching) { 1584 // we need to patch the offset in the instruction so don't allow 1585 // generate_address to try to be smart about emitting the -1. 1586 // Otherwise the patching code won't know how to find the 1587 // instruction to patch. 1588 address = new LIR_Address(object.result(), max_jint, field_type); 1589 } else { 1590 address = generate_address(object.result(), x->offset(), field_type); 1591 } 1592 1593 if (is_volatile) { 1594 assert(!needs_patching && x->is_loaded(), 1595 "how do we know it's volatile if it's not loaded"); 1596 volatile_field_load(address, reg, info); 1597 } else { 1598 LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none; 1599 __ load(address, reg, info, patch_code); 1600 } 1601 1602 if (is_volatile && os::is_MP()) { 1603 __ membar_acquire(); 1604 } 1605 } 1606 1607 1608 //------------------------java.nio.Buffer.checkIndex------------------------ 1609 1610 // int java.nio.Buffer.checkIndex(int) 1611 void LIRGenerator::do_NIOCheckIndex(Intrinsic* x) { 1612 // NOTE: by the time we are in checkIndex() we are guaranteed that 1613 // the buffer is non-null (because checkIndex is package-private and 1614 // only called from within other methods in the buffer). 1615 assert(x->number_of_arguments() == 2, "wrong type"); 1616 LIRItem buf (x->argument_at(0), this); 1617 LIRItem index(x->argument_at(1), this); 1618 buf.load_item(); 1619 index.load_item(); 1620 1621 LIR_Opr result = rlock_result(x); 1622 if (GenerateRangeChecks) { 1623 CodeEmitInfo* info = state_for(x); 1624 CodeStub* stub = new RangeCheckStub(info, index.result(), true); 1625 if (index.result()->is_constant()) { 1626 cmp_mem_int(lir_cond_belowEqual, buf.result(), java_nio_Buffer::limit_offset(), index.result()->as_jint(), info); 1627 __ branch(lir_cond_belowEqual, T_INT, stub); 1628 } else { 1629 cmp_reg_mem(lir_cond_aboveEqual, index.result(), buf.result(), 1630 java_nio_Buffer::limit_offset(), T_INT, info); 1631 __ branch(lir_cond_aboveEqual, T_INT, stub); 1632 } 1633 __ move(index.result(), result); 1634 } else { 1635 // Just load the index into the result register 1636 __ move(index.result(), result); 1637 } 1638 } 1639 1640 1641 //------------------------array access-------------------------------------- 1642 1643 1644 void LIRGenerator::do_ArrayLength(ArrayLength* x) { 1645 LIRItem array(x->array(), this); 1646 array.load_item(); 1647 LIR_Opr reg = rlock_result(x); 1648 1649 CodeEmitInfo* info = NULL; 1650 if (x->needs_null_check()) { 1651 NullCheck* nc = x->explicit_null_check(); 1652 if (nc == NULL) { 1653 info = state_for(x); 1654 } else { 1655 info = state_for(nc); 1656 } 1657 } 1658 __ load(new LIR_Address(array.result(), arrayOopDesc::length_offset_in_bytes(), T_INT), reg, info, lir_patch_none); 1659 } 1660 1661 1662 void LIRGenerator::do_LoadIndexed(LoadIndexed* x) { 1663 bool use_length = x->length() != NULL; 1664 LIRItem array(x->array(), this); 1665 LIRItem index(x->index(), this); 1666 LIRItem length(this); 1667 bool needs_range_check = true; 1668 1669 if (use_length) { 1670 needs_range_check = x->compute_needs_range_check(); 1671 if (needs_range_check) { 1672 length.set_instruction(x->length()); 1673 length.load_item(); 1674 } 1675 } 1676 1677 array.load_item(); 1678 if (index.is_constant() && can_inline_as_constant(x->index())) { 1679 // let it be a constant 1680 index.dont_load_item(); 1681 } else { 1682 index.load_item(); 1683 } 1684 1685 CodeEmitInfo* range_check_info = state_for(x); 1686 CodeEmitInfo* null_check_info = NULL; 1687 if (x->needs_null_check()) { 1688 NullCheck* nc = x->explicit_null_check(); 1689 if (nc != NULL) { 1690 null_check_info = state_for(nc); 1691 } else { 1692 null_check_info = range_check_info; 1693 } 1694 } 1695 1696 // emit array address setup early so it schedules better 1697 LIR_Address* array_addr = emit_array_address(array.result(), index.result(), x->elt_type(), false); 1698 1699 if (GenerateRangeChecks && needs_range_check) { 1700 if (use_length) { 1701 // TODO: use a (modified) version of array_range_check that does not require a 1702 // constant length to be loaded to a register 1703 __ cmp(lir_cond_belowEqual, length.result(), index.result()); 1704 __ branch(lir_cond_belowEqual, T_INT, new RangeCheckStub(range_check_info, index.result())); 1705 } else { 1706 array_range_check(array.result(), index.result(), null_check_info, range_check_info); 1707 // The range check performs the null check, so clear it out for the load 1708 null_check_info = NULL; 1709 } 1710 } 1711 1712 __ move(array_addr, rlock_result(x, x->elt_type()), null_check_info); 1713 } 1714 1715 1716 void LIRGenerator::do_NullCheck(NullCheck* x) { 1717 if (x->can_trap()) { 1718 LIRItem value(x->obj(), this); 1719 value.load_item(); 1720 CodeEmitInfo* info = state_for(x); 1721 __ null_check(value.result(), info); 1722 } 1723 } 1724 1725 1726 void LIRGenerator::do_Throw(Throw* x) { 1727 LIRItem exception(x->exception(), this); 1728 exception.load_item(); 1729 set_no_result(x); 1730 LIR_Opr exception_opr = exception.result(); 1731 CodeEmitInfo* info = state_for(x, x->state()); 1732 1733 #ifndef PRODUCT 1734 if (PrintC1Statistics) { 1735 increment_counter(Runtime1::throw_count_address()); 1736 } 1737 #endif 1738 1739 // check if the instruction has an xhandler in any of the nested scopes 1740 bool unwind = false; 1741 if (info->exception_handlers()->length() == 0) { 1742 // this throw is not inside an xhandler 1743 unwind = true; 1744 } else { 1745 // get some idea of the throw type 1746 bool type_is_exact = true; 1747 ciType* throw_type = x->exception()->exact_type(); 1748 if (throw_type == NULL) { 1749 type_is_exact = false; 1750 throw_type = x->exception()->declared_type(); 1751 } 1752 if (throw_type != NULL && throw_type->is_instance_klass()) { 1753 ciInstanceKlass* throw_klass = (ciInstanceKlass*)throw_type; 1754 unwind = !x->exception_handlers()->could_catch(throw_klass, type_is_exact); 1755 } 1756 } 1757 1758 // do null check before moving exception oop into fixed register 1759 // to avoid a fixed interval with an oop during the null check. 1760 // Use a copy of the CodeEmitInfo because debug information is 1761 // different for null_check and throw. 1762 if (GenerateCompilerNullChecks && 1763 (x->exception()->as_NewInstance() == NULL && x->exception()->as_ExceptionObject() == NULL)) { 1764 // if the exception object wasn't created using new then it might be null. 1765 __ null_check(exception_opr, new CodeEmitInfo(info, true)); 1766 } 1767 1768 if (compilation()->env()->jvmti_can_post_on_exceptions() && 1769 !block()->is_set(BlockBegin::default_exception_handler_flag)) { 1770 // we need to go through the exception lookup path to get JVMTI 1771 // notification done 1772 unwind = false; 1773 } 1774 1775 assert(!block()->is_set(BlockBegin::default_exception_handler_flag) || unwind, 1776 "should be no more handlers to dispatch to"); 1777 1778 if (compilation()->env()->dtrace_method_probes() && 1779 block()->is_set(BlockBegin::default_exception_handler_flag)) { 1780 // notify that this frame is unwinding 1781 BasicTypeList signature; 1782 signature.append(T_INT); // thread 1783 signature.append(T_OBJECT); // methodOop 1784 LIR_OprList* args = new LIR_OprList(); 1785 args->append(getThreadPointer()); 1786 LIR_Opr meth = new_register(T_OBJECT); 1787 __ oop2reg(method()->constant_encoding(), meth); 1788 args->append(meth); 1789 call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), voidType, NULL); 1790 } 1791 1792 // move exception oop into fixed register 1793 __ move(exception_opr, exceptionOopOpr()); 1794 1795 if (unwind) { 1796 __ unwind_exception(LIR_OprFact::illegalOpr, exceptionOopOpr(), info); 1797 } else { 1798 __ throw_exception(exceptionPcOpr(), exceptionOopOpr(), info); 1799 } 1800 } 1801 1802 1803 void LIRGenerator::do_RoundFP(RoundFP* x) { 1804 LIRItem input(x->input(), this); 1805 input.load_item(); 1806 LIR_Opr input_opr = input.result(); 1807 assert(input_opr->is_register(), "why round if value is not in a register?"); 1808 assert(input_opr->is_single_fpu() || input_opr->is_double_fpu(), "input should be floating-point value"); 1809 if (input_opr->is_single_fpu()) { 1810 set_result(x, round_item(input_opr)); // This code path not currently taken 1811 } else { 1812 LIR_Opr result = new_register(T_DOUBLE); 1813 set_vreg_flag(result, must_start_in_memory); 1814 __ roundfp(input_opr, LIR_OprFact::illegalOpr, result); 1815 set_result(x, result); 1816 } 1817 } 1818 1819 void LIRGenerator::do_UnsafeGetRaw(UnsafeGetRaw* x) { 1820 LIRItem base(x->base(), this); 1821 LIRItem idx(this); 1822 1823 base.load_item(); 1824 if (x->has_index()) { 1825 idx.set_instruction(x->index()); 1826 idx.load_nonconstant(); 1827 } 1828 1829 LIR_Opr reg = rlock_result(x, x->basic_type()); 1830 1831 int log2_scale = 0; 1832 if (x->has_index()) { 1833 assert(x->index()->type()->tag() == intTag, "should not find non-int index"); 1834 log2_scale = x->log2_scale(); 1835 } 1836 1837 assert(!x->has_index() || idx.value() == x->index(), "should match"); 1838 1839 LIR_Opr base_op = base.result(); 1840 #ifndef _LP64 1841 if (x->base()->type()->tag() == longTag) { 1842 base_op = new_register(T_INT); 1843 __ convert(Bytecodes::_l2i, base.result(), base_op); 1844 } else { 1845 assert(x->base()->type()->tag() == intTag, "must be"); 1846 } 1847 #endif 1848 1849 BasicType dst_type = x->basic_type(); 1850 LIR_Opr index_op = idx.result(); 1851 1852 LIR_Address* addr; 1853 if (index_op->is_constant()) { 1854 assert(log2_scale == 0, "must not have a scale"); 1855 addr = new LIR_Address(base_op, index_op->as_jint(), dst_type); 1856 } else { 1857 #ifdef X86 1858 #ifdef _LP64 1859 if (!index_op->is_illegal() && index_op->type() == T_INT) { 1860 LIR_Opr tmp = new_pointer_register(); 1861 __ convert(Bytecodes::_i2l, index_op, tmp); 1862 index_op = tmp; 1863 } 1864 #endif 1865 addr = new LIR_Address(base_op, index_op, LIR_Address::Scale(log2_scale), 0, dst_type); 1866 #else 1867 if (index_op->is_illegal() || log2_scale == 0) { 1868 #ifdef _LP64 1869 if (!index_op->is_illegal() && index_op->type() == T_INT) { 1870 LIR_Opr tmp = new_pointer_register(); 1871 __ convert(Bytecodes::_i2l, index_op, tmp); 1872 index_op = tmp; 1873 } 1874 #endif 1875 addr = new LIR_Address(base_op, index_op, dst_type); 1876 } else { 1877 LIR_Opr tmp = new_pointer_register(); 1878 __ shift_left(index_op, log2_scale, tmp); 1879 addr = new LIR_Address(base_op, tmp, dst_type); 1880 } 1881 #endif 1882 } 1883 1884 if (x->may_be_unaligned() && (dst_type == T_LONG || dst_type == T_DOUBLE)) { 1885 __ unaligned_move(addr, reg); 1886 } else { 1887 __ move(addr, reg); 1888 } 1889 } 1890 1891 1892 void LIRGenerator::do_UnsafePutRaw(UnsafePutRaw* x) { 1893 int log2_scale = 0; 1894 BasicType type = x->basic_type(); 1895 1896 if (x->has_index()) { 1897 assert(x->index()->type()->tag() == intTag, "should not find non-int index"); 1898 log2_scale = x->log2_scale(); 1899 } 1900 1901 LIRItem base(x->base(), this); 1902 LIRItem value(x->value(), this); 1903 LIRItem idx(this); 1904 1905 base.load_item(); 1906 if (x->has_index()) { 1907 idx.set_instruction(x->index()); 1908 idx.load_item(); 1909 } 1910 1911 if (type == T_BYTE || type == T_BOOLEAN) { 1912 value.load_byte_item(); 1913 } else { 1914 value.load_item(); 1915 } 1916 1917 set_no_result(x); 1918 1919 LIR_Opr base_op = base.result(); 1920 #ifndef _LP64 1921 if (x->base()->type()->tag() == longTag) { 1922 base_op = new_register(T_INT); 1923 __ convert(Bytecodes::_l2i, base.result(), base_op); 1924 } else { 1925 assert(x->base()->type()->tag() == intTag, "must be"); 1926 } 1927 #endif 1928 1929 LIR_Opr index_op = idx.result(); 1930 if (log2_scale != 0) { 1931 // temporary fix (platform dependent code without shift on Intel would be better) 1932 index_op = new_pointer_register(); 1933 #ifdef _LP64 1934 if(idx.result()->type() == T_INT) { 1935 __ convert(Bytecodes::_i2l, idx.result(), index_op); 1936 } else { 1937 #endif 1938 __ move(idx.result(), index_op); 1939 #ifdef _LP64 1940 } 1941 #endif 1942 __ shift_left(index_op, log2_scale, index_op); 1943 } 1944 #ifdef _LP64 1945 else if(!index_op->is_illegal() && index_op->type() == T_INT) { 1946 LIR_Opr tmp = new_pointer_register(); 1947 __ convert(Bytecodes::_i2l, index_op, tmp); 1948 index_op = tmp; 1949 } 1950 #endif 1951 1952 LIR_Address* addr = new LIR_Address(base_op, index_op, x->basic_type()); 1953 __ move(value.result(), addr); 1954 } 1955 1956 1957 void LIRGenerator::do_UnsafeGetObject(UnsafeGetObject* x) { 1958 BasicType type = x->basic_type(); 1959 LIRItem src(x->object(), this); 1960 LIRItem off(x->offset(), this); 1961 1962 off.load_item(); 1963 src.load_item(); 1964 1965 LIR_Opr reg = reg = rlock_result(x, x->basic_type()); 1966 1967 if (x->is_volatile() && os::is_MP()) __ membar_acquire(); 1968 get_Object_unsafe(reg, src.result(), off.result(), type, x->is_volatile()); 1969 if (x->is_volatile() && os::is_MP()) __ membar(); 1970 } 1971 1972 1973 void LIRGenerator::do_UnsafePutObject(UnsafePutObject* x) { 1974 BasicType type = x->basic_type(); 1975 LIRItem src(x->object(), this); 1976 LIRItem off(x->offset(), this); 1977 LIRItem data(x->value(), this); 1978 1979 src.load_item(); 1980 if (type == T_BOOLEAN || type == T_BYTE) { 1981 data.load_byte_item(); 1982 } else { 1983 data.load_item(); 1984 } 1985 off.load_item(); 1986 1987 set_no_result(x); 1988 1989 if (x->is_volatile() && os::is_MP()) __ membar_release(); 1990 put_Object_unsafe(src.result(), off.result(), data.result(), type, x->is_volatile()); 1991 } 1992 1993 1994 void LIRGenerator::do_UnsafePrefetch(UnsafePrefetch* x, bool is_store) { 1995 LIRItem src(x->object(), this); 1996 LIRItem off(x->offset(), this); 1997 1998 src.load_item(); 1999 if (off.is_constant() && can_inline_as_constant(x->offset())) { 2000 // let it be a constant 2001 off.dont_load_item(); 2002 } else { 2003 off.load_item(); 2004 } 2005 2006 set_no_result(x); 2007 2008 LIR_Address* addr = generate_address(src.result(), off.result(), 0, 0, T_BYTE); 2009 __ prefetch(addr, is_store); 2010 } 2011 2012 2013 void LIRGenerator::do_UnsafePrefetchRead(UnsafePrefetchRead* x) { 2014 do_UnsafePrefetch(x, false); 2015 } 2016 2017 2018 void LIRGenerator::do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) { 2019 do_UnsafePrefetch(x, true); 2020 } 2021 2022 2023 void LIRGenerator::do_SwitchRanges(SwitchRangeArray* x, LIR_Opr value, BlockBegin* default_sux) { 2024 int lng = x->length(); 2025 2026 for (int i = 0; i < lng; i++) { 2027 SwitchRange* one_range = x->at(i); 2028 int low_key = one_range->low_key(); 2029 int high_key = one_range->high_key(); 2030 BlockBegin* dest = one_range->sux(); 2031 if (low_key == high_key) { 2032 __ cmp(lir_cond_equal, value, low_key); 2033 __ branch(lir_cond_equal, T_INT, dest); 2034 } else if (high_key - low_key == 1) { 2035 __ cmp(lir_cond_equal, value, low_key); 2036 __ branch(lir_cond_equal, T_INT, dest); 2037 __ cmp(lir_cond_equal, value, high_key); 2038 __ branch(lir_cond_equal, T_INT, dest); 2039 } else { 2040 LabelObj* L = new LabelObj(); 2041 __ cmp(lir_cond_less, value, low_key); 2042 __ branch(lir_cond_less, L->label()); 2043 __ cmp(lir_cond_lessEqual, value, high_key); 2044 __ branch(lir_cond_lessEqual, T_INT, dest); 2045 __ branch_destination(L->label()); 2046 } 2047 } 2048 __ jump(default_sux); 2049 } 2050 2051 2052 SwitchRangeArray* LIRGenerator::create_lookup_ranges(TableSwitch* x) { 2053 SwitchRangeList* res = new SwitchRangeList(); 2054 int len = x->length(); 2055 if (len > 0) { 2056 BlockBegin* sux = x->sux_at(0); 2057 int key = x->lo_key(); 2058 BlockBegin* default_sux = x->default_sux(); 2059 SwitchRange* range = new SwitchRange(key, sux); 2060 for (int i = 0; i < len; i++, key++) { 2061 BlockBegin* new_sux = x->sux_at(i); 2062 if (sux == new_sux) { 2063 // still in same range 2064 range->set_high_key(key); 2065 } else { 2066 // skip tests which explicitly dispatch to the default 2067 if (sux != default_sux) { 2068 res->append(range); 2069 } 2070 range = new SwitchRange(key, new_sux); 2071 } 2072 sux = new_sux; 2073 } 2074 if (res->length() == 0 || res->last() != range) res->append(range); 2075 } 2076 return res; 2077 } 2078 2079 2080 // we expect the keys to be sorted by increasing value 2081 SwitchRangeArray* LIRGenerator::create_lookup_ranges(LookupSwitch* x) { 2082 SwitchRangeList* res = new SwitchRangeList(); 2083 int len = x->length(); 2084 if (len > 0) { 2085 BlockBegin* default_sux = x->default_sux(); 2086 int key = x->key_at(0); 2087 BlockBegin* sux = x->sux_at(0); 2088 SwitchRange* range = new SwitchRange(key, sux); 2089 for (int i = 1; i < len; i++) { 2090 int new_key = x->key_at(i); 2091 BlockBegin* new_sux = x->sux_at(i); 2092 if (key+1 == new_key && sux == new_sux) { 2093 // still in same range 2094 range->set_high_key(new_key); 2095 } else { 2096 // skip tests which explicitly dispatch to the default 2097 if (range->sux() != default_sux) { 2098 res->append(range); 2099 } 2100 range = new SwitchRange(new_key, new_sux); 2101 } 2102 key = new_key; 2103 sux = new_sux; 2104 } 2105 if (res->length() == 0 || res->last() != range) res->append(range); 2106 } 2107 return res; 2108 } 2109 2110 2111 void LIRGenerator::do_TableSwitch(TableSwitch* x) { 2112 LIRItem tag(x->tag(), this); 2113 tag.load_item(); 2114 set_no_result(x); 2115 2116 if (x->is_safepoint()) { 2117 __ safepoint(safepoint_poll_register(), state_for(x, x->state_before())); 2118 } 2119 2120 // move values into phi locations 2121 move_to_phi(x->state()); 2122 2123 int lo_key = x->lo_key(); 2124 int hi_key = x->hi_key(); 2125 int len = x->length(); 2126 CodeEmitInfo* info = state_for(x, x->state()); 2127 LIR_Opr value = tag.result(); 2128 if (UseTableRanges) { 2129 do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux()); 2130 } else { 2131 for (int i = 0; i < len; i++) { 2132 __ cmp(lir_cond_equal, value, i + lo_key); 2133 __ branch(lir_cond_equal, T_INT, x->sux_at(i)); 2134 } 2135 __ jump(x->default_sux()); 2136 } 2137 } 2138 2139 2140 void LIRGenerator::do_LookupSwitch(LookupSwitch* x) { 2141 LIRItem tag(x->tag(), this); 2142 tag.load_item(); 2143 set_no_result(x); 2144 2145 if (x->is_safepoint()) { 2146 __ safepoint(safepoint_poll_register(), state_for(x, x->state_before())); 2147 } 2148 2149 // move values into phi locations 2150 move_to_phi(x->state()); 2151 2152 LIR_Opr value = tag.result(); 2153 if (UseTableRanges) { 2154 do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux()); 2155 } else { 2156 int len = x->length(); 2157 for (int i = 0; i < len; i++) { 2158 __ cmp(lir_cond_equal, value, x->key_at(i)); 2159 __ branch(lir_cond_equal, T_INT, x->sux_at(i)); 2160 } 2161 __ jump(x->default_sux()); 2162 } 2163 } 2164 2165 2166 void LIRGenerator::do_Goto(Goto* x) { 2167 set_no_result(x); 2168 2169 if (block()->next()->as_OsrEntry()) { 2170 // need to free up storage used for OSR entry point 2171 LIR_Opr osrBuffer = block()->next()->operand(); 2172 BasicTypeList signature; 2173 signature.append(T_INT); 2174 CallingConvention* cc = frame_map()->c_calling_convention(&signature); 2175 __ move(osrBuffer, cc->args()->at(0)); 2176 __ call_runtime_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end), 2177 getThreadTemp(), LIR_OprFact::illegalOpr, cc->args()); 2178 } 2179 2180 if (x->is_safepoint()) { 2181 ValueStack* state = x->state_before() ? x->state_before() : x->state(); 2182 2183 // increment backedge counter if needed 2184 increment_backedge_counter(state_for(x, state)); 2185 2186 CodeEmitInfo* safepoint_info = state_for(x, state); 2187 __ safepoint(safepoint_poll_register(), safepoint_info); 2188 } 2189 2190 // emit phi-instruction move after safepoint since this simplifies 2191 // describing the state as the safepoint. 2192 move_to_phi(x->state()); 2193 2194 __ jump(x->default_sux()); 2195 } 2196 2197 2198 void LIRGenerator::do_Base(Base* x) { 2199 __ std_entry(LIR_OprFact::illegalOpr); 2200 // Emit moves from physical registers / stack slots to virtual registers 2201 CallingConvention* args = compilation()->frame_map()->incoming_arguments(); 2202 IRScope* irScope = compilation()->hir()->top_scope(); 2203 int java_index = 0; 2204 for (int i = 0; i < args->length(); i++) { 2205 LIR_Opr src = args->at(i); 2206 assert(!src->is_illegal(), "check"); 2207 BasicType t = src->type(); 2208 2209 // Types which are smaller than int are passed as int, so 2210 // correct the type which passed. 2211 switch (t) { 2212 case T_BYTE: 2213 case T_BOOLEAN: 2214 case T_SHORT: 2215 case T_CHAR: 2216 t = T_INT; 2217 break; 2218 } 2219 2220 LIR_Opr dest = new_register(t); 2221 __ move(src, dest); 2222 2223 // Assign new location to Local instruction for this local 2224 Local* local = x->state()->local_at(java_index)->as_Local(); 2225 assert(local != NULL, "Locals for incoming arguments must have been created"); 2226 assert(as_ValueType(t)->tag() == local->type()->tag(), "check"); 2227 local->set_operand(dest); 2228 _instruction_for_operand.at_put_grow(dest->vreg_number(), local, NULL); 2229 java_index += type2size[t]; 2230 } 2231 2232 if (compilation()->env()->dtrace_method_probes()) { 2233 BasicTypeList signature; 2234 signature.append(T_INT); // thread 2235 signature.append(T_OBJECT); // methodOop 2236 LIR_OprList* args = new LIR_OprList(); 2237 args->append(getThreadPointer()); 2238 LIR_Opr meth = new_register(T_OBJECT); 2239 __ oop2reg(method()->constant_encoding(), meth); 2240 args->append(meth); 2241 call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), voidType, NULL); 2242 } 2243 2244 if (method()->is_synchronized()) { 2245 LIR_Opr obj; 2246 if (method()->is_static()) { 2247 obj = new_register(T_OBJECT); 2248 __ oop2reg(method()->holder()->java_mirror()->constant_encoding(), obj); 2249 } else { 2250 Local* receiver = x->state()->local_at(0)->as_Local(); 2251 assert(receiver != NULL, "must already exist"); 2252 obj = receiver->operand(); 2253 } 2254 assert(obj->is_valid(), "must be valid"); 2255 2256 if (method()->is_synchronized() && GenerateSynchronizationCode) { 2257 LIR_Opr lock = new_register(T_INT); 2258 __ load_stack_address_monitor(0, lock); 2259 2260 CodeEmitInfo* info = new CodeEmitInfo(SynchronizationEntryBCI, scope()->start()->state(), NULL); 2261 CodeStub* slow_path = new MonitorEnterStub(obj, lock, info); 2262 2263 // receiver is guaranteed non-NULL so don't need CodeEmitInfo 2264 __ lock_object(syncTempOpr(), obj, lock, new_register(T_OBJECT), slow_path, NULL); 2265 } 2266 } 2267 2268 // increment invocation counters if needed 2269 increment_invocation_counter(new CodeEmitInfo(0, scope()->start()->state(), NULL)); 2270 2271 // all blocks with a successor must end with an unconditional jump 2272 // to the successor even if they are consecutive 2273 __ jump(x->default_sux()); 2274 } 2275 2276 2277 void LIRGenerator::do_OsrEntry(OsrEntry* x) { 2278 // construct our frame and model the production of incoming pointer 2279 // to the OSR buffer. 2280 __ osr_entry(LIR_Assembler::osrBufferPointer()); 2281 LIR_Opr result = rlock_result(x); 2282 __ move(LIR_Assembler::osrBufferPointer(), result); 2283 } 2284 2285 2286 void LIRGenerator::invoke_load_arguments(Invoke* x, LIRItemList* args, const LIR_OprList* arg_list) { 2287 int i = (x->has_receiver() || x->is_invokedynamic()) ? 1 : 0; 2288 for (; i < args->length(); i++) { 2289 LIRItem* param = args->at(i); 2290 LIR_Opr loc = arg_list->at(i); 2291 if (loc->is_register()) { 2292 param->load_item_force(loc); 2293 } else { 2294 LIR_Address* addr = loc->as_address_ptr(); 2295 param->load_for_store(addr->type()); 2296 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 2297 __ unaligned_move(param->result(), addr); 2298 } else { 2299 __ move(param->result(), addr); 2300 } 2301 } 2302 } 2303 2304 if (x->has_receiver()) { 2305 LIRItem* receiver = args->at(0); 2306 LIR_Opr loc = arg_list->at(0); 2307 if (loc->is_register()) { 2308 receiver->load_item_force(loc); 2309 } else { 2310 assert(loc->is_address(), "just checking"); 2311 receiver->load_for_store(T_OBJECT); 2312 __ move(receiver->result(), loc); 2313 } 2314 } 2315 } 2316 2317 2318 // Visits all arguments, returns appropriate items without loading them 2319 LIRItemList* LIRGenerator::invoke_visit_arguments(Invoke* x) { 2320 LIRItemList* argument_items = new LIRItemList(); 2321 if (x->has_receiver()) { 2322 LIRItem* receiver = new LIRItem(x->receiver(), this); 2323 argument_items->append(receiver); 2324 } 2325 if (x->is_invokedynamic()) { 2326 // Insert a dummy for the synthetic MethodHandle argument. 2327 argument_items->append(NULL); 2328 } 2329 int idx = x->has_receiver() ? 1 : 0; 2330 for (int i = 0; i < x->number_of_arguments(); i++) { 2331 LIRItem* param = new LIRItem(x->argument_at(i), this); 2332 argument_items->append(param); 2333 idx += (param->type()->is_double_word() ? 2 : 1); 2334 } 2335 return argument_items; 2336 } 2337 2338 2339 // The invoke with receiver has following phases: 2340 // a) traverse and load/lock receiver; 2341 // b) traverse all arguments -> item-array (invoke_visit_argument) 2342 // c) push receiver on stack 2343 // d) load each of the items and push on stack 2344 // e) unlock receiver 2345 // f) move receiver into receiver-register %o0 2346 // g) lock result registers and emit call operation 2347 // 2348 // Before issuing a call, we must spill-save all values on stack 2349 // that are in caller-save register. "spill-save" moves thos registers 2350 // either in a free callee-save register or spills them if no free 2351 // callee save register is available. 2352 // 2353 // The problem is where to invoke spill-save. 2354 // - if invoked between e) and f), we may lock callee save 2355 // register in "spill-save" that destroys the receiver register 2356 // before f) is executed 2357 // - if we rearange the f) to be earlier, by loading %o0, it 2358 // may destroy a value on the stack that is currently in %o0 2359 // and is waiting to be spilled 2360 // - if we keep the receiver locked while doing spill-save, 2361 // we cannot spill it as it is spill-locked 2362 // 2363 void LIRGenerator::do_Invoke(Invoke* x) { 2364 CallingConvention* cc = frame_map()->java_calling_convention(x->signature(), true); 2365 2366 LIR_OprList* arg_list = cc->args(); 2367 LIRItemList* args = invoke_visit_arguments(x); 2368 LIR_Opr receiver = LIR_OprFact::illegalOpr; 2369 2370 // setup result register 2371 LIR_Opr result_register = LIR_OprFact::illegalOpr; 2372 if (x->type() != voidType) { 2373 result_register = result_register_for(x->type()); 2374 } 2375 2376 CodeEmitInfo* info = state_for(x, x->state()); 2377 2378 // invokedynamics can deoptimize. 2379 CodeEmitInfo* deopt_info = x->is_invokedynamic() ? state_for(x, x->state_before()) : NULL; 2380 2381 invoke_load_arguments(x, args, arg_list); 2382 2383 if (x->has_receiver()) { 2384 args->at(0)->load_item_force(LIR_Assembler::receiverOpr()); 2385 receiver = args->at(0)->result(); 2386 } 2387 2388 // emit invoke code 2389 bool optimized = x->target_is_loaded() && x->target_is_final(); 2390 assert(receiver->is_illegal() || receiver->is_equal(LIR_Assembler::receiverOpr()), "must match"); 2391 2392 // JSR 292 2393 // Preserve the SP over MethodHandle call sites. 2394 ciMethod* target = x->target(); 2395 if (target->is_method_handle_invoke()) { 2396 info->set_is_method_handle_invoke(true); 2397 __ move(FrameMap::stack_pointer(), FrameMap::method_handle_invoke_SP_save_opr()); 2398 } 2399 2400 switch (x->code()) { 2401 case Bytecodes::_invokestatic: 2402 __ call_static(target, result_register, 2403 SharedRuntime::get_resolve_static_call_stub(), 2404 arg_list, info); 2405 break; 2406 case Bytecodes::_invokespecial: 2407 case Bytecodes::_invokevirtual: 2408 case Bytecodes::_invokeinterface: 2409 // for final target we still produce an inline cache, in order 2410 // to be able to call mixed mode 2411 if (x->code() == Bytecodes::_invokespecial || optimized) { 2412 __ call_opt_virtual(target, receiver, result_register, 2413 SharedRuntime::get_resolve_opt_virtual_call_stub(), 2414 arg_list, info); 2415 } else if (x->vtable_index() < 0) { 2416 __ call_icvirtual(target, receiver, result_register, 2417 SharedRuntime::get_resolve_virtual_call_stub(), 2418 arg_list, info); 2419 } else { 2420 int entry_offset = instanceKlass::vtable_start_offset() + x->vtable_index() * vtableEntry::size(); 2421 int vtable_offset = entry_offset * wordSize + vtableEntry::method_offset_in_bytes(); 2422 __ call_virtual(target, receiver, result_register, vtable_offset, arg_list, info); 2423 } 2424 break; 2425 case Bytecodes::_invokedynamic: { 2426 ciBytecodeStream bcs(x->scope()->method()); 2427 bcs.force_bci(x->bci()); 2428 assert(bcs.cur_bc() == Bytecodes::_invokedynamic, "wrong stream"); 2429 ciCPCache* cpcache = bcs.get_cpcache(); 2430 2431 // Get CallSite offset from constant pool cache pointer. 2432 int index = bcs.get_method_index(); 2433 size_t call_site_offset = cpcache->get_f1_offset(index); 2434 2435 // If this invokedynamic call site hasn't been executed yet in 2436 // the interpreter, the CallSite object in the constant pool 2437 // cache is still null and we need to deoptimize. 2438 if (cpcache->is_f1_null_at(index)) { 2439 // Cannot re-use same xhandlers for multiple CodeEmitInfos, so 2440 // clone all handlers. This is handled transparently in other 2441 // places by the CodeEmitInfo cloning logic but is handled 2442 // specially here because a stub isn't being used. 2443 x->set_exception_handlers(new XHandlers(x->exception_handlers())); 2444 2445 DeoptimizeStub* deopt_stub = new DeoptimizeStub(deopt_info); 2446 __ jump(deopt_stub); 2447 } 2448 2449 // Use the receiver register for the synthetic MethodHandle 2450 // argument. 2451 receiver = LIR_Assembler::receiverOpr(); 2452 LIR_Opr tmp = new_register(objectType); 2453 2454 // Load CallSite object from constant pool cache. 2455 __ oop2reg(cpcache->constant_encoding(), tmp); 2456 __ load(new LIR_Address(tmp, call_site_offset, T_OBJECT), tmp); 2457 2458 // Load target MethodHandle from CallSite object. 2459 __ load(new LIR_Address(tmp, java_dyn_CallSite::target_offset_in_bytes(), T_OBJECT), receiver); 2460 2461 __ call_dynamic(target, receiver, result_register, 2462 SharedRuntime::get_resolve_opt_virtual_call_stub(), 2463 arg_list, info); 2464 break; 2465 } 2466 default: 2467 ShouldNotReachHere(); 2468 break; 2469 } 2470 2471 // JSR 292 2472 // Restore the SP after MethodHandle call sites. 2473 if (target->is_method_handle_invoke()) { 2474 __ move(FrameMap::method_handle_invoke_SP_save_opr(), FrameMap::stack_pointer()); 2475 } 2476 2477 if (x->type()->is_float() || x->type()->is_double()) { 2478 // Force rounding of results from non-strictfp when in strictfp 2479 // scope (or when we don't know the strictness of the callee, to 2480 // be safe.) 2481 if (method()->is_strict()) { 2482 if (!x->target_is_loaded() || !x->target_is_strictfp()) { 2483 result_register = round_item(result_register); 2484 } 2485 } 2486 } 2487 2488 if (result_register->is_valid()) { 2489 LIR_Opr result = rlock_result(x); 2490 __ move(result_register, result); 2491 } 2492 } 2493 2494 2495 void LIRGenerator::do_FPIntrinsics(Intrinsic* x) { 2496 assert(x->number_of_arguments() == 1, "wrong type"); 2497 LIRItem value (x->argument_at(0), this); 2498 LIR_Opr reg = rlock_result(x); 2499 value.load_item(); 2500 LIR_Opr tmp = force_to_spill(value.result(), as_BasicType(x->type())); 2501 __ move(tmp, reg); 2502 } 2503 2504 2505 2506 // Code for : x->x() {x->cond()} x->y() ? x->tval() : x->fval() 2507 void LIRGenerator::do_IfOp(IfOp* x) { 2508 #ifdef ASSERT 2509 { 2510 ValueTag xtag = x->x()->type()->tag(); 2511 ValueTag ttag = x->tval()->type()->tag(); 2512 assert(xtag == intTag || xtag == objectTag, "cannot handle others"); 2513 assert(ttag == addressTag || ttag == intTag || ttag == objectTag || ttag == longTag, "cannot handle others"); 2514 assert(ttag == x->fval()->type()->tag(), "cannot handle others"); 2515 } 2516 #endif 2517 2518 LIRItem left(x->x(), this); 2519 LIRItem right(x->y(), this); 2520 left.load_item(); 2521 if (can_inline_as_constant(right.value())) { 2522 right.dont_load_item(); 2523 } else { 2524 right.load_item(); 2525 } 2526 2527 LIRItem t_val(x->tval(), this); 2528 LIRItem f_val(x->fval(), this); 2529 t_val.dont_load_item(); 2530 f_val.dont_load_item(); 2531 LIR_Opr reg = rlock_result(x); 2532 2533 __ cmp(lir_cond(x->cond()), left.result(), right.result()); 2534 __ cmove(lir_cond(x->cond()), t_val.result(), f_val.result(), reg); 2535 } 2536 2537 2538 void LIRGenerator::do_Intrinsic(Intrinsic* x) { 2539 switch (x->id()) { 2540 case vmIntrinsics::_intBitsToFloat : 2541 case vmIntrinsics::_doubleToRawLongBits : 2542 case vmIntrinsics::_longBitsToDouble : 2543 case vmIntrinsics::_floatToRawIntBits : { 2544 do_FPIntrinsics(x); 2545 break; 2546 } 2547 2548 case vmIntrinsics::_currentTimeMillis: { 2549 assert(x->number_of_arguments() == 0, "wrong type"); 2550 LIR_Opr reg = result_register_for(x->type()); 2551 __ call_runtime_leaf(CAST_FROM_FN_PTR(address, os::javaTimeMillis), getThreadTemp(), 2552 reg, new LIR_OprList()); 2553 LIR_Opr result = rlock_result(x); 2554 __ move(reg, result); 2555 break; 2556 } 2557 2558 case vmIntrinsics::_nanoTime: { 2559 assert(x->number_of_arguments() == 0, "wrong type"); 2560 LIR_Opr reg = result_register_for(x->type()); 2561 __ call_runtime_leaf(CAST_FROM_FN_PTR(address, os::javaTimeNanos), getThreadTemp(), 2562 reg, new LIR_OprList()); 2563 LIR_Opr result = rlock_result(x); 2564 __ move(reg, result); 2565 break; 2566 } 2567 2568 case vmIntrinsics::_Object_init: do_RegisterFinalizer(x); break; 2569 case vmIntrinsics::_getClass: do_getClass(x); break; 2570 case vmIntrinsics::_currentThread: do_currentThread(x); break; 2571 2572 case vmIntrinsics::_dlog: // fall through 2573 case vmIntrinsics::_dlog10: // fall through 2574 case vmIntrinsics::_dabs: // fall through 2575 case vmIntrinsics::_dsqrt: // fall through 2576 case vmIntrinsics::_dtan: // fall through 2577 case vmIntrinsics::_dsin : // fall through 2578 case vmIntrinsics::_dcos : do_MathIntrinsic(x); break; 2579 case vmIntrinsics::_arraycopy: do_ArrayCopy(x); break; 2580 2581 // java.nio.Buffer.checkIndex 2582 case vmIntrinsics::_checkIndex: do_NIOCheckIndex(x); break; 2583 2584 case vmIntrinsics::_compareAndSwapObject: 2585 do_CompareAndSwap(x, objectType); 2586 break; 2587 case vmIntrinsics::_compareAndSwapInt: 2588 do_CompareAndSwap(x, intType); 2589 break; 2590 case vmIntrinsics::_compareAndSwapLong: 2591 do_CompareAndSwap(x, longType); 2592 break; 2593 2594 // sun.misc.AtomicLongCSImpl.attemptUpdate 2595 case vmIntrinsics::_attemptUpdate: 2596 do_AttemptUpdate(x); 2597 break; 2598 2599 default: ShouldNotReachHere(); break; 2600 } 2601 } 2602 2603 2604 void LIRGenerator::do_ProfileCall(ProfileCall* x) { 2605 // Need recv in a temporary register so it interferes with the other temporaries 2606 LIR_Opr recv = LIR_OprFact::illegalOpr; 2607 LIR_Opr mdo = new_register(T_OBJECT); 2608 LIR_Opr tmp = new_register(T_INT); 2609 if (x->recv() != NULL) { 2610 LIRItem value(x->recv(), this); 2611 value.load_item(); 2612 recv = new_register(T_OBJECT); 2613 __ move(value.result(), recv); 2614 } 2615 __ profile_call(x->method(), x->bci_of_invoke(), mdo, recv, tmp, x->known_holder()); 2616 } 2617 2618 2619 void LIRGenerator::do_ProfileCounter(ProfileCounter* x) { 2620 LIRItem mdo(x->mdo(), this); 2621 mdo.load_item(); 2622 2623 increment_counter(new LIR_Address(mdo.result(), x->offset(), T_INT), x->increment()); 2624 } 2625 2626 2627 LIR_Opr LIRGenerator::call_runtime(Value arg1, address entry, ValueType* result_type, CodeEmitInfo* info) { 2628 LIRItemList args(1); 2629 LIRItem value(arg1, this); 2630 args.append(&value); 2631 BasicTypeList signature; 2632 signature.append(as_BasicType(arg1->type())); 2633 2634 return call_runtime(&signature, &args, entry, result_type, info); 2635 } 2636 2637 2638 LIR_Opr LIRGenerator::call_runtime(Value arg1, Value arg2, address entry, ValueType* result_type, CodeEmitInfo* info) { 2639 LIRItemList args(2); 2640 LIRItem value1(arg1, this); 2641 LIRItem value2(arg2, this); 2642 args.append(&value1); 2643 args.append(&value2); 2644 BasicTypeList signature; 2645 signature.append(as_BasicType(arg1->type())); 2646 signature.append(as_BasicType(arg2->type())); 2647 2648 return call_runtime(&signature, &args, entry, result_type, info); 2649 } 2650 2651 2652 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIR_OprList* args, 2653 address entry, ValueType* result_type, CodeEmitInfo* info) { 2654 // get a result register 2655 LIR_Opr phys_reg = LIR_OprFact::illegalOpr; 2656 LIR_Opr result = LIR_OprFact::illegalOpr; 2657 if (result_type->tag() != voidTag) { 2658 result = new_register(result_type); 2659 phys_reg = result_register_for(result_type); 2660 } 2661 2662 // move the arguments into the correct location 2663 CallingConvention* cc = frame_map()->c_calling_convention(signature); 2664 assert(cc->length() == args->length(), "argument mismatch"); 2665 for (int i = 0; i < args->length(); i++) { 2666 LIR_Opr arg = args->at(i); 2667 LIR_Opr loc = cc->at(i); 2668 if (loc->is_register()) { 2669 __ move(arg, loc); 2670 } else { 2671 LIR_Address* addr = loc->as_address_ptr(); 2672 // if (!can_store_as_constant(arg)) { 2673 // LIR_Opr tmp = new_register(arg->type()); 2674 // __ move(arg, tmp); 2675 // arg = tmp; 2676 // } 2677 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 2678 __ unaligned_move(arg, addr); 2679 } else { 2680 __ move(arg, addr); 2681 } 2682 } 2683 } 2684 2685 if (info) { 2686 __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info); 2687 } else { 2688 __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args()); 2689 } 2690 if (result->is_valid()) { 2691 __ move(phys_reg, result); 2692 } 2693 return result; 2694 } 2695 2696 2697 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIRItemList* args, 2698 address entry, ValueType* result_type, CodeEmitInfo* info) { 2699 // get a result register 2700 LIR_Opr phys_reg = LIR_OprFact::illegalOpr; 2701 LIR_Opr result = LIR_OprFact::illegalOpr; 2702 if (result_type->tag() != voidTag) { 2703 result = new_register(result_type); 2704 phys_reg = result_register_for(result_type); 2705 } 2706 2707 // move the arguments into the correct location 2708 CallingConvention* cc = frame_map()->c_calling_convention(signature); 2709 2710 assert(cc->length() == args->length(), "argument mismatch"); 2711 for (int i = 0; i < args->length(); i++) { 2712 LIRItem* arg = args->at(i); 2713 LIR_Opr loc = cc->at(i); 2714 if (loc->is_register()) { 2715 arg->load_item_force(loc); 2716 } else { 2717 LIR_Address* addr = loc->as_address_ptr(); 2718 arg->load_for_store(addr->type()); 2719 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 2720 __ unaligned_move(arg->result(), addr); 2721 } else { 2722 __ move(arg->result(), addr); 2723 } 2724 } 2725 } 2726 2727 if (info) { 2728 __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info); 2729 } else { 2730 __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args()); 2731 } 2732 if (result->is_valid()) { 2733 __ move(phys_reg, result); 2734 } 2735 return result; 2736 } 2737 2738 2739 2740 void LIRGenerator::increment_invocation_counter(CodeEmitInfo* info, bool backedge) { 2741 #ifdef TIERED 2742 if (_compilation->env()->comp_level() == CompLevel_fast_compile && 2743 (method()->code_size() >= Tier1BytecodeLimit || backedge)) { 2744 int limit = InvocationCounter::Tier1InvocationLimit; 2745 int offset = in_bytes(methodOopDesc::invocation_counter_offset() + 2746 InvocationCounter::counter_offset()); 2747 if (backedge) { 2748 limit = InvocationCounter::Tier1BackEdgeLimit; 2749 offset = in_bytes(methodOopDesc::backedge_counter_offset() + 2750 InvocationCounter::counter_offset()); 2751 } 2752 2753 LIR_Opr meth = new_register(T_OBJECT); 2754 __ oop2reg(method()->constant_encoding(), meth); 2755 LIR_Opr result = increment_and_return_counter(meth, offset, InvocationCounter::count_increment); 2756 __ cmp(lir_cond_aboveEqual, result, LIR_OprFact::intConst(limit)); 2757 CodeStub* overflow = new CounterOverflowStub(info, info->bci()); 2758 __ branch(lir_cond_aboveEqual, T_INT, overflow); 2759 __ branch_destination(overflow->continuation()); 2760 } 2761 #endif 2762 }