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