1 /* 2 * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "c1/c1_Defs.hpp" 27 #include "c1/c1_Compilation.hpp" 28 #include "c1/c1_FrameMap.hpp" 29 #include "c1/c1_Instruction.hpp" 30 #include "c1/c1_LIRAssembler.hpp" 31 #include "c1/c1_LIRGenerator.hpp" 32 #include "c1/c1_ValueStack.hpp" 33 #include "ci/ciArrayKlass.hpp" 34 #include "ci/ciInstance.hpp" 35 #include "ci/ciObjArray.hpp" 36 #include "runtime/sharedRuntime.hpp" 37 #include "runtime/stubRoutines.hpp" 38 #include "utilities/bitMap.inline.hpp" 39 #include "utilities/macros.hpp" 40 #if INCLUDE_ALL_GCS 41 #include "gc_implementation/g1/heapRegion.hpp" 42 #endif // INCLUDE_ALL_GCS 43 44 #ifdef ASSERT 45 #define __ gen()->lir(__FILE__, __LINE__)-> 46 #else 47 #define __ gen()->lir()-> 48 #endif 49 50 #ifndef PATCHED_ADDR 51 #define PATCHED_ADDR (max_jint) 52 #endif 53 54 void PhiResolverState::reset(int max_vregs) { 55 // Initialize array sizes 56 _virtual_operands.at_put_grow(max_vregs - 1, NULL, NULL); 57 _virtual_operands.trunc_to(0); 58 _other_operands.at_put_grow(max_vregs - 1, NULL, NULL); 59 _other_operands.trunc_to(0); 60 _vreg_table.at_put_grow(max_vregs - 1, NULL, NULL); 61 _vreg_table.trunc_to(0); 62 } 63 64 65 66 //-------------------------------------------------------------- 67 // PhiResolver 68 69 // Resolves cycles: 70 // 71 // r1 := r2 becomes temp := r1 72 // r2 := r1 r1 := r2 73 // r2 := temp 74 // and orders moves: 75 // 76 // r2 := r3 becomes r1 := r2 77 // r1 := r2 r2 := r3 78 79 PhiResolver::PhiResolver(LIRGenerator* gen, int max_vregs) 80 : _gen(gen) 81 , _state(gen->resolver_state()) 82 , _temp(LIR_OprFact::illegalOpr) 83 { 84 // reinitialize the shared state arrays 85 _state.reset(max_vregs); 86 } 87 88 89 void PhiResolver::emit_move(LIR_Opr src, LIR_Opr dest) { 90 assert(src->is_valid(), ""); 91 assert(dest->is_valid(), ""); 92 __ move(src, dest); 93 } 94 95 96 void PhiResolver::move_temp_to(LIR_Opr dest) { 97 assert(_temp->is_valid(), ""); 98 emit_move(_temp, dest); 99 NOT_PRODUCT(_temp = LIR_OprFact::illegalOpr); 100 } 101 102 103 void PhiResolver::move_to_temp(LIR_Opr src) { 104 assert(_temp->is_illegal(), ""); 105 _temp = _gen->new_register(src->type()); 106 emit_move(src, _temp); 107 } 108 109 110 // Traverse assignment graph in depth first order and generate moves in post order 111 // ie. two assignments: b := c, a := b start with node c: 112 // Call graph: move(NULL, c) -> move(c, b) -> move(b, a) 113 // Generates moves in this order: move b to a and move c to b 114 // ie. cycle a := b, b := a start with node a 115 // Call graph: move(NULL, a) -> move(a, b) -> move(b, a) 116 // Generates moves in this order: move b to temp, move a to b, move temp to a 117 void PhiResolver::move(ResolveNode* src, ResolveNode* dest) { 118 if (!dest->visited()) { 119 dest->set_visited(); 120 for (int i = dest->no_of_destinations()-1; i >= 0; i --) { 121 move(dest, dest->destination_at(i)); 122 } 123 } else if (!dest->start_node()) { 124 // cylce in graph detected 125 assert(_loop == NULL, "only one loop valid!"); 126 _loop = dest; 127 move_to_temp(src->operand()); 128 return; 129 } // else dest is a start node 130 131 if (!dest->assigned()) { 132 if (_loop == dest) { 133 move_temp_to(dest->operand()); 134 dest->set_assigned(); 135 } else if (src != NULL) { 136 emit_move(src->operand(), dest->operand()); 137 dest->set_assigned(); 138 } 139 } 140 } 141 142 143 PhiResolver::~PhiResolver() { 144 int i; 145 // resolve any cycles in moves from and to virtual registers 146 for (i = virtual_operands().length() - 1; i >= 0; i --) { 147 ResolveNode* node = virtual_operands()[i]; 148 if (!node->visited()) { 149 _loop = NULL; 150 move(NULL, node); 151 node->set_start_node(); 152 assert(_temp->is_illegal(), "move_temp_to() call missing"); 153 } 154 } 155 156 // generate move for move from non virtual register to abitrary destination 157 for (i = other_operands().length() - 1; i >= 0; i --) { 158 ResolveNode* node = other_operands()[i]; 159 for (int j = node->no_of_destinations() - 1; j >= 0; j --) { 160 emit_move(node->operand(), node->destination_at(j)->operand()); 161 } 162 } 163 } 164 165 166 ResolveNode* PhiResolver::create_node(LIR_Opr opr, bool source) { 167 ResolveNode* node; 168 if (opr->is_virtual()) { 169 int vreg_num = opr->vreg_number(); 170 node = vreg_table().at_grow(vreg_num, NULL); 171 assert(node == NULL || node->operand() == opr, ""); 172 if (node == NULL) { 173 node = new ResolveNode(opr); 174 vreg_table()[vreg_num] = node; 175 } 176 // Make sure that all virtual operands show up in the list when 177 // they are used as the source of a move. 178 if (source && !virtual_operands().contains(node)) { 179 virtual_operands().append(node); 180 } 181 } else { 182 assert(source, ""); 183 node = new ResolveNode(opr); 184 other_operands().append(node); 185 } 186 return node; 187 } 188 189 190 void PhiResolver::move(LIR_Opr src, LIR_Opr dest) { 191 assert(dest->is_virtual(), ""); 192 // tty->print("move "); src->print(); tty->print(" to "); dest->print(); tty->cr(); 193 assert(src->is_valid(), ""); 194 assert(dest->is_valid(), ""); 195 ResolveNode* source = source_node(src); 196 source->append(destination_node(dest)); 197 } 198 199 200 //-------------------------------------------------------------- 201 // LIRItem 202 203 void LIRItem::set_result(LIR_Opr opr) { 204 assert(value()->operand()->is_illegal() || value()->operand()->is_constant(), "operand should never change"); 205 value()->set_operand(opr); 206 207 if (opr->is_virtual()) { 208 _gen->_instruction_for_operand.at_put_grow(opr->vreg_number(), value(), NULL); 209 } 210 211 _result = opr; 212 } 213 214 void LIRItem::load_item() { 215 if (result()->is_illegal()) { 216 // update the items result 217 _result = value()->operand(); 218 } 219 if (!result()->is_register()) { 220 LIR_Opr reg = _gen->new_register(value()->type()); 221 __ move(result(), reg); 222 if (result()->is_constant()) { 223 _result = reg; 224 } else { 225 set_result(reg); 226 } 227 } 228 } 229 230 231 void LIRItem::load_for_store(BasicType type) { 232 if (_gen->can_store_as_constant(value(), type)) { 233 _result = value()->operand(); 234 if (!_result->is_constant()) { 235 _result = LIR_OprFact::value_type(value()->type()); 236 } 237 } else if (type == T_BYTE || type == T_BOOLEAN) { 238 load_byte_item(); 239 } else { 240 load_item(); 241 } 242 } 243 244 void LIRItem::load_item_force(LIR_Opr reg) { 245 LIR_Opr r = result(); 246 if (r != reg) { 247 #if !defined(ARM) && !defined(E500V2) 248 if (r->type() != reg->type()) { 249 // moves between different types need an intervening spill slot 250 r = _gen->force_to_spill(r, reg->type()); 251 } 252 #endif 253 __ move(r, reg); 254 _result = reg; 255 } 256 } 257 258 ciObject* LIRItem::get_jobject_constant() const { 259 ObjectType* oc = type()->as_ObjectType(); 260 if (oc) { 261 return oc->constant_value(); 262 } 263 return NULL; 264 } 265 266 267 jint LIRItem::get_jint_constant() const { 268 assert(is_constant() && value() != NULL, ""); 269 assert(type()->as_IntConstant() != NULL, "type check"); 270 return type()->as_IntConstant()->value(); 271 } 272 273 274 jint LIRItem::get_address_constant() const { 275 assert(is_constant() && value() != NULL, ""); 276 assert(type()->as_AddressConstant() != NULL, "type check"); 277 return type()->as_AddressConstant()->value(); 278 } 279 280 281 jfloat LIRItem::get_jfloat_constant() const { 282 assert(is_constant() && value() != NULL, ""); 283 assert(type()->as_FloatConstant() != NULL, "type check"); 284 return type()->as_FloatConstant()->value(); 285 } 286 287 288 jdouble LIRItem::get_jdouble_constant() const { 289 assert(is_constant() && value() != NULL, ""); 290 assert(type()->as_DoubleConstant() != NULL, "type check"); 291 return type()->as_DoubleConstant()->value(); 292 } 293 294 295 jlong LIRItem::get_jlong_constant() const { 296 assert(is_constant() && value() != NULL, ""); 297 assert(type()->as_LongConstant() != NULL, "type check"); 298 return type()->as_LongConstant()->value(); 299 } 300 301 302 303 //-------------------------------------------------------------- 304 305 306 void LIRGenerator::init() { 307 _bs = Universe::heap()->barrier_set(); 308 } 309 310 311 void LIRGenerator::block_do_prolog(BlockBegin* block) { 312 #ifndef PRODUCT 313 if (PrintIRWithLIR) { 314 block->print(); 315 } 316 #endif 317 318 // set up the list of LIR instructions 319 assert(block->lir() == NULL, "LIR list already computed for this block"); 320 _lir = new LIR_List(compilation(), block); 321 block->set_lir(_lir); 322 323 __ branch_destination(block->label()); 324 325 if (LIRTraceExecution && 326 Compilation::current()->hir()->start()->block_id() != block->block_id() && 327 !block->is_set(BlockBegin::exception_entry_flag)) { 328 assert(block->lir()->instructions_list()->length() == 1, "should come right after br_dst"); 329 trace_block_entry(block); 330 } 331 } 332 333 334 void LIRGenerator::block_do_epilog(BlockBegin* block) { 335 #ifndef PRODUCT 336 if (PrintIRWithLIR) { 337 tty->cr(); 338 } 339 #endif 340 341 // LIR_Opr for unpinned constants shouldn't be referenced by other 342 // blocks so clear them out after processing the block. 343 for (int i = 0; i < _unpinned_constants.length(); i++) { 344 _unpinned_constants.at(i)->clear_operand(); 345 } 346 _unpinned_constants.trunc_to(0); 347 348 // clear our any registers for other local constants 349 _constants.trunc_to(0); 350 _reg_for_constants.trunc_to(0); 351 } 352 353 354 void LIRGenerator::block_do(BlockBegin* block) { 355 CHECK_BAILOUT(); 356 357 block_do_prolog(block); 358 set_block(block); 359 360 for (Instruction* instr = block; instr != NULL; instr = instr->next()) { 361 if (instr->is_pinned()) do_root(instr); 362 } 363 364 set_block(NULL); 365 block_do_epilog(block); 366 } 367 368 369 //-------------------------LIRGenerator----------------------------- 370 371 // This is where the tree-walk starts; instr must be root; 372 void LIRGenerator::do_root(Value instr) { 373 CHECK_BAILOUT(); 374 375 InstructionMark im(compilation(), instr); 376 377 assert(instr->is_pinned(), "use only with roots"); 378 assert(instr->subst() == instr, "shouldn't have missed substitution"); 379 380 instr->visit(this); 381 382 assert(!instr->has_uses() || instr->operand()->is_valid() || 383 instr->as_Constant() != NULL || bailed_out(), "invalid item set"); 384 } 385 386 387 // This is called for each node in tree; the walk stops if a root is reached 388 void LIRGenerator::walk(Value instr) { 389 InstructionMark im(compilation(), instr); 390 //stop walk when encounter a root 391 if (instr->is_pinned() && instr->as_Phi() == NULL || instr->operand()->is_valid()) { 392 assert(instr->operand() != LIR_OprFact::illegalOpr || instr->as_Constant() != NULL, "this root has not yet been visited"); 393 } else { 394 assert(instr->subst() == instr, "shouldn't have missed substitution"); 395 instr->visit(this); 396 // assert(instr->use_count() > 0 || instr->as_Phi() != NULL, "leaf instruction must have a use"); 397 } 398 } 399 400 401 CodeEmitInfo* LIRGenerator::state_for(Instruction* x, ValueStack* state, bool ignore_xhandler) { 402 assert(state != NULL, "state must be defined"); 403 404 #ifndef PRODUCT 405 state->verify(); 406 #endif 407 408 ValueStack* s = state; 409 for_each_state(s) { 410 if (s->kind() == ValueStack::EmptyExceptionState) { 411 assert(s->stack_size() == 0 && s->locals_size() == 0 && (s->locks_size() == 0 || s->locks_size() == 1), "state must be empty"); 412 continue; 413 } 414 415 int index; 416 Value value; 417 for_each_stack_value(s, index, value) { 418 assert(value->subst() == value, "missed substitution"); 419 if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) { 420 walk(value); 421 assert(value->operand()->is_valid(), "must be evaluated now"); 422 } 423 } 424 425 int bci = s->bci(); 426 IRScope* scope = s->scope(); 427 ciMethod* method = scope->method(); 428 429 MethodLivenessResult liveness = method->liveness_at_bci(bci); 430 if (bci == SynchronizationEntryBCI) { 431 if (x->as_ExceptionObject() || x->as_Throw()) { 432 // all locals are dead on exit from the synthetic unlocker 433 liveness.clear(); 434 } else { 435 assert(x->as_MonitorEnter() || x->as_ProfileInvoke(), "only other cases are MonitorEnter and ProfileInvoke"); 436 } 437 } 438 if (!liveness.is_valid()) { 439 // Degenerate or breakpointed method. 440 bailout("Degenerate or breakpointed method"); 441 } else { 442 assert((int)liveness.size() == s->locals_size(), "error in use of liveness"); 443 for_each_local_value(s, index, value) { 444 assert(value->subst() == value, "missed substition"); 445 if (liveness.at(index) && !value->type()->is_illegal()) { 446 if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) { 447 walk(value); 448 assert(value->operand()->is_valid(), "must be evaluated now"); 449 } 450 } else { 451 // NULL out this local so that linear scan can assume that all non-NULL values are live. 452 s->invalidate_local(index); 453 } 454 } 455 } 456 } 457 458 return new CodeEmitInfo(state, ignore_xhandler ? NULL : x->exception_handlers(), x->check_flag(Instruction::DeoptimizeOnException)); 459 } 460 461 462 CodeEmitInfo* LIRGenerator::state_for(Instruction* x) { 463 return state_for(x, x->exception_state()); 464 } 465 466 467 void LIRGenerator::klass2reg_with_patching(LIR_Opr r, ciMetadata* obj, CodeEmitInfo* info, bool need_resolve) { 468 /* C2 relies on constant pool entries being resolved (ciTypeFlow), so if TieredCompilation 469 * is active and the class hasn't yet been resolved we need to emit a patch that resolves 470 * the class. */ 471 if ((TieredCompilation && need_resolve) || !obj->is_loaded() || PatchALot) { 472 assert(info != NULL, "info must be set if class is not loaded"); 473 __ klass2reg_patch(NULL, r, info); 474 } else { 475 // no patching needed 476 __ metadata2reg(obj->constant_encoding(), r); 477 } 478 } 479 480 481 void LIRGenerator::array_range_check(LIR_Opr array, LIR_Opr index, 482 CodeEmitInfo* null_check_info, CodeEmitInfo* range_check_info) { 483 CodeStub* stub = new RangeCheckStub(range_check_info, index); 484 if (index->is_constant()) { 485 cmp_mem_int(lir_cond_belowEqual, array, arrayOopDesc::length_offset_in_bytes(), 486 index->as_jint(), null_check_info); 487 __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch 488 } else { 489 cmp_reg_mem(lir_cond_aboveEqual, index, array, 490 arrayOopDesc::length_offset_in_bytes(), T_INT, null_check_info); 491 __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch 492 } 493 } 494 495 496 void LIRGenerator::nio_range_check(LIR_Opr buffer, LIR_Opr index, LIR_Opr result, CodeEmitInfo* info) { 497 CodeStub* stub = new RangeCheckStub(info, index, true); 498 if (index->is_constant()) { 499 cmp_mem_int(lir_cond_belowEqual, buffer, java_nio_Buffer::limit_offset(), index->as_jint(), info); 500 __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch 501 } else { 502 cmp_reg_mem(lir_cond_aboveEqual, index, buffer, 503 java_nio_Buffer::limit_offset(), T_INT, info); 504 __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch 505 } 506 __ move(index, result); 507 } 508 509 510 511 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) { 512 LIR_Opr result_op = result; 513 LIR_Opr left_op = left; 514 LIR_Opr right_op = right; 515 516 if (TwoOperandLIRForm && left_op != result_op) { 517 assert(right_op != result_op, "malformed"); 518 __ move(left_op, result_op); 519 left_op = result_op; 520 } 521 522 switch(code) { 523 case Bytecodes::_dadd: 524 case Bytecodes::_fadd: 525 case Bytecodes::_ladd: 526 case Bytecodes::_iadd: __ add(left_op, right_op, result_op); break; 527 case Bytecodes::_fmul: 528 case Bytecodes::_lmul: __ mul(left_op, right_op, result_op); break; 529 530 case Bytecodes::_dmul: 531 { 532 if (is_strictfp) { 533 __ mul_strictfp(left_op, right_op, result_op, tmp_op); break; 534 } else { 535 __ mul(left_op, right_op, result_op); break; 536 } 537 } 538 break; 539 540 case Bytecodes::_imul: 541 { 542 bool did_strength_reduce = false; 543 544 if (right->is_constant()) { 545 int c = right->as_jint(); 546 if (is_power_of_2(c)) { 547 // do not need tmp here 548 __ shift_left(left_op, exact_log2(c), result_op); 549 did_strength_reduce = true; 550 } else { 551 did_strength_reduce = strength_reduce_multiply(left_op, c, result_op, tmp_op); 552 } 553 } 554 // we couldn't strength reduce so just emit the multiply 555 if (!did_strength_reduce) { 556 __ mul(left_op, right_op, result_op); 557 } 558 } 559 break; 560 561 case Bytecodes::_dsub: 562 case Bytecodes::_fsub: 563 case Bytecodes::_lsub: 564 case Bytecodes::_isub: __ sub(left_op, right_op, result_op); break; 565 566 case Bytecodes::_fdiv: __ div (left_op, right_op, result_op); break; 567 // ldiv and lrem are implemented with a direct runtime call 568 569 case Bytecodes::_ddiv: 570 { 571 if (is_strictfp) { 572 __ div_strictfp (left_op, right_op, result_op, tmp_op); break; 573 } else { 574 __ div (left_op, right_op, result_op); break; 575 } 576 } 577 break; 578 579 case Bytecodes::_drem: 580 case Bytecodes::_frem: __ rem (left_op, right_op, result_op); break; 581 582 default: ShouldNotReachHere(); 583 } 584 } 585 586 587 void LIRGenerator::arithmetic_op_int(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, LIR_Opr tmp) { 588 arithmetic_op(code, result, left, right, false, tmp); 589 } 590 591 592 void LIRGenerator::arithmetic_op_long(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, CodeEmitInfo* info) { 593 arithmetic_op(code, result, left, right, false, LIR_OprFact::illegalOpr, info); 594 } 595 596 597 void LIRGenerator::arithmetic_op_fpu(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp) { 598 arithmetic_op(code, result, left, right, is_strictfp, tmp); 599 } 600 601 602 void LIRGenerator::shift_op(Bytecodes::Code code, LIR_Opr result_op, LIR_Opr value, LIR_Opr count, LIR_Opr tmp) { 603 if (TwoOperandLIRForm && value != result_op) { 604 assert(count != result_op, "malformed"); 605 __ move(value, result_op); 606 value = result_op; 607 } 608 609 assert(count->is_constant() || count->is_register(), "must be"); 610 switch(code) { 611 case Bytecodes::_ishl: 612 case Bytecodes::_lshl: __ shift_left(value, count, result_op, tmp); break; 613 case Bytecodes::_ishr: 614 case Bytecodes::_lshr: __ shift_right(value, count, result_op, tmp); break; 615 case Bytecodes::_iushr: 616 case Bytecodes::_lushr: __ unsigned_shift_right(value, count, result_op, tmp); break; 617 default: ShouldNotReachHere(); 618 } 619 } 620 621 622 void LIRGenerator::logic_op (Bytecodes::Code code, LIR_Opr result_op, LIR_Opr left_op, LIR_Opr right_op) { 623 if (TwoOperandLIRForm && left_op != result_op) { 624 assert(right_op != result_op, "malformed"); 625 __ move(left_op, result_op); 626 left_op = result_op; 627 } 628 629 switch(code) { 630 case Bytecodes::_iand: 631 case Bytecodes::_land: __ logical_and(left_op, right_op, result_op); break; 632 633 case Bytecodes::_ior: 634 case Bytecodes::_lor: __ logical_or(left_op, right_op, result_op); break; 635 636 case Bytecodes::_ixor: 637 case Bytecodes::_lxor: __ logical_xor(left_op, right_op, result_op); break; 638 639 default: ShouldNotReachHere(); 640 } 641 } 642 643 644 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) { 645 if (!GenerateSynchronizationCode) return; 646 // for slow path, use debug info for state after successful locking 647 CodeStub* slow_path = new MonitorEnterStub(object, lock, info); 648 __ load_stack_address_monitor(monitor_no, lock); 649 // for handling NullPointerException, use debug info representing just the lock stack before this monitorenter 650 __ lock_object(hdr, object, lock, scratch, slow_path, info_for_exception); 651 } 652 653 654 void LIRGenerator::monitor_exit(LIR_Opr object, LIR_Opr lock, LIR_Opr new_hdr, LIR_Opr scratch, int monitor_no) { 655 if (!GenerateSynchronizationCode) return; 656 // setup registers 657 LIR_Opr hdr = lock; 658 lock = new_hdr; 659 CodeStub* slow_path = new MonitorExitStub(lock, UseFastLocking, monitor_no); 660 __ load_stack_address_monitor(monitor_no, lock); 661 __ unlock_object(hdr, object, lock, scratch, slow_path); 662 } 663 664 #ifndef PRODUCT 665 void LIRGenerator::print_if_not_loaded(const NewInstance* new_instance) { 666 if (PrintNotLoaded && !new_instance->klass()->is_loaded()) { 667 tty->print_cr(" ###class not loaded at new bci %d", new_instance->printable_bci()); 668 } else if (PrintNotLoaded && (TieredCompilation && new_instance->is_unresolved())) { 669 tty->print_cr(" ###class not resolved at new bci %d", new_instance->printable_bci()); 670 } 671 } 672 #endif 673 674 void LIRGenerator::new_instance(LIR_Opr dst, ciInstanceKlass* klass, bool is_unresolved, LIR_Opr scratch1, LIR_Opr scratch2, LIR_Opr scratch3, LIR_Opr scratch4, LIR_Opr klass_reg, CodeEmitInfo* info) { 675 klass2reg_with_patching(klass_reg, klass, info, is_unresolved); 676 // If klass is not loaded we do not know if the klass has finalizers: 677 if (UseFastNewInstance && klass->is_loaded() 678 && !Klass::layout_helper_needs_slow_path(klass->layout_helper())) { 679 680 Runtime1::StubID stub_id = klass->is_initialized() ? Runtime1::fast_new_instance_id : Runtime1::fast_new_instance_init_check_id; 681 682 CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, stub_id); 683 684 assert(klass->is_loaded(), "must be loaded"); 685 // allocate space for instance 686 assert(klass->size_helper() >= 0, "illegal instance size"); 687 const int instance_size = align_object_size(klass->size_helper()); 688 __ allocate_object(dst, scratch1, scratch2, scratch3, scratch4, 689 oopDesc::header_size(), instance_size, klass_reg, !klass->is_initialized(), slow_path); 690 } else { 691 CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, Runtime1::new_instance_id); 692 __ branch(lir_cond_always, T_ILLEGAL, slow_path); 693 __ branch_destination(slow_path->continuation()); 694 } 695 } 696 697 698 static bool is_constant_zero(Instruction* inst) { 699 IntConstant* c = inst->type()->as_IntConstant(); 700 if (c) { 701 return (c->value() == 0); 702 } 703 return false; 704 } 705 706 707 static bool positive_constant(Instruction* inst) { 708 IntConstant* c = inst->type()->as_IntConstant(); 709 if (c) { 710 return (c->value() >= 0); 711 } 712 return false; 713 } 714 715 716 static ciArrayKlass* as_array_klass(ciType* type) { 717 if (type != NULL && type->is_array_klass() && type->is_loaded()) { 718 return (ciArrayKlass*)type; 719 } else { 720 return NULL; 721 } 722 } 723 724 static ciType* phi_declared_type(Phi* phi) { 725 ciType* t = phi->operand_at(0)->declared_type(); 726 if (t == NULL) { 727 return NULL; 728 } 729 for(int i = 1; i < phi->operand_count(); i++) { 730 if (t != phi->operand_at(i)->declared_type()) { 731 return NULL; 732 } 733 } 734 return t; 735 } 736 737 void LIRGenerator::arraycopy_helper(Intrinsic* x, int* flagsp, ciArrayKlass** expected_typep) { 738 Instruction* src = x->argument_at(0); 739 Instruction* src_pos = x->argument_at(1); 740 Instruction* dst = x->argument_at(2); 741 Instruction* dst_pos = x->argument_at(3); 742 Instruction* length = x->argument_at(4); 743 744 // first try to identify the likely type of the arrays involved 745 ciArrayKlass* expected_type = NULL; 746 bool is_exact = false, src_objarray = false, dst_objarray = false; 747 { 748 ciArrayKlass* src_exact_type = as_array_klass(src->exact_type()); 749 ciArrayKlass* src_declared_type = as_array_klass(src->declared_type()); 750 Phi* phi; 751 if (src_declared_type == NULL && (phi = src->as_Phi()) != NULL) { 752 src_declared_type = as_array_klass(phi_declared_type(phi)); 753 } 754 ciArrayKlass* dst_exact_type = as_array_klass(dst->exact_type()); 755 ciArrayKlass* dst_declared_type = as_array_klass(dst->declared_type()); 756 if (dst_declared_type == NULL && (phi = dst->as_Phi()) != NULL) { 757 dst_declared_type = as_array_klass(phi_declared_type(phi)); 758 } 759 760 if (src_exact_type != NULL && src_exact_type == dst_exact_type) { 761 // the types exactly match so the type is fully known 762 is_exact = true; 763 expected_type = src_exact_type; 764 } else if (dst_exact_type != NULL && dst_exact_type->is_obj_array_klass()) { 765 ciArrayKlass* dst_type = (ciArrayKlass*) dst_exact_type; 766 ciArrayKlass* src_type = NULL; 767 if (src_exact_type != NULL && src_exact_type->is_obj_array_klass()) { 768 src_type = (ciArrayKlass*) src_exact_type; 769 } else if (src_declared_type != NULL && src_declared_type->is_obj_array_klass()) { 770 src_type = (ciArrayKlass*) src_declared_type; 771 } 772 if (src_type != NULL) { 773 if (src_type->element_type()->is_subtype_of(dst_type->element_type())) { 774 is_exact = true; 775 expected_type = dst_type; 776 } 777 } 778 } 779 // at least pass along a good guess 780 if (expected_type == NULL) expected_type = dst_exact_type; 781 if (expected_type == NULL) expected_type = src_declared_type; 782 if (expected_type == NULL) expected_type = dst_declared_type; 783 784 src_objarray = (src_exact_type && src_exact_type->is_obj_array_klass()) || (src_declared_type && src_declared_type->is_obj_array_klass()); 785 dst_objarray = (dst_exact_type && dst_exact_type->is_obj_array_klass()) || (dst_declared_type && dst_declared_type->is_obj_array_klass()); 786 } 787 788 // if a probable array type has been identified, figure out if any 789 // of the required checks for a fast case can be elided. 790 int flags = LIR_OpArrayCopy::all_flags; 791 792 if (!src_objarray) 793 flags &= ~LIR_OpArrayCopy::src_objarray; 794 if (!dst_objarray) 795 flags &= ~LIR_OpArrayCopy::dst_objarray; 796 797 if (!x->arg_needs_null_check(0)) 798 flags &= ~LIR_OpArrayCopy::src_null_check; 799 if (!x->arg_needs_null_check(2)) 800 flags &= ~LIR_OpArrayCopy::dst_null_check; 801 802 803 if (expected_type != NULL) { 804 Value length_limit = NULL; 805 806 IfOp* ifop = length->as_IfOp(); 807 if (ifop != NULL) { 808 // look for expressions like min(v, a.length) which ends up as 809 // x > y ? y : x or x >= y ? y : x 810 if ((ifop->cond() == If::gtr || ifop->cond() == If::geq) && 811 ifop->x() == ifop->fval() && 812 ifop->y() == ifop->tval()) { 813 length_limit = ifop->y(); 814 } 815 } 816 817 // try to skip null checks and range checks 818 NewArray* src_array = src->as_NewArray(); 819 if (src_array != NULL) { 820 flags &= ~LIR_OpArrayCopy::src_null_check; 821 if (length_limit != NULL && 822 src_array->length() == length_limit && 823 is_constant_zero(src_pos)) { 824 flags &= ~LIR_OpArrayCopy::src_range_check; 825 } 826 } 827 828 NewArray* dst_array = dst->as_NewArray(); 829 if (dst_array != NULL) { 830 flags &= ~LIR_OpArrayCopy::dst_null_check; 831 if (length_limit != NULL && 832 dst_array->length() == length_limit && 833 is_constant_zero(dst_pos)) { 834 flags &= ~LIR_OpArrayCopy::dst_range_check; 835 } 836 } 837 838 // check from incoming constant values 839 if (positive_constant(src_pos)) 840 flags &= ~LIR_OpArrayCopy::src_pos_positive_check; 841 if (positive_constant(dst_pos)) 842 flags &= ~LIR_OpArrayCopy::dst_pos_positive_check; 843 if (positive_constant(length)) 844 flags &= ~LIR_OpArrayCopy::length_positive_check; 845 846 // see if the range check can be elided, which might also imply 847 // that src or dst is non-null. 848 ArrayLength* al = length->as_ArrayLength(); 849 if (al != NULL) { 850 if (al->array() == src) { 851 // it's the length of the source array 852 flags &= ~LIR_OpArrayCopy::length_positive_check; 853 flags &= ~LIR_OpArrayCopy::src_null_check; 854 if (is_constant_zero(src_pos)) 855 flags &= ~LIR_OpArrayCopy::src_range_check; 856 } 857 if (al->array() == dst) { 858 // it's the length of the destination array 859 flags &= ~LIR_OpArrayCopy::length_positive_check; 860 flags &= ~LIR_OpArrayCopy::dst_null_check; 861 if (is_constant_zero(dst_pos)) 862 flags &= ~LIR_OpArrayCopy::dst_range_check; 863 } 864 } 865 if (is_exact) { 866 flags &= ~LIR_OpArrayCopy::type_check; 867 } 868 } 869 870 IntConstant* src_int = src_pos->type()->as_IntConstant(); 871 IntConstant* dst_int = dst_pos->type()->as_IntConstant(); 872 if (src_int && dst_int) { 873 int s_offs = src_int->value(); 874 int d_offs = dst_int->value(); 875 if (src_int->value() >= dst_int->value()) { 876 flags &= ~LIR_OpArrayCopy::overlapping; 877 } 878 if (expected_type != NULL) { 879 BasicType t = expected_type->element_type()->basic_type(); 880 int element_size = type2aelembytes(t); 881 if (((arrayOopDesc::base_offset_in_bytes(t) + s_offs * element_size) % HeapWordSize == 0) && 882 ((arrayOopDesc::base_offset_in_bytes(t) + d_offs * element_size) % HeapWordSize == 0)) { 883 flags &= ~LIR_OpArrayCopy::unaligned; 884 } 885 } 886 } else if (src_pos == dst_pos || is_constant_zero(dst_pos)) { 887 // src and dest positions are the same, or dst is zero so assume 888 // nonoverlapping copy. 889 flags &= ~LIR_OpArrayCopy::overlapping; 890 } 891 892 if (src == dst) { 893 // moving within a single array so no type checks are needed 894 if (flags & LIR_OpArrayCopy::type_check) { 895 flags &= ~LIR_OpArrayCopy::type_check; 896 } 897 } 898 *flagsp = flags; 899 *expected_typep = (ciArrayKlass*)expected_type; 900 } 901 902 903 LIR_Opr LIRGenerator::round_item(LIR_Opr opr) { 904 assert(opr->is_register(), "why spill if item is not register?"); 905 906 if (RoundFPResults && UseSSE < 1 && opr->is_single_fpu()) { 907 LIR_Opr result = new_register(T_FLOAT); 908 set_vreg_flag(result, must_start_in_memory); 909 assert(opr->is_register(), "only a register can be spilled"); 910 assert(opr->value_type()->is_float(), "rounding only for floats available"); 911 __ roundfp(opr, LIR_OprFact::illegalOpr, result); 912 return result; 913 } 914 return opr; 915 } 916 917 918 LIR_Opr LIRGenerator::force_to_spill(LIR_Opr value, BasicType t) { 919 assert(type2size[t] == type2size[value->type()], 920 err_msg_res("size mismatch: t=%s, value->type()=%s", type2name(t), type2name(value->type()))); 921 if (!value->is_register()) { 922 // force into a register 923 LIR_Opr r = new_register(value->type()); 924 __ move(value, r); 925 value = r; 926 } 927 928 // create a spill location 929 LIR_Opr tmp = new_register(t); 930 set_vreg_flag(tmp, LIRGenerator::must_start_in_memory); 931 932 // move from register to spill 933 __ move(value, tmp); 934 return tmp; 935 } 936 937 void LIRGenerator::profile_branch(If* if_instr, If::Condition cond) { 938 if (if_instr->should_profile()) { 939 ciMethod* method = if_instr->profiled_method(); 940 assert(method != NULL, "method should be set if branch is profiled"); 941 ciMethodData* md = method->method_data_or_null(); 942 assert(md != NULL, "Sanity"); 943 ciProfileData* data = md->bci_to_data(if_instr->profiled_bci()); 944 assert(data != NULL, "must have profiling data"); 945 assert(data->is_BranchData(), "need BranchData for two-way branches"); 946 int taken_count_offset = md->byte_offset_of_slot(data, BranchData::taken_offset()); 947 int not_taken_count_offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset()); 948 if (if_instr->is_swapped()) { 949 int t = taken_count_offset; 950 taken_count_offset = not_taken_count_offset; 951 not_taken_count_offset = t; 952 } 953 954 LIR_Opr md_reg = new_register(T_METADATA); 955 __ metadata2reg(md->constant_encoding(), md_reg); 956 957 LIR_Opr data_offset_reg = new_pointer_register(); 958 __ cmove(lir_cond(cond), 959 LIR_OprFact::intptrConst(taken_count_offset), 960 LIR_OprFact::intptrConst(not_taken_count_offset), 961 data_offset_reg, as_BasicType(if_instr->x()->type())); 962 963 // MDO cells are intptr_t, so the data_reg width is arch-dependent. 964 LIR_Opr data_reg = new_pointer_register(); 965 LIR_Address* data_addr = new LIR_Address(md_reg, data_offset_reg, data_reg->type()); 966 __ move(data_addr, data_reg); 967 // Use leal instead of add to avoid destroying condition codes on x86 968 LIR_Address* fake_incr_value = new LIR_Address(data_reg, DataLayout::counter_increment, T_INT); 969 __ leal(LIR_OprFact::address(fake_incr_value), data_reg); 970 __ move(data_reg, data_addr); 971 } 972 } 973 974 // Phi technique: 975 // This is about passing live values from one basic block to the other. 976 // In code generated with Java it is rather rare that more than one 977 // value is on the stack from one basic block to the other. 978 // We optimize our technique for efficient passing of one value 979 // (of type long, int, double..) but it can be extended. 980 // When entering or leaving a basic block, all registers and all spill 981 // slots are release and empty. We use the released registers 982 // and spill slots to pass the live values from one block 983 // to the other. The topmost value, i.e., the value on TOS of expression 984 // stack is passed in registers. All other values are stored in spilling 985 // area. Every Phi has an index which designates its spill slot 986 // At exit of a basic block, we fill the register(s) and spill slots. 987 // At entry of a basic block, the block_prolog sets up the content of phi nodes 988 // and locks necessary registers and spilling slots. 989 990 991 // move current value to referenced phi function 992 void LIRGenerator::move_to_phi(PhiResolver* resolver, Value cur_val, Value sux_val) { 993 Phi* phi = sux_val->as_Phi(); 994 // cur_val can be null without phi being null in conjunction with inlining 995 if (phi != NULL && cur_val != NULL && cur_val != phi && !phi->is_illegal()) { 996 LIR_Opr operand = cur_val->operand(); 997 if (cur_val->operand()->is_illegal()) { 998 assert(cur_val->as_Constant() != NULL || cur_val->as_Local() != NULL, 999 "these can be produced lazily"); 1000 operand = operand_for_instruction(cur_val); 1001 } 1002 resolver->move(operand, operand_for_instruction(phi)); 1003 } 1004 } 1005 1006 1007 // Moves all stack values into their PHI position 1008 void LIRGenerator::move_to_phi(ValueStack* cur_state) { 1009 BlockBegin* bb = block(); 1010 if (bb->number_of_sux() == 1) { 1011 BlockBegin* sux = bb->sux_at(0); 1012 assert(sux->number_of_preds() > 0, "invalid CFG"); 1013 1014 // a block with only one predecessor never has phi functions 1015 if (sux->number_of_preds() > 1) { 1016 int max_phis = cur_state->stack_size() + cur_state->locals_size(); 1017 PhiResolver resolver(this, _virtual_register_number + max_phis * 2); 1018 1019 ValueStack* sux_state = sux->state(); 1020 Value sux_value; 1021 int index; 1022 1023 assert(cur_state->scope() == sux_state->scope(), "not matching"); 1024 assert(cur_state->locals_size() == sux_state->locals_size(), "not matching"); 1025 assert(cur_state->stack_size() == sux_state->stack_size(), "not matching"); 1026 1027 for_each_stack_value(sux_state, index, sux_value) { 1028 move_to_phi(&resolver, cur_state->stack_at(index), sux_value); 1029 } 1030 1031 for_each_local_value(sux_state, index, sux_value) { 1032 move_to_phi(&resolver, cur_state->local_at(index), sux_value); 1033 } 1034 1035 assert(cur_state->caller_state() == sux_state->caller_state(), "caller states must be equal"); 1036 } 1037 } 1038 } 1039 1040 1041 LIR_Opr LIRGenerator::new_register(BasicType type) { 1042 int vreg = _virtual_register_number; 1043 // add a little fudge factor for the bailout, since the bailout is 1044 // only checked periodically. This gives a few extra registers to 1045 // hand out before we really run out, which helps us keep from 1046 // tripping over assertions. 1047 if (vreg + 20 >= LIR_OprDesc::vreg_max) { 1048 bailout("out of virtual registers"); 1049 if (vreg + 2 >= LIR_OprDesc::vreg_max) { 1050 // wrap it around 1051 _virtual_register_number = LIR_OprDesc::vreg_base; 1052 } 1053 } 1054 _virtual_register_number += 1; 1055 return LIR_OprFact::virtual_register(vreg, type); 1056 } 1057 1058 1059 // Try to lock using register in hint 1060 LIR_Opr LIRGenerator::rlock(Value instr) { 1061 return new_register(instr->type()); 1062 } 1063 1064 1065 // does an rlock and sets result 1066 LIR_Opr LIRGenerator::rlock_result(Value x) { 1067 LIR_Opr reg = rlock(x); 1068 set_result(x, reg); 1069 return reg; 1070 } 1071 1072 1073 // does an rlock and sets result 1074 LIR_Opr LIRGenerator::rlock_result(Value x, BasicType type) { 1075 LIR_Opr reg; 1076 switch (type) { 1077 case T_BYTE: 1078 case T_BOOLEAN: 1079 reg = rlock_byte(type); 1080 break; 1081 default: 1082 reg = rlock(x); 1083 break; 1084 } 1085 1086 set_result(x, reg); 1087 return reg; 1088 } 1089 1090 1091 //--------------------------------------------------------------------- 1092 ciObject* LIRGenerator::get_jobject_constant(Value value) { 1093 ObjectType* oc = value->type()->as_ObjectType(); 1094 if (oc) { 1095 return oc->constant_value(); 1096 } 1097 return NULL; 1098 } 1099 1100 1101 void LIRGenerator::do_ExceptionObject(ExceptionObject* x) { 1102 assert(block()->is_set(BlockBegin::exception_entry_flag), "ExceptionObject only allowed in exception handler block"); 1103 assert(block()->next() == x, "ExceptionObject must be first instruction of block"); 1104 1105 // no moves are created for phi functions at the begin of exception 1106 // handlers, so assign operands manually here 1107 for_each_phi_fun(block(), phi, 1108 operand_for_instruction(phi)); 1109 1110 LIR_Opr thread_reg = getThreadPointer(); 1111 __ move_wide(new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT), 1112 exceptionOopOpr()); 1113 __ move_wide(LIR_OprFact::oopConst(NULL), 1114 new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT)); 1115 __ move_wide(LIR_OprFact::oopConst(NULL), 1116 new LIR_Address(thread_reg, in_bytes(JavaThread::exception_pc_offset()), T_OBJECT)); 1117 1118 LIR_Opr result = new_register(T_OBJECT); 1119 __ move(exceptionOopOpr(), result); 1120 set_result(x, result); 1121 } 1122 1123 1124 //---------------------------------------------------------------------- 1125 //---------------------------------------------------------------------- 1126 //---------------------------------------------------------------------- 1127 //---------------------------------------------------------------------- 1128 // visitor functions 1129 //---------------------------------------------------------------------- 1130 //---------------------------------------------------------------------- 1131 //---------------------------------------------------------------------- 1132 //---------------------------------------------------------------------- 1133 1134 void LIRGenerator::do_Phi(Phi* x) { 1135 // phi functions are never visited directly 1136 ShouldNotReachHere(); 1137 } 1138 1139 1140 // Code for a constant is generated lazily unless the constant is frequently used and can't be inlined. 1141 void LIRGenerator::do_Constant(Constant* x) { 1142 if (x->state_before() != NULL) { 1143 // Any constant with a ValueStack requires patching so emit the patch here 1144 LIR_Opr reg = rlock_result(x); 1145 CodeEmitInfo* info = state_for(x, x->state_before()); 1146 __ oop2reg_patch(NULL, reg, info); 1147 } else if (x->use_count() > 1 && !can_inline_as_constant(x)) { 1148 if (!x->is_pinned()) { 1149 // unpinned constants are handled specially so that they can be 1150 // put into registers when they are used multiple times within a 1151 // block. After the block completes their operand will be 1152 // cleared so that other blocks can't refer to that register. 1153 set_result(x, load_constant(x)); 1154 } else { 1155 LIR_Opr res = x->operand(); 1156 if (!res->is_valid()) { 1157 res = LIR_OprFact::value_type(x->type()); 1158 } 1159 if (res->is_constant()) { 1160 LIR_Opr reg = rlock_result(x); 1161 __ move(res, reg); 1162 } else { 1163 set_result(x, res); 1164 } 1165 } 1166 } else { 1167 set_result(x, LIR_OprFact::value_type(x->type())); 1168 } 1169 } 1170 1171 1172 void LIRGenerator::do_Local(Local* x) { 1173 // operand_for_instruction has the side effect of setting the result 1174 // so there's no need to do it here. 1175 operand_for_instruction(x); 1176 } 1177 1178 1179 void LIRGenerator::do_IfInstanceOf(IfInstanceOf* x) { 1180 Unimplemented(); 1181 } 1182 1183 1184 void LIRGenerator::do_Return(Return* x) { 1185 if (compilation()->env()->dtrace_method_probes()) { 1186 BasicTypeList signature; 1187 signature.append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread 1188 signature.append(T_METADATA); // Method* 1189 LIR_OprList* args = new LIR_OprList(); 1190 args->append(getThreadPointer()); 1191 LIR_Opr meth = new_register(T_METADATA); 1192 __ metadata2reg(method()->constant_encoding(), meth); 1193 args->append(meth); 1194 call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), voidType, NULL); 1195 } 1196 1197 if (x->type()->is_void()) { 1198 __ return_op(LIR_OprFact::illegalOpr); 1199 } else { 1200 LIR_Opr reg = result_register_for(x->type(), /*callee=*/true); 1201 LIRItem result(x->result(), this); 1202 1203 result.load_item_force(reg); 1204 __ return_op(result.result()); 1205 } 1206 set_no_result(x); 1207 } 1208 1209 // Examble: ref.get() 1210 // Combination of LoadField and g1 pre-write barrier 1211 void LIRGenerator::do_Reference_get(Intrinsic* x) { 1212 1213 const int referent_offset = java_lang_ref_Reference::referent_offset; 1214 guarantee(referent_offset > 0, "referent offset not initialized"); 1215 1216 assert(x->number_of_arguments() == 1, "wrong type"); 1217 1218 LIRItem reference(x->argument_at(0), this); 1219 reference.load_item(); 1220 1221 // need to perform the null check on the reference objecy 1222 CodeEmitInfo* info = NULL; 1223 if (x->needs_null_check()) { 1224 info = state_for(x); 1225 } 1226 1227 LIR_Address* referent_field_adr = 1228 new LIR_Address(reference.result(), referent_offset, T_OBJECT); 1229 1230 LIR_Opr result = rlock_result(x); 1231 1232 __ load(referent_field_adr, result, info); 1233 1234 // Register the value in the referent field with the pre-barrier 1235 pre_barrier(LIR_OprFact::illegalOpr /* addr_opr */, 1236 result /* pre_val */, 1237 false /* do_load */, 1238 false /* patch */, 1239 NULL /* info */); 1240 } 1241 1242 // Example: clazz.isInstance(object) 1243 void LIRGenerator::do_isInstance(Intrinsic* x) { 1244 assert(x->number_of_arguments() == 2, "wrong type"); 1245 1246 // TODO could try to substitute this node with an equivalent InstanceOf 1247 // if clazz is known to be a constant Class. This will pick up newly found 1248 // constants after HIR construction. I'll leave this to a future change. 1249 1250 // as a first cut, make a simple leaf call to runtime to stay platform independent. 1251 // could follow the aastore example in a future change. 1252 1253 LIRItem clazz(x->argument_at(0), this); 1254 LIRItem object(x->argument_at(1), this); 1255 clazz.load_item(); 1256 object.load_item(); 1257 LIR_Opr result = rlock_result(x); 1258 1259 // need to perform null check on clazz 1260 if (x->needs_null_check()) { 1261 CodeEmitInfo* info = state_for(x); 1262 __ null_check(clazz.result(), info); 1263 } 1264 1265 LIR_Opr call_result = call_runtime(clazz.value(), object.value(), 1266 CAST_FROM_FN_PTR(address, Runtime1::is_instance_of), 1267 x->type(), 1268 NULL); // NULL CodeEmitInfo results in a leaf call 1269 __ move(call_result, result); 1270 } 1271 1272 // Example: object.getClass () 1273 void LIRGenerator::do_getClass(Intrinsic* x) { 1274 assert(x->number_of_arguments() == 1, "wrong type"); 1275 1276 LIRItem rcvr(x->argument_at(0), this); 1277 rcvr.load_item(); 1278 LIR_Opr temp = new_register(T_METADATA); 1279 LIR_Opr result = rlock_result(x); 1280 1281 // need to perform the null check on the rcvr 1282 CodeEmitInfo* info = NULL; 1283 if (x->needs_null_check()) { 1284 info = state_for(x); 1285 } 1286 1287 // FIXME T_ADDRESS should actually be T_METADATA but it can't because the 1288 // meaning of these two is mixed up (see JDK-8026837). 1289 __ move(new LIR_Address(rcvr.result(), oopDesc::klass_offset_in_bytes(), T_ADDRESS), temp, info); 1290 __ move_wide(new LIR_Address(temp, in_bytes(Klass::java_mirror_offset()), T_OBJECT), result); 1291 } 1292 1293 1294 // Example: Thread.currentThread() 1295 void LIRGenerator::do_currentThread(Intrinsic* x) { 1296 assert(x->number_of_arguments() == 0, "wrong type"); 1297 LIR_Opr reg = rlock_result(x); 1298 __ move_wide(new LIR_Address(getThreadPointer(), in_bytes(JavaThread::threadObj_offset()), T_OBJECT), reg); 1299 } 1300 1301 1302 void LIRGenerator::do_RegisterFinalizer(Intrinsic* x) { 1303 assert(x->number_of_arguments() == 1, "wrong type"); 1304 LIRItem receiver(x->argument_at(0), this); 1305 1306 receiver.load_item(); 1307 BasicTypeList signature; 1308 signature.append(T_OBJECT); // receiver 1309 LIR_OprList* args = new LIR_OprList(); 1310 args->append(receiver.result()); 1311 CodeEmitInfo* info = state_for(x, x->state()); 1312 call_runtime(&signature, args, 1313 CAST_FROM_FN_PTR(address, Runtime1::entry_for(Runtime1::register_finalizer_id)), 1314 voidType, info); 1315 1316 set_no_result(x); 1317 } 1318 1319 1320 //------------------------local access-------------------------------------- 1321 1322 LIR_Opr LIRGenerator::operand_for_instruction(Instruction* x) { 1323 if (x->operand()->is_illegal()) { 1324 Constant* c = x->as_Constant(); 1325 if (c != NULL) { 1326 x->set_operand(LIR_OprFact::value_type(c->type())); 1327 } else { 1328 assert(x->as_Phi() || x->as_Local() != NULL, "only for Phi and Local"); 1329 // allocate a virtual register for this local or phi 1330 x->set_operand(rlock(x)); 1331 _instruction_for_operand.at_put_grow(x->operand()->vreg_number(), x, NULL); 1332 } 1333 } 1334 return x->operand(); 1335 } 1336 1337 1338 Instruction* LIRGenerator::instruction_for_opr(LIR_Opr opr) { 1339 if (opr->is_virtual()) { 1340 return instruction_for_vreg(opr->vreg_number()); 1341 } 1342 return NULL; 1343 } 1344 1345 1346 Instruction* LIRGenerator::instruction_for_vreg(int reg_num) { 1347 if (reg_num < _instruction_for_operand.length()) { 1348 return _instruction_for_operand.at(reg_num); 1349 } 1350 return NULL; 1351 } 1352 1353 1354 void LIRGenerator::set_vreg_flag(int vreg_num, VregFlag f) { 1355 if (_vreg_flags.size_in_bits() == 0) { 1356 BitMap2D temp(100, num_vreg_flags); 1357 temp.clear(); 1358 _vreg_flags = temp; 1359 } 1360 _vreg_flags.at_put_grow(vreg_num, f, true); 1361 } 1362 1363 bool LIRGenerator::is_vreg_flag_set(int vreg_num, VregFlag f) { 1364 if (!_vreg_flags.is_valid_index(vreg_num, f)) { 1365 return false; 1366 } 1367 return _vreg_flags.at(vreg_num, f); 1368 } 1369 1370 1371 // Block local constant handling. This code is useful for keeping 1372 // unpinned constants and constants which aren't exposed in the IR in 1373 // registers. Unpinned Constant instructions have their operands 1374 // cleared when the block is finished so that other blocks can't end 1375 // up referring to their registers. 1376 1377 LIR_Opr LIRGenerator::load_constant(Constant* x) { 1378 assert(!x->is_pinned(), "only for unpinned constants"); 1379 _unpinned_constants.append(x); 1380 return load_constant(LIR_OprFact::value_type(x->type())->as_constant_ptr()); 1381 } 1382 1383 1384 LIR_Opr LIRGenerator::load_constant(LIR_Const* c) { 1385 BasicType t = c->type(); 1386 for (int i = 0; i < _constants.length(); i++) { 1387 LIR_Const* other = _constants.at(i); 1388 if (t == other->type()) { 1389 switch (t) { 1390 case T_INT: 1391 case T_FLOAT: 1392 if (c->as_jint_bits() != other->as_jint_bits()) continue; 1393 break; 1394 case T_LONG: 1395 case T_DOUBLE: 1396 if (c->as_jint_hi_bits() != other->as_jint_hi_bits()) continue; 1397 if (c->as_jint_lo_bits() != other->as_jint_lo_bits()) continue; 1398 break; 1399 case T_OBJECT: 1400 if (c->as_jobject() != other->as_jobject()) continue; 1401 break; 1402 } 1403 return _reg_for_constants.at(i); 1404 } 1405 } 1406 1407 LIR_Opr result = new_register(t); 1408 __ move((LIR_Opr)c, result); 1409 _constants.append(c); 1410 _reg_for_constants.append(result); 1411 return result; 1412 } 1413 1414 // Various barriers 1415 1416 void LIRGenerator::pre_barrier(LIR_Opr addr_opr, LIR_Opr pre_val, 1417 bool do_load, bool patch, CodeEmitInfo* info) { 1418 // Do the pre-write barrier, if any. 1419 switch (_bs->kind()) { 1420 #if INCLUDE_ALL_GCS 1421 case BarrierSet::G1SATBCT: 1422 case BarrierSet::G1SATBCTLogging: 1423 G1SATBCardTableModRef_pre_barrier(addr_opr, pre_val, do_load, patch, info); 1424 break; 1425 #endif // INCLUDE_ALL_GCS 1426 case BarrierSet::CardTableModRef: 1427 case BarrierSet::CardTableExtension: 1428 // No pre barriers 1429 break; 1430 case BarrierSet::ModRef: 1431 case BarrierSet::Other: 1432 // No pre barriers 1433 break; 1434 default : 1435 ShouldNotReachHere(); 1436 1437 } 1438 } 1439 1440 void LIRGenerator::post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) { 1441 switch (_bs->kind()) { 1442 #if INCLUDE_ALL_GCS 1443 case BarrierSet::G1SATBCT: 1444 case BarrierSet::G1SATBCTLogging: 1445 G1SATBCardTableModRef_post_barrier(addr, new_val); 1446 break; 1447 #endif // INCLUDE_ALL_GCS 1448 case BarrierSet::CardTableModRef: 1449 case BarrierSet::CardTableExtension: 1450 CardTableModRef_post_barrier(addr, new_val); 1451 break; 1452 case BarrierSet::ModRef: 1453 case BarrierSet::Other: 1454 // No post barriers 1455 break; 1456 default : 1457 ShouldNotReachHere(); 1458 } 1459 } 1460 1461 //////////////////////////////////////////////////////////////////////// 1462 #if INCLUDE_ALL_GCS 1463 1464 void LIRGenerator::G1SATBCardTableModRef_pre_barrier(LIR_Opr addr_opr, LIR_Opr pre_val, 1465 bool do_load, bool patch, CodeEmitInfo* info) { 1466 // First we test whether marking is in progress. 1467 BasicType flag_type; 1468 if (in_bytes(PtrQueue::byte_width_of_active()) == 4) { 1469 flag_type = T_INT; 1470 } else { 1471 guarantee(in_bytes(PtrQueue::byte_width_of_active()) == 1, 1472 "Assumption"); 1473 flag_type = T_BYTE; 1474 } 1475 LIR_Opr thrd = getThreadPointer(); 1476 LIR_Address* mark_active_flag_addr = 1477 new LIR_Address(thrd, 1478 in_bytes(JavaThread::satb_mark_queue_offset() + 1479 PtrQueue::byte_offset_of_active()), 1480 flag_type); 1481 // Read the marking-in-progress flag. 1482 LIR_Opr flag_val = new_register(T_INT); 1483 __ load(mark_active_flag_addr, flag_val); 1484 __ cmp(lir_cond_notEqual, flag_val, LIR_OprFact::intConst(0)); 1485 1486 LIR_PatchCode pre_val_patch_code = lir_patch_none; 1487 1488 CodeStub* slow; 1489 1490 if (do_load) { 1491 assert(pre_val == LIR_OprFact::illegalOpr, "sanity"); 1492 assert(addr_opr != LIR_OprFact::illegalOpr, "sanity"); 1493 1494 if (patch) 1495 pre_val_patch_code = lir_patch_normal; 1496 1497 pre_val = new_register(T_OBJECT); 1498 1499 if (!addr_opr->is_address()) { 1500 assert(addr_opr->is_register(), "must be"); 1501 addr_opr = LIR_OprFact::address(new LIR_Address(addr_opr, T_OBJECT)); 1502 } 1503 slow = new G1PreBarrierStub(addr_opr, pre_val, pre_val_patch_code, info); 1504 } else { 1505 assert(addr_opr == LIR_OprFact::illegalOpr, "sanity"); 1506 assert(pre_val->is_register(), "must be"); 1507 assert(pre_val->type() == T_OBJECT, "must be an object"); 1508 assert(info == NULL, "sanity"); 1509 1510 slow = new G1PreBarrierStub(pre_val); 1511 } 1512 1513 __ branch(lir_cond_notEqual, T_INT, slow); 1514 __ branch_destination(slow->continuation()); 1515 } 1516 1517 void LIRGenerator::G1SATBCardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) { 1518 // If the "new_val" is a constant NULL, no barrier is necessary. 1519 if (new_val->is_constant() && 1520 new_val->as_constant_ptr()->as_jobject() == NULL) return; 1521 1522 if (!new_val->is_register()) { 1523 LIR_Opr new_val_reg = new_register(T_OBJECT); 1524 if (new_val->is_constant()) { 1525 __ move(new_val, new_val_reg); 1526 } else { 1527 __ leal(new_val, new_val_reg); 1528 } 1529 new_val = new_val_reg; 1530 } 1531 assert(new_val->is_register(), "must be a register at this point"); 1532 1533 if (addr->is_address()) { 1534 LIR_Address* address = addr->as_address_ptr(); 1535 LIR_Opr ptr = new_pointer_register(); 1536 if (!address->index()->is_valid() && address->disp() == 0) { 1537 __ move(address->base(), ptr); 1538 } else { 1539 assert(address->disp() != max_jint, "lea doesn't support patched addresses!"); 1540 __ leal(addr, ptr); 1541 } 1542 addr = ptr; 1543 } 1544 assert(addr->is_register(), "must be a register at this point"); 1545 1546 LIR_Opr xor_res = new_pointer_register(); 1547 LIR_Opr xor_shift_res = new_pointer_register(); 1548 if (TwoOperandLIRForm ) { 1549 __ move(addr, xor_res); 1550 __ logical_xor(xor_res, new_val, xor_res); 1551 __ move(xor_res, xor_shift_res); 1552 __ unsigned_shift_right(xor_shift_res, 1553 LIR_OprFact::intConst(HeapRegion::LogOfHRGrainBytes), 1554 xor_shift_res, 1555 LIR_OprDesc::illegalOpr()); 1556 } else { 1557 __ logical_xor(addr, new_val, xor_res); 1558 __ unsigned_shift_right(xor_res, 1559 LIR_OprFact::intConst(HeapRegion::LogOfHRGrainBytes), 1560 xor_shift_res, 1561 LIR_OprDesc::illegalOpr()); 1562 } 1563 1564 if (!new_val->is_register()) { 1565 LIR_Opr new_val_reg = new_register(T_OBJECT); 1566 __ leal(new_val, new_val_reg); 1567 new_val = new_val_reg; 1568 } 1569 assert(new_val->is_register(), "must be a register at this point"); 1570 1571 __ cmp(lir_cond_notEqual, xor_shift_res, LIR_OprFact::intptrConst(NULL_WORD)); 1572 1573 CodeStub* slow = new G1PostBarrierStub(addr, new_val); 1574 __ branch(lir_cond_notEqual, LP64_ONLY(T_LONG) NOT_LP64(T_INT), slow); 1575 __ branch_destination(slow->continuation()); 1576 } 1577 1578 #endif // INCLUDE_ALL_GCS 1579 //////////////////////////////////////////////////////////////////////// 1580 1581 void LIRGenerator::CardTableModRef_post_barrier(LIR_OprDesc* addr, LIR_OprDesc* new_val) { 1582 1583 assert(sizeof(*((CardTableModRefBS*)_bs)->byte_map_base) == sizeof(jbyte), "adjust this code"); 1584 LIR_Const* card_table_base = new LIR_Const(((CardTableModRefBS*)_bs)->byte_map_base); 1585 if (addr->is_address()) { 1586 LIR_Address* address = addr->as_address_ptr(); 1587 // ptr cannot be an object because we use this barrier for array card marks 1588 // and addr can point in the middle of an array. 1589 LIR_Opr ptr = new_pointer_register(); 1590 if (!address->index()->is_valid() && address->disp() == 0) { 1591 __ move(address->base(), ptr); 1592 } else { 1593 assert(address->disp() != max_jint, "lea doesn't support patched addresses!"); 1594 __ leal(addr, ptr); 1595 } 1596 addr = ptr; 1597 } 1598 assert(addr->is_register(), "must be a register at this point"); 1599 1600 #ifdef CARDTABLEMODREF_POST_BARRIER_HELPER 1601 CardTableModRef_post_barrier_helper(addr, card_table_base); 1602 #else 1603 LIR_Opr tmp = new_pointer_register(); 1604 if (TwoOperandLIRForm) { 1605 __ move(addr, tmp); 1606 __ unsigned_shift_right(tmp, CardTableModRefBS::card_shift, tmp); 1607 } else { 1608 __ unsigned_shift_right(addr, CardTableModRefBS::card_shift, tmp); 1609 } 1610 if (can_inline_as_constant(card_table_base)) { 1611 __ move(LIR_OprFact::intConst(0), 1612 new LIR_Address(tmp, card_table_base->as_jint(), T_BYTE)); 1613 } else { 1614 __ move(LIR_OprFact::intConst(0), 1615 new LIR_Address(tmp, load_constant(card_table_base), 1616 T_BYTE)); 1617 } 1618 #endif 1619 } 1620 1621 1622 //------------------------field access-------------------------------------- 1623 1624 // Comment copied form templateTable_i486.cpp 1625 // ---------------------------------------------------------------------------- 1626 // Volatile variables demand their effects be made known to all CPU's in 1627 // order. Store buffers on most chips allow reads & writes to reorder; the 1628 // JMM's ReadAfterWrite.java test fails in -Xint mode without some kind of 1629 // memory barrier (i.e., it's not sufficient that the interpreter does not 1630 // reorder volatile references, the hardware also must not reorder them). 1631 // 1632 // According to the new Java Memory Model (JMM): 1633 // (1) All volatiles are serialized wrt to each other. 1634 // ALSO reads & writes act as aquire & release, so: 1635 // (2) A read cannot let unrelated NON-volatile memory refs that happen after 1636 // the read float up to before the read. It's OK for non-volatile memory refs 1637 // that happen before the volatile read to float down below it. 1638 // (3) Similar a volatile write cannot let unrelated NON-volatile memory refs 1639 // that happen BEFORE the write float down to after the write. It's OK for 1640 // non-volatile memory refs that happen after the volatile write to float up 1641 // before it. 1642 // 1643 // We only put in barriers around volatile refs (they are expensive), not 1644 // _between_ memory refs (that would require us to track the flavor of the 1645 // previous memory refs). Requirements (2) and (3) require some barriers 1646 // before volatile stores and after volatile loads. These nearly cover 1647 // requirement (1) but miss the volatile-store-volatile-load case. This final 1648 // case is placed after volatile-stores although it could just as well go 1649 // before volatile-loads. 1650 1651 1652 void LIRGenerator::do_StoreField(StoreField* x) { 1653 bool needs_patching = x->needs_patching(); 1654 bool is_volatile = x->field()->is_volatile(); 1655 BasicType field_type = x->field_type(); 1656 bool is_oop = (field_type == T_ARRAY || field_type == T_OBJECT); 1657 1658 CodeEmitInfo* info = NULL; 1659 if (needs_patching) { 1660 assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access"); 1661 info = state_for(x, x->state_before()); 1662 } else if (x->needs_null_check()) { 1663 NullCheck* nc = x->explicit_null_check(); 1664 if (nc == NULL) { 1665 info = state_for(x); 1666 } else { 1667 info = state_for(nc); 1668 } 1669 } 1670 1671 1672 LIRItem object(x->obj(), this); 1673 LIRItem value(x->value(), this); 1674 1675 object.load_item(); 1676 1677 if (is_volatile || needs_patching) { 1678 // load item if field is volatile (fewer special cases for volatiles) 1679 // load item if field not initialized 1680 // load item if field not constant 1681 // because of code patching we cannot inline constants 1682 if (field_type == T_BYTE || field_type == T_BOOLEAN) { 1683 value.load_byte_item(); 1684 } else { 1685 value.load_item(); 1686 } 1687 } else { 1688 value.load_for_store(field_type); 1689 } 1690 1691 set_no_result(x); 1692 1693 #ifndef PRODUCT 1694 if (PrintNotLoaded && needs_patching) { 1695 tty->print_cr(" ###class not loaded at store_%s bci %d", 1696 x->is_static() ? "static" : "field", x->printable_bci()); 1697 } 1698 #endif 1699 1700 if (x->needs_null_check() && 1701 (needs_patching || 1702 MacroAssembler::needs_explicit_null_check(x->offset()))) { 1703 // Emit an explicit null check because the offset is too large. 1704 // If the class is not loaded and the object is NULL, we need to deoptimize to throw a 1705 // NoClassDefFoundError in the interpreter instead of an implicit NPE from compiled code. 1706 __ null_check(object.result(), new CodeEmitInfo(info), /* deoptimize */ needs_patching); 1707 } 1708 1709 LIR_Address* address; 1710 if (needs_patching) { 1711 // we need to patch the offset in the instruction so don't allow 1712 // generate_address to try to be smart about emitting the -1. 1713 // Otherwise the patching code won't know how to find the 1714 // instruction to patch. 1715 address = new LIR_Address(object.result(), PATCHED_ADDR, field_type); 1716 } else { 1717 address = generate_address(object.result(), x->offset(), field_type); 1718 } 1719 1720 if (is_volatile && os::is_MP()) { 1721 __ membar_release(); 1722 } 1723 1724 if (is_oop) { 1725 // Do the pre-write barrier, if any. 1726 pre_barrier(LIR_OprFact::address(address), 1727 LIR_OprFact::illegalOpr /* pre_val */, 1728 true /* do_load*/, 1729 needs_patching, 1730 (info ? new CodeEmitInfo(info) : NULL)); 1731 } 1732 1733 if (is_volatile && !needs_patching) { 1734 volatile_field_store(value.result(), address, info); 1735 } else { 1736 LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none; 1737 __ store(value.result(), address, info, patch_code); 1738 } 1739 1740 if (is_oop) { 1741 // Store to object so mark the card of the header 1742 post_barrier(object.result(), value.result()); 1743 } 1744 1745 if (is_volatile && os::is_MP()) { 1746 __ membar(); 1747 } 1748 } 1749 1750 1751 void LIRGenerator::do_LoadField(LoadField* x) { 1752 bool needs_patching = x->needs_patching(); 1753 bool is_volatile = x->field()->is_volatile(); 1754 BasicType field_type = x->field_type(); 1755 1756 CodeEmitInfo* info = NULL; 1757 if (needs_patching) { 1758 assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access"); 1759 info = state_for(x, x->state_before()); 1760 } else if (x->needs_null_check()) { 1761 NullCheck* nc = x->explicit_null_check(); 1762 if (nc == NULL) { 1763 info = state_for(x); 1764 } else { 1765 info = state_for(nc); 1766 } 1767 } 1768 1769 LIRItem object(x->obj(), this); 1770 1771 object.load_item(); 1772 1773 #ifndef PRODUCT 1774 if (PrintNotLoaded && needs_patching) { 1775 tty->print_cr(" ###class not loaded at load_%s bci %d", 1776 x->is_static() ? "static" : "field", x->printable_bci()); 1777 } 1778 #endif 1779 1780 bool stress_deopt = StressLoopInvariantCodeMotion && info && info->deoptimize_on_exception(); 1781 if (x->needs_null_check() && 1782 (needs_patching || 1783 MacroAssembler::needs_explicit_null_check(x->offset()) || 1784 stress_deopt)) { 1785 LIR_Opr obj = object.result(); 1786 if (stress_deopt) { 1787 obj = new_register(T_OBJECT); 1788 __ move(LIR_OprFact::oopConst(NULL), obj); 1789 } 1790 // Emit an explicit null check because the offset is too large. 1791 // If the class is not loaded and the object is NULL, we need to deoptimize to throw a 1792 // NoClassDefFoundError in the interpreter instead of an implicit NPE from compiled code. 1793 __ null_check(obj, new CodeEmitInfo(info), /* deoptimize */ needs_patching); 1794 } 1795 1796 LIR_Opr reg = rlock_result(x, field_type); 1797 LIR_Address* address; 1798 if (needs_patching) { 1799 // we need to patch the offset in the instruction so don't allow 1800 // generate_address to try to be smart about emitting the -1. 1801 // Otherwise the patching code won't know how to find the 1802 // instruction to patch. 1803 address = new LIR_Address(object.result(), PATCHED_ADDR, field_type); 1804 } else { 1805 address = generate_address(object.result(), x->offset(), field_type); 1806 } 1807 1808 if (is_volatile && !needs_patching) { 1809 volatile_field_load(address, reg, info); 1810 } else { 1811 LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none; 1812 __ load(address, reg, info, patch_code); 1813 } 1814 1815 if (is_volatile && os::is_MP()) { 1816 __ membar_acquire(); 1817 } 1818 } 1819 1820 1821 //------------------------java.nio.Buffer.checkIndex------------------------ 1822 1823 // int java.nio.Buffer.checkIndex(int) 1824 void LIRGenerator::do_NIOCheckIndex(Intrinsic* x) { 1825 // NOTE: by the time we are in checkIndex() we are guaranteed that 1826 // the buffer is non-null (because checkIndex is package-private and 1827 // only called from within other methods in the buffer). 1828 assert(x->number_of_arguments() == 2, "wrong type"); 1829 LIRItem buf (x->argument_at(0), this); 1830 LIRItem index(x->argument_at(1), this); 1831 buf.load_item(); 1832 index.load_item(); 1833 1834 LIR_Opr result = rlock_result(x); 1835 if (GenerateRangeChecks) { 1836 CodeEmitInfo* info = state_for(x); 1837 CodeStub* stub = new RangeCheckStub(info, index.result(), true); 1838 if (index.result()->is_constant()) { 1839 cmp_mem_int(lir_cond_belowEqual, buf.result(), java_nio_Buffer::limit_offset(), index.result()->as_jint(), info); 1840 __ branch(lir_cond_belowEqual, T_INT, stub); 1841 } else { 1842 cmp_reg_mem(lir_cond_aboveEqual, index.result(), buf.result(), 1843 java_nio_Buffer::limit_offset(), T_INT, info); 1844 __ branch(lir_cond_aboveEqual, T_INT, stub); 1845 } 1846 __ move(index.result(), result); 1847 } else { 1848 // Just load the index into the result register 1849 __ move(index.result(), result); 1850 } 1851 } 1852 1853 1854 //------------------------array access-------------------------------------- 1855 1856 1857 void LIRGenerator::do_ArrayLength(ArrayLength* x) { 1858 LIRItem array(x->array(), this); 1859 array.load_item(); 1860 LIR_Opr reg = rlock_result(x); 1861 1862 CodeEmitInfo* info = NULL; 1863 if (x->needs_null_check()) { 1864 NullCheck* nc = x->explicit_null_check(); 1865 if (nc == NULL) { 1866 info = state_for(x); 1867 } else { 1868 info = state_for(nc); 1869 } 1870 if (StressLoopInvariantCodeMotion && info->deoptimize_on_exception()) { 1871 LIR_Opr obj = new_register(T_OBJECT); 1872 __ move(LIR_OprFact::oopConst(NULL), obj); 1873 __ null_check(obj, new CodeEmitInfo(info)); 1874 } 1875 } 1876 __ load(new LIR_Address(array.result(), arrayOopDesc::length_offset_in_bytes(), T_INT), reg, info, lir_patch_none); 1877 } 1878 1879 1880 void LIRGenerator::do_LoadIndexed(LoadIndexed* x) { 1881 bool use_length = x->length() != NULL; 1882 LIRItem array(x->array(), this); 1883 LIRItem index(x->index(), this); 1884 LIRItem length(this); 1885 bool needs_range_check = x->compute_needs_range_check(); 1886 1887 if (use_length && needs_range_check) { 1888 length.set_instruction(x->length()); 1889 length.load_item(); 1890 } 1891 1892 array.load_item(); 1893 if (index.is_constant() && can_inline_as_constant(x->index())) { 1894 // let it be a constant 1895 index.dont_load_item(); 1896 } else { 1897 index.load_item(); 1898 } 1899 1900 CodeEmitInfo* range_check_info = state_for(x); 1901 CodeEmitInfo* null_check_info = NULL; 1902 if (x->needs_null_check()) { 1903 NullCheck* nc = x->explicit_null_check(); 1904 if (nc != NULL) { 1905 null_check_info = state_for(nc); 1906 } else { 1907 null_check_info = range_check_info; 1908 } 1909 if (StressLoopInvariantCodeMotion && null_check_info->deoptimize_on_exception()) { 1910 LIR_Opr obj = new_register(T_OBJECT); 1911 __ move(LIR_OprFact::oopConst(NULL), obj); 1912 __ null_check(obj, new CodeEmitInfo(null_check_info)); 1913 } 1914 } 1915 1916 // emit array address setup early so it schedules better 1917 LIR_Address* array_addr = emit_array_address(array.result(), index.result(), x->elt_type(), false); 1918 1919 if (GenerateRangeChecks && needs_range_check) { 1920 if (StressLoopInvariantCodeMotion && range_check_info->deoptimize_on_exception()) { 1921 __ branch(lir_cond_always, T_ILLEGAL, new RangeCheckStub(range_check_info, index.result())); 1922 } else if (use_length) { 1923 // TODO: use a (modified) version of array_range_check that does not require a 1924 // constant length to be loaded to a register 1925 __ cmp(lir_cond_belowEqual, length.result(), index.result()); 1926 __ branch(lir_cond_belowEqual, T_INT, new RangeCheckStub(range_check_info, index.result())); 1927 } else { 1928 array_range_check(array.result(), index.result(), null_check_info, range_check_info); 1929 // The range check performs the null check, so clear it out for the load 1930 null_check_info = NULL; 1931 } 1932 } 1933 1934 __ move(array_addr, rlock_result(x, x->elt_type()), null_check_info); 1935 } 1936 1937 1938 void LIRGenerator::do_NullCheck(NullCheck* x) { 1939 if (x->can_trap()) { 1940 LIRItem value(x->obj(), this); 1941 value.load_item(); 1942 CodeEmitInfo* info = state_for(x); 1943 __ null_check(value.result(), info); 1944 } 1945 } 1946 1947 1948 void LIRGenerator::do_TypeCast(TypeCast* x) { 1949 LIRItem value(x->obj(), this); 1950 value.load_item(); 1951 // the result is the same as from the node we are casting 1952 set_result(x, value.result()); 1953 } 1954 1955 1956 void LIRGenerator::do_Throw(Throw* x) { 1957 LIRItem exception(x->exception(), this); 1958 exception.load_item(); 1959 set_no_result(x); 1960 LIR_Opr exception_opr = exception.result(); 1961 CodeEmitInfo* info = state_for(x, x->state()); 1962 1963 #ifndef PRODUCT 1964 if (PrintC1Statistics) { 1965 increment_counter(Runtime1::throw_count_address(), T_INT); 1966 } 1967 #endif 1968 1969 // check if the instruction has an xhandler in any of the nested scopes 1970 bool unwind = false; 1971 if (info->exception_handlers()->length() == 0) { 1972 // this throw is not inside an xhandler 1973 unwind = true; 1974 } else { 1975 // get some idea of the throw type 1976 bool type_is_exact = true; 1977 ciType* throw_type = x->exception()->exact_type(); 1978 if (throw_type == NULL) { 1979 type_is_exact = false; 1980 throw_type = x->exception()->declared_type(); 1981 } 1982 if (throw_type != NULL && throw_type->is_instance_klass()) { 1983 ciInstanceKlass* throw_klass = (ciInstanceKlass*)throw_type; 1984 unwind = !x->exception_handlers()->could_catch(throw_klass, type_is_exact); 1985 } 1986 } 1987 1988 // do null check before moving exception oop into fixed register 1989 // to avoid a fixed interval with an oop during the null check. 1990 // Use a copy of the CodeEmitInfo because debug information is 1991 // different for null_check and throw. 1992 if (GenerateCompilerNullChecks && 1993 (x->exception()->as_NewInstance() == NULL && x->exception()->as_ExceptionObject() == NULL)) { 1994 // if the exception object wasn't created using new then it might be null. 1995 __ null_check(exception_opr, new CodeEmitInfo(info, x->state()->copy(ValueStack::ExceptionState, x->state()->bci()))); 1996 } 1997 1998 if (compilation()->env()->jvmti_can_post_on_exceptions()) { 1999 // we need to go through the exception lookup path to get JVMTI 2000 // notification done 2001 unwind = false; 2002 } 2003 2004 // move exception oop into fixed register 2005 __ move(exception_opr, exceptionOopOpr()); 2006 2007 if (unwind) { 2008 __ unwind_exception(exceptionOopOpr()); 2009 } else { 2010 __ throw_exception(exceptionPcOpr(), exceptionOopOpr(), info); 2011 } 2012 } 2013 2014 2015 void LIRGenerator::do_RoundFP(RoundFP* x) { 2016 LIRItem input(x->input(), this); 2017 input.load_item(); 2018 LIR_Opr input_opr = input.result(); 2019 assert(input_opr->is_register(), "why round if value is not in a register?"); 2020 assert(input_opr->is_single_fpu() || input_opr->is_double_fpu(), "input should be floating-point value"); 2021 if (input_opr->is_single_fpu()) { 2022 set_result(x, round_item(input_opr)); // This code path not currently taken 2023 } else { 2024 LIR_Opr result = new_register(T_DOUBLE); 2025 set_vreg_flag(result, must_start_in_memory); 2026 __ roundfp(input_opr, LIR_OprFact::illegalOpr, result); 2027 set_result(x, result); 2028 } 2029 } 2030 2031 // Here UnsafeGetRaw may have x->base() and x->index() be int or long 2032 // on both 64 and 32 bits. Expecting x->base() to be always long on 64bit. 2033 void LIRGenerator::do_UnsafeGetRaw(UnsafeGetRaw* x) { 2034 LIRItem base(x->base(), this); 2035 LIRItem idx(this); 2036 2037 base.load_item(); 2038 if (x->has_index()) { 2039 idx.set_instruction(x->index()); 2040 idx.load_nonconstant(); 2041 } 2042 2043 LIR_Opr reg = rlock_result(x, x->basic_type()); 2044 2045 int log2_scale = 0; 2046 if (x->has_index()) { 2047 log2_scale = x->log2_scale(); 2048 } 2049 2050 assert(!x->has_index() || idx.value() == x->index(), "should match"); 2051 2052 LIR_Opr base_op = base.result(); 2053 LIR_Opr index_op = idx.result(); 2054 #ifndef _LP64 2055 if (base_op->type() == T_LONG) { 2056 base_op = new_register(T_INT); 2057 __ convert(Bytecodes::_l2i, base.result(), base_op); 2058 } 2059 if (x->has_index()) { 2060 if (index_op->type() == T_LONG) { 2061 LIR_Opr long_index_op = index_op; 2062 if (index_op->is_constant()) { 2063 long_index_op = new_register(T_LONG); 2064 __ move(index_op, long_index_op); 2065 } 2066 index_op = new_register(T_INT); 2067 __ convert(Bytecodes::_l2i, long_index_op, index_op); 2068 } else { 2069 assert(x->index()->type()->tag() == intTag, "must be"); 2070 } 2071 } 2072 // At this point base and index should be all ints. 2073 assert(base_op->type() == T_INT && !base_op->is_constant(), "base should be an non-constant int"); 2074 assert(!x->has_index() || index_op->type() == T_INT, "index should be an int"); 2075 #else 2076 if (x->has_index()) { 2077 if (index_op->type() == T_INT) { 2078 if (!index_op->is_constant()) { 2079 index_op = new_register(T_LONG); 2080 __ convert(Bytecodes::_i2l, idx.result(), index_op); 2081 } 2082 } else { 2083 assert(index_op->type() == T_LONG, "must be"); 2084 if (index_op->is_constant()) { 2085 index_op = new_register(T_LONG); 2086 __ move(idx.result(), index_op); 2087 } 2088 } 2089 } 2090 // At this point base is a long non-constant 2091 // Index is a long register or a int constant. 2092 // We allow the constant to stay an int because that would allow us a more compact encoding by 2093 // embedding an immediate offset in the address expression. If we have a long constant, we have to 2094 // move it into a register first. 2095 assert(base_op->type() == T_LONG && !base_op->is_constant(), "base must be a long non-constant"); 2096 assert(!x->has_index() || (index_op->type() == T_INT && index_op->is_constant()) || 2097 (index_op->type() == T_LONG && !index_op->is_constant()), "unexpected index type"); 2098 #endif 2099 2100 BasicType dst_type = x->basic_type(); 2101 2102 LIR_Address* addr; 2103 if (index_op->is_constant()) { 2104 assert(log2_scale == 0, "must not have a scale"); 2105 assert(index_op->type() == T_INT, "only int constants supported"); 2106 addr = new LIR_Address(base_op, index_op->as_jint(), dst_type); 2107 } else { 2108 #ifdef X86 2109 addr = new LIR_Address(base_op, index_op, LIR_Address::Scale(log2_scale), 0, dst_type); 2110 #elif defined(GENERATE_ADDRESS_IS_PREFERRED) 2111 addr = generate_address(base_op, index_op, log2_scale, 0, dst_type); 2112 #else 2113 if (index_op->is_illegal() || log2_scale == 0) { 2114 addr = new LIR_Address(base_op, index_op, dst_type); 2115 } else { 2116 LIR_Opr tmp = new_pointer_register(); 2117 __ shift_left(index_op, log2_scale, tmp); 2118 addr = new LIR_Address(base_op, tmp, dst_type); 2119 } 2120 #endif 2121 } 2122 2123 if (x->may_be_unaligned() && (dst_type == T_LONG || dst_type == T_DOUBLE)) { 2124 __ unaligned_move(addr, reg); 2125 } else { 2126 if (dst_type == T_OBJECT && x->is_wide()) { 2127 __ move_wide(addr, reg); 2128 } else { 2129 __ move(addr, reg); 2130 } 2131 } 2132 } 2133 2134 2135 void LIRGenerator::do_UnsafePutRaw(UnsafePutRaw* x) { 2136 int log2_scale = 0; 2137 BasicType type = x->basic_type(); 2138 2139 if (x->has_index()) { 2140 log2_scale = x->log2_scale(); 2141 } 2142 2143 LIRItem base(x->base(), this); 2144 LIRItem value(x->value(), this); 2145 LIRItem idx(this); 2146 2147 base.load_item(); 2148 if (x->has_index()) { 2149 idx.set_instruction(x->index()); 2150 idx.load_item(); 2151 } 2152 2153 if (type == T_BYTE || type == T_BOOLEAN) { 2154 value.load_byte_item(); 2155 } else { 2156 value.load_item(); 2157 } 2158 2159 set_no_result(x); 2160 2161 LIR_Opr base_op = base.result(); 2162 LIR_Opr index_op = idx.result(); 2163 2164 #ifdef GENERATE_ADDRESS_IS_PREFERRED 2165 LIR_Address* addr = generate_address(base_op, index_op, log2_scale, 0, x->basic_type()); 2166 #else 2167 #ifndef _LP64 2168 if (base_op->type() == T_LONG) { 2169 base_op = new_register(T_INT); 2170 __ convert(Bytecodes::_l2i, base.result(), base_op); 2171 } 2172 if (x->has_index()) { 2173 if (index_op->type() == T_LONG) { 2174 index_op = new_register(T_INT); 2175 __ convert(Bytecodes::_l2i, idx.result(), index_op); 2176 } 2177 } 2178 // At this point base and index should be all ints and not constants 2179 assert(base_op->type() == T_INT && !base_op->is_constant(), "base should be an non-constant int"); 2180 assert(!x->has_index() || (index_op->type() == T_INT && !index_op->is_constant()), "index should be an non-constant int"); 2181 #else 2182 if (x->has_index()) { 2183 if (index_op->type() == T_INT) { 2184 index_op = new_register(T_LONG); 2185 __ convert(Bytecodes::_i2l, idx.result(), index_op); 2186 } 2187 } 2188 // At this point base and index are long and non-constant 2189 assert(base_op->type() == T_LONG && !base_op->is_constant(), "base must be a non-constant long"); 2190 assert(!x->has_index() || (index_op->type() == T_LONG && !index_op->is_constant()), "index must be a non-constant long"); 2191 #endif 2192 2193 if (log2_scale != 0) { 2194 // temporary fix (platform dependent code without shift on Intel would be better) 2195 // TODO: ARM also allows embedded shift in the address 2196 LIR_Opr tmp = new_pointer_register(); 2197 if (TwoOperandLIRForm) { 2198 __ move(index_op, tmp); 2199 index_op = tmp; 2200 } 2201 __ shift_left(index_op, log2_scale, tmp); 2202 if (!TwoOperandLIRForm) { 2203 index_op = tmp; 2204 } 2205 } 2206 2207 LIR_Address* addr = new LIR_Address(base_op, index_op, x->basic_type()); 2208 #endif // !GENERATE_ADDRESS_IS_PREFERRED 2209 __ move(value.result(), addr); 2210 } 2211 2212 2213 void LIRGenerator::do_UnsafeGetObject(UnsafeGetObject* x) { 2214 BasicType type = x->basic_type(); 2215 LIRItem src(x->object(), this); 2216 LIRItem off(x->offset(), this); 2217 2218 off.load_item(); 2219 src.load_item(); 2220 2221 LIR_Opr value = rlock_result(x, x->basic_type()); 2222 2223 get_Object_unsafe(value, src.result(), off.result(), type, x->is_volatile()); 2224 2225 #if INCLUDE_ALL_GCS 2226 // We might be reading the value of the referent field of a 2227 // Reference object in order to attach it back to the live 2228 // object graph. If G1 is enabled then we need to record 2229 // the value that is being returned in an SATB log buffer. 2230 // 2231 // We need to generate code similar to the following... 2232 // 2233 // if (offset == java_lang_ref_Reference::referent_offset) { 2234 // if (src != NULL) { 2235 // if (klass(src)->reference_type() != REF_NONE) { 2236 // pre_barrier(..., value, ...); 2237 // } 2238 // } 2239 // } 2240 2241 if (UseG1GC && type == T_OBJECT) { 2242 bool gen_pre_barrier = true; // Assume we need to generate pre_barrier. 2243 bool gen_offset_check = true; // Assume we need to generate the offset guard. 2244 bool gen_source_check = true; // Assume we need to check the src object for null. 2245 bool gen_type_check = true; // Assume we need to check the reference_type. 2246 2247 if (off.is_constant()) { 2248 jlong off_con = (off.type()->is_int() ? 2249 (jlong) off.get_jint_constant() : 2250 off.get_jlong_constant()); 2251 2252 2253 if (off_con != (jlong) java_lang_ref_Reference::referent_offset) { 2254 // The constant offset is something other than referent_offset. 2255 // We can skip generating/checking the remaining guards and 2256 // skip generation of the code stub. 2257 gen_pre_barrier = false; 2258 } else { 2259 // The constant offset is the same as referent_offset - 2260 // we do not need to generate a runtime offset check. 2261 gen_offset_check = false; 2262 } 2263 } 2264 2265 // We don't need to generate stub if the source object is an array 2266 if (gen_pre_barrier && src.type()->is_array()) { 2267 gen_pre_barrier = false; 2268 } 2269 2270 if (gen_pre_barrier) { 2271 // We still need to continue with the checks. 2272 if (src.is_constant()) { 2273 ciObject* src_con = src.get_jobject_constant(); 2274 guarantee(src_con != NULL, "no source constant"); 2275 2276 if (src_con->is_null_object()) { 2277 // The constant src object is null - We can skip 2278 // generating the code stub. 2279 gen_pre_barrier = false; 2280 } else { 2281 // Non-null constant source object. We still have to generate 2282 // the slow stub - but we don't need to generate the runtime 2283 // null object check. 2284 gen_source_check = false; 2285 } 2286 } 2287 } 2288 if (gen_pre_barrier && !PatchALot) { 2289 // Can the klass of object be statically determined to be 2290 // a sub-class of Reference? 2291 ciType* type = src.value()->declared_type(); 2292 if ((type != NULL) && type->is_loaded()) { 2293 if (type->is_subtype_of(compilation()->env()->Reference_klass())) { 2294 gen_type_check = false; 2295 } else if (type->is_klass() && 2296 !compilation()->env()->Object_klass()->is_subtype_of(type->as_klass())) { 2297 // Not Reference and not Object klass. 2298 gen_pre_barrier = false; 2299 } 2300 } 2301 } 2302 2303 if (gen_pre_barrier) { 2304 LabelObj* Lcont = new LabelObj(); 2305 2306 // We can have generate one runtime check here. Let's start with 2307 // the offset check. 2308 if (gen_offset_check) { 2309 // if (offset != referent_offset) -> continue 2310 // If offset is an int then we can do the comparison with the 2311 // referent_offset constant; otherwise we need to move 2312 // referent_offset into a temporary register and generate 2313 // a reg-reg compare. 2314 2315 LIR_Opr referent_off; 2316 2317 if (off.type()->is_int()) { 2318 referent_off = LIR_OprFact::intConst(java_lang_ref_Reference::referent_offset); 2319 } else { 2320 assert(off.type()->is_long(), "what else?"); 2321 referent_off = new_register(T_LONG); 2322 __ move(LIR_OprFact::longConst(java_lang_ref_Reference::referent_offset), referent_off); 2323 } 2324 __ cmp(lir_cond_notEqual, off.result(), referent_off); 2325 __ branch(lir_cond_notEqual, as_BasicType(off.type()), Lcont->label()); 2326 } 2327 if (gen_source_check) { 2328 // offset is a const and equals referent offset 2329 // if (source == null) -> continue 2330 __ cmp(lir_cond_equal, src.result(), LIR_OprFact::oopConst(NULL)); 2331 __ branch(lir_cond_equal, T_OBJECT, Lcont->label()); 2332 } 2333 LIR_Opr src_klass = new_register(T_OBJECT); 2334 if (gen_type_check) { 2335 // We have determined that offset == referent_offset && src != null. 2336 // if (src->_klass->_reference_type == REF_NONE) -> continue 2337 __ move(new LIR_Address(src.result(), oopDesc::klass_offset_in_bytes(), T_ADDRESS), src_klass); 2338 LIR_Address* reference_type_addr = new LIR_Address(src_klass, in_bytes(InstanceKlass::reference_type_offset()), T_BYTE); 2339 LIR_Opr reference_type = new_register(T_INT); 2340 __ move(reference_type_addr, reference_type); 2341 __ cmp(lir_cond_equal, reference_type, LIR_OprFact::intConst(REF_NONE)); 2342 __ branch(lir_cond_equal, T_INT, Lcont->label()); 2343 } 2344 { 2345 // We have determined that src->_klass->_reference_type != REF_NONE 2346 // so register the value in the referent field with the pre-barrier. 2347 pre_barrier(LIR_OprFact::illegalOpr /* addr_opr */, 2348 value /* pre_val */, 2349 false /* do_load */, 2350 false /* patch */, 2351 NULL /* info */); 2352 } 2353 __ branch_destination(Lcont->label()); 2354 } 2355 } 2356 #endif // INCLUDE_ALL_GCS 2357 2358 if (x->is_volatile() && os::is_MP()) __ membar_acquire(); 2359 } 2360 2361 2362 void LIRGenerator::do_UnsafePutObject(UnsafePutObject* x) { 2363 BasicType type = x->basic_type(); 2364 LIRItem src(x->object(), this); 2365 LIRItem off(x->offset(), this); 2366 LIRItem data(x->value(), this); 2367 2368 src.load_item(); 2369 if (type == T_BOOLEAN || type == T_BYTE) { 2370 data.load_byte_item(); 2371 } else { 2372 data.load_item(); 2373 } 2374 off.load_item(); 2375 2376 set_no_result(x); 2377 2378 if (x->is_volatile() && os::is_MP()) __ membar_release(); 2379 put_Object_unsafe(src.result(), off.result(), data.result(), type, x->is_volatile()); 2380 if (x->is_volatile() && os::is_MP()) __ membar(); 2381 } 2382 2383 2384 void LIRGenerator::do_UnsafePrefetch(UnsafePrefetch* x, bool is_store) { 2385 LIRItem src(x->object(), this); 2386 LIRItem off(x->offset(), this); 2387 2388 src.load_item(); 2389 if (off.is_constant() && can_inline_as_constant(x->offset())) { 2390 // let it be a constant 2391 off.dont_load_item(); 2392 } else { 2393 off.load_item(); 2394 } 2395 2396 set_no_result(x); 2397 2398 LIR_Address* addr = generate_address(src.result(), off.result(), 0, 0, T_BYTE); 2399 __ prefetch(addr, is_store); 2400 } 2401 2402 2403 void LIRGenerator::do_UnsafePrefetchRead(UnsafePrefetchRead* x) { 2404 do_UnsafePrefetch(x, false); 2405 } 2406 2407 2408 void LIRGenerator::do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) { 2409 do_UnsafePrefetch(x, true); 2410 } 2411 2412 2413 void LIRGenerator::do_SwitchRanges(SwitchRangeArray* x, LIR_Opr value, BlockBegin* default_sux) { 2414 int lng = x->length(); 2415 2416 for (int i = 0; i < lng; i++) { 2417 SwitchRange* one_range = x->at(i); 2418 int low_key = one_range->low_key(); 2419 int high_key = one_range->high_key(); 2420 BlockBegin* dest = one_range->sux(); 2421 if (low_key == high_key) { 2422 __ cmp(lir_cond_equal, value, low_key); 2423 __ branch(lir_cond_equal, T_INT, dest); 2424 } else if (high_key - low_key == 1) { 2425 __ cmp(lir_cond_equal, value, low_key); 2426 __ branch(lir_cond_equal, T_INT, dest); 2427 __ cmp(lir_cond_equal, value, high_key); 2428 __ branch(lir_cond_equal, T_INT, dest); 2429 } else { 2430 LabelObj* L = new LabelObj(); 2431 __ cmp(lir_cond_less, value, low_key); 2432 __ branch(lir_cond_less, T_INT, L->label()); 2433 __ cmp(lir_cond_lessEqual, value, high_key); 2434 __ branch(lir_cond_lessEqual, T_INT, dest); 2435 __ branch_destination(L->label()); 2436 } 2437 } 2438 __ jump(default_sux); 2439 } 2440 2441 2442 SwitchRangeArray* LIRGenerator::create_lookup_ranges(TableSwitch* x) { 2443 SwitchRangeList* res = new SwitchRangeList(); 2444 int len = x->length(); 2445 if (len > 0) { 2446 BlockBegin* sux = x->sux_at(0); 2447 int key = x->lo_key(); 2448 BlockBegin* default_sux = x->default_sux(); 2449 SwitchRange* range = new SwitchRange(key, sux); 2450 for (int i = 0; i < len; i++, key++) { 2451 BlockBegin* new_sux = x->sux_at(i); 2452 if (sux == new_sux) { 2453 // still in same range 2454 range->set_high_key(key); 2455 } else { 2456 // skip tests which explicitly dispatch to the default 2457 if (sux != default_sux) { 2458 res->append(range); 2459 } 2460 range = new SwitchRange(key, new_sux); 2461 } 2462 sux = new_sux; 2463 } 2464 if (res->length() == 0 || res->last() != range) res->append(range); 2465 } 2466 return res; 2467 } 2468 2469 2470 // we expect the keys to be sorted by increasing value 2471 SwitchRangeArray* LIRGenerator::create_lookup_ranges(LookupSwitch* x) { 2472 SwitchRangeList* res = new SwitchRangeList(); 2473 int len = x->length(); 2474 if (len > 0) { 2475 BlockBegin* default_sux = x->default_sux(); 2476 int key = x->key_at(0); 2477 BlockBegin* sux = x->sux_at(0); 2478 SwitchRange* range = new SwitchRange(key, sux); 2479 for (int i = 1; i < len; i++) { 2480 int new_key = x->key_at(i); 2481 BlockBegin* new_sux = x->sux_at(i); 2482 if (key+1 == new_key && sux == new_sux) { 2483 // still in same range 2484 range->set_high_key(new_key); 2485 } else { 2486 // skip tests which explicitly dispatch to the default 2487 if (range->sux() != default_sux) { 2488 res->append(range); 2489 } 2490 range = new SwitchRange(new_key, new_sux); 2491 } 2492 key = new_key; 2493 sux = new_sux; 2494 } 2495 if (res->length() == 0 || res->last() != range) res->append(range); 2496 } 2497 return res; 2498 } 2499 2500 2501 void LIRGenerator::do_TableSwitch(TableSwitch* x) { 2502 LIRItem tag(x->tag(), this); 2503 tag.load_item(); 2504 set_no_result(x); 2505 2506 if (x->is_safepoint()) { 2507 __ safepoint(safepoint_poll_register(), state_for(x, x->state_before())); 2508 } 2509 2510 // move values into phi locations 2511 move_to_phi(x->state()); 2512 2513 int lo_key = x->lo_key(); 2514 int hi_key = x->hi_key(); 2515 int len = x->length(); 2516 LIR_Opr value = tag.result(); 2517 if (UseTableRanges) { 2518 do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux()); 2519 } else { 2520 for (int i = 0; i < len; i++) { 2521 __ cmp(lir_cond_equal, value, i + lo_key); 2522 __ branch(lir_cond_equal, T_INT, x->sux_at(i)); 2523 } 2524 __ jump(x->default_sux()); 2525 } 2526 } 2527 2528 2529 void LIRGenerator::do_LookupSwitch(LookupSwitch* x) { 2530 LIRItem tag(x->tag(), this); 2531 tag.load_item(); 2532 set_no_result(x); 2533 2534 if (x->is_safepoint()) { 2535 __ safepoint(safepoint_poll_register(), state_for(x, x->state_before())); 2536 } 2537 2538 // move values into phi locations 2539 move_to_phi(x->state()); 2540 2541 LIR_Opr value = tag.result(); 2542 if (UseTableRanges) { 2543 do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux()); 2544 } else { 2545 int len = x->length(); 2546 for (int i = 0; i < len; i++) { 2547 __ cmp(lir_cond_equal, value, x->key_at(i)); 2548 __ branch(lir_cond_equal, T_INT, x->sux_at(i)); 2549 } 2550 __ jump(x->default_sux()); 2551 } 2552 } 2553 2554 2555 void LIRGenerator::do_Goto(Goto* x) { 2556 set_no_result(x); 2557 2558 if (block()->next()->as_OsrEntry()) { 2559 // need to free up storage used for OSR entry point 2560 LIR_Opr osrBuffer = block()->next()->operand(); 2561 BasicTypeList signature; 2562 signature.append(NOT_LP64(T_INT) LP64_ONLY(T_LONG)); // pass a pointer to osrBuffer 2563 CallingConvention* cc = frame_map()->c_calling_convention(&signature); 2564 __ move(osrBuffer, cc->args()->at(0)); 2565 __ call_runtime_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end), 2566 getThreadTemp(), LIR_OprFact::illegalOpr, cc->args()); 2567 } 2568 2569 if (x->is_safepoint()) { 2570 ValueStack* state = x->state_before() ? x->state_before() : x->state(); 2571 2572 // increment backedge counter if needed 2573 CodeEmitInfo* info = state_for(x, state); 2574 increment_backedge_counter(info, x->profiled_bci()); 2575 CodeEmitInfo* safepoint_info = state_for(x, state); 2576 __ safepoint(safepoint_poll_register(), safepoint_info); 2577 } 2578 2579 // Gotos can be folded Ifs, handle this case. 2580 if (x->should_profile()) { 2581 ciMethod* method = x->profiled_method(); 2582 assert(method != NULL, "method should be set if branch is profiled"); 2583 ciMethodData* md = method->method_data_or_null(); 2584 assert(md != NULL, "Sanity"); 2585 ciProfileData* data = md->bci_to_data(x->profiled_bci()); 2586 assert(data != NULL, "must have profiling data"); 2587 int offset; 2588 if (x->direction() == Goto::taken) { 2589 assert(data->is_BranchData(), "need BranchData for two-way branches"); 2590 offset = md->byte_offset_of_slot(data, BranchData::taken_offset()); 2591 } else if (x->direction() == Goto::not_taken) { 2592 assert(data->is_BranchData(), "need BranchData for two-way branches"); 2593 offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset()); 2594 } else { 2595 assert(data->is_JumpData(), "need JumpData for branches"); 2596 offset = md->byte_offset_of_slot(data, JumpData::taken_offset()); 2597 } 2598 LIR_Opr md_reg = new_register(T_METADATA); 2599 __ metadata2reg(md->constant_encoding(), md_reg); 2600 2601 increment_counter(new LIR_Address(md_reg, offset, 2602 NOT_LP64(T_INT) LP64_ONLY(T_LONG)), DataLayout::counter_increment); 2603 } 2604 2605 // emit phi-instruction move after safepoint since this simplifies 2606 // describing the state as the safepoint. 2607 move_to_phi(x->state()); 2608 2609 __ jump(x->default_sux()); 2610 } 2611 2612 /** 2613 * Emit profiling code if needed for arguments, parameters, return value types 2614 * 2615 * @param md MDO the code will update at runtime 2616 * @param md_base_offset common offset in the MDO for this profile and subsequent ones 2617 * @param md_offset offset in the MDO (on top of md_base_offset) for this profile 2618 * @param profiled_k current profile 2619 * @param obj IR node for the object to be profiled 2620 * @param mdp register to hold the pointer inside the MDO (md + md_base_offset). 2621 * Set once we find an update to make and use for next ones. 2622 * @param not_null true if we know obj cannot be null 2623 * @param signature_at_call_k signature at call for obj 2624 * @param callee_signature_k signature of callee for obj 2625 * at call and callee signatures differ at method handle call 2626 * @return the only klass we know will ever be seen at this profile point 2627 */ 2628 ciKlass* LIRGenerator::profile_type(ciMethodData* md, int md_base_offset, int md_offset, intptr_t profiled_k, 2629 Value obj, LIR_Opr& mdp, bool not_null, ciKlass* signature_at_call_k, 2630 ciKlass* callee_signature_k) { 2631 ciKlass* result = NULL; 2632 bool do_null = !not_null && !TypeEntries::was_null_seen(profiled_k); 2633 bool do_update = !TypeEntries::is_type_unknown(profiled_k); 2634 // known not to be null or null bit already set and already set to 2635 // unknown: nothing we can do to improve profiling 2636 if (!do_null && !do_update) { 2637 return result; 2638 } 2639 2640 ciKlass* exact_klass = NULL; 2641 Compilation* comp = Compilation::current(); 2642 if (do_update) { 2643 // try to find exact type, using CHA if possible, so that loading 2644 // the klass from the object can be avoided 2645 ciType* type = obj->exact_type(); 2646 if (type == NULL) { 2647 type = obj->declared_type(); 2648 type = comp->cha_exact_type(type); 2649 } 2650 assert(type == NULL || type->is_klass(), "type should be class"); 2651 exact_klass = (type != NULL && type->is_loaded()) ? (ciKlass*)type : NULL; 2652 2653 do_update = exact_klass == NULL || ciTypeEntries::valid_ciklass(profiled_k) != exact_klass; 2654 } 2655 2656 if (!do_null && !do_update) { 2657 return result; 2658 } 2659 2660 ciKlass* exact_signature_k = NULL; 2661 if (do_update) { 2662 // Is the type from the signature exact (the only one possible)? 2663 exact_signature_k = signature_at_call_k->exact_klass(); 2664 if (exact_signature_k == NULL) { 2665 exact_signature_k = comp->cha_exact_type(signature_at_call_k); 2666 } else { 2667 result = exact_signature_k; 2668 // Known statically. No need to emit any code: prevent 2669 // LIR_Assembler::emit_profile_type() from emitting useless code 2670 profiled_k = ciTypeEntries::with_status(result, profiled_k); 2671 } 2672 // exact_klass and exact_signature_k can be both non NULL but 2673 // different if exact_klass is loaded after the ciObject for 2674 // exact_signature_k is created. 2675 if (exact_klass == NULL && exact_signature_k != NULL && exact_klass != exact_signature_k) { 2676 // sometimes the type of the signature is better than the best type 2677 // the compiler has 2678 exact_klass = exact_signature_k; 2679 } 2680 if (callee_signature_k != NULL && 2681 callee_signature_k != signature_at_call_k) { 2682 ciKlass* improved_klass = callee_signature_k->exact_klass(); 2683 if (improved_klass == NULL) { 2684 improved_klass = comp->cha_exact_type(callee_signature_k); 2685 } 2686 if (exact_klass == NULL && improved_klass != NULL && exact_klass != improved_klass) { 2687 exact_klass = exact_signature_k; 2688 } 2689 } 2690 do_update = exact_klass == NULL || ciTypeEntries::valid_ciklass(profiled_k) != exact_klass; 2691 } 2692 2693 if (!do_null && !do_update) { 2694 return result; 2695 } 2696 2697 if (mdp == LIR_OprFact::illegalOpr) { 2698 mdp = new_register(T_METADATA); 2699 __ metadata2reg(md->constant_encoding(), mdp); 2700 if (md_base_offset != 0) { 2701 LIR_Address* base_type_address = new LIR_Address(mdp, md_base_offset, T_ADDRESS); 2702 mdp = new_pointer_register(); 2703 __ leal(LIR_OprFact::address(base_type_address), mdp); 2704 } 2705 } 2706 LIRItem value(obj, this); 2707 value.load_item(); 2708 __ profile_type(new LIR_Address(mdp, md_offset, T_METADATA), 2709 value.result(), exact_klass, profiled_k, new_pointer_register(), not_null, exact_signature_k != NULL); 2710 return result; 2711 } 2712 2713 // profile parameters on entry to the root of the compilation 2714 void LIRGenerator::profile_parameters(Base* x) { 2715 if (compilation()->profile_parameters()) { 2716 CallingConvention* args = compilation()->frame_map()->incoming_arguments(); 2717 ciMethodData* md = scope()->method()->method_data_or_null(); 2718 assert(md != NULL, "Sanity"); 2719 2720 if (md->parameters_type_data() != NULL) { 2721 ciParametersTypeData* parameters_type_data = md->parameters_type_data(); 2722 ciTypeStackSlotEntries* parameters = parameters_type_data->parameters(); 2723 LIR_Opr mdp = LIR_OprFact::illegalOpr; 2724 for (int java_index = 0, i = 0, j = 0; j < parameters_type_data->number_of_parameters(); i++) { 2725 LIR_Opr src = args->at(i); 2726 assert(!src->is_illegal(), "check"); 2727 BasicType t = src->type(); 2728 if (t == T_OBJECT || t == T_ARRAY) { 2729 intptr_t profiled_k = parameters->type(j); 2730 Local* local = x->state()->local_at(java_index)->as_Local(); 2731 ciKlass* exact = profile_type(md, md->byte_offset_of_slot(parameters_type_data, ParametersTypeData::type_offset(0)), 2732 in_bytes(ParametersTypeData::type_offset(j)) - in_bytes(ParametersTypeData::type_offset(0)), 2733 profiled_k, local, mdp, false, local->declared_type()->as_klass(), NULL); 2734 // If the profile is known statically set it once for all and do not emit any code 2735 if (exact != NULL) { 2736 md->set_parameter_type(j, exact); 2737 } 2738 j++; 2739 } 2740 java_index += type2size[t]; 2741 } 2742 } 2743 } 2744 } 2745 2746 void LIRGenerator::do_Base(Base* x) { 2747 __ std_entry(LIR_OprFact::illegalOpr); 2748 // Emit moves from physical registers / stack slots to virtual registers 2749 CallingConvention* args = compilation()->frame_map()->incoming_arguments(); 2750 IRScope* irScope = compilation()->hir()->top_scope(); 2751 int java_index = 0; 2752 for (int i = 0; i < args->length(); i++) { 2753 LIR_Opr src = args->at(i); 2754 assert(!src->is_illegal(), "check"); 2755 BasicType t = src->type(); 2756 2757 // Types which are smaller than int are passed as int, so 2758 // correct the type which passed. 2759 switch (t) { 2760 case T_BYTE: 2761 case T_BOOLEAN: 2762 case T_SHORT: 2763 case T_CHAR: 2764 t = T_INT; 2765 break; 2766 } 2767 2768 LIR_Opr dest = new_register(t); 2769 __ move(src, dest); 2770 2771 // Assign new location to Local instruction for this local 2772 Local* local = x->state()->local_at(java_index)->as_Local(); 2773 assert(local != NULL, "Locals for incoming arguments must have been created"); 2774 #ifndef __SOFTFP__ 2775 // The java calling convention passes double as long and float as int. 2776 assert(as_ValueType(t)->tag() == local->type()->tag(), "check"); 2777 #endif // __SOFTFP__ 2778 local->set_operand(dest); 2779 _instruction_for_operand.at_put_grow(dest->vreg_number(), local, NULL); 2780 java_index += type2size[t]; 2781 } 2782 2783 if (compilation()->env()->dtrace_method_probes()) { 2784 BasicTypeList signature; 2785 signature.append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread 2786 signature.append(T_METADATA); // Method* 2787 LIR_OprList* args = new LIR_OprList(); 2788 args->append(getThreadPointer()); 2789 LIR_Opr meth = new_register(T_METADATA); 2790 __ metadata2reg(method()->constant_encoding(), meth); 2791 args->append(meth); 2792 call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), voidType, NULL); 2793 } 2794 2795 if (method()->is_synchronized()) { 2796 LIR_Opr obj; 2797 if (method()->is_static()) { 2798 obj = new_register(T_OBJECT); 2799 __ oop2reg(method()->holder()->java_mirror()->constant_encoding(), obj); 2800 } else { 2801 Local* receiver = x->state()->local_at(0)->as_Local(); 2802 assert(receiver != NULL, "must already exist"); 2803 obj = receiver->operand(); 2804 } 2805 assert(obj->is_valid(), "must be valid"); 2806 2807 if (method()->is_synchronized() && GenerateSynchronizationCode) { 2808 LIR_Opr lock = new_register(T_INT); 2809 __ load_stack_address_monitor(0, lock); 2810 2811 CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, SynchronizationEntryBCI), NULL, x->check_flag(Instruction::DeoptimizeOnException)); 2812 CodeStub* slow_path = new MonitorEnterStub(obj, lock, info); 2813 2814 // receiver is guaranteed non-NULL so don't need CodeEmitInfo 2815 __ lock_object(syncTempOpr(), obj, lock, new_register(T_OBJECT), slow_path, NULL); 2816 } 2817 } 2818 2819 // increment invocation counters if needed 2820 if (!method()->is_accessor()) { // Accessors do not have MDOs, so no counting. 2821 profile_parameters(x); 2822 CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, SynchronizationEntryBCI), NULL, false); 2823 increment_invocation_counter(info); 2824 } 2825 2826 // all blocks with a successor must end with an unconditional jump 2827 // to the successor even if they are consecutive 2828 __ jump(x->default_sux()); 2829 } 2830 2831 2832 void LIRGenerator::do_OsrEntry(OsrEntry* x) { 2833 // construct our frame and model the production of incoming pointer 2834 // to the OSR buffer. 2835 __ osr_entry(LIR_Assembler::osrBufferPointer()); 2836 LIR_Opr result = rlock_result(x); 2837 __ move(LIR_Assembler::osrBufferPointer(), result); 2838 } 2839 2840 2841 void LIRGenerator::invoke_load_arguments(Invoke* x, LIRItemList* args, const LIR_OprList* arg_list) { 2842 assert(args->length() == arg_list->length(), 2843 err_msg_res("args=%d, arg_list=%d", args->length(), arg_list->length())); 2844 for (int i = x->has_receiver() ? 1 : 0; i < args->length(); i++) { 2845 LIRItem* param = args->at(i); 2846 LIR_Opr loc = arg_list->at(i); 2847 if (loc->is_register()) { 2848 param->load_item_force(loc); 2849 } else { 2850 LIR_Address* addr = loc->as_address_ptr(); 2851 param->load_for_store(addr->type()); 2852 if (addr->type() == T_OBJECT) { 2853 __ move_wide(param->result(), addr); 2854 } else 2855 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 2856 __ unaligned_move(param->result(), addr); 2857 } else { 2858 __ move(param->result(), addr); 2859 } 2860 } 2861 } 2862 2863 if (x->has_receiver()) { 2864 LIRItem* receiver = args->at(0); 2865 LIR_Opr loc = arg_list->at(0); 2866 if (loc->is_register()) { 2867 receiver->load_item_force(loc); 2868 } else { 2869 assert(loc->is_address(), "just checking"); 2870 receiver->load_for_store(T_OBJECT); 2871 __ move_wide(receiver->result(), loc->as_address_ptr()); 2872 } 2873 } 2874 } 2875 2876 2877 // Visits all arguments, returns appropriate items without loading them 2878 LIRItemList* LIRGenerator::invoke_visit_arguments(Invoke* x) { 2879 LIRItemList* argument_items = new LIRItemList(); 2880 if (x->has_receiver()) { 2881 LIRItem* receiver = new LIRItem(x->receiver(), this); 2882 argument_items->append(receiver); 2883 } 2884 for (int i = 0; i < x->number_of_arguments(); i++) { 2885 LIRItem* param = new LIRItem(x->argument_at(i), this); 2886 argument_items->append(param); 2887 } 2888 return argument_items; 2889 } 2890 2891 2892 // The invoke with receiver has following phases: 2893 // a) traverse and load/lock receiver; 2894 // b) traverse all arguments -> item-array (invoke_visit_argument) 2895 // c) push receiver on stack 2896 // d) load each of the items and push on stack 2897 // e) unlock receiver 2898 // f) move receiver into receiver-register %o0 2899 // g) lock result registers and emit call operation 2900 // 2901 // Before issuing a call, we must spill-save all values on stack 2902 // that are in caller-save register. "spill-save" moves those registers 2903 // either in a free callee-save register or spills them if no free 2904 // callee save register is available. 2905 // 2906 // The problem is where to invoke spill-save. 2907 // - if invoked between e) and f), we may lock callee save 2908 // register in "spill-save" that destroys the receiver register 2909 // before f) is executed 2910 // - if we rearrange f) to be earlier (by loading %o0) it 2911 // may destroy a value on the stack that is currently in %o0 2912 // and is waiting to be spilled 2913 // - if we keep the receiver locked while doing spill-save, 2914 // we cannot spill it as it is spill-locked 2915 // 2916 void LIRGenerator::do_Invoke(Invoke* x) { 2917 CallingConvention* cc = frame_map()->java_calling_convention(x->signature(), true); 2918 2919 LIR_OprList* arg_list = cc->args(); 2920 LIRItemList* args = invoke_visit_arguments(x); 2921 LIR_Opr receiver = LIR_OprFact::illegalOpr; 2922 2923 // setup result register 2924 LIR_Opr result_register = LIR_OprFact::illegalOpr; 2925 if (x->type() != voidType) { 2926 result_register = result_register_for(x->type()); 2927 } 2928 2929 CodeEmitInfo* info = state_for(x, x->state()); 2930 2931 invoke_load_arguments(x, args, arg_list); 2932 2933 if (x->has_receiver()) { 2934 args->at(0)->load_item_force(LIR_Assembler::receiverOpr()); 2935 receiver = args->at(0)->result(); 2936 } 2937 2938 // emit invoke code 2939 bool optimized = x->target_is_loaded() && x->target_is_final(); 2940 assert(receiver->is_illegal() || receiver->is_equal(LIR_Assembler::receiverOpr()), "must match"); 2941 2942 // JSR 292 2943 // Preserve the SP over MethodHandle call sites, if needed. 2944 ciMethod* target = x->target(); 2945 bool is_method_handle_invoke = (// %%% FIXME: Are both of these relevant? 2946 target->is_method_handle_intrinsic() || 2947 target->is_compiled_lambda_form()); 2948 if (is_method_handle_invoke) { 2949 info->set_is_method_handle_invoke(true); 2950 if(FrameMap::method_handle_invoke_SP_save_opr() != LIR_OprFact::illegalOpr) { 2951 __ move(FrameMap::stack_pointer(), FrameMap::method_handle_invoke_SP_save_opr()); 2952 } 2953 } 2954 2955 switch (x->code()) { 2956 case Bytecodes::_invokestatic: 2957 __ call_static(target, result_register, 2958 SharedRuntime::get_resolve_static_call_stub(), 2959 arg_list, info); 2960 break; 2961 case Bytecodes::_invokespecial: 2962 case Bytecodes::_invokevirtual: 2963 case Bytecodes::_invokeinterface: 2964 // for final target we still produce an inline cache, in order 2965 // to be able to call mixed mode 2966 if (x->code() == Bytecodes::_invokespecial || optimized) { 2967 __ call_opt_virtual(target, receiver, result_register, 2968 SharedRuntime::get_resolve_opt_virtual_call_stub(), 2969 arg_list, info); 2970 } else if (x->vtable_index() < 0) { 2971 __ call_icvirtual(target, receiver, result_register, 2972 SharedRuntime::get_resolve_virtual_call_stub(), 2973 arg_list, info); 2974 } else { 2975 int entry_offset = InstanceKlass::vtable_start_offset() + x->vtable_index() * vtableEntry::size(); 2976 int vtable_offset = entry_offset * wordSize + vtableEntry::method_offset_in_bytes(); 2977 __ call_virtual(target, receiver, result_register, vtable_offset, arg_list, info); 2978 } 2979 break; 2980 case Bytecodes::_invokedynamic: { 2981 __ call_dynamic(target, receiver, result_register, 2982 SharedRuntime::get_resolve_static_call_stub(), 2983 arg_list, info); 2984 break; 2985 } 2986 default: 2987 fatal(err_msg("unexpected bytecode: %s", Bytecodes::name(x->code()))); 2988 break; 2989 } 2990 2991 // JSR 292 2992 // Restore the SP after MethodHandle call sites, if needed. 2993 if (is_method_handle_invoke 2994 && FrameMap::method_handle_invoke_SP_save_opr() != LIR_OprFact::illegalOpr) { 2995 __ move(FrameMap::method_handle_invoke_SP_save_opr(), FrameMap::stack_pointer()); 2996 } 2997 2998 if (x->type()->is_float() || x->type()->is_double()) { 2999 // Force rounding of results from non-strictfp when in strictfp 3000 // scope (or when we don't know the strictness of the callee, to 3001 // be safe.) 3002 if (method()->is_strict()) { 3003 if (!x->target_is_loaded() || !x->target_is_strictfp()) { 3004 result_register = round_item(result_register); 3005 } 3006 } 3007 } 3008 3009 if (result_register->is_valid()) { 3010 LIR_Opr result = rlock_result(x); 3011 __ move(result_register, result); 3012 } 3013 } 3014 3015 3016 void LIRGenerator::do_FPIntrinsics(Intrinsic* x) { 3017 assert(x->number_of_arguments() == 1, "wrong type"); 3018 LIRItem value (x->argument_at(0), this); 3019 LIR_Opr reg = rlock_result(x); 3020 value.load_item(); 3021 LIR_Opr tmp = force_to_spill(value.result(), as_BasicType(x->type())); 3022 __ move(tmp, reg); 3023 } 3024 3025 3026 3027 // Code for : x->x() {x->cond()} x->y() ? x->tval() : x->fval() 3028 void LIRGenerator::do_IfOp(IfOp* x) { 3029 #ifdef ASSERT 3030 { 3031 ValueTag xtag = x->x()->type()->tag(); 3032 ValueTag ttag = x->tval()->type()->tag(); 3033 assert(xtag == intTag || xtag == objectTag, "cannot handle others"); 3034 assert(ttag == addressTag || ttag == intTag || ttag == objectTag || ttag == longTag, "cannot handle others"); 3035 assert(ttag == x->fval()->type()->tag(), "cannot handle others"); 3036 } 3037 #endif 3038 3039 LIRItem left(x->x(), this); 3040 LIRItem right(x->y(), this); 3041 left.load_item(); 3042 if (can_inline_as_constant(right.value())) { 3043 right.dont_load_item(); 3044 } else { 3045 right.load_item(); 3046 } 3047 3048 LIRItem t_val(x->tval(), this); 3049 LIRItem f_val(x->fval(), this); 3050 t_val.dont_load_item(); 3051 f_val.dont_load_item(); 3052 LIR_Opr reg = rlock_result(x); 3053 3054 __ cmp(lir_cond(x->cond()), left.result(), right.result()); 3055 __ cmove(lir_cond(x->cond()), t_val.result(), f_val.result(), reg, as_BasicType(x->x()->type())); 3056 } 3057 3058 #ifdef JFR_HAVE_INTRINSICS 3059 void LIRGenerator::do_ClassIDIntrinsic(Intrinsic* x) { 3060 CodeEmitInfo* info = state_for(x); 3061 CodeEmitInfo* info2 = new CodeEmitInfo(info); // Clone for the second null check 3062 3063 assert(info != NULL, "must have info"); 3064 LIRItem arg(x->argument_at(0), this); 3065 3066 arg.load_item(); 3067 LIR_Opr klass = new_register(T_METADATA); 3068 __ move(new LIR_Address(arg.result(), java_lang_Class::klass_offset_in_bytes(), T_ADDRESS), klass, info); 3069 LIR_Opr id = new_register(T_LONG); 3070 ByteSize offset = KLASS_TRACE_ID_OFFSET; 3071 LIR_Address* trace_id_addr = new LIR_Address(klass, in_bytes(offset), T_LONG); 3072 3073 __ move(trace_id_addr, id); 3074 __ logical_or(id, LIR_OprFact::longConst(0x01l), id); 3075 __ store(id, trace_id_addr); 3076 3077 #ifdef TRACE_ID_META_BITS 3078 __ logical_and(id, LIR_OprFact::longConst(~TRACE_ID_META_BITS), id); 3079 #endif 3080 #ifdef TRACE_ID_SHIFT 3081 __ unsigned_shift_right(id, TRACE_ID_SHIFT, id); 3082 #endif 3083 3084 __ move(id, rlock_result(x)); 3085 } 3086 3087 void LIRGenerator::do_getEventWriter(Intrinsic* x) { 3088 LabelObj* L_end = new LabelObj(); 3089 3090 LIR_Address* jobj_addr = new LIR_Address(getThreadPointer(), 3091 in_bytes(THREAD_LOCAL_WRITER_OFFSET_JFR), 3092 T_OBJECT); 3093 LIR_Opr result = rlock_result(x); 3094 __ move_wide(jobj_addr, result); 3095 __ cmp(lir_cond_equal, result, LIR_OprFact::oopConst(NULL)); 3096 __ branch(lir_cond_equal, T_OBJECT, L_end->label()); 3097 __ move_wide(new LIR_Address(result, T_OBJECT), result); 3098 3099 __ branch_destination(L_end->label()); 3100 } 3101 #endif 3102 3103 void LIRGenerator::do_RuntimeCall(address routine, int expected_arguments, Intrinsic* x) { 3104 assert(x->number_of_arguments() == expected_arguments, "wrong type"); 3105 LIR_Opr reg = result_register_for(x->type()); 3106 __ call_runtime_leaf(routine, getThreadTemp(), 3107 reg, new LIR_OprList()); 3108 LIR_Opr result = rlock_result(x); 3109 __ move(reg, result); 3110 } 3111 3112 #ifdef TRACE_HAVE_INTRINSICS 3113 void LIRGenerator::do_ThreadIDIntrinsic(Intrinsic* x) { 3114 LIR_Opr thread = getThreadPointer(); 3115 LIR_Opr osthread = new_pointer_register(); 3116 __ move(new LIR_Address(thread, in_bytes(JavaThread::osthread_offset()), osthread->type()), osthread); 3117 size_t thread_id_size = OSThread::thread_id_size(); 3118 if (thread_id_size == (size_t) BytesPerLong) { 3119 LIR_Opr id = new_register(T_LONG); 3120 __ move(new LIR_Address(osthread, in_bytes(OSThread::thread_id_offset()), T_LONG), id); 3121 __ convert(Bytecodes::_l2i, id, rlock_result(x)); 3122 } else if (thread_id_size == (size_t) BytesPerInt) { 3123 __ move(new LIR_Address(osthread, in_bytes(OSThread::thread_id_offset()), T_INT), rlock_result(x)); 3124 } else { 3125 ShouldNotReachHere(); 3126 } 3127 } 3128 3129 void LIRGenerator::do_ClassIDIntrinsic(Intrinsic* x) { 3130 CodeEmitInfo* info = state_for(x); 3131 CodeEmitInfo* info2 = new CodeEmitInfo(info); // Clone for the second null check 3132 BasicType klass_pointer_type = NOT_LP64(T_INT) LP64_ONLY(T_LONG); 3133 assert(info != NULL, "must have info"); 3134 LIRItem arg(x->argument_at(1), this); 3135 arg.load_item(); 3136 LIR_Opr klass = new_pointer_register(); 3137 __ move(new LIR_Address(arg.result(), java_lang_Class::klass_offset_in_bytes(), klass_pointer_type), klass, info); 3138 LIR_Opr id = new_register(T_LONG); 3139 ByteSize offset = TRACE_ID_OFFSET; 3140 LIR_Address* trace_id_addr = new LIR_Address(klass, in_bytes(offset), T_LONG); 3141 __ move(trace_id_addr, id); 3142 __ logical_or(id, LIR_OprFact::longConst(0x01l), id); 3143 __ store(id, trace_id_addr); 3144 __ logical_and(id, LIR_OprFact::longConst(~0x3l), id); 3145 __ move(id, rlock_result(x)); 3146 } 3147 #endif 3148 3149 void LIRGenerator::do_Intrinsic(Intrinsic* x) { 3150 switch (x->id()) { 3151 case vmIntrinsics::_intBitsToFloat : 3152 case vmIntrinsics::_doubleToRawLongBits : 3153 case vmIntrinsics::_longBitsToDouble : 3154 case vmIntrinsics::_floatToRawIntBits : { 3155 do_FPIntrinsics(x); 3156 break; 3157 } 3158 3159 #ifdef JFR_HAVE_INTRINSICS 3160 case vmIntrinsics::_getClassId: 3161 do_ClassIDIntrinsic(x); 3162 break; 3163 case vmIntrinsics::_getEventWriter: 3164 do_getEventWriter(x); 3165 break; 3166 case vmIntrinsics::_counterTime: 3167 do_RuntimeCall(CAST_FROM_FN_PTR(address, JFR_TIME_FUNCTION), 0, x); 3168 break; 3169 #endif 3170 3171 case vmIntrinsics::_currentTimeMillis: 3172 do_RuntimeCall(CAST_FROM_FN_PTR(address, os::javaTimeMillis), 0, x); 3173 break; 3174 3175 case vmIntrinsics::_nanoTime: 3176 do_RuntimeCall(CAST_FROM_FN_PTR(address, os::javaTimeNanos), 0, x); 3177 break; 3178 3179 case vmIntrinsics::_Object_init: do_RegisterFinalizer(x); break; 3180 case vmIntrinsics::_isInstance: do_isInstance(x); break; 3181 case vmIntrinsics::_getClass: do_getClass(x); break; 3182 case vmIntrinsics::_currentThread: do_currentThread(x); break; 3183 3184 case vmIntrinsics::_dlog: // fall through 3185 case vmIntrinsics::_dlog10: // fall through 3186 case vmIntrinsics::_dabs: // fall through 3187 case vmIntrinsics::_dsqrt: // fall through 3188 case vmIntrinsics::_dtan: // fall through 3189 case vmIntrinsics::_dsin : // fall through 3190 case vmIntrinsics::_dcos : // fall through 3191 case vmIntrinsics::_dexp : // fall through 3192 case vmIntrinsics::_dpow : do_MathIntrinsic(x); break; 3193 case vmIntrinsics::_arraycopy: do_ArrayCopy(x); break; 3194 3195 // java.nio.Buffer.checkIndex 3196 case vmIntrinsics::_checkIndex: do_NIOCheckIndex(x); break; 3197 3198 case vmIntrinsics::_compareAndSwapObject: 3199 do_CompareAndSwap(x, objectType); 3200 break; 3201 case vmIntrinsics::_compareAndSwapInt: 3202 do_CompareAndSwap(x, intType); 3203 break; 3204 case vmIntrinsics::_compareAndSwapLong: 3205 do_CompareAndSwap(x, longType); 3206 break; 3207 3208 case vmIntrinsics::_loadFence : 3209 if (os::is_MP()) __ membar_acquire(); 3210 break; 3211 case vmIntrinsics::_storeFence: 3212 if (os::is_MP()) __ membar_release(); 3213 break; 3214 case vmIntrinsics::_fullFence : 3215 if (os::is_MP()) __ membar(); 3216 break; 3217 3218 case vmIntrinsics::_Reference_get: 3219 do_Reference_get(x); 3220 break; 3221 3222 case vmIntrinsics::_updateCRC32: 3223 case vmIntrinsics::_updateBytesCRC32: 3224 case vmIntrinsics::_updateByteBufferCRC32: 3225 do_update_CRC32(x); 3226 break; 3227 3228 default: ShouldNotReachHere(); break; 3229 } 3230 } 3231 3232 void LIRGenerator::profile_arguments(ProfileCall* x) { 3233 if (compilation()->profile_arguments()) { 3234 int bci = x->bci_of_invoke(); 3235 ciMethodData* md = x->method()->method_data_or_null(); 3236 ciProfileData* data = md->bci_to_data(bci); 3237 if (data != NULL) { 3238 if ((data->is_CallTypeData() && data->as_CallTypeData()->has_arguments()) || 3239 (data->is_VirtualCallTypeData() && data->as_VirtualCallTypeData()->has_arguments())) { 3240 ByteSize extra = data->is_CallTypeData() ? CallTypeData::args_data_offset() : VirtualCallTypeData::args_data_offset(); 3241 int base_offset = md->byte_offset_of_slot(data, extra); 3242 LIR_Opr mdp = LIR_OprFact::illegalOpr; 3243 ciTypeStackSlotEntries* args = data->is_CallTypeData() ? ((ciCallTypeData*)data)->args() : ((ciVirtualCallTypeData*)data)->args(); 3244 3245 Bytecodes::Code bc = x->method()->java_code_at_bci(bci); 3246 int start = 0; 3247 int stop = data->is_CallTypeData() ? ((ciCallTypeData*)data)->number_of_arguments() : ((ciVirtualCallTypeData*)data)->number_of_arguments(); 3248 if (x->callee()->is_loaded() && x->callee()->is_static() && Bytecodes::has_receiver(bc)) { 3249 // first argument is not profiled at call (method handle invoke) 3250 assert(x->method()->raw_code_at_bci(bci) == Bytecodes::_invokehandle, "invokehandle expected"); 3251 start = 1; 3252 } 3253 ciSignature* callee_signature = x->callee()->signature(); 3254 // method handle call to virtual method 3255 bool has_receiver = x->callee()->is_loaded() && !x->callee()->is_static() && !Bytecodes::has_receiver(bc); 3256 ciSignatureStream callee_signature_stream(callee_signature, has_receiver ? x->callee()->holder() : NULL); 3257 3258 bool ignored_will_link; 3259 ciSignature* signature_at_call = NULL; 3260 x->method()->get_method_at_bci(bci, ignored_will_link, &signature_at_call); 3261 ciSignatureStream signature_at_call_stream(signature_at_call); 3262 3263 // if called through method handle invoke, some arguments may have been popped 3264 for (int i = 0; i < stop && i+start < x->nb_profiled_args(); i++) { 3265 int off = in_bytes(TypeEntriesAtCall::argument_type_offset(i)) - in_bytes(TypeEntriesAtCall::args_data_offset()); 3266 ciKlass* exact = profile_type(md, base_offset, off, 3267 args->type(i), x->profiled_arg_at(i+start), mdp, 3268 !x->arg_needs_null_check(i+start), 3269 signature_at_call_stream.next_klass(), callee_signature_stream.next_klass()); 3270 if (exact != NULL) { 3271 md->set_argument_type(bci, i, exact); 3272 } 3273 } 3274 } else { 3275 #ifdef ASSERT 3276 Bytecodes::Code code = x->method()->raw_code_at_bci(x->bci_of_invoke()); 3277 int n = x->nb_profiled_args(); 3278 assert(MethodData::profile_parameters() && (MethodData::profile_arguments_jsr292_only() || 3279 (x->inlined() && ((code == Bytecodes::_invokedynamic && n <= 1) || (code == Bytecodes::_invokehandle && n <= 2)))), 3280 "only at JSR292 bytecodes"); 3281 #endif 3282 } 3283 } 3284 } 3285 } 3286 3287 // profile parameters on entry to an inlined method 3288 void LIRGenerator::profile_parameters_at_call(ProfileCall* x) { 3289 if (compilation()->profile_parameters() && x->inlined()) { 3290 ciMethodData* md = x->callee()->method_data_or_null(); 3291 if (md != NULL) { 3292 ciParametersTypeData* parameters_type_data = md->parameters_type_data(); 3293 if (parameters_type_data != NULL) { 3294 ciTypeStackSlotEntries* parameters = parameters_type_data->parameters(); 3295 LIR_Opr mdp = LIR_OprFact::illegalOpr; 3296 bool has_receiver = !x->callee()->is_static(); 3297 ciSignature* sig = x->callee()->signature(); 3298 ciSignatureStream sig_stream(sig, has_receiver ? x->callee()->holder() : NULL); 3299 int i = 0; // to iterate on the Instructions 3300 Value arg = x->recv(); 3301 bool not_null = false; 3302 int bci = x->bci_of_invoke(); 3303 Bytecodes::Code bc = x->method()->java_code_at_bci(bci); 3304 // The first parameter is the receiver so that's what we start 3305 // with if it exists. One exception is method handle call to 3306 // virtual method: the receiver is in the args list 3307 if (arg == NULL || !Bytecodes::has_receiver(bc)) { 3308 i = 1; 3309 arg = x->profiled_arg_at(0); 3310 not_null = !x->arg_needs_null_check(0); 3311 } 3312 int k = 0; // to iterate on the profile data 3313 for (;;) { 3314 intptr_t profiled_k = parameters->type(k); 3315 ciKlass* exact = profile_type(md, md->byte_offset_of_slot(parameters_type_data, ParametersTypeData::type_offset(0)), 3316 in_bytes(ParametersTypeData::type_offset(k)) - in_bytes(ParametersTypeData::type_offset(0)), 3317 profiled_k, arg, mdp, not_null, sig_stream.next_klass(), NULL); 3318 // If the profile is known statically set it once for all and do not emit any code 3319 if (exact != NULL) { 3320 md->set_parameter_type(k, exact); 3321 } 3322 k++; 3323 if (k >= parameters_type_data->number_of_parameters()) { 3324 #ifdef ASSERT 3325 int extra = 0; 3326 if (MethodData::profile_arguments() && TypeProfileParmsLimit != -1 && 3327 x->nb_profiled_args() >= TypeProfileParmsLimit && 3328 x->recv() != NULL && Bytecodes::has_receiver(bc)) { 3329 extra += 1; 3330 } 3331 assert(i == x->nb_profiled_args() - extra || (TypeProfileParmsLimit != -1 && TypeProfileArgsLimit > TypeProfileParmsLimit), "unused parameters?"); 3332 #endif 3333 break; 3334 } 3335 arg = x->profiled_arg_at(i); 3336 not_null = !x->arg_needs_null_check(i); 3337 i++; 3338 } 3339 } 3340 } 3341 } 3342 } 3343 3344 void LIRGenerator::do_ProfileCall(ProfileCall* x) { 3345 // Need recv in a temporary register so it interferes with the other temporaries 3346 LIR_Opr recv = LIR_OprFact::illegalOpr; 3347 LIR_Opr mdo = new_register(T_OBJECT); 3348 // tmp is used to hold the counters on SPARC 3349 LIR_Opr tmp = new_pointer_register(); 3350 3351 if (x->nb_profiled_args() > 0) { 3352 profile_arguments(x); 3353 } 3354 3355 // profile parameters on inlined method entry including receiver 3356 if (x->recv() != NULL || x->nb_profiled_args() > 0) { 3357 profile_parameters_at_call(x); 3358 } 3359 3360 if (x->recv() != NULL) { 3361 LIRItem value(x->recv(), this); 3362 value.load_item(); 3363 recv = new_register(T_OBJECT); 3364 __ move(value.result(), recv); 3365 } 3366 __ profile_call(x->method(), x->bci_of_invoke(), x->callee(), mdo, recv, tmp, x->known_holder()); 3367 } 3368 3369 void LIRGenerator::do_ProfileReturnType(ProfileReturnType* x) { 3370 int bci = x->bci_of_invoke(); 3371 ciMethodData* md = x->method()->method_data_or_null(); 3372 ciProfileData* data = md->bci_to_data(bci); 3373 if (data != NULL) { 3374 assert(data->is_CallTypeData() || data->is_VirtualCallTypeData(), "wrong profile data type"); 3375 ciReturnTypeEntry* ret = data->is_CallTypeData() ? ((ciCallTypeData*)data)->ret() : ((ciVirtualCallTypeData*)data)->ret(); 3376 LIR_Opr mdp = LIR_OprFact::illegalOpr; 3377 3378 bool ignored_will_link; 3379 ciSignature* signature_at_call = NULL; 3380 x->method()->get_method_at_bci(bci, ignored_will_link, &signature_at_call); 3381 3382 // The offset within the MDO of the entry to update may be too large 3383 // to be used in load/store instructions on some platforms. So have 3384 // profile_type() compute the address of the profile in a register. 3385 ciKlass* exact = profile_type(md, md->byte_offset_of_slot(data, ret->type_offset()), 0, 3386 ret->type(), x->ret(), mdp, 3387 !x->needs_null_check(), 3388 signature_at_call->return_type()->as_klass(), 3389 x->callee()->signature()->return_type()->as_klass()); 3390 if (exact != NULL) { 3391 md->set_return_type(bci, exact); 3392 } 3393 } 3394 } 3395 3396 void LIRGenerator::do_ProfileInvoke(ProfileInvoke* x) { 3397 // We can safely ignore accessors here, since c2 will inline them anyway, 3398 // accessors are also always mature. 3399 if (!x->inlinee()->is_accessor()) { 3400 CodeEmitInfo* info = state_for(x, x->state(), true); 3401 // Notify the runtime very infrequently only to take care of counter overflows 3402 increment_event_counter_impl(info, x->inlinee(), (1 << Tier23InlineeNotifyFreqLog) - 1, InvocationEntryBci, false, true); 3403 } 3404 } 3405 3406 void LIRGenerator::increment_event_counter(CodeEmitInfo* info, int bci, bool backedge) { 3407 int freq_log = 0; 3408 int level = compilation()->env()->comp_level(); 3409 if (level == CompLevel_limited_profile) { 3410 freq_log = (backedge ? Tier2BackedgeNotifyFreqLog : Tier2InvokeNotifyFreqLog); 3411 } else if (level == CompLevel_full_profile) { 3412 freq_log = (backedge ? Tier3BackedgeNotifyFreqLog : Tier3InvokeNotifyFreqLog); 3413 } else { 3414 ShouldNotReachHere(); 3415 } 3416 // Increment the appropriate invocation/backedge counter and notify the runtime. 3417 increment_event_counter_impl(info, info->scope()->method(), (1 << freq_log) - 1, bci, backedge, true); 3418 } 3419 3420 void LIRGenerator::increment_event_counter_impl(CodeEmitInfo* info, 3421 ciMethod *method, int frequency, 3422 int bci, bool backedge, bool notify) { 3423 assert(frequency == 0 || is_power_of_2(frequency + 1), "Frequency must be x^2 - 1 or 0"); 3424 int level = _compilation->env()->comp_level(); 3425 assert(level > CompLevel_simple, "Shouldn't be here"); 3426 3427 int offset = -1; 3428 LIR_Opr counter_holder = NULL; 3429 if (level == CompLevel_limited_profile) { 3430 MethodCounters* counters_adr = method->ensure_method_counters(); 3431 if (counters_adr == NULL) { 3432 bailout("method counters allocation failed"); 3433 return; 3434 } 3435 counter_holder = new_pointer_register(); 3436 __ move(LIR_OprFact::intptrConst(counters_adr), counter_holder); 3437 offset = in_bytes(backedge ? MethodCounters::backedge_counter_offset() : 3438 MethodCounters::invocation_counter_offset()); 3439 } else if (level == CompLevel_full_profile) { 3440 counter_holder = new_register(T_METADATA); 3441 offset = in_bytes(backedge ? MethodData::backedge_counter_offset() : 3442 MethodData::invocation_counter_offset()); 3443 ciMethodData* md = method->method_data_or_null(); 3444 assert(md != NULL, "Sanity"); 3445 __ metadata2reg(md->constant_encoding(), counter_holder); 3446 } else { 3447 ShouldNotReachHere(); 3448 } 3449 LIR_Address* counter = new LIR_Address(counter_holder, offset, T_INT); 3450 LIR_Opr result = new_register(T_INT); 3451 __ load(counter, result); 3452 __ add(result, LIR_OprFact::intConst(InvocationCounter::count_increment), result); 3453 __ store(result, counter); 3454 if (notify) { 3455 LIR_Opr mask = load_immediate(frequency << InvocationCounter::count_shift, T_INT); 3456 LIR_Opr meth = new_register(T_METADATA); 3457 __ metadata2reg(method->constant_encoding(), meth); 3458 __ logical_and(result, mask, result); 3459 __ cmp(lir_cond_equal, result, LIR_OprFact::intConst(0)); 3460 // The bci for info can point to cmp for if's we want the if bci 3461 CodeStub* overflow = new CounterOverflowStub(info, bci, meth); 3462 __ branch(lir_cond_equal, T_INT, overflow); 3463 __ branch_destination(overflow->continuation()); 3464 } 3465 } 3466 3467 void LIRGenerator::do_RuntimeCall(RuntimeCall* x) { 3468 LIR_OprList* args = new LIR_OprList(x->number_of_arguments()); 3469 BasicTypeList* signature = new BasicTypeList(x->number_of_arguments()); 3470 3471 if (x->pass_thread()) { 3472 signature->append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread 3473 args->append(getThreadPointer()); 3474 } 3475 3476 for (int i = 0; i < x->number_of_arguments(); i++) { 3477 Value a = x->argument_at(i); 3478 LIRItem* item = new LIRItem(a, this); 3479 item->load_item(); 3480 args->append(item->result()); 3481 signature->append(as_BasicType(a->type())); 3482 } 3483 3484 LIR_Opr result = call_runtime(signature, args, x->entry(), x->type(), NULL); 3485 if (x->type() == voidType) { 3486 set_no_result(x); 3487 } else { 3488 __ move(result, rlock_result(x)); 3489 } 3490 } 3491 3492 #ifdef ASSERT 3493 void LIRGenerator::do_Assert(Assert *x) { 3494 ValueTag tag = x->x()->type()->tag(); 3495 If::Condition cond = x->cond(); 3496 3497 LIRItem xitem(x->x(), this); 3498 LIRItem yitem(x->y(), this); 3499 LIRItem* xin = &xitem; 3500 LIRItem* yin = &yitem; 3501 3502 assert(tag == intTag, "Only integer assertions are valid!"); 3503 3504 xin->load_item(); 3505 yin->dont_load_item(); 3506 3507 set_no_result(x); 3508 3509 LIR_Opr left = xin->result(); 3510 LIR_Opr right = yin->result(); 3511 3512 __ lir_assert(lir_cond(x->cond()), left, right, x->message(), true); 3513 } 3514 #endif 3515 3516 void LIRGenerator::do_RangeCheckPredicate(RangeCheckPredicate *x) { 3517 3518 3519 Instruction *a = x->x(); 3520 Instruction *b = x->y(); 3521 if (!a || StressRangeCheckElimination) { 3522 assert(!b || StressRangeCheckElimination, "B must also be null"); 3523 3524 CodeEmitInfo *info = state_for(x, x->state()); 3525 CodeStub* stub = new PredicateFailedStub(info); 3526 3527 __ jump(stub); 3528 } else if (a->type()->as_IntConstant() && b->type()->as_IntConstant()) { 3529 int a_int = a->type()->as_IntConstant()->value(); 3530 int b_int = b->type()->as_IntConstant()->value(); 3531 3532 bool ok = false; 3533 3534 switch(x->cond()) { 3535 case Instruction::eql: ok = (a_int == b_int); break; 3536 case Instruction::neq: ok = (a_int != b_int); break; 3537 case Instruction::lss: ok = (a_int < b_int); break; 3538 case Instruction::leq: ok = (a_int <= b_int); break; 3539 case Instruction::gtr: ok = (a_int > b_int); break; 3540 case Instruction::geq: ok = (a_int >= b_int); break; 3541 case Instruction::aeq: ok = ((unsigned int)a_int >= (unsigned int)b_int); break; 3542 case Instruction::beq: ok = ((unsigned int)a_int <= (unsigned int)b_int); break; 3543 default: ShouldNotReachHere(); 3544 } 3545 3546 if (ok) { 3547 3548 CodeEmitInfo *info = state_for(x, x->state()); 3549 CodeStub* stub = new PredicateFailedStub(info); 3550 3551 __ jump(stub); 3552 } 3553 } else { 3554 3555 ValueTag tag = x->x()->type()->tag(); 3556 If::Condition cond = x->cond(); 3557 LIRItem xitem(x->x(), this); 3558 LIRItem yitem(x->y(), this); 3559 LIRItem* xin = &xitem; 3560 LIRItem* yin = &yitem; 3561 3562 assert(tag == intTag, "Only integer deoptimizations are valid!"); 3563 3564 xin->load_item(); 3565 yin->dont_load_item(); 3566 set_no_result(x); 3567 3568 LIR_Opr left = xin->result(); 3569 LIR_Opr right = yin->result(); 3570 3571 CodeEmitInfo *info = state_for(x, x->state()); 3572 CodeStub* stub = new PredicateFailedStub(info); 3573 3574 __ cmp(lir_cond(cond), left, right); 3575 __ branch(lir_cond(cond), right->type(), stub); 3576 } 3577 } 3578 3579 3580 LIR_Opr LIRGenerator::call_runtime(Value arg1, address entry, ValueType* result_type, CodeEmitInfo* info) { 3581 LIRItemList args(1); 3582 LIRItem value(arg1, this); 3583 args.append(&value); 3584 BasicTypeList signature; 3585 signature.append(as_BasicType(arg1->type())); 3586 3587 return call_runtime(&signature, &args, entry, result_type, info); 3588 } 3589 3590 3591 LIR_Opr LIRGenerator::call_runtime(Value arg1, Value arg2, address entry, ValueType* result_type, CodeEmitInfo* info) { 3592 LIRItemList args(2); 3593 LIRItem value1(arg1, this); 3594 LIRItem value2(arg2, this); 3595 args.append(&value1); 3596 args.append(&value2); 3597 BasicTypeList signature; 3598 signature.append(as_BasicType(arg1->type())); 3599 signature.append(as_BasicType(arg2->type())); 3600 3601 return call_runtime(&signature, &args, entry, result_type, info); 3602 } 3603 3604 3605 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIR_OprList* args, 3606 address entry, ValueType* result_type, CodeEmitInfo* info) { 3607 // get a result register 3608 LIR_Opr phys_reg = LIR_OprFact::illegalOpr; 3609 LIR_Opr result = LIR_OprFact::illegalOpr; 3610 if (result_type->tag() != voidTag) { 3611 result = new_register(result_type); 3612 phys_reg = result_register_for(result_type); 3613 } 3614 3615 // move the arguments into the correct location 3616 CallingConvention* cc = frame_map()->c_calling_convention(signature); 3617 assert(cc->length() == args->length(), "argument mismatch"); 3618 for (int i = 0; i < args->length(); i++) { 3619 LIR_Opr arg = args->at(i); 3620 LIR_Opr loc = cc->at(i); 3621 if (loc->is_register()) { 3622 __ move(arg, loc); 3623 } else { 3624 LIR_Address* addr = loc->as_address_ptr(); 3625 // if (!can_store_as_constant(arg)) { 3626 // LIR_Opr tmp = new_register(arg->type()); 3627 // __ move(arg, tmp); 3628 // arg = tmp; 3629 // } 3630 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 3631 __ unaligned_move(arg, addr); 3632 } else { 3633 __ move(arg, addr); 3634 } 3635 } 3636 } 3637 3638 if (info) { 3639 __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info); 3640 } else { 3641 __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args()); 3642 } 3643 if (result->is_valid()) { 3644 __ move(phys_reg, result); 3645 } 3646 return result; 3647 } 3648 3649 3650 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIRItemList* args, 3651 address entry, ValueType* result_type, CodeEmitInfo* info) { 3652 // get a result register 3653 LIR_Opr phys_reg = LIR_OprFact::illegalOpr; 3654 LIR_Opr result = LIR_OprFact::illegalOpr; 3655 if (result_type->tag() != voidTag) { 3656 result = new_register(result_type); 3657 phys_reg = result_register_for(result_type); 3658 } 3659 3660 // move the arguments into the correct location 3661 CallingConvention* cc = frame_map()->c_calling_convention(signature); 3662 3663 assert(cc->length() == args->length(), "argument mismatch"); 3664 for (int i = 0; i < args->length(); i++) { 3665 LIRItem* arg = args->at(i); 3666 LIR_Opr loc = cc->at(i); 3667 if (loc->is_register()) { 3668 arg->load_item_force(loc); 3669 } else { 3670 LIR_Address* addr = loc->as_address_ptr(); 3671 arg->load_for_store(addr->type()); 3672 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 3673 __ unaligned_move(arg->result(), addr); 3674 } else { 3675 __ move(arg->result(), addr); 3676 } 3677 } 3678 } 3679 3680 if (info) { 3681 __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info); 3682 } else { 3683 __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args()); 3684 } 3685 if (result->is_valid()) { 3686 __ move(phys_reg, result); 3687 } 3688 return result; 3689 } 3690 3691 void LIRGenerator::do_MemBar(MemBar* x) { 3692 if (os::is_MP()) { 3693 LIR_Code code = x->code(); 3694 switch(code) { 3695 case lir_membar_acquire : __ membar_acquire(); break; 3696 case lir_membar_release : __ membar_release(); break; 3697 case lir_membar : __ membar(); break; 3698 case lir_membar_loadload : __ membar_loadload(); break; 3699 case lir_membar_storestore: __ membar_storestore(); break; 3700 case lir_membar_loadstore : __ membar_loadstore(); break; 3701 case lir_membar_storeload : __ membar_storeload(); break; 3702 default : ShouldNotReachHere(); break; 3703 } 3704 } 3705 } 3706 3707 LIR_Opr LIRGenerator::maybe_mask_boolean(StoreIndexed* x, LIR_Opr array, LIR_Opr value, CodeEmitInfo*& null_check_info) { 3708 if (x->check_boolean()) { 3709 LIR_Opr value_fixed = rlock_byte(T_BYTE); 3710 if (TwoOperandLIRForm) { 3711 __ move(value, value_fixed); 3712 __ logical_and(value_fixed, LIR_OprFact::intConst(1), value_fixed); 3713 } else { 3714 __ logical_and(value, LIR_OprFact::intConst(1), value_fixed); 3715 } 3716 LIR_Opr klass = new_register(T_METADATA); 3717 __ move(new LIR_Address(array, oopDesc::klass_offset_in_bytes(), T_ADDRESS), klass, null_check_info); 3718 null_check_info = NULL; 3719 LIR_Opr layout = new_register(T_INT); 3720 __ move(new LIR_Address(klass, in_bytes(Klass::layout_helper_offset()), T_INT), layout); 3721 int diffbit = Klass::layout_helper_boolean_diffbit(); 3722 __ logical_and(layout, LIR_OprFact::intConst(diffbit), layout); 3723 __ cmp(lir_cond_notEqual, layout, LIR_OprFact::intConst(0)); 3724 __ cmove(lir_cond_notEqual, value_fixed, value, value_fixed, T_BYTE); 3725 value = value_fixed; 3726 } 3727 return value; 3728 }