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 err_msg_res("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::CardTableModRef: 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::CardTableModRef: 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(PtrQueue::byte_width_of_active()) == 4) { 1468 flag_type = T_INT; 1469 } else { 1470 guarantee(in_bytes(PtrQueue::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 PtrQueue::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 __ move(card_addr, cur_value); 1623 1624 LabelObj* L_already_dirty = new LabelObj(); 1625 __ cmp(lir_cond_equal, cur_value, dirty); 1626 __ branch(lir_cond_equal, T_BYTE, L_already_dirty->label()); 1627 __ move(dirty, card_addr); 1628 __ branch_destination(L_already_dirty->label()); 1629 } else { 1630 __ move(dirty, card_addr); 1631 } 1632 #endif 1633 } 1634 1635 1636 //------------------------field access-------------------------------------- 1637 1638 // Comment copied form templateTable_i486.cpp 1639 // ---------------------------------------------------------------------------- 1640 // Volatile variables demand their effects be made known to all CPU's in 1641 // order. Store buffers on most chips allow reads & writes to reorder; the 1642 // JMM's ReadAfterWrite.java test fails in -Xint mode without some kind of 1643 // memory barrier (i.e., it's not sufficient that the interpreter does not 1644 // reorder volatile references, the hardware also must not reorder them). 1645 // 1646 // According to the new Java Memory Model (JMM): 1647 // (1) All volatiles are serialized wrt to each other. 1648 // ALSO reads & writes act as aquire & release, so: 1649 // (2) A read cannot let unrelated NON-volatile memory refs that happen after 1650 // the read float up to before the read. It's OK for non-volatile memory refs 1651 // that happen before the volatile read to float down below it. 1652 // (3) Similar a volatile write cannot let unrelated NON-volatile memory refs 1653 // that happen BEFORE the write float down to after the write. It's OK for 1654 // non-volatile memory refs that happen after the volatile write to float up 1655 // before it. 1656 // 1657 // We only put in barriers around volatile refs (they are expensive), not 1658 // _between_ memory refs (that would require us to track the flavor of the 1659 // previous memory refs). Requirements (2) and (3) require some barriers 1660 // before volatile stores and after volatile loads. These nearly cover 1661 // requirement (1) but miss the volatile-store-volatile-load case. This final 1662 // case is placed after volatile-stores although it could just as well go 1663 // before volatile-loads. 1664 1665 1666 void LIRGenerator::do_StoreField(StoreField* x) { 1667 bool needs_patching = x->needs_patching(); 1668 bool is_volatile = x->field()->is_volatile(); 1669 BasicType field_type = x->field_type(); 1670 bool is_oop = (field_type == T_ARRAY || field_type == T_OBJECT); 1671 1672 CodeEmitInfo* info = NULL; 1673 if (needs_patching) { 1674 assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access"); 1675 info = state_for(x, x->state_before()); 1676 } else if (x->needs_null_check()) { 1677 NullCheck* nc = x->explicit_null_check(); 1678 if (nc == NULL) { 1679 info = state_for(x); 1680 } else { 1681 info = state_for(nc); 1682 } 1683 } 1684 1685 1686 LIRItem object(x->obj(), this); 1687 LIRItem value(x->value(), this); 1688 1689 object.load_item(); 1690 1691 if (is_volatile || needs_patching) { 1692 // load item if field is volatile (fewer special cases for volatiles) 1693 // load item if field not initialized 1694 // load item if field not constant 1695 // because of code patching we cannot inline constants 1696 if (field_type == T_BYTE || field_type == T_BOOLEAN) { 1697 value.load_byte_item(); 1698 } else { 1699 value.load_item(); 1700 } 1701 } else { 1702 value.load_for_store(field_type); 1703 } 1704 1705 set_no_result(x); 1706 1707 #ifndef PRODUCT 1708 if (PrintNotLoaded && needs_patching) { 1709 tty->print_cr(" ###class not loaded at store_%s bci %d", 1710 x->is_static() ? "static" : "field", x->printable_bci()); 1711 } 1712 #endif 1713 1714 if (x->needs_null_check() && 1715 (needs_patching || 1716 MacroAssembler::needs_explicit_null_check(x->offset()))) { 1717 // emit an explicit null check because the offset is too large 1718 __ null_check(object.result(), new CodeEmitInfo(info)); 1719 } 1720 1721 LIR_Address* address; 1722 if (needs_patching) { 1723 // we need to patch the offset in the instruction so don't allow 1724 // generate_address to try to be smart about emitting the -1. 1725 // Otherwise the patching code won't know how to find the 1726 // instruction to patch. 1727 address = new LIR_Address(object.result(), PATCHED_ADDR, field_type); 1728 } else { 1729 address = generate_address(object.result(), x->offset(), field_type); 1730 } 1731 1732 if (is_volatile && os::is_MP()) { 1733 __ membar_release(); 1734 } 1735 1736 if (is_oop) { 1737 // Do the pre-write barrier, if any. 1738 pre_barrier(LIR_OprFact::address(address), 1739 LIR_OprFact::illegalOpr /* pre_val */, 1740 true /* do_load*/, 1741 needs_patching, 1742 (info ? new CodeEmitInfo(info) : NULL)); 1743 } 1744 1745 bool needs_atomic_access = is_volatile || AlwaysAtomicAccesses; 1746 if (needs_atomic_access && !needs_patching) { 1747 volatile_field_store(value.result(), address, info); 1748 } else { 1749 LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none; 1750 __ store(value.result(), address, info, patch_code); 1751 } 1752 1753 if (is_oop) { 1754 // Store to object so mark the card of the header 1755 post_barrier(object.result(), value.result()); 1756 } 1757 1758 if (is_volatile && os::is_MP()) { 1759 __ membar(); 1760 } 1761 } 1762 1763 1764 void LIRGenerator::do_LoadField(LoadField* x) { 1765 bool needs_patching = x->needs_patching(); 1766 bool is_volatile = x->field()->is_volatile(); 1767 BasicType field_type = x->field_type(); 1768 1769 CodeEmitInfo* info = NULL; 1770 if (needs_patching) { 1771 assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access"); 1772 info = state_for(x, x->state_before()); 1773 } else if (x->needs_null_check()) { 1774 NullCheck* nc = x->explicit_null_check(); 1775 if (nc == NULL) { 1776 info = state_for(x); 1777 } else { 1778 info = state_for(nc); 1779 } 1780 } 1781 1782 LIRItem object(x->obj(), this); 1783 1784 object.load_item(); 1785 1786 #ifndef PRODUCT 1787 if (PrintNotLoaded && needs_patching) { 1788 tty->print_cr(" ###class not loaded at load_%s bci %d", 1789 x->is_static() ? "static" : "field", x->printable_bci()); 1790 } 1791 #endif 1792 1793 bool stress_deopt = StressLoopInvariantCodeMotion && info && info->deoptimize_on_exception(); 1794 if (x->needs_null_check() && 1795 (needs_patching || 1796 MacroAssembler::needs_explicit_null_check(x->offset()) || 1797 stress_deopt)) { 1798 LIR_Opr obj = object.result(); 1799 if (stress_deopt) { 1800 obj = new_register(T_OBJECT); 1801 __ move(LIR_OprFact::oopConst(NULL), obj); 1802 } 1803 // emit an explicit null check because the offset is too large 1804 __ null_check(obj, new CodeEmitInfo(info)); 1805 } 1806 1807 LIR_Opr reg = rlock_result(x, field_type); 1808 LIR_Address* address; 1809 if (needs_patching) { 1810 // we need to patch the offset in the instruction so don't allow 1811 // generate_address to try to be smart about emitting the -1. 1812 // Otherwise the patching code won't know how to find the 1813 // instruction to patch. 1814 address = new LIR_Address(object.result(), PATCHED_ADDR, field_type); 1815 } else { 1816 address = generate_address(object.result(), x->offset(), field_type); 1817 } 1818 1819 bool needs_atomic_access = is_volatile || AlwaysAtomicAccesses; 1820 if (needs_atomic_access && !needs_patching) { 1821 volatile_field_load(address, reg, info); 1822 } else { 1823 LIR_PatchCode patch_code = needs_patching ? lir_patch_normal : lir_patch_none; 1824 __ load(address, reg, info, patch_code); 1825 } 1826 1827 if (is_volatile && os::is_MP()) { 1828 __ membar_acquire(); 1829 } 1830 } 1831 1832 1833 //------------------------java.nio.Buffer.checkIndex------------------------ 1834 1835 // int java.nio.Buffer.checkIndex(int) 1836 void LIRGenerator::do_NIOCheckIndex(Intrinsic* x) { 1837 // NOTE: by the time we are in checkIndex() we are guaranteed that 1838 // the buffer is non-null (because checkIndex is package-private and 1839 // only called from within other methods in the buffer). 1840 assert(x->number_of_arguments() == 2, "wrong type"); 1841 LIRItem buf (x->argument_at(0), this); 1842 LIRItem index(x->argument_at(1), this); 1843 buf.load_item(); 1844 index.load_item(); 1845 1846 LIR_Opr result = rlock_result(x); 1847 if (GenerateRangeChecks) { 1848 CodeEmitInfo* info = state_for(x); 1849 CodeStub* stub = new RangeCheckStub(info, index.result(), true); 1850 if (index.result()->is_constant()) { 1851 cmp_mem_int(lir_cond_belowEqual, buf.result(), java_nio_Buffer::limit_offset(), index.result()->as_jint(), info); 1852 __ branch(lir_cond_belowEqual, T_INT, stub); 1853 } else { 1854 cmp_reg_mem(lir_cond_aboveEqual, index.result(), buf.result(), 1855 java_nio_Buffer::limit_offset(), T_INT, info); 1856 __ branch(lir_cond_aboveEqual, T_INT, stub); 1857 } 1858 __ move(index.result(), result); 1859 } else { 1860 // Just load the index into the result register 1861 __ move(index.result(), result); 1862 } 1863 } 1864 1865 1866 //------------------------array access-------------------------------------- 1867 1868 1869 void LIRGenerator::do_ArrayLength(ArrayLength* x) { 1870 LIRItem array(x->array(), this); 1871 array.load_item(); 1872 LIR_Opr reg = rlock_result(x); 1873 1874 CodeEmitInfo* info = NULL; 1875 if (x->needs_null_check()) { 1876 NullCheck* nc = x->explicit_null_check(); 1877 if (nc == NULL) { 1878 info = state_for(x); 1879 } else { 1880 info = state_for(nc); 1881 } 1882 if (StressLoopInvariantCodeMotion && info->deoptimize_on_exception()) { 1883 LIR_Opr obj = new_register(T_OBJECT); 1884 __ move(LIR_OprFact::oopConst(NULL), obj); 1885 __ null_check(obj, new CodeEmitInfo(info)); 1886 } 1887 } 1888 __ load(new LIR_Address(array.result(), arrayOopDesc::length_offset_in_bytes(), T_INT), reg, info, lir_patch_none); 1889 } 1890 1891 1892 void LIRGenerator::do_LoadIndexed(LoadIndexed* x) { 1893 bool use_length = x->length() != NULL; 1894 LIRItem array(x->array(), this); 1895 LIRItem index(x->index(), this); 1896 LIRItem length(this); 1897 bool needs_range_check = x->compute_needs_range_check(); 1898 1899 if (use_length && needs_range_check) { 1900 length.set_instruction(x->length()); 1901 length.load_item(); 1902 } 1903 1904 array.load_item(); 1905 if (index.is_constant() && can_inline_as_constant(x->index())) { 1906 // let it be a constant 1907 index.dont_load_item(); 1908 } else { 1909 index.load_item(); 1910 } 1911 1912 CodeEmitInfo* range_check_info = state_for(x); 1913 CodeEmitInfo* null_check_info = NULL; 1914 if (x->needs_null_check()) { 1915 NullCheck* nc = x->explicit_null_check(); 1916 if (nc != NULL) { 1917 null_check_info = state_for(nc); 1918 } else { 1919 null_check_info = range_check_info; 1920 } 1921 if (StressLoopInvariantCodeMotion && null_check_info->deoptimize_on_exception()) { 1922 LIR_Opr obj = new_register(T_OBJECT); 1923 __ move(LIR_OprFact::oopConst(NULL), obj); 1924 __ null_check(obj, new CodeEmitInfo(null_check_info)); 1925 } 1926 } 1927 1928 // emit array address setup early so it schedules better 1929 LIR_Address* array_addr = emit_array_address(array.result(), index.result(), x->elt_type(), false); 1930 1931 if (GenerateRangeChecks && needs_range_check) { 1932 if (StressLoopInvariantCodeMotion && range_check_info->deoptimize_on_exception()) { 1933 __ branch(lir_cond_always, T_ILLEGAL, new RangeCheckStub(range_check_info, index.result())); 1934 } else if (use_length) { 1935 // TODO: use a (modified) version of array_range_check that does not require a 1936 // constant length to be loaded to a register 1937 __ cmp(lir_cond_belowEqual, length.result(), index.result()); 1938 __ branch(lir_cond_belowEqual, T_INT, new RangeCheckStub(range_check_info, index.result())); 1939 } else { 1940 array_range_check(array.result(), index.result(), null_check_info, range_check_info); 1941 // The range check performs the null check, so clear it out for the load 1942 null_check_info = NULL; 1943 } 1944 } 1945 1946 __ move(array_addr, rlock_result(x, x->elt_type()), null_check_info); 1947 } 1948 1949 1950 void LIRGenerator::do_NullCheck(NullCheck* x) { 1951 if (x->can_trap()) { 1952 LIRItem value(x->obj(), this); 1953 value.load_item(); 1954 CodeEmitInfo* info = state_for(x); 1955 __ null_check(value.result(), info); 1956 } 1957 } 1958 1959 1960 void LIRGenerator::do_TypeCast(TypeCast* x) { 1961 LIRItem value(x->obj(), this); 1962 value.load_item(); 1963 // the result is the same as from the node we are casting 1964 set_result(x, value.result()); 1965 } 1966 1967 1968 void LIRGenerator::do_Throw(Throw* x) { 1969 LIRItem exception(x->exception(), this); 1970 exception.load_item(); 1971 set_no_result(x); 1972 LIR_Opr exception_opr = exception.result(); 1973 CodeEmitInfo* info = state_for(x, x->state()); 1974 1975 #ifndef PRODUCT 1976 if (PrintC1Statistics) { 1977 increment_counter(Runtime1::throw_count_address(), T_INT); 1978 } 1979 #endif 1980 1981 // check if the instruction has an xhandler in any of the nested scopes 1982 bool unwind = false; 1983 if (info->exception_handlers()->length() == 0) { 1984 // this throw is not inside an xhandler 1985 unwind = true; 1986 } else { 1987 // get some idea of the throw type 1988 bool type_is_exact = true; 1989 ciType* throw_type = x->exception()->exact_type(); 1990 if (throw_type == NULL) { 1991 type_is_exact = false; 1992 throw_type = x->exception()->declared_type(); 1993 } 1994 if (throw_type != NULL && throw_type->is_instance_klass()) { 1995 ciInstanceKlass* throw_klass = (ciInstanceKlass*)throw_type; 1996 unwind = !x->exception_handlers()->could_catch(throw_klass, type_is_exact); 1997 } 1998 } 1999 2000 // do null check before moving exception oop into fixed register 2001 // to avoid a fixed interval with an oop during the null check. 2002 // Use a copy of the CodeEmitInfo because debug information is 2003 // different for null_check and throw. 2004 if (GenerateCompilerNullChecks && 2005 (x->exception()->as_NewInstance() == NULL && x->exception()->as_ExceptionObject() == NULL)) { 2006 // if the exception object wasn't created using new then it might be null. 2007 __ null_check(exception_opr, new CodeEmitInfo(info, x->state()->copy(ValueStack::ExceptionState, x->state()->bci()))); 2008 } 2009 2010 if (compilation()->env()->jvmti_can_post_on_exceptions()) { 2011 // we need to go through the exception lookup path to get JVMTI 2012 // notification done 2013 unwind = false; 2014 } 2015 2016 // move exception oop into fixed register 2017 __ move(exception_opr, exceptionOopOpr()); 2018 2019 if (unwind) { 2020 __ unwind_exception(exceptionOopOpr()); 2021 } else { 2022 __ throw_exception(exceptionPcOpr(), exceptionOopOpr(), info); 2023 } 2024 } 2025 2026 2027 void LIRGenerator::do_RoundFP(RoundFP* x) { 2028 LIRItem input(x->input(), this); 2029 input.load_item(); 2030 LIR_Opr input_opr = input.result(); 2031 assert(input_opr->is_register(), "why round if value is not in a register?"); 2032 assert(input_opr->is_single_fpu() || input_opr->is_double_fpu(), "input should be floating-point value"); 2033 if (input_opr->is_single_fpu()) { 2034 set_result(x, round_item(input_opr)); // This code path not currently taken 2035 } else { 2036 LIR_Opr result = new_register(T_DOUBLE); 2037 set_vreg_flag(result, must_start_in_memory); 2038 __ roundfp(input_opr, LIR_OprFact::illegalOpr, result); 2039 set_result(x, result); 2040 } 2041 } 2042 2043 // Here UnsafeGetRaw may have x->base() and x->index() be int or long 2044 // on both 64 and 32 bits. Expecting x->base() to be always long on 64bit. 2045 void LIRGenerator::do_UnsafeGetRaw(UnsafeGetRaw* x) { 2046 LIRItem base(x->base(), this); 2047 LIRItem idx(this); 2048 2049 base.load_item(); 2050 if (x->has_index()) { 2051 idx.set_instruction(x->index()); 2052 idx.load_nonconstant(); 2053 } 2054 2055 LIR_Opr reg = rlock_result(x, x->basic_type()); 2056 2057 int log2_scale = 0; 2058 if (x->has_index()) { 2059 log2_scale = x->log2_scale(); 2060 } 2061 2062 assert(!x->has_index() || idx.value() == x->index(), "should match"); 2063 2064 LIR_Opr base_op = base.result(); 2065 LIR_Opr index_op = idx.result(); 2066 #ifndef _LP64 2067 if (base_op->type() == T_LONG) { 2068 base_op = new_register(T_INT); 2069 __ convert(Bytecodes::_l2i, base.result(), base_op); 2070 } 2071 if (x->has_index()) { 2072 if (index_op->type() == T_LONG) { 2073 LIR_Opr long_index_op = index_op; 2074 if (index_op->is_constant()) { 2075 long_index_op = new_register(T_LONG); 2076 __ move(index_op, long_index_op); 2077 } 2078 index_op = new_register(T_INT); 2079 __ convert(Bytecodes::_l2i, long_index_op, index_op); 2080 } else { 2081 assert(x->index()->type()->tag() == intTag, "must be"); 2082 } 2083 } 2084 // At this point base and index should be all ints. 2085 assert(base_op->type() == T_INT && !base_op->is_constant(), "base should be an non-constant int"); 2086 assert(!x->has_index() || index_op->type() == T_INT, "index should be an int"); 2087 #else 2088 if (x->has_index()) { 2089 if (index_op->type() == T_INT) { 2090 if (!index_op->is_constant()) { 2091 index_op = new_register(T_LONG); 2092 __ convert(Bytecodes::_i2l, idx.result(), index_op); 2093 } 2094 } else { 2095 assert(index_op->type() == T_LONG, "must be"); 2096 if (index_op->is_constant()) { 2097 index_op = new_register(T_LONG); 2098 __ move(idx.result(), index_op); 2099 } 2100 } 2101 } 2102 // At this point base is a long non-constant 2103 // Index is a long register or a int constant. 2104 // We allow the constant to stay an int because that would allow us a more compact encoding by 2105 // embedding an immediate offset in the address expression. If we have a long constant, we have to 2106 // move it into a register first. 2107 assert(base_op->type() == T_LONG && !base_op->is_constant(), "base must be a long non-constant"); 2108 assert(!x->has_index() || (index_op->type() == T_INT && index_op->is_constant()) || 2109 (index_op->type() == T_LONG && !index_op->is_constant()), "unexpected index type"); 2110 #endif 2111 2112 BasicType dst_type = x->basic_type(); 2113 2114 LIR_Address* addr; 2115 if (index_op->is_constant()) { 2116 assert(log2_scale == 0, "must not have a scale"); 2117 assert(index_op->type() == T_INT, "only int constants supported"); 2118 addr = new LIR_Address(base_op, index_op->as_jint(), dst_type); 2119 } else { 2120 #ifdef X86 2121 addr = new LIR_Address(base_op, index_op, LIR_Address::Scale(log2_scale), 0, dst_type); 2122 #elif defined(GENERATE_ADDRESS_IS_PREFERRED) 2123 addr = generate_address(base_op, index_op, log2_scale, 0, dst_type); 2124 #else 2125 if (index_op->is_illegal() || log2_scale == 0) { 2126 addr = new LIR_Address(base_op, index_op, dst_type); 2127 } else { 2128 LIR_Opr tmp = new_pointer_register(); 2129 __ shift_left(index_op, log2_scale, tmp); 2130 addr = new LIR_Address(base_op, tmp, dst_type); 2131 } 2132 #endif 2133 } 2134 2135 if (x->may_be_unaligned() && (dst_type == T_LONG || dst_type == T_DOUBLE)) { 2136 __ unaligned_move(addr, reg); 2137 } else { 2138 if (dst_type == T_OBJECT && x->is_wide()) { 2139 __ move_wide(addr, reg); 2140 } else { 2141 __ move(addr, reg); 2142 } 2143 } 2144 } 2145 2146 2147 void LIRGenerator::do_UnsafePutRaw(UnsafePutRaw* x) { 2148 int log2_scale = 0; 2149 BasicType type = x->basic_type(); 2150 2151 if (x->has_index()) { 2152 log2_scale = x->log2_scale(); 2153 } 2154 2155 LIRItem base(x->base(), this); 2156 LIRItem value(x->value(), this); 2157 LIRItem idx(this); 2158 2159 base.load_item(); 2160 if (x->has_index()) { 2161 idx.set_instruction(x->index()); 2162 idx.load_item(); 2163 } 2164 2165 if (type == T_BYTE || type == T_BOOLEAN) { 2166 value.load_byte_item(); 2167 } else { 2168 value.load_item(); 2169 } 2170 2171 set_no_result(x); 2172 2173 LIR_Opr base_op = base.result(); 2174 LIR_Opr index_op = idx.result(); 2175 2176 #ifdef GENERATE_ADDRESS_IS_PREFERRED 2177 LIR_Address* addr = generate_address(base_op, index_op, log2_scale, 0, x->basic_type()); 2178 #else 2179 #ifndef _LP64 2180 if (base_op->type() == T_LONG) { 2181 base_op = new_register(T_INT); 2182 __ convert(Bytecodes::_l2i, base.result(), base_op); 2183 } 2184 if (x->has_index()) { 2185 if (index_op->type() == T_LONG) { 2186 index_op = new_register(T_INT); 2187 __ convert(Bytecodes::_l2i, idx.result(), index_op); 2188 } 2189 } 2190 // At this point base and index should be all ints and not constants 2191 assert(base_op->type() == T_INT && !base_op->is_constant(), "base should be an non-constant int"); 2192 assert(!x->has_index() || (index_op->type() == T_INT && !index_op->is_constant()), "index should be an non-constant int"); 2193 #else 2194 if (x->has_index()) { 2195 if (index_op->type() == T_INT) { 2196 index_op = new_register(T_LONG); 2197 __ convert(Bytecodes::_i2l, idx.result(), index_op); 2198 } 2199 } 2200 // At this point base and index are long and non-constant 2201 assert(base_op->type() == T_LONG && !base_op->is_constant(), "base must be a non-constant long"); 2202 assert(!x->has_index() || (index_op->type() == T_LONG && !index_op->is_constant()), "index must be a non-constant long"); 2203 #endif 2204 2205 if (log2_scale != 0) { 2206 // temporary fix (platform dependent code without shift on Intel would be better) 2207 // TODO: ARM also allows embedded shift in the address 2208 __ shift_left(index_op, log2_scale, index_op); 2209 } 2210 2211 LIR_Address* addr = new LIR_Address(base_op, index_op, x->basic_type()); 2212 #endif // !GENERATE_ADDRESS_IS_PREFERRED 2213 __ move(value.result(), addr); 2214 } 2215 2216 2217 void LIRGenerator::do_UnsafeGetObject(UnsafeGetObject* x) { 2218 BasicType type = x->basic_type(); 2219 LIRItem src(x->object(), this); 2220 LIRItem off(x->offset(), this); 2221 2222 off.load_item(); 2223 src.load_item(); 2224 2225 LIR_Opr value = rlock_result(x, x->basic_type()); 2226 2227 get_Object_unsafe(value, src.result(), off.result(), type, x->is_volatile()); 2228 2229 #if INCLUDE_ALL_GCS 2230 // We might be reading the value of the referent field of a 2231 // Reference object in order to attach it back to the live 2232 // object graph. If G1 is enabled then we need to record 2233 // the value that is being returned in an SATB log buffer. 2234 // 2235 // We need to generate code similar to the following... 2236 // 2237 // if (offset == java_lang_ref_Reference::referent_offset) { 2238 // if (src != NULL) { 2239 // if (klass(src)->reference_type() != REF_NONE) { 2240 // pre_barrier(..., value, ...); 2241 // } 2242 // } 2243 // } 2244 2245 if (UseG1GC && type == T_OBJECT) { 2246 bool gen_pre_barrier = true; // Assume we need to generate pre_barrier. 2247 bool gen_offset_check = true; // Assume we need to generate the offset guard. 2248 bool gen_source_check = true; // Assume we need to check the src object for null. 2249 bool gen_type_check = true; // Assume we need to check the reference_type. 2250 2251 if (off.is_constant()) { 2252 jlong off_con = (off.type()->is_int() ? 2253 (jlong) off.get_jint_constant() : 2254 off.get_jlong_constant()); 2255 2256 2257 if (off_con != (jlong) java_lang_ref_Reference::referent_offset) { 2258 // The constant offset is something other than referent_offset. 2259 // We can skip generating/checking the remaining guards and 2260 // skip generation of the code stub. 2261 gen_pre_barrier = false; 2262 } else { 2263 // The constant offset is the same as referent_offset - 2264 // we do not need to generate a runtime offset check. 2265 gen_offset_check = false; 2266 } 2267 } 2268 2269 // We don't need to generate stub if the source object is an array 2270 if (gen_pre_barrier && src.type()->is_array()) { 2271 gen_pre_barrier = false; 2272 } 2273 2274 if (gen_pre_barrier) { 2275 // We still need to continue with the checks. 2276 if (src.is_constant()) { 2277 ciObject* src_con = src.get_jobject_constant(); 2278 guarantee(src_con != NULL, "no source constant"); 2279 2280 if (src_con->is_null_object()) { 2281 // The constant src object is null - We can skip 2282 // generating the code stub. 2283 gen_pre_barrier = false; 2284 } else { 2285 // Non-null constant source object. We still have to generate 2286 // the slow stub - but we don't need to generate the runtime 2287 // null object check. 2288 gen_source_check = false; 2289 } 2290 } 2291 } 2292 if (gen_pre_barrier && !PatchALot) { 2293 // Can the klass of object be statically determined to be 2294 // a sub-class of Reference? 2295 ciType* type = src.value()->declared_type(); 2296 if ((type != NULL) && type->is_loaded()) { 2297 if (type->is_subtype_of(compilation()->env()->Reference_klass())) { 2298 gen_type_check = false; 2299 } else if (type->is_klass() && 2300 !compilation()->env()->Object_klass()->is_subtype_of(type->as_klass())) { 2301 // Not Reference and not Object klass. 2302 gen_pre_barrier = false; 2303 } 2304 } 2305 } 2306 2307 if (gen_pre_barrier) { 2308 LabelObj* Lcont = new LabelObj(); 2309 2310 // We can have generate one runtime check here. Let's start with 2311 // the offset check. 2312 if (gen_offset_check) { 2313 // if (offset != referent_offset) -> continue 2314 // If offset is an int then we can do the comparison with the 2315 // referent_offset constant; otherwise we need to move 2316 // referent_offset into a temporary register and generate 2317 // a reg-reg compare. 2318 2319 LIR_Opr referent_off; 2320 2321 if (off.type()->is_int()) { 2322 referent_off = LIR_OprFact::intConst(java_lang_ref_Reference::referent_offset); 2323 } else { 2324 assert(off.type()->is_long(), "what else?"); 2325 referent_off = new_register(T_LONG); 2326 __ move(LIR_OprFact::longConst(java_lang_ref_Reference::referent_offset), referent_off); 2327 } 2328 __ cmp(lir_cond_notEqual, off.result(), referent_off); 2329 __ branch(lir_cond_notEqual, as_BasicType(off.type()), Lcont->label()); 2330 } 2331 if (gen_source_check) { 2332 // offset is a const and equals referent offset 2333 // if (source == null) -> continue 2334 __ cmp(lir_cond_equal, src.result(), LIR_OprFact::oopConst(NULL)); 2335 __ branch(lir_cond_equal, T_OBJECT, Lcont->label()); 2336 } 2337 LIR_Opr src_klass = new_register(T_OBJECT); 2338 if (gen_type_check) { 2339 // We have determined that offset == referent_offset && src != null. 2340 // if (src->_klass->_reference_type == REF_NONE) -> continue 2341 __ move(new LIR_Address(src.result(), oopDesc::klass_offset_in_bytes(), T_ADDRESS), src_klass); 2342 LIR_Address* reference_type_addr = new LIR_Address(src_klass, in_bytes(InstanceKlass::reference_type_offset()), T_BYTE); 2343 LIR_Opr reference_type = new_register(T_INT); 2344 __ move(reference_type_addr, reference_type); 2345 __ cmp(lir_cond_equal, reference_type, LIR_OprFact::intConst(REF_NONE)); 2346 __ branch(lir_cond_equal, T_INT, Lcont->label()); 2347 } 2348 { 2349 // We have determined that src->_klass->_reference_type != REF_NONE 2350 // so register the value in the referent field with the pre-barrier. 2351 pre_barrier(LIR_OprFact::illegalOpr /* addr_opr */, 2352 value /* pre_val */, 2353 false /* do_load */, 2354 false /* patch */, 2355 NULL /* info */); 2356 } 2357 __ branch_destination(Lcont->label()); 2358 } 2359 } 2360 #endif // INCLUDE_ALL_GCS 2361 2362 if (x->is_volatile() && os::is_MP()) __ membar_acquire(); 2363 } 2364 2365 2366 void LIRGenerator::do_UnsafePutObject(UnsafePutObject* x) { 2367 BasicType type = x->basic_type(); 2368 LIRItem src(x->object(), this); 2369 LIRItem off(x->offset(), this); 2370 LIRItem data(x->value(), this); 2371 2372 src.load_item(); 2373 if (type == T_BOOLEAN || type == T_BYTE) { 2374 data.load_byte_item(); 2375 } else { 2376 data.load_item(); 2377 } 2378 off.load_item(); 2379 2380 set_no_result(x); 2381 2382 if (x->is_volatile() && os::is_MP()) __ membar_release(); 2383 put_Object_unsafe(src.result(), off.result(), data.result(), type, x->is_volatile()); 2384 if (x->is_volatile() && os::is_MP()) __ membar(); 2385 } 2386 2387 2388 void LIRGenerator::do_SwitchRanges(SwitchRangeArray* x, LIR_Opr value, BlockBegin* default_sux) { 2389 int lng = x->length(); 2390 2391 for (int i = 0; i < lng; i++) { 2392 SwitchRange* one_range = x->at(i); 2393 int low_key = one_range->low_key(); 2394 int high_key = one_range->high_key(); 2395 BlockBegin* dest = one_range->sux(); 2396 if (low_key == high_key) { 2397 __ cmp(lir_cond_equal, value, low_key); 2398 __ branch(lir_cond_equal, T_INT, dest); 2399 } else if (high_key - low_key == 1) { 2400 __ cmp(lir_cond_equal, value, low_key); 2401 __ branch(lir_cond_equal, T_INT, dest); 2402 __ cmp(lir_cond_equal, value, high_key); 2403 __ branch(lir_cond_equal, T_INT, dest); 2404 } else { 2405 LabelObj* L = new LabelObj(); 2406 __ cmp(lir_cond_less, value, low_key); 2407 __ branch(lir_cond_less, T_INT, L->label()); 2408 __ cmp(lir_cond_lessEqual, value, high_key); 2409 __ branch(lir_cond_lessEqual, T_INT, dest); 2410 __ branch_destination(L->label()); 2411 } 2412 } 2413 __ jump(default_sux); 2414 } 2415 2416 2417 SwitchRangeArray* LIRGenerator::create_lookup_ranges(TableSwitch* x) { 2418 SwitchRangeList* res = new SwitchRangeList(); 2419 int len = x->length(); 2420 if (len > 0) { 2421 BlockBegin* sux = x->sux_at(0); 2422 int key = x->lo_key(); 2423 BlockBegin* default_sux = x->default_sux(); 2424 SwitchRange* range = new SwitchRange(key, sux); 2425 for (int i = 0; i < len; i++, key++) { 2426 BlockBegin* new_sux = x->sux_at(i); 2427 if (sux == new_sux) { 2428 // still in same range 2429 range->set_high_key(key); 2430 } else { 2431 // skip tests which explicitly dispatch to the default 2432 if (sux != default_sux) { 2433 res->append(range); 2434 } 2435 range = new SwitchRange(key, new_sux); 2436 } 2437 sux = new_sux; 2438 } 2439 if (res->length() == 0 || res->last() != range) res->append(range); 2440 } 2441 return res; 2442 } 2443 2444 2445 // we expect the keys to be sorted by increasing value 2446 SwitchRangeArray* LIRGenerator::create_lookup_ranges(LookupSwitch* x) { 2447 SwitchRangeList* res = new SwitchRangeList(); 2448 int len = x->length(); 2449 if (len > 0) { 2450 BlockBegin* default_sux = x->default_sux(); 2451 int key = x->key_at(0); 2452 BlockBegin* sux = x->sux_at(0); 2453 SwitchRange* range = new SwitchRange(key, sux); 2454 for (int i = 1; i < len; i++) { 2455 int new_key = x->key_at(i); 2456 BlockBegin* new_sux = x->sux_at(i); 2457 if (key+1 == new_key && sux == new_sux) { 2458 // still in same range 2459 range->set_high_key(new_key); 2460 } else { 2461 // skip tests which explicitly dispatch to the default 2462 if (range->sux() != default_sux) { 2463 res->append(range); 2464 } 2465 range = new SwitchRange(new_key, new_sux); 2466 } 2467 key = new_key; 2468 sux = new_sux; 2469 } 2470 if (res->length() == 0 || res->last() != range) res->append(range); 2471 } 2472 return res; 2473 } 2474 2475 2476 void LIRGenerator::do_TableSwitch(TableSwitch* x) { 2477 LIRItem tag(x->tag(), this); 2478 tag.load_item(); 2479 set_no_result(x); 2480 2481 if (x->is_safepoint()) { 2482 __ safepoint(safepoint_poll_register(), state_for(x, x->state_before())); 2483 } 2484 2485 // move values into phi locations 2486 move_to_phi(x->state()); 2487 2488 int lo_key = x->lo_key(); 2489 int hi_key = x->hi_key(); 2490 int len = x->length(); 2491 LIR_Opr value = tag.result(); 2492 if (UseTableRanges) { 2493 do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux()); 2494 } else { 2495 for (int i = 0; i < len; i++) { 2496 __ cmp(lir_cond_equal, value, i + lo_key); 2497 __ branch(lir_cond_equal, T_INT, x->sux_at(i)); 2498 } 2499 __ jump(x->default_sux()); 2500 } 2501 } 2502 2503 2504 void LIRGenerator::do_LookupSwitch(LookupSwitch* x) { 2505 LIRItem tag(x->tag(), this); 2506 tag.load_item(); 2507 set_no_result(x); 2508 2509 if (x->is_safepoint()) { 2510 __ safepoint(safepoint_poll_register(), state_for(x, x->state_before())); 2511 } 2512 2513 // move values into phi locations 2514 move_to_phi(x->state()); 2515 2516 LIR_Opr value = tag.result(); 2517 if (UseTableRanges) { 2518 do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux()); 2519 } else { 2520 int len = x->length(); 2521 for (int i = 0; i < len; i++) { 2522 __ cmp(lir_cond_equal, value, x->key_at(i)); 2523 __ branch(lir_cond_equal, T_INT, x->sux_at(i)); 2524 } 2525 __ jump(x->default_sux()); 2526 } 2527 } 2528 2529 2530 void LIRGenerator::do_Goto(Goto* x) { 2531 set_no_result(x); 2532 2533 if (block()->next()->as_OsrEntry()) { 2534 // need to free up storage used for OSR entry point 2535 LIR_Opr osrBuffer = block()->next()->operand(); 2536 BasicTypeList signature; 2537 signature.append(NOT_LP64(T_INT) LP64_ONLY(T_LONG)); // pass a pointer to osrBuffer 2538 CallingConvention* cc = frame_map()->c_calling_convention(&signature); 2539 __ move(osrBuffer, cc->args()->at(0)); 2540 __ call_runtime_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end), 2541 getThreadTemp(), LIR_OprFact::illegalOpr, cc->args()); 2542 } 2543 2544 if (x->is_safepoint()) { 2545 ValueStack* state = x->state_before() ? x->state_before() : x->state(); 2546 2547 // increment backedge counter if needed 2548 CodeEmitInfo* info = state_for(x, state); 2549 increment_backedge_counter(info, x->profiled_bci()); 2550 CodeEmitInfo* safepoint_info = state_for(x, state); 2551 __ safepoint(safepoint_poll_register(), safepoint_info); 2552 } 2553 2554 // Gotos can be folded Ifs, handle this case. 2555 if (x->should_profile()) { 2556 ciMethod* method = x->profiled_method(); 2557 assert(method != NULL, "method should be set if branch is profiled"); 2558 ciMethodData* md = method->method_data_or_null(); 2559 assert(md != NULL, "Sanity"); 2560 ciProfileData* data = md->bci_to_data(x->profiled_bci()); 2561 assert(data != NULL, "must have profiling data"); 2562 int offset; 2563 if (x->direction() == Goto::taken) { 2564 assert(data->is_BranchData(), "need BranchData for two-way branches"); 2565 offset = md->byte_offset_of_slot(data, BranchData::taken_offset()); 2566 } else if (x->direction() == Goto::not_taken) { 2567 assert(data->is_BranchData(), "need BranchData for two-way branches"); 2568 offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset()); 2569 } else { 2570 assert(data->is_JumpData(), "need JumpData for branches"); 2571 offset = md->byte_offset_of_slot(data, JumpData::taken_offset()); 2572 } 2573 LIR_Opr md_reg = new_register(T_METADATA); 2574 __ metadata2reg(md->constant_encoding(), md_reg); 2575 2576 increment_counter(new LIR_Address(md_reg, offset, 2577 NOT_LP64(T_INT) LP64_ONLY(T_LONG)), DataLayout::counter_increment); 2578 } 2579 2580 // emit phi-instruction move after safepoint since this simplifies 2581 // describing the state as the safepoint. 2582 move_to_phi(x->state()); 2583 2584 __ jump(x->default_sux()); 2585 } 2586 2587 /** 2588 * Emit profiling code if needed for arguments, parameters, return value types 2589 * 2590 * @param md MDO the code will update at runtime 2591 * @param md_base_offset common offset in the MDO for this profile and subsequent ones 2592 * @param md_offset offset in the MDO (on top of md_base_offset) for this profile 2593 * @param profiled_k current profile 2594 * @param obj IR node for the object to be profiled 2595 * @param mdp register to hold the pointer inside the MDO (md + md_base_offset). 2596 * Set once we find an update to make and use for next ones. 2597 * @param not_null true if we know obj cannot be null 2598 * @param signature_at_call_k signature at call for obj 2599 * @param callee_signature_k signature of callee for obj 2600 * at call and callee signatures differ at method handle call 2601 * @return the only klass we know will ever be seen at this profile point 2602 */ 2603 ciKlass* LIRGenerator::profile_type(ciMethodData* md, int md_base_offset, int md_offset, intptr_t profiled_k, 2604 Value obj, LIR_Opr& mdp, bool not_null, ciKlass* signature_at_call_k, 2605 ciKlass* callee_signature_k) { 2606 ciKlass* result = NULL; 2607 bool do_null = !not_null && !TypeEntries::was_null_seen(profiled_k); 2608 bool do_update = !TypeEntries::is_type_unknown(profiled_k); 2609 // known not to be null or null bit already set and already set to 2610 // unknown: nothing we can do to improve profiling 2611 if (!do_null && !do_update) { 2612 return result; 2613 } 2614 2615 ciKlass* exact_klass = NULL; 2616 Compilation* comp = Compilation::current(); 2617 if (do_update) { 2618 // try to find exact type, using CHA if possible, so that loading 2619 // the klass from the object can be avoided 2620 ciType* type = obj->exact_type(); 2621 if (type == NULL) { 2622 type = obj->declared_type(); 2623 type = comp->cha_exact_type(type); 2624 } 2625 assert(type == NULL || type->is_klass(), "type should be class"); 2626 exact_klass = (type != NULL && type->is_loaded()) ? (ciKlass*)type : NULL; 2627 2628 do_update = exact_klass == NULL || ciTypeEntries::valid_ciklass(profiled_k) != exact_klass; 2629 } 2630 2631 if (!do_null && !do_update) { 2632 return result; 2633 } 2634 2635 ciKlass* exact_signature_k = NULL; 2636 if (do_update) { 2637 // Is the type from the signature exact (the only one possible)? 2638 exact_signature_k = signature_at_call_k->exact_klass(); 2639 if (exact_signature_k == NULL) { 2640 exact_signature_k = comp->cha_exact_type(signature_at_call_k); 2641 } else { 2642 result = exact_signature_k; 2643 // Known statically. No need to emit any code: prevent 2644 // LIR_Assembler::emit_profile_type() from emitting useless code 2645 profiled_k = ciTypeEntries::with_status(result, profiled_k); 2646 } 2647 // exact_klass and exact_signature_k can be both non NULL but 2648 // different if exact_klass is loaded after the ciObject for 2649 // exact_signature_k is created. 2650 if (exact_klass == NULL && exact_signature_k != NULL && exact_klass != exact_signature_k) { 2651 // sometimes the type of the signature is better than the best type 2652 // the compiler has 2653 exact_klass = exact_signature_k; 2654 } 2655 if (callee_signature_k != NULL && 2656 callee_signature_k != signature_at_call_k) { 2657 ciKlass* improved_klass = callee_signature_k->exact_klass(); 2658 if (improved_klass == NULL) { 2659 improved_klass = comp->cha_exact_type(callee_signature_k); 2660 } 2661 if (exact_klass == NULL && improved_klass != NULL && exact_klass != improved_klass) { 2662 exact_klass = exact_signature_k; 2663 } 2664 } 2665 do_update = exact_klass == NULL || ciTypeEntries::valid_ciklass(profiled_k) != exact_klass; 2666 } 2667 2668 if (!do_null && !do_update) { 2669 return result; 2670 } 2671 2672 if (mdp == LIR_OprFact::illegalOpr) { 2673 mdp = new_register(T_METADATA); 2674 __ metadata2reg(md->constant_encoding(), mdp); 2675 if (md_base_offset != 0) { 2676 LIR_Address* base_type_address = new LIR_Address(mdp, md_base_offset, T_ADDRESS); 2677 mdp = new_pointer_register(); 2678 __ leal(LIR_OprFact::address(base_type_address), mdp); 2679 } 2680 } 2681 LIRItem value(obj, this); 2682 value.load_item(); 2683 __ profile_type(new LIR_Address(mdp, md_offset, T_METADATA), 2684 value.result(), exact_klass, profiled_k, new_pointer_register(), not_null, exact_signature_k != NULL); 2685 return result; 2686 } 2687 2688 // profile parameters on entry to the root of the compilation 2689 void LIRGenerator::profile_parameters(Base* x) { 2690 if (compilation()->profile_parameters()) { 2691 CallingConvention* args = compilation()->frame_map()->incoming_arguments(); 2692 ciMethodData* md = scope()->method()->method_data_or_null(); 2693 assert(md != NULL, "Sanity"); 2694 2695 if (md->parameters_type_data() != NULL) { 2696 ciParametersTypeData* parameters_type_data = md->parameters_type_data(); 2697 ciTypeStackSlotEntries* parameters = parameters_type_data->parameters(); 2698 LIR_Opr mdp = LIR_OprFact::illegalOpr; 2699 for (int java_index = 0, i = 0, j = 0; j < parameters_type_data->number_of_parameters(); i++) { 2700 LIR_Opr src = args->at(i); 2701 assert(!src->is_illegal(), "check"); 2702 BasicType t = src->type(); 2703 if (t == T_OBJECT || t == T_ARRAY) { 2704 intptr_t profiled_k = parameters->type(j); 2705 Local* local = x->state()->local_at(java_index)->as_Local(); 2706 ciKlass* exact = profile_type(md, md->byte_offset_of_slot(parameters_type_data, ParametersTypeData::type_offset(0)), 2707 in_bytes(ParametersTypeData::type_offset(j)) - in_bytes(ParametersTypeData::type_offset(0)), 2708 profiled_k, local, mdp, false, local->declared_type()->as_klass(), NULL); 2709 // If the profile is known statically set it once for all and do not emit any code 2710 if (exact != NULL) { 2711 md->set_parameter_type(j, exact); 2712 } 2713 j++; 2714 } 2715 java_index += type2size[t]; 2716 } 2717 } 2718 } 2719 } 2720 2721 void LIRGenerator::do_Base(Base* x) { 2722 __ std_entry(LIR_OprFact::illegalOpr); 2723 // Emit moves from physical registers / stack slots to virtual registers 2724 CallingConvention* args = compilation()->frame_map()->incoming_arguments(); 2725 IRScope* irScope = compilation()->hir()->top_scope(); 2726 int java_index = 0; 2727 for (int i = 0; i < args->length(); i++) { 2728 LIR_Opr src = args->at(i); 2729 assert(!src->is_illegal(), "check"); 2730 BasicType t = src->type(); 2731 2732 // Types which are smaller than int are passed as int, so 2733 // correct the type which passed. 2734 switch (t) { 2735 case T_BYTE: 2736 case T_BOOLEAN: 2737 case T_SHORT: 2738 case T_CHAR: 2739 t = T_INT; 2740 break; 2741 } 2742 2743 LIR_Opr dest = new_register(t); 2744 __ move(src, dest); 2745 2746 // Assign new location to Local instruction for this local 2747 Local* local = x->state()->local_at(java_index)->as_Local(); 2748 assert(local != NULL, "Locals for incoming arguments must have been created"); 2749 #ifndef __SOFTFP__ 2750 // The java calling convention passes double as long and float as int. 2751 assert(as_ValueType(t)->tag() == local->type()->tag(), "check"); 2752 #endif // __SOFTFP__ 2753 local->set_operand(dest); 2754 _instruction_for_operand.at_put_grow(dest->vreg_number(), local, NULL); 2755 java_index += type2size[t]; 2756 } 2757 2758 if (compilation()->env()->dtrace_method_probes()) { 2759 BasicTypeList signature; 2760 signature.append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread 2761 signature.append(T_METADATA); // Method* 2762 LIR_OprList* args = new LIR_OprList(); 2763 args->append(getThreadPointer()); 2764 LIR_Opr meth = new_register(T_METADATA); 2765 __ metadata2reg(method()->constant_encoding(), meth); 2766 args->append(meth); 2767 call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), voidType, NULL); 2768 } 2769 2770 if (method()->is_synchronized()) { 2771 LIR_Opr obj; 2772 if (method()->is_static()) { 2773 obj = new_register(T_OBJECT); 2774 __ oop2reg(method()->holder()->java_mirror()->constant_encoding(), obj); 2775 } else { 2776 Local* receiver = x->state()->local_at(0)->as_Local(); 2777 assert(receiver != NULL, "must already exist"); 2778 obj = receiver->operand(); 2779 } 2780 assert(obj->is_valid(), "must be valid"); 2781 2782 if (method()->is_synchronized() && GenerateSynchronizationCode) { 2783 LIR_Opr lock = new_register(T_INT); 2784 __ load_stack_address_monitor(0, lock); 2785 2786 CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, SynchronizationEntryBCI), NULL, x->check_flag(Instruction::DeoptimizeOnException)); 2787 CodeStub* slow_path = new MonitorEnterStub(obj, lock, info); 2788 2789 // receiver is guaranteed non-NULL so don't need CodeEmitInfo 2790 __ lock_object(syncTempOpr(), obj, lock, new_register(T_OBJECT), slow_path, NULL); 2791 } 2792 } 2793 if (compilation()->age_code()) { 2794 CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, 0), NULL, false); 2795 decrement_age(info); 2796 } 2797 // increment invocation counters if needed 2798 if (!method()->is_accessor()) { // Accessors do not have MDOs, so no counting. 2799 profile_parameters(x); 2800 CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, SynchronizationEntryBCI), NULL, false); 2801 increment_invocation_counter(info); 2802 } 2803 2804 // all blocks with a successor must end with an unconditional jump 2805 // to the successor even if they are consecutive 2806 __ jump(x->default_sux()); 2807 } 2808 2809 2810 void LIRGenerator::do_OsrEntry(OsrEntry* x) { 2811 // construct our frame and model the production of incoming pointer 2812 // to the OSR buffer. 2813 __ osr_entry(LIR_Assembler::osrBufferPointer()); 2814 LIR_Opr result = rlock_result(x); 2815 __ move(LIR_Assembler::osrBufferPointer(), result); 2816 } 2817 2818 2819 void LIRGenerator::invoke_load_arguments(Invoke* x, LIRItemList* args, const LIR_OprList* arg_list) { 2820 assert(args->length() == arg_list->length(), 2821 err_msg_res("args=%d, arg_list=%d", args->length(), arg_list->length())); 2822 for (int i = x->has_receiver() ? 1 : 0; i < args->length(); i++) { 2823 LIRItem* param = args->at(i); 2824 LIR_Opr loc = arg_list->at(i); 2825 if (loc->is_register()) { 2826 param->load_item_force(loc); 2827 } else { 2828 LIR_Address* addr = loc->as_address_ptr(); 2829 param->load_for_store(addr->type()); 2830 if (addr->type() == T_OBJECT) { 2831 __ move_wide(param->result(), addr); 2832 } else 2833 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 2834 __ unaligned_move(param->result(), addr); 2835 } else { 2836 __ move(param->result(), addr); 2837 } 2838 } 2839 } 2840 2841 if (x->has_receiver()) { 2842 LIRItem* receiver = args->at(0); 2843 LIR_Opr loc = arg_list->at(0); 2844 if (loc->is_register()) { 2845 receiver->load_item_force(loc); 2846 } else { 2847 assert(loc->is_address(), "just checking"); 2848 receiver->load_for_store(T_OBJECT); 2849 __ move_wide(receiver->result(), loc->as_address_ptr()); 2850 } 2851 } 2852 } 2853 2854 2855 // Visits all arguments, returns appropriate items without loading them 2856 LIRItemList* LIRGenerator::invoke_visit_arguments(Invoke* x) { 2857 LIRItemList* argument_items = new LIRItemList(); 2858 if (x->has_receiver()) { 2859 LIRItem* receiver = new LIRItem(x->receiver(), this); 2860 argument_items->append(receiver); 2861 } 2862 for (int i = 0; i < x->number_of_arguments(); i++) { 2863 LIRItem* param = new LIRItem(x->argument_at(i), this); 2864 argument_items->append(param); 2865 } 2866 return argument_items; 2867 } 2868 2869 2870 // The invoke with receiver has following phases: 2871 // a) traverse and load/lock receiver; 2872 // b) traverse all arguments -> item-array (invoke_visit_argument) 2873 // c) push receiver on stack 2874 // d) load each of the items and push on stack 2875 // e) unlock receiver 2876 // f) move receiver into receiver-register %o0 2877 // g) lock result registers and emit call operation 2878 // 2879 // Before issuing a call, we must spill-save all values on stack 2880 // that are in caller-save register. "spill-save" moves those registers 2881 // either in a free callee-save register or spills them if no free 2882 // callee save register is available. 2883 // 2884 // The problem is where to invoke spill-save. 2885 // - if invoked between e) and f), we may lock callee save 2886 // register in "spill-save" that destroys the receiver register 2887 // before f) is executed 2888 // - if we rearrange f) to be earlier (by loading %o0) it 2889 // may destroy a value on the stack that is currently in %o0 2890 // and is waiting to be spilled 2891 // - if we keep the receiver locked while doing spill-save, 2892 // we cannot spill it as it is spill-locked 2893 // 2894 void LIRGenerator::do_Invoke(Invoke* x) { 2895 CallingConvention* cc = frame_map()->java_calling_convention(x->signature(), true); 2896 2897 LIR_OprList* arg_list = cc->args(); 2898 LIRItemList* args = invoke_visit_arguments(x); 2899 LIR_Opr receiver = LIR_OprFact::illegalOpr; 2900 2901 // setup result register 2902 LIR_Opr result_register = LIR_OprFact::illegalOpr; 2903 if (x->type() != voidType) { 2904 result_register = result_register_for(x->type()); 2905 } 2906 2907 CodeEmitInfo* info = state_for(x, x->state()); 2908 2909 invoke_load_arguments(x, args, arg_list); 2910 2911 if (x->has_receiver()) { 2912 args->at(0)->load_item_force(LIR_Assembler::receiverOpr()); 2913 receiver = args->at(0)->result(); 2914 } 2915 2916 // emit invoke code 2917 bool optimized = x->target_is_loaded() && x->target_is_final(); 2918 assert(receiver->is_illegal() || receiver->is_equal(LIR_Assembler::receiverOpr()), "must match"); 2919 2920 // JSR 292 2921 // Preserve the SP over MethodHandle call sites, if needed. 2922 ciMethod* target = x->target(); 2923 bool is_method_handle_invoke = (// %%% FIXME: Are both of these relevant? 2924 target->is_method_handle_intrinsic() || 2925 target->is_compiled_lambda_form()); 2926 if (is_method_handle_invoke) { 2927 info->set_is_method_handle_invoke(true); 2928 if(FrameMap::method_handle_invoke_SP_save_opr() != LIR_OprFact::illegalOpr) { 2929 __ move(FrameMap::stack_pointer(), FrameMap::method_handle_invoke_SP_save_opr()); 2930 } 2931 } 2932 2933 switch (x->code()) { 2934 case Bytecodes::_invokestatic: 2935 __ call_static(target, result_register, 2936 SharedRuntime::get_resolve_static_call_stub(), 2937 arg_list, info); 2938 break; 2939 case Bytecodes::_invokespecial: 2940 case Bytecodes::_invokevirtual: 2941 case Bytecodes::_invokeinterface: 2942 // for final target we still produce an inline cache, in order 2943 // to be able to call mixed mode 2944 if (x->code() == Bytecodes::_invokespecial || optimized) { 2945 __ call_opt_virtual(target, receiver, result_register, 2946 SharedRuntime::get_resolve_opt_virtual_call_stub(), 2947 arg_list, info); 2948 } else if (x->vtable_index() < 0) { 2949 __ call_icvirtual(target, receiver, result_register, 2950 SharedRuntime::get_resolve_virtual_call_stub(), 2951 arg_list, info); 2952 } else { 2953 int entry_offset = InstanceKlass::vtable_start_offset() + x->vtable_index() * vtableEntry::size(); 2954 int vtable_offset = entry_offset * wordSize + vtableEntry::method_offset_in_bytes(); 2955 __ call_virtual(target, receiver, result_register, vtable_offset, arg_list, info); 2956 } 2957 break; 2958 case Bytecodes::_invokedynamic: { 2959 __ call_dynamic(target, receiver, result_register, 2960 SharedRuntime::get_resolve_static_call_stub(), 2961 arg_list, info); 2962 break; 2963 } 2964 default: 2965 fatal(err_msg("unexpected bytecode: %s", Bytecodes::name(x->code()))); 2966 break; 2967 } 2968 2969 // JSR 292 2970 // Restore the SP after MethodHandle call sites, if needed. 2971 if (is_method_handle_invoke 2972 && FrameMap::method_handle_invoke_SP_save_opr() != LIR_OprFact::illegalOpr) { 2973 __ move(FrameMap::method_handle_invoke_SP_save_opr(), FrameMap::stack_pointer()); 2974 } 2975 2976 if (x->type()->is_float() || x->type()->is_double()) { 2977 // Force rounding of results from non-strictfp when in strictfp 2978 // scope (or when we don't know the strictness of the callee, to 2979 // be safe.) 2980 if (method()->is_strict()) { 2981 if (!x->target_is_loaded() || !x->target_is_strictfp()) { 2982 result_register = round_item(result_register); 2983 } 2984 } 2985 } 2986 2987 if (result_register->is_valid()) { 2988 LIR_Opr result = rlock_result(x); 2989 __ move(result_register, result); 2990 } 2991 } 2992 2993 2994 void LIRGenerator::do_FPIntrinsics(Intrinsic* x) { 2995 assert(x->number_of_arguments() == 1, "wrong type"); 2996 LIRItem value (x->argument_at(0), this); 2997 LIR_Opr reg = rlock_result(x); 2998 value.load_item(); 2999 LIR_Opr tmp = force_to_spill(value.result(), as_BasicType(x->type())); 3000 __ move(tmp, reg); 3001 } 3002 3003 3004 3005 // Code for : x->x() {x->cond()} x->y() ? x->tval() : x->fval() 3006 void LIRGenerator::do_IfOp(IfOp* x) { 3007 #ifdef ASSERT 3008 { 3009 ValueTag xtag = x->x()->type()->tag(); 3010 ValueTag ttag = x->tval()->type()->tag(); 3011 assert(xtag == intTag || xtag == objectTag, "cannot handle others"); 3012 assert(ttag == addressTag || ttag == intTag || ttag == objectTag || ttag == longTag, "cannot handle others"); 3013 assert(ttag == x->fval()->type()->tag(), "cannot handle others"); 3014 } 3015 #endif 3016 3017 LIRItem left(x->x(), this); 3018 LIRItem right(x->y(), this); 3019 left.load_item(); 3020 if (can_inline_as_constant(right.value())) { 3021 right.dont_load_item(); 3022 } else { 3023 right.load_item(); 3024 } 3025 3026 LIRItem t_val(x->tval(), this); 3027 LIRItem f_val(x->fval(), this); 3028 t_val.dont_load_item(); 3029 f_val.dont_load_item(); 3030 LIR_Opr reg = rlock_result(x); 3031 3032 __ cmp(lir_cond(x->cond()), left.result(), right.result()); 3033 __ cmove(lir_cond(x->cond()), t_val.result(), f_val.result(), reg, as_BasicType(x->x()->type())); 3034 } 3035 3036 void LIRGenerator::do_RuntimeCall(address routine, int expected_arguments, Intrinsic* x) { 3037 assert(x->number_of_arguments() == expected_arguments, "wrong type"); 3038 LIR_Opr reg = result_register_for(x->type()); 3039 __ call_runtime_leaf(routine, getThreadTemp(), 3040 reg, new LIR_OprList()); 3041 LIR_Opr result = rlock_result(x); 3042 __ move(reg, result); 3043 } 3044 3045 #ifdef TRACE_HAVE_INTRINSICS 3046 void LIRGenerator::do_ThreadIDIntrinsic(Intrinsic* x) { 3047 LIR_Opr thread = getThreadPointer(); 3048 LIR_Opr osthread = new_pointer_register(); 3049 __ move(new LIR_Address(thread, in_bytes(JavaThread::osthread_offset()), osthread->type()), osthread); 3050 size_t thread_id_size = OSThread::thread_id_size(); 3051 if (thread_id_size == (size_t) BytesPerLong) { 3052 LIR_Opr id = new_register(T_LONG); 3053 __ move(new LIR_Address(osthread, in_bytes(OSThread::thread_id_offset()), T_LONG), id); 3054 __ convert(Bytecodes::_l2i, id, rlock_result(x)); 3055 } else if (thread_id_size == (size_t) BytesPerInt) { 3056 __ move(new LIR_Address(osthread, in_bytes(OSThread::thread_id_offset()), T_INT), rlock_result(x)); 3057 } else { 3058 ShouldNotReachHere(); 3059 } 3060 } 3061 3062 void LIRGenerator::do_ClassIDIntrinsic(Intrinsic* x) { 3063 CodeEmitInfo* info = state_for(x); 3064 CodeEmitInfo* info2 = new CodeEmitInfo(info); // Clone for the second null check 3065 BasicType klass_pointer_type = NOT_LP64(T_INT) LP64_ONLY(T_LONG); 3066 assert(info != NULL, "must have info"); 3067 LIRItem arg(x->argument_at(1), this); 3068 arg.load_item(); 3069 LIR_Opr klass = new_pointer_register(); 3070 __ move(new LIR_Address(arg.result(), java_lang_Class::klass_offset_in_bytes(), klass_pointer_type), klass, info); 3071 LIR_Opr id = new_register(T_LONG); 3072 ByteSize offset = TRACE_ID_OFFSET; 3073 LIR_Address* trace_id_addr = new LIR_Address(klass, in_bytes(offset), T_LONG); 3074 __ move(trace_id_addr, id); 3075 __ logical_or(id, LIR_OprFact::longConst(0x01l), id); 3076 __ store(id, trace_id_addr); 3077 __ logical_and(id, LIR_OprFact::longConst(~0x3l), id); 3078 __ move(id, rlock_result(x)); 3079 } 3080 #endif 3081 3082 void LIRGenerator::do_Intrinsic(Intrinsic* x) { 3083 switch (x->id()) { 3084 case vmIntrinsics::_intBitsToFloat : 3085 case vmIntrinsics::_doubleToRawLongBits : 3086 case vmIntrinsics::_longBitsToDouble : 3087 case vmIntrinsics::_floatToRawIntBits : { 3088 do_FPIntrinsics(x); 3089 break; 3090 } 3091 3092 #ifdef TRACE_HAVE_INTRINSICS 3093 case vmIntrinsics::_threadID: do_ThreadIDIntrinsic(x); break; 3094 case vmIntrinsics::_classID: do_ClassIDIntrinsic(x); break; 3095 case vmIntrinsics::_counterTime: 3096 do_RuntimeCall(CAST_FROM_FN_PTR(address, TRACE_TIME_METHOD), 0, x); 3097 break; 3098 #endif 3099 3100 case vmIntrinsics::_currentTimeMillis: 3101 do_RuntimeCall(CAST_FROM_FN_PTR(address, os::javaTimeMillis), 0, x); 3102 break; 3103 3104 case vmIntrinsics::_nanoTime: 3105 do_RuntimeCall(CAST_FROM_FN_PTR(address, os::javaTimeNanos), 0, x); 3106 break; 3107 3108 case vmIntrinsics::_Object_init: do_RegisterFinalizer(x); break; 3109 case vmIntrinsics::_isInstance: do_isInstance(x); break; 3110 case vmIntrinsics::_getClass: do_getClass(x); break; 3111 case vmIntrinsics::_currentThread: do_currentThread(x); break; 3112 3113 case vmIntrinsics::_dlog: // fall through 3114 case vmIntrinsics::_dlog10: // fall through 3115 case vmIntrinsics::_dabs: // fall through 3116 case vmIntrinsics::_dsqrt: // fall through 3117 case vmIntrinsics::_dtan: // fall through 3118 case vmIntrinsics::_dsin : // fall through 3119 case vmIntrinsics::_dcos : // fall through 3120 case vmIntrinsics::_dexp : // fall through 3121 case vmIntrinsics::_dpow : do_MathIntrinsic(x); break; 3122 case vmIntrinsics::_arraycopy: do_ArrayCopy(x); break; 3123 3124 // java.nio.Buffer.checkIndex 3125 case vmIntrinsics::_checkIndex: do_NIOCheckIndex(x); break; 3126 3127 case vmIntrinsics::_compareAndSwapObject: 3128 do_CompareAndSwap(x, objectType); 3129 break; 3130 case vmIntrinsics::_compareAndSwapInt: 3131 do_CompareAndSwap(x, intType); 3132 break; 3133 case vmIntrinsics::_compareAndSwapLong: 3134 do_CompareAndSwap(x, longType); 3135 break; 3136 3137 case vmIntrinsics::_loadFence : 3138 if (os::is_MP()) __ membar_acquire(); 3139 break; 3140 case vmIntrinsics::_storeFence: 3141 if (os::is_MP()) __ membar_release(); 3142 break; 3143 case vmIntrinsics::_fullFence : 3144 if (os::is_MP()) __ membar(); 3145 break; 3146 3147 case vmIntrinsics::_Reference_get: 3148 do_Reference_get(x); 3149 break; 3150 3151 case vmIntrinsics::_updateCRC32: 3152 case vmIntrinsics::_updateBytesCRC32: 3153 case vmIntrinsics::_updateByteBufferCRC32: 3154 do_update_CRC32(x); 3155 break; 3156 3157 default: ShouldNotReachHere(); break; 3158 } 3159 } 3160 3161 void LIRGenerator::profile_arguments(ProfileCall* x) { 3162 if (compilation()->profile_arguments()) { 3163 int bci = x->bci_of_invoke(); 3164 ciMethodData* md = x->method()->method_data_or_null(); 3165 ciProfileData* data = md->bci_to_data(bci); 3166 if ((data->is_CallTypeData() && data->as_CallTypeData()->has_arguments()) || 3167 (data->is_VirtualCallTypeData() && data->as_VirtualCallTypeData()->has_arguments())) { 3168 ByteSize extra = data->is_CallTypeData() ? CallTypeData::args_data_offset() : VirtualCallTypeData::args_data_offset(); 3169 int base_offset = md->byte_offset_of_slot(data, extra); 3170 LIR_Opr mdp = LIR_OprFact::illegalOpr; 3171 ciTypeStackSlotEntries* args = data->is_CallTypeData() ? ((ciCallTypeData*)data)->args() : ((ciVirtualCallTypeData*)data)->args(); 3172 3173 Bytecodes::Code bc = x->method()->java_code_at_bci(bci); 3174 int start = 0; 3175 int stop = data->is_CallTypeData() ? ((ciCallTypeData*)data)->number_of_arguments() : ((ciVirtualCallTypeData*)data)->number_of_arguments(); 3176 if (x->inlined() && x->callee()->is_static() && Bytecodes::has_receiver(bc)) { 3177 // first argument is not profiled at call (method handle invoke) 3178 assert(x->method()->raw_code_at_bci(bci) == Bytecodes::_invokehandle, "invokehandle expected"); 3179 start = 1; 3180 } 3181 ciSignature* callee_signature = x->callee()->signature(); 3182 // method handle call to virtual method 3183 bool has_receiver = x->inlined() && !x->callee()->is_static() && !Bytecodes::has_receiver(bc); 3184 ciSignatureStream callee_signature_stream(callee_signature, has_receiver ? x->callee()->holder() : NULL); 3185 3186 bool ignored_will_link; 3187 ciSignature* signature_at_call = NULL; 3188 x->method()->get_method_at_bci(bci, ignored_will_link, &signature_at_call); 3189 ciSignatureStream signature_at_call_stream(signature_at_call); 3190 3191 // if called through method handle invoke, some arguments may have been popped 3192 for (int i = 0; i < stop && i+start < x->nb_profiled_args(); i++) { 3193 int off = in_bytes(TypeEntriesAtCall::argument_type_offset(i)) - in_bytes(TypeEntriesAtCall::args_data_offset()); 3194 ciKlass* exact = profile_type(md, base_offset, off, 3195 args->type(i), x->profiled_arg_at(i+start), mdp, 3196 !x->arg_needs_null_check(i+start), 3197 signature_at_call_stream.next_klass(), callee_signature_stream.next_klass()); 3198 if (exact != NULL) { 3199 md->set_argument_type(bci, i, exact); 3200 } 3201 } 3202 } else { 3203 #ifdef ASSERT 3204 Bytecodes::Code code = x->method()->raw_code_at_bci(x->bci_of_invoke()); 3205 int n = x->nb_profiled_args(); 3206 assert(MethodData::profile_parameters() && (MethodData::profile_arguments_jsr292_only() || 3207 (x->inlined() && ((code == Bytecodes::_invokedynamic && n <= 1) || (code == Bytecodes::_invokehandle && n <= 2)))), 3208 "only at JSR292 bytecodes"); 3209 #endif 3210 } 3211 } 3212 } 3213 3214 // profile parameters on entry to an inlined method 3215 void LIRGenerator::profile_parameters_at_call(ProfileCall* x) { 3216 if (compilation()->profile_parameters() && x->inlined()) { 3217 ciMethodData* md = x->callee()->method_data_or_null(); 3218 if (md != NULL) { 3219 ciParametersTypeData* parameters_type_data = md->parameters_type_data(); 3220 if (parameters_type_data != NULL) { 3221 ciTypeStackSlotEntries* parameters = parameters_type_data->parameters(); 3222 LIR_Opr mdp = LIR_OprFact::illegalOpr; 3223 bool has_receiver = !x->callee()->is_static(); 3224 ciSignature* sig = x->callee()->signature(); 3225 ciSignatureStream sig_stream(sig, has_receiver ? x->callee()->holder() : NULL); 3226 int i = 0; // to iterate on the Instructions 3227 Value arg = x->recv(); 3228 bool not_null = false; 3229 int bci = x->bci_of_invoke(); 3230 Bytecodes::Code bc = x->method()->java_code_at_bci(bci); 3231 // The first parameter is the receiver so that's what we start 3232 // with if it exists. One exception is method handle call to 3233 // virtual method: the receiver is in the args list 3234 if (arg == NULL || !Bytecodes::has_receiver(bc)) { 3235 i = 1; 3236 arg = x->profiled_arg_at(0); 3237 not_null = !x->arg_needs_null_check(0); 3238 } 3239 int k = 0; // to iterate on the profile data 3240 for (;;) { 3241 intptr_t profiled_k = parameters->type(k); 3242 ciKlass* exact = profile_type(md, md->byte_offset_of_slot(parameters_type_data, ParametersTypeData::type_offset(0)), 3243 in_bytes(ParametersTypeData::type_offset(k)) - in_bytes(ParametersTypeData::type_offset(0)), 3244 profiled_k, arg, mdp, not_null, sig_stream.next_klass(), NULL); 3245 // If the profile is known statically set it once for all and do not emit any code 3246 if (exact != NULL) { 3247 md->set_parameter_type(k, exact); 3248 } 3249 k++; 3250 if (k >= parameters_type_data->number_of_parameters()) { 3251 #ifdef ASSERT 3252 int extra = 0; 3253 if (MethodData::profile_arguments() && TypeProfileParmsLimit != -1 && 3254 x->nb_profiled_args() >= TypeProfileParmsLimit && 3255 x->recv() != NULL && Bytecodes::has_receiver(bc)) { 3256 extra += 1; 3257 } 3258 assert(i == x->nb_profiled_args() - extra || (TypeProfileParmsLimit != -1 && TypeProfileArgsLimit > TypeProfileParmsLimit), "unused parameters?"); 3259 #endif 3260 break; 3261 } 3262 arg = x->profiled_arg_at(i); 3263 not_null = !x->arg_needs_null_check(i); 3264 i++; 3265 } 3266 } 3267 } 3268 } 3269 } 3270 3271 void LIRGenerator::do_ProfileCall(ProfileCall* x) { 3272 // Need recv in a temporary register so it interferes with the other temporaries 3273 LIR_Opr recv = LIR_OprFact::illegalOpr; 3274 LIR_Opr mdo = new_register(T_OBJECT); 3275 // tmp is used to hold the counters on SPARC 3276 LIR_Opr tmp = new_pointer_register(); 3277 3278 if (x->nb_profiled_args() > 0) { 3279 profile_arguments(x); 3280 } 3281 3282 // profile parameters on inlined method entry including receiver 3283 if (x->recv() != NULL || x->nb_profiled_args() > 0) { 3284 profile_parameters_at_call(x); 3285 } 3286 3287 if (x->recv() != NULL) { 3288 LIRItem value(x->recv(), this); 3289 value.load_item(); 3290 recv = new_register(T_OBJECT); 3291 __ move(value.result(), recv); 3292 } 3293 __ profile_call(x->method(), x->bci_of_invoke(), x->callee(), mdo, recv, tmp, x->known_holder()); 3294 } 3295 3296 void LIRGenerator::do_ProfileReturnType(ProfileReturnType* x) { 3297 int bci = x->bci_of_invoke(); 3298 ciMethodData* md = x->method()->method_data_or_null(); 3299 ciProfileData* data = md->bci_to_data(bci); 3300 assert(data->is_CallTypeData() || data->is_VirtualCallTypeData(), "wrong profile data type"); 3301 ciReturnTypeEntry* ret = data->is_CallTypeData() ? ((ciCallTypeData*)data)->ret() : ((ciVirtualCallTypeData*)data)->ret(); 3302 LIR_Opr mdp = LIR_OprFact::illegalOpr; 3303 3304 bool ignored_will_link; 3305 ciSignature* signature_at_call = NULL; 3306 x->method()->get_method_at_bci(bci, ignored_will_link, &signature_at_call); 3307 3308 // The offset within the MDO of the entry to update may be too large 3309 // to be used in load/store instructions on some platforms. So have 3310 // profile_type() compute the address of the profile in a register. 3311 ciKlass* exact = profile_type(md, md->byte_offset_of_slot(data, ret->type_offset()), 0, 3312 ret->type(), x->ret(), mdp, 3313 !x->needs_null_check(), 3314 signature_at_call->return_type()->as_klass(), 3315 x->callee()->signature()->return_type()->as_klass()); 3316 if (exact != NULL) { 3317 md->set_return_type(bci, exact); 3318 } 3319 } 3320 3321 void LIRGenerator::do_ProfileInvoke(ProfileInvoke* x) { 3322 // We can safely ignore accessors here, since c2 will inline them anyway, 3323 // accessors are also always mature. 3324 if (!x->inlinee()->is_accessor()) { 3325 CodeEmitInfo* info = state_for(x, x->state(), true); 3326 // Notify the runtime very infrequently only to take care of counter overflows 3327 int freq_log = Tier23InlineeNotifyFreqLog; 3328 double scale; 3329 if (_method->has_option_value("CompileThresholdScaling", scale)) { 3330 freq_log = Arguments::scaled_freq_log(freq_log, scale); 3331 } 3332 increment_event_counter_impl(info, x->inlinee(), right_n_bits(freq_log), InvocationEntryBci, false, true); 3333 } 3334 } 3335 3336 void LIRGenerator::increment_event_counter(CodeEmitInfo* info, int bci, bool backedge) { 3337 int freq_log; 3338 int level = compilation()->env()->comp_level(); 3339 if (level == CompLevel_limited_profile) { 3340 freq_log = (backedge ? Tier2BackedgeNotifyFreqLog : Tier2InvokeNotifyFreqLog); 3341 } else if (level == CompLevel_full_profile) { 3342 freq_log = (backedge ? Tier3BackedgeNotifyFreqLog : Tier3InvokeNotifyFreqLog); 3343 } else { 3344 ShouldNotReachHere(); 3345 } 3346 // Increment the appropriate invocation/backedge counter and notify the runtime. 3347 double scale; 3348 if (_method->has_option_value("CompileThresholdScaling", scale)) { 3349 freq_log = Arguments::scaled_freq_log(freq_log, scale); 3350 } 3351 increment_event_counter_impl(info, info->scope()->method(), right_n_bits(freq_log), bci, backedge, true); 3352 } 3353 3354 void LIRGenerator::decrement_age(CodeEmitInfo* info) { 3355 ciMethod* method = info->scope()->method(); 3356 MethodCounters* mc_adr = method->ensure_method_counters(); 3357 if (mc_adr != NULL) { 3358 LIR_Opr mc = new_pointer_register(); 3359 __ move(LIR_OprFact::intptrConst(mc_adr), mc); 3360 int offset = in_bytes(MethodCounters::nmethod_age_offset()); 3361 LIR_Address* counter = new LIR_Address(mc, offset, T_INT); 3362 LIR_Opr result = new_register(T_INT); 3363 __ load(counter, result); 3364 __ sub(result, LIR_OprFact::intConst(1), result); 3365 __ store(result, counter); 3366 // DeoptimizeStub will reexecute from the current state in code info. 3367 CodeStub* deopt = new DeoptimizeStub(info, Deoptimization::Reason_tenured, 3368 Deoptimization::Action_make_not_entrant); 3369 __ cmp(lir_cond_lessEqual, result, LIR_OprFact::intConst(0)); 3370 __ branch(lir_cond_lessEqual, T_INT, deopt); 3371 } 3372 } 3373 3374 3375 void LIRGenerator::increment_event_counter_impl(CodeEmitInfo* info, 3376 ciMethod *method, int frequency, 3377 int bci, bool backedge, bool notify) { 3378 assert(frequency == 0 || is_power_of_2(frequency + 1), "Frequency must be x^2 - 1 or 0"); 3379 int level = _compilation->env()->comp_level(); 3380 assert(level > CompLevel_simple, "Shouldn't be here"); 3381 3382 int offset = -1; 3383 LIR_Opr counter_holder; 3384 if (level == CompLevel_limited_profile) { 3385 MethodCounters* counters_adr = method->ensure_method_counters(); 3386 if (counters_adr == NULL) { 3387 bailout("method counters allocation failed"); 3388 return; 3389 } 3390 counter_holder = new_pointer_register(); 3391 __ move(LIR_OprFact::intptrConst(counters_adr), counter_holder); 3392 offset = in_bytes(backedge ? MethodCounters::backedge_counter_offset() : 3393 MethodCounters::invocation_counter_offset()); 3394 } else if (level == CompLevel_full_profile) { 3395 counter_holder = new_register(T_METADATA); 3396 offset = in_bytes(backedge ? MethodData::backedge_counter_offset() : 3397 MethodData::invocation_counter_offset()); 3398 ciMethodData* md = method->method_data_or_null(); 3399 assert(md != NULL, "Sanity"); 3400 __ metadata2reg(md->constant_encoding(), counter_holder); 3401 } else { 3402 ShouldNotReachHere(); 3403 } 3404 LIR_Address* counter = new LIR_Address(counter_holder, offset, T_INT); 3405 LIR_Opr result = new_register(T_INT); 3406 __ load(counter, result); 3407 __ add(result, LIR_OprFact::intConst(InvocationCounter::count_increment), result); 3408 __ store(result, counter); 3409 if (notify) { 3410 LIR_Opr mask = load_immediate(frequency << InvocationCounter::count_shift, T_INT); 3411 LIR_Opr meth = new_register(T_METADATA); 3412 __ metadata2reg(method->constant_encoding(), meth); 3413 __ logical_and(result, mask, result); 3414 __ cmp(lir_cond_equal, result, LIR_OprFact::intConst(0)); 3415 // The bci for info can point to cmp for if's we want the if bci 3416 CodeStub* overflow = new CounterOverflowStub(info, bci, meth); 3417 __ branch(lir_cond_equal, T_INT, overflow); 3418 __ branch_destination(overflow->continuation()); 3419 } 3420 } 3421 3422 void LIRGenerator::do_RuntimeCall(RuntimeCall* x) { 3423 LIR_OprList* args = new LIR_OprList(x->number_of_arguments()); 3424 BasicTypeList* signature = new BasicTypeList(x->number_of_arguments()); 3425 3426 if (x->pass_thread()) { 3427 signature->append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread 3428 args->append(getThreadPointer()); 3429 } 3430 3431 for (int i = 0; i < x->number_of_arguments(); i++) { 3432 Value a = x->argument_at(i); 3433 LIRItem* item = new LIRItem(a, this); 3434 item->load_item(); 3435 args->append(item->result()); 3436 signature->append(as_BasicType(a->type())); 3437 } 3438 3439 LIR_Opr result = call_runtime(signature, args, x->entry(), x->type(), NULL); 3440 if (x->type() == voidType) { 3441 set_no_result(x); 3442 } else { 3443 __ move(result, rlock_result(x)); 3444 } 3445 } 3446 3447 #ifdef ASSERT 3448 void LIRGenerator::do_Assert(Assert *x) { 3449 ValueTag tag = x->x()->type()->tag(); 3450 If::Condition cond = x->cond(); 3451 3452 LIRItem xitem(x->x(), this); 3453 LIRItem yitem(x->y(), this); 3454 LIRItem* xin = &xitem; 3455 LIRItem* yin = &yitem; 3456 3457 assert(tag == intTag, "Only integer assertions are valid!"); 3458 3459 xin->load_item(); 3460 yin->dont_load_item(); 3461 3462 set_no_result(x); 3463 3464 LIR_Opr left = xin->result(); 3465 LIR_Opr right = yin->result(); 3466 3467 __ lir_assert(lir_cond(x->cond()), left, right, x->message(), true); 3468 } 3469 #endif 3470 3471 void LIRGenerator::do_RangeCheckPredicate(RangeCheckPredicate *x) { 3472 3473 3474 Instruction *a = x->x(); 3475 Instruction *b = x->y(); 3476 if (!a || StressRangeCheckElimination) { 3477 assert(!b || StressRangeCheckElimination, "B must also be null"); 3478 3479 CodeEmitInfo *info = state_for(x, x->state()); 3480 CodeStub* stub = new PredicateFailedStub(info); 3481 3482 __ jump(stub); 3483 } else if (a->type()->as_IntConstant() && b->type()->as_IntConstant()) { 3484 int a_int = a->type()->as_IntConstant()->value(); 3485 int b_int = b->type()->as_IntConstant()->value(); 3486 3487 bool ok = false; 3488 3489 switch(x->cond()) { 3490 case Instruction::eql: ok = (a_int == b_int); break; 3491 case Instruction::neq: ok = (a_int != b_int); break; 3492 case Instruction::lss: ok = (a_int < b_int); break; 3493 case Instruction::leq: ok = (a_int <= b_int); break; 3494 case Instruction::gtr: ok = (a_int > b_int); break; 3495 case Instruction::geq: ok = (a_int >= b_int); break; 3496 case Instruction::aeq: ok = ((unsigned int)a_int >= (unsigned int)b_int); break; 3497 case Instruction::beq: ok = ((unsigned int)a_int <= (unsigned int)b_int); break; 3498 default: ShouldNotReachHere(); 3499 } 3500 3501 if (ok) { 3502 3503 CodeEmitInfo *info = state_for(x, x->state()); 3504 CodeStub* stub = new PredicateFailedStub(info); 3505 3506 __ jump(stub); 3507 } 3508 } else { 3509 3510 ValueTag tag = x->x()->type()->tag(); 3511 If::Condition cond = x->cond(); 3512 LIRItem xitem(x->x(), this); 3513 LIRItem yitem(x->y(), this); 3514 LIRItem* xin = &xitem; 3515 LIRItem* yin = &yitem; 3516 3517 assert(tag == intTag, "Only integer deoptimizations are valid!"); 3518 3519 xin->load_item(); 3520 yin->dont_load_item(); 3521 set_no_result(x); 3522 3523 LIR_Opr left = xin->result(); 3524 LIR_Opr right = yin->result(); 3525 3526 CodeEmitInfo *info = state_for(x, x->state()); 3527 CodeStub* stub = new PredicateFailedStub(info); 3528 3529 __ cmp(lir_cond(cond), left, right); 3530 __ branch(lir_cond(cond), right->type(), stub); 3531 } 3532 } 3533 3534 3535 LIR_Opr LIRGenerator::call_runtime(Value arg1, address entry, ValueType* result_type, CodeEmitInfo* info) { 3536 LIRItemList args(1); 3537 LIRItem value(arg1, this); 3538 args.append(&value); 3539 BasicTypeList signature; 3540 signature.append(as_BasicType(arg1->type())); 3541 3542 return call_runtime(&signature, &args, entry, result_type, info); 3543 } 3544 3545 3546 LIR_Opr LIRGenerator::call_runtime(Value arg1, Value arg2, address entry, ValueType* result_type, CodeEmitInfo* info) { 3547 LIRItemList args(2); 3548 LIRItem value1(arg1, this); 3549 LIRItem value2(arg2, this); 3550 args.append(&value1); 3551 args.append(&value2); 3552 BasicTypeList signature; 3553 signature.append(as_BasicType(arg1->type())); 3554 signature.append(as_BasicType(arg2->type())); 3555 3556 return call_runtime(&signature, &args, entry, result_type, info); 3557 } 3558 3559 3560 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIR_OprList* args, 3561 address entry, ValueType* result_type, CodeEmitInfo* info) { 3562 // get a result register 3563 LIR_Opr phys_reg = LIR_OprFact::illegalOpr; 3564 LIR_Opr result = LIR_OprFact::illegalOpr; 3565 if (result_type->tag() != voidTag) { 3566 result = new_register(result_type); 3567 phys_reg = result_register_for(result_type); 3568 } 3569 3570 // move the arguments into the correct location 3571 CallingConvention* cc = frame_map()->c_calling_convention(signature); 3572 assert(cc->length() == args->length(), "argument mismatch"); 3573 for (int i = 0; i < args->length(); i++) { 3574 LIR_Opr arg = args->at(i); 3575 LIR_Opr loc = cc->at(i); 3576 if (loc->is_register()) { 3577 __ move(arg, loc); 3578 } else { 3579 LIR_Address* addr = loc->as_address_ptr(); 3580 // if (!can_store_as_constant(arg)) { 3581 // LIR_Opr tmp = new_register(arg->type()); 3582 // __ move(arg, tmp); 3583 // arg = tmp; 3584 // } 3585 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 3586 __ unaligned_move(arg, addr); 3587 } else { 3588 __ move(arg, addr); 3589 } 3590 } 3591 } 3592 3593 if (info) { 3594 __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info); 3595 } else { 3596 __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args()); 3597 } 3598 if (result->is_valid()) { 3599 __ move(phys_reg, result); 3600 } 3601 return result; 3602 } 3603 3604 3605 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIRItemList* args, 3606 address entry, ValueType* result_type, CodeEmitInfo* info) { 3607 // get a result register 3608 LIR_Opr phys_reg = LIR_OprFact::illegalOpr; 3609 LIR_Opr result = LIR_OprFact::illegalOpr; 3610 if (result_type->tag() != voidTag) { 3611 result = new_register(result_type); 3612 phys_reg = result_register_for(result_type); 3613 } 3614 3615 // move the arguments into the correct location 3616 CallingConvention* cc = frame_map()->c_calling_convention(signature); 3617 3618 assert(cc->length() == args->length(), "argument mismatch"); 3619 for (int i = 0; i < args->length(); i++) { 3620 LIRItem* arg = args->at(i); 3621 LIR_Opr loc = cc->at(i); 3622 if (loc->is_register()) { 3623 arg->load_item_force(loc); 3624 } else { 3625 LIR_Address* addr = loc->as_address_ptr(); 3626 arg->load_for_store(addr->type()); 3627 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 3628 __ unaligned_move(arg->result(), addr); 3629 } else { 3630 __ move(arg->result(), addr); 3631 } 3632 } 3633 } 3634 3635 if (info) { 3636 __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info); 3637 } else { 3638 __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args()); 3639 } 3640 if (result->is_valid()) { 3641 __ move(phys_reg, result); 3642 } 3643 return result; 3644 } 3645 3646 void LIRGenerator::do_MemBar(MemBar* x) { 3647 if (os::is_MP()) { 3648 LIR_Code code = x->code(); 3649 switch(code) { 3650 case lir_membar_acquire : __ membar_acquire(); break; 3651 case lir_membar_release : __ membar_release(); break; 3652 case lir_membar : __ membar(); break; 3653 case lir_membar_loadload : __ membar_loadload(); break; 3654 case lir_membar_storestore: __ membar_storestore(); break; 3655 case lir_membar_loadstore : __ membar_loadstore(); break; 3656 case lir_membar_storeload : __ membar_storeload(); break; 3657 default : ShouldNotReachHere(); break; 3658 } 3659 } 3660 }