1 /* 2 * Copyright (c) 2005, 2018, 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 "ci/ciUtilities.hpp" 37 #include "ci/ciValueArrayKlass.hpp" 38 #include "ci/ciValueKlass.hpp" 39 #include "gc/shared/barrierSet.hpp" 40 #include "gc/shared/c1/barrierSetC1.hpp" 41 #include "runtime/arguments.hpp" 42 #include "runtime/sharedRuntime.hpp" 43 #include "runtime/stubRoutines.hpp" 44 #include "runtime/vm_version.hpp" 45 #include "utilities/bitMap.inline.hpp" 46 #include "utilities/macros.hpp" 47 48 #ifdef ASSERT 49 #define __ gen()->lir(__FILE__, __LINE__)-> 50 #else 51 #define __ gen()->lir()-> 52 #endif 53 54 #ifndef PATCHED_ADDR 55 #define PATCHED_ADDR (max_jint) 56 #endif 57 58 void PhiResolverState::reset(int max_vregs) { 59 // Initialize array sizes 60 _virtual_operands.at_put_grow(max_vregs - 1, NULL, NULL); 61 _virtual_operands.trunc_to(0); 62 _other_operands.at_put_grow(max_vregs - 1, NULL, NULL); 63 _other_operands.trunc_to(0); 64 _vreg_table.at_put_grow(max_vregs - 1, NULL, NULL); 65 _vreg_table.trunc_to(0); 66 } 67 68 69 70 //-------------------------------------------------------------- 71 // PhiResolver 72 73 // Resolves cycles: 74 // 75 // r1 := r2 becomes temp := r1 76 // r2 := r1 r1 := r2 77 // r2 := temp 78 // and orders moves: 79 // 80 // r2 := r3 becomes r1 := r2 81 // r1 := r2 r2 := r3 82 83 PhiResolver::PhiResolver(LIRGenerator* gen, int max_vregs) 84 : _gen(gen) 85 , _state(gen->resolver_state()) 86 , _temp(LIR_OprFact::illegalOpr) 87 { 88 // reinitialize the shared state arrays 89 _state.reset(max_vregs); 90 } 91 92 93 void PhiResolver::emit_move(LIR_Opr src, LIR_Opr dest) { 94 assert(src->is_valid(), ""); 95 assert(dest->is_valid(), ""); 96 __ move(src, dest); 97 } 98 99 100 void PhiResolver::move_temp_to(LIR_Opr dest) { 101 assert(_temp->is_valid(), ""); 102 emit_move(_temp, dest); 103 NOT_PRODUCT(_temp = LIR_OprFact::illegalOpr); 104 } 105 106 107 void PhiResolver::move_to_temp(LIR_Opr src) { 108 assert(_temp->is_illegal(), ""); 109 _temp = _gen->new_register(src->type()); 110 emit_move(src, _temp); 111 } 112 113 114 // Traverse assignment graph in depth first order and generate moves in post order 115 // ie. two assignments: b := c, a := b start with node c: 116 // Call graph: move(NULL, c) -> move(c, b) -> move(b, a) 117 // Generates moves in this order: move b to a and move c to b 118 // ie. cycle a := b, b := a start with node a 119 // Call graph: move(NULL, a) -> move(a, b) -> move(b, a) 120 // Generates moves in this order: move b to temp, move a to b, move temp to a 121 void PhiResolver::move(ResolveNode* src, ResolveNode* dest) { 122 if (!dest->visited()) { 123 dest->set_visited(); 124 for (int i = dest->no_of_destinations()-1; i >= 0; i --) { 125 move(dest, dest->destination_at(i)); 126 } 127 } else if (!dest->start_node()) { 128 // cylce in graph detected 129 assert(_loop == NULL, "only one loop valid!"); 130 _loop = dest; 131 move_to_temp(src->operand()); 132 return; 133 } // else dest is a start node 134 135 if (!dest->assigned()) { 136 if (_loop == dest) { 137 move_temp_to(dest->operand()); 138 dest->set_assigned(); 139 } else if (src != NULL) { 140 emit_move(src->operand(), dest->operand()); 141 dest->set_assigned(); 142 } 143 } 144 } 145 146 147 PhiResolver::~PhiResolver() { 148 int i; 149 // resolve any cycles in moves from and to virtual registers 150 for (i = virtual_operands().length() - 1; i >= 0; i --) { 151 ResolveNode* node = virtual_operands().at(i); 152 if (!node->visited()) { 153 _loop = NULL; 154 move(NULL, node); 155 node->set_start_node(); 156 assert(_temp->is_illegal(), "move_temp_to() call missing"); 157 } 158 } 159 160 // generate move for move from non virtual register to abitrary destination 161 for (i = other_operands().length() - 1; i >= 0; i --) { 162 ResolveNode* node = other_operands().at(i); 163 for (int j = node->no_of_destinations() - 1; j >= 0; j --) { 164 emit_move(node->operand(), node->destination_at(j)->operand()); 165 } 166 } 167 } 168 169 170 ResolveNode* PhiResolver::create_node(LIR_Opr opr, bool source) { 171 ResolveNode* node; 172 if (opr->is_virtual()) { 173 int vreg_num = opr->vreg_number(); 174 node = vreg_table().at_grow(vreg_num, NULL); 175 assert(node == NULL || node->operand() == opr, ""); 176 if (node == NULL) { 177 node = new ResolveNode(opr); 178 vreg_table().at_put(vreg_num, node); 179 } 180 // Make sure that all virtual operands show up in the list when 181 // they are used as the source of a move. 182 if (source && !virtual_operands().contains(node)) { 183 virtual_operands().append(node); 184 } 185 } else { 186 assert(source, ""); 187 node = new ResolveNode(opr); 188 other_operands().append(node); 189 } 190 return node; 191 } 192 193 194 void PhiResolver::move(LIR_Opr src, LIR_Opr dest) { 195 assert(dest->is_virtual(), ""); 196 // tty->print("move "); src->print(); tty->print(" to "); dest->print(); tty->cr(); 197 assert(src->is_valid(), ""); 198 assert(dest->is_valid(), ""); 199 ResolveNode* source = source_node(src); 200 source->append(destination_node(dest)); 201 } 202 203 204 //-------------------------------------------------------------- 205 // LIRItem 206 207 void LIRItem::set_result(LIR_Opr opr) { 208 assert(value()->operand()->is_illegal() || value()->operand()->is_constant(), "operand should never change"); 209 value()->set_operand(opr); 210 211 if (opr->is_virtual()) { 212 _gen->_instruction_for_operand.at_put_grow(opr->vreg_number(), value(), NULL); 213 } 214 215 _result = opr; 216 } 217 218 void LIRItem::load_item() { 219 if (result()->is_illegal()) { 220 // update the items result 221 _result = value()->operand(); 222 } 223 if (!result()->is_register()) { 224 LIR_Opr reg = _gen->new_register(value()->type()); 225 __ move(result(), reg); 226 if (result()->is_constant()) { 227 _result = reg; 228 } else { 229 set_result(reg); 230 } 231 } 232 } 233 234 235 void LIRItem::load_for_store(BasicType type) { 236 if (_gen->can_store_as_constant(value(), type)) { 237 _result = value()->operand(); 238 if (!_result->is_constant()) { 239 _result = LIR_OprFact::value_type(value()->type()); 240 } 241 } else if (type == T_BYTE || type == T_BOOLEAN) { 242 load_byte_item(); 243 } else { 244 load_item(); 245 } 246 } 247 248 void LIRItem::load_item_force(LIR_Opr reg) { 249 LIR_Opr r = result(); 250 if (r != reg) { 251 #if !defined(ARM) && !defined(E500V2) 252 if (r->type() != reg->type()) { 253 // moves between different types need an intervening spill slot 254 r = _gen->force_to_spill(r, reg->type()); 255 } 256 #endif 257 __ move(r, reg); 258 _result = reg; 259 } 260 } 261 262 ciObject* LIRItem::get_jobject_constant() const { 263 ObjectType* oc = type()->as_ObjectType(); 264 if (oc) { 265 return oc->constant_value(); 266 } 267 return NULL; 268 } 269 270 271 jint LIRItem::get_jint_constant() const { 272 assert(is_constant() && value() != NULL, ""); 273 assert(type()->as_IntConstant() != NULL, "type check"); 274 return type()->as_IntConstant()->value(); 275 } 276 277 278 jint LIRItem::get_address_constant() const { 279 assert(is_constant() && value() != NULL, ""); 280 assert(type()->as_AddressConstant() != NULL, "type check"); 281 return type()->as_AddressConstant()->value(); 282 } 283 284 285 jfloat LIRItem::get_jfloat_constant() const { 286 assert(is_constant() && value() != NULL, ""); 287 assert(type()->as_FloatConstant() != NULL, "type check"); 288 return type()->as_FloatConstant()->value(); 289 } 290 291 292 jdouble LIRItem::get_jdouble_constant() const { 293 assert(is_constant() && value() != NULL, ""); 294 assert(type()->as_DoubleConstant() != NULL, "type check"); 295 return type()->as_DoubleConstant()->value(); 296 } 297 298 299 jlong LIRItem::get_jlong_constant() const { 300 assert(is_constant() && value() != NULL, ""); 301 assert(type()->as_LongConstant() != NULL, "type check"); 302 return type()->as_LongConstant()->value(); 303 } 304 305 306 307 //-------------------------------------------------------------- 308 309 310 void LIRGenerator::block_do_prolog(BlockBegin* block) { 311 #ifndef PRODUCT 312 if (PrintIRWithLIR) { 313 block->print(); 314 } 315 #endif 316 317 // set up the list of LIR instructions 318 assert(block->lir() == NULL, "LIR list already computed for this block"); 319 _lir = new LIR_List(compilation(), block); 320 block->set_lir(_lir); 321 322 __ branch_destination(block->label()); 323 324 if (LIRTraceExecution && 325 Compilation::current()->hir()->start()->block_id() != block->block_id() && 326 !block->is_set(BlockBegin::exception_entry_flag)) { 327 assert(block->lir()->instructions_list()->length() == 1, "should come right after br_dst"); 328 trace_block_entry(block); 329 } 330 } 331 332 333 void LIRGenerator::block_do_epilog(BlockBegin* block) { 334 #ifndef PRODUCT 335 if (PrintIRWithLIR) { 336 tty->cr(); 337 } 338 #endif 339 340 // LIR_Opr for unpinned constants shouldn't be referenced by other 341 // blocks so clear them out after processing the block. 342 for (int i = 0; i < _unpinned_constants.length(); i++) { 343 _unpinned_constants.at(i)->clear_operand(); 344 } 345 _unpinned_constants.trunc_to(0); 346 347 // clear our any registers for other local constants 348 _constants.trunc_to(0); 349 _reg_for_constants.trunc_to(0); 350 } 351 352 353 void LIRGenerator::block_do(BlockBegin* block) { 354 CHECK_BAILOUT(); 355 356 block_do_prolog(block); 357 set_block(block); 358 359 for (Instruction* instr = block; instr != NULL; instr = instr->next()) { 360 if (instr->is_pinned()) do_root(instr); 361 } 362 363 set_block(NULL); 364 block_do_epilog(block); 365 } 366 367 368 //-------------------------LIRGenerator----------------------------- 369 370 // This is where the tree-walk starts; instr must be root; 371 void LIRGenerator::do_root(Value instr) { 372 CHECK_BAILOUT(); 373 374 InstructionMark im(compilation(), instr); 375 376 assert(instr->is_pinned(), "use only with roots"); 377 assert(instr->subst() == instr, "shouldn't have missed substitution"); 378 379 instr->visit(this); 380 381 assert(!instr->has_uses() || instr->operand()->is_valid() || 382 instr->as_Constant() != NULL || bailed_out(), "invalid item set"); 383 } 384 385 386 // This is called for each node in tree; the walk stops if a root is reached 387 void LIRGenerator::walk(Value instr) { 388 InstructionMark im(compilation(), instr); 389 //stop walk when encounter a root 390 if ((instr->is_pinned() && instr->as_Phi() == NULL) || instr->operand()->is_valid()) { 391 assert(instr->operand() != LIR_OprFact::illegalOpr || instr->as_Constant() != NULL, "this root has not yet been visited"); 392 } else { 393 assert(instr->subst() == instr, "shouldn't have missed substitution"); 394 instr->visit(this); 395 // assert(instr->use_count() > 0 || instr->as_Phi() != NULL, "leaf instruction must have a use"); 396 } 397 } 398 399 400 CodeEmitInfo* LIRGenerator::state_for(Instruction* x, ValueStack* state, bool ignore_xhandler) { 401 assert(state != NULL, "state must be defined"); 402 403 #ifndef PRODUCT 404 state->verify(); 405 #endif 406 407 ValueStack* s = state; 408 for_each_state(s) { 409 if (s->kind() == ValueStack::EmptyExceptionState) { 410 assert(s->stack_size() == 0 && s->locals_size() == 0 && (s->locks_size() == 0 || s->locks_size() == 1), "state must be empty"); 411 continue; 412 } 413 414 int index; 415 Value value; 416 for_each_stack_value(s, index, value) { 417 assert(value->subst() == value, "missed substitution"); 418 if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) { 419 walk(value); 420 assert(value->operand()->is_valid(), "must be evaluated now"); 421 } 422 } 423 424 int bci = s->bci(); 425 IRScope* scope = s->scope(); 426 ciMethod* method = scope->method(); 427 428 MethodLivenessResult liveness = method->liveness_at_bci(bci); 429 if (bci == SynchronizationEntryBCI) { 430 if (x->as_ExceptionObject() || x->as_Throw()) { 431 // all locals are dead on exit from the synthetic unlocker 432 liveness.clear(); 433 } else { 434 assert(x->as_MonitorEnter() || x->as_ProfileInvoke(), "only other cases are MonitorEnter and ProfileInvoke"); 435 } 436 } 437 if (!liveness.is_valid()) { 438 // Degenerate or breakpointed method. 439 bailout("Degenerate or breakpointed method"); 440 } else { 441 assert((int)liveness.size() == s->locals_size(), "error in use of liveness"); 442 for_each_local_value(s, index, value) { 443 assert(value->subst() == value, "missed substition"); 444 if (liveness.at(index) && !value->type()->is_illegal()) { 445 if (!value->is_pinned() && value->as_Constant() == NULL && value->as_Local() == NULL) { 446 walk(value); 447 assert(value->operand()->is_valid(), "must be evaluated now"); 448 } 449 } else { 450 // NULL out this local so that linear scan can assume that all non-NULL values are live. 451 s->invalidate_local(index); 452 } 453 } 454 } 455 } 456 457 return new CodeEmitInfo(state, ignore_xhandler ? NULL : x->exception_handlers(), x->check_flag(Instruction::DeoptimizeOnException)); 458 } 459 460 461 CodeEmitInfo* LIRGenerator::state_for(Instruction* x) { 462 return state_for(x, x->exception_state()); 463 } 464 465 466 void LIRGenerator::klass2reg_with_patching(LIR_Opr r, ciMetadata* obj, CodeEmitInfo* info, bool need_resolve) { 467 /* C2 relies on constant pool entries being resolved (ciTypeFlow), so if TieredCompilation 468 * is active and the class hasn't yet been resolved we need to emit a patch that resolves 469 * the class. */ 470 if ((TieredCompilation && need_resolve) || !obj->is_loaded() || PatchALot) { 471 assert(info != NULL, "info must be set if class is not loaded"); 472 __ klass2reg_patch(NULL, r, info); 473 } else { 474 // no patching needed 475 __ metadata2reg(obj->constant_encoding(), r); 476 } 477 } 478 479 480 void LIRGenerator::array_range_check(LIR_Opr array, LIR_Opr index, 481 CodeEmitInfo* null_check_info, CodeEmitInfo* range_check_info) { 482 CodeStub* stub = new RangeCheckStub(range_check_info, index, array); 483 if (index->is_constant()) { 484 cmp_mem_int(lir_cond_belowEqual, array, arrayOopDesc::length_offset_in_bytes(), 485 index->as_jint(), null_check_info); 486 __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch 487 } else { 488 cmp_reg_mem(lir_cond_aboveEqual, index, array, 489 arrayOopDesc::length_offset_in_bytes(), T_INT, null_check_info); 490 __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch 491 } 492 } 493 494 495 void LIRGenerator::nio_range_check(LIR_Opr buffer, LIR_Opr index, LIR_Opr result, CodeEmitInfo* info) { 496 CodeStub* stub = new RangeCheckStub(info, index); 497 if (index->is_constant()) { 498 cmp_mem_int(lir_cond_belowEqual, buffer, java_nio_Buffer::limit_offset(), index->as_jint(), info); 499 __ branch(lir_cond_belowEqual, T_INT, stub); // forward branch 500 } else { 501 cmp_reg_mem(lir_cond_aboveEqual, index, buffer, 502 java_nio_Buffer::limit_offset(), T_INT, info); 503 __ branch(lir_cond_aboveEqual, T_INT, stub); // forward branch 504 } 505 __ move(index, result); 506 } 507 508 509 510 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) { 511 LIR_Opr result_op = result; 512 LIR_Opr left_op = left; 513 LIR_Opr right_op = right; 514 515 if (TwoOperandLIRForm && left_op != result_op) { 516 assert(right_op != result_op, "malformed"); 517 __ move(left_op, result_op); 518 left_op = result_op; 519 } 520 521 switch(code) { 522 case Bytecodes::_dadd: 523 case Bytecodes::_fadd: 524 case Bytecodes::_ladd: 525 case Bytecodes::_iadd: __ add(left_op, right_op, result_op); break; 526 case Bytecodes::_fmul: 527 case Bytecodes::_lmul: __ mul(left_op, right_op, result_op); break; 528 529 case Bytecodes::_dmul: 530 { 531 if (is_strictfp) { 532 __ mul_strictfp(left_op, right_op, result_op, tmp_op); break; 533 } else { 534 __ mul(left_op, right_op, result_op); break; 535 } 536 } 537 break; 538 539 case Bytecodes::_imul: 540 { 541 bool did_strength_reduce = false; 542 543 if (right->is_constant()) { 544 jint c = right->as_jint(); 545 if (c > 0 && is_power_of_2(c)) { 546 // do not need tmp here 547 __ shift_left(left_op, exact_log2(c), result_op); 548 did_strength_reduce = true; 549 } else { 550 did_strength_reduce = strength_reduce_multiply(left_op, c, result_op, tmp_op); 551 } 552 } 553 // we couldn't strength reduce so just emit the multiply 554 if (!did_strength_reduce) { 555 __ mul(left_op, right_op, result_op); 556 } 557 } 558 break; 559 560 case Bytecodes::_dsub: 561 case Bytecodes::_fsub: 562 case Bytecodes::_lsub: 563 case Bytecodes::_isub: __ sub(left_op, right_op, result_op); break; 564 565 case Bytecodes::_fdiv: __ div (left_op, right_op, result_op); break; 566 // ldiv and lrem are implemented with a direct runtime call 567 568 case Bytecodes::_ddiv: 569 { 570 if (is_strictfp) { 571 __ div_strictfp (left_op, right_op, result_op, tmp_op); break; 572 } else { 573 __ div (left_op, right_op, result_op); break; 574 } 575 } 576 break; 577 578 case Bytecodes::_drem: 579 case Bytecodes::_frem: __ rem (left_op, right_op, result_op); break; 580 581 default: ShouldNotReachHere(); 582 } 583 } 584 585 586 void LIRGenerator::arithmetic_op_int(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, LIR_Opr tmp) { 587 arithmetic_op(code, result, left, right, false, tmp); 588 } 589 590 591 void LIRGenerator::arithmetic_op_long(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, CodeEmitInfo* info) { 592 arithmetic_op(code, result, left, right, false, LIR_OprFact::illegalOpr, info); 593 } 594 595 596 void LIRGenerator::arithmetic_op_fpu(Bytecodes::Code code, LIR_Opr result, LIR_Opr left, LIR_Opr right, bool is_strictfp, LIR_Opr tmp) { 597 arithmetic_op(code, result, left, right, is_strictfp, tmp); 598 } 599 600 601 void LIRGenerator::shift_op(Bytecodes::Code code, LIR_Opr result_op, LIR_Opr value, LIR_Opr count, LIR_Opr tmp) { 602 603 if (TwoOperandLIRForm && value != result_op 604 // Only 32bit right shifts require two operand form on S390. 605 S390_ONLY(&& (code == Bytecodes::_ishr || code == Bytecodes::_iushr))) { 606 assert(count != result_op, "malformed"); 607 __ move(value, result_op); 608 value = result_op; 609 } 610 611 assert(count->is_constant() || count->is_register(), "must be"); 612 switch(code) { 613 case Bytecodes::_ishl: 614 case Bytecodes::_lshl: __ shift_left(value, count, result_op, tmp); break; 615 case Bytecodes::_ishr: 616 case Bytecodes::_lshr: __ shift_right(value, count, result_op, tmp); break; 617 case Bytecodes::_iushr: 618 case Bytecodes::_lushr: __ unsigned_shift_right(value, count, result_op, tmp); break; 619 default: ShouldNotReachHere(); 620 } 621 } 622 623 624 void LIRGenerator::logic_op (Bytecodes::Code code, LIR_Opr result_op, LIR_Opr left_op, LIR_Opr right_op) { 625 if (TwoOperandLIRForm && left_op != result_op) { 626 assert(right_op != result_op, "malformed"); 627 __ move(left_op, result_op); 628 left_op = result_op; 629 } 630 631 switch(code) { 632 case Bytecodes::_iand: 633 case Bytecodes::_land: __ logical_and(left_op, right_op, result_op); break; 634 635 case Bytecodes::_ior: 636 case Bytecodes::_lor: __ logical_or(left_op, right_op, result_op); break; 637 638 case Bytecodes::_ixor: 639 case Bytecodes::_lxor: __ logical_xor(left_op, right_op, result_op); break; 640 641 default: ShouldNotReachHere(); 642 } 643 } 644 645 646 void LIRGenerator::monitor_enter(LIR_Opr object, LIR_Opr lock, LIR_Opr hdr, LIR_Opr scratch, int monitor_no, 647 CodeEmitInfo* info_for_exception, CodeEmitInfo* info, CodeStub* throw_imse_stub) { 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, throw_imse_stub, scratch); 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, throw_imse_stub); 654 } 655 656 657 void LIRGenerator::monitor_exit(LIR_Opr object, LIR_Opr lock, LIR_Opr new_hdr, LIR_Opr scratch, int monitor_no) { 658 if (!GenerateSynchronizationCode) return; 659 // setup registers 660 LIR_Opr hdr = lock; 661 lock = new_hdr; 662 CodeStub* slow_path = new MonitorExitStub(lock, UseFastLocking, monitor_no); 663 __ load_stack_address_monitor(monitor_no, lock); 664 __ unlock_object(hdr, object, lock, scratch, slow_path); 665 } 666 667 #ifndef PRODUCT 668 void LIRGenerator::print_if_not_loaded(const NewInstance* new_instance) { 669 if (PrintNotLoaded && !new_instance->klass()->is_loaded()) { 670 tty->print_cr(" ###class not loaded at new bci %d", new_instance->printable_bci()); 671 } else if (PrintNotLoaded && (TieredCompilation && new_instance->is_unresolved())) { 672 tty->print_cr(" ###class not resolved at new bci %d", new_instance->printable_bci()); 673 } 674 } 675 #endif 676 677 void LIRGenerator::new_instance(LIR_Opr dst, ciInstanceKlass* klass, bool is_unresolved, LIR_Opr scratch1, LIR_Opr scratch2, LIR_Opr scratch3, LIR_Opr scratch4, LIR_Opr klass_reg, CodeEmitInfo* info) { 678 klass2reg_with_patching(klass_reg, klass, info, is_unresolved); 679 // If klass is not loaded we do not know if the klass has finalizers: 680 if (UseFastNewInstance && klass->is_loaded() 681 && !Klass::layout_helper_needs_slow_path(klass->layout_helper())) { 682 683 Runtime1::StubID stub_id = klass->is_initialized() ? Runtime1::fast_new_instance_id : Runtime1::fast_new_instance_init_check_id; 684 685 CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, stub_id); 686 687 assert(klass->is_loaded(), "must be loaded"); 688 // allocate space for instance 689 assert(klass->size_helper() >= 0, "illegal instance size"); 690 const int instance_size = align_object_size(klass->size_helper()); 691 __ allocate_object(dst, scratch1, scratch2, scratch3, scratch4, 692 oopDesc::header_size(), instance_size, klass_reg, !klass->is_initialized(), slow_path); 693 } else { 694 CodeStub* slow_path = new NewInstanceStub(klass_reg, dst, klass, info, Runtime1::new_instance_id); 695 __ branch(lir_cond_always, T_ILLEGAL, slow_path); 696 __ branch_destination(slow_path->continuation()); 697 } 698 } 699 700 701 static bool is_constant_zero(Instruction* inst) { 702 IntConstant* c = inst->type()->as_IntConstant(); 703 if (c) { 704 return (c->value() == 0); 705 } 706 return false; 707 } 708 709 710 static bool positive_constant(Instruction* inst) { 711 IntConstant* c = inst->type()->as_IntConstant(); 712 if (c) { 713 return (c->value() >= 0); 714 } 715 return false; 716 } 717 718 719 static ciArrayKlass* as_array_klass(ciType* type) { 720 if (type != NULL && type->is_array_klass() && type->is_loaded()) { 721 return (ciArrayKlass*)type; 722 } else { 723 return NULL; 724 } 725 } 726 727 static ciType* phi_declared_type(Phi* phi) { 728 ciType* t = phi->operand_at(0)->declared_type(); 729 if (t == NULL) { 730 return NULL; 731 } 732 for(int i = 1; i < phi->operand_count(); i++) { 733 if (t != phi->operand_at(i)->declared_type()) { 734 return NULL; 735 } 736 } 737 return t; 738 } 739 740 void LIRGenerator::arraycopy_helper(Intrinsic* x, int* flagsp, ciArrayKlass** expected_typep) { 741 Instruction* src = x->argument_at(0); 742 Instruction* src_pos = x->argument_at(1); 743 Instruction* dst = x->argument_at(2); 744 Instruction* dst_pos = x->argument_at(3); 745 Instruction* length = x->argument_at(4); 746 747 // first try to identify the likely type of the arrays involved 748 ciArrayKlass* expected_type = NULL; 749 bool is_exact = false, src_objarray = false, dst_objarray = false; 750 { 751 ciArrayKlass* src_exact_type = as_array_klass(src->exact_type()); 752 ciArrayKlass* src_declared_type = as_array_klass(src->declared_type()); 753 Phi* phi; 754 if (src_declared_type == NULL && (phi = src->as_Phi()) != NULL) { 755 src_declared_type = as_array_klass(phi_declared_type(phi)); 756 } 757 ciArrayKlass* dst_exact_type = as_array_klass(dst->exact_type()); 758 ciArrayKlass* dst_declared_type = as_array_klass(dst->declared_type()); 759 if (dst_declared_type == NULL && (phi = dst->as_Phi()) != NULL) { 760 dst_declared_type = as_array_klass(phi_declared_type(phi)); 761 } 762 763 if (src_exact_type != NULL && src_exact_type == dst_exact_type) { 764 // the types exactly match so the type is fully known 765 is_exact = true; 766 expected_type = src_exact_type; 767 } else if (dst_exact_type != NULL && dst_exact_type->is_obj_array_klass()) { 768 ciArrayKlass* dst_type = (ciArrayKlass*) dst_exact_type; 769 ciArrayKlass* src_type = NULL; 770 if (src_exact_type != NULL && src_exact_type->is_obj_array_klass()) { 771 src_type = (ciArrayKlass*) src_exact_type; 772 } else if (src_declared_type != NULL && src_declared_type->is_obj_array_klass()) { 773 src_type = (ciArrayKlass*) src_declared_type; 774 } 775 if (src_type != NULL) { 776 if (src_type->element_type()->is_subtype_of(dst_type->element_type())) { 777 is_exact = true; 778 expected_type = dst_type; 779 } 780 } 781 } 782 // at least pass along a good guess 783 if (expected_type == NULL) expected_type = dst_exact_type; 784 if (expected_type == NULL) expected_type = src_declared_type; 785 if (expected_type == NULL) expected_type = dst_declared_type; 786 787 src_objarray = (src_exact_type && src_exact_type->is_obj_array_klass()) || (src_declared_type && src_declared_type->is_obj_array_klass()); 788 dst_objarray = (dst_exact_type && dst_exact_type->is_obj_array_klass()) || (dst_declared_type && dst_declared_type->is_obj_array_klass()); 789 } 790 791 // if a probable array type has been identified, figure out if any 792 // of the required checks for a fast case can be elided. 793 int flags = LIR_OpArrayCopy::all_flags; 794 795 if (!src_objarray) 796 flags &= ~LIR_OpArrayCopy::src_objarray; 797 if (!dst_objarray) 798 flags &= ~LIR_OpArrayCopy::dst_objarray; 799 800 if (!x->arg_needs_null_check(0)) 801 flags &= ~LIR_OpArrayCopy::src_null_check; 802 if (!x->arg_needs_null_check(2)) 803 flags &= ~LIR_OpArrayCopy::dst_null_check; 804 805 806 if (expected_type != NULL) { 807 Value length_limit = NULL; 808 809 IfOp* ifop = length->as_IfOp(); 810 if (ifop != NULL) { 811 // look for expressions like min(v, a.length) which ends up as 812 // x > y ? y : x or x >= y ? y : x 813 if ((ifop->cond() == If::gtr || ifop->cond() == If::geq) && 814 ifop->x() == ifop->fval() && 815 ifop->y() == ifop->tval()) { 816 length_limit = ifop->y(); 817 } 818 } 819 820 // try to skip null checks and range checks 821 NewArray* src_array = src->as_NewArray(); 822 if (src_array != NULL) { 823 flags &= ~LIR_OpArrayCopy::src_null_check; 824 if (length_limit != NULL && 825 src_array->length() == length_limit && 826 is_constant_zero(src_pos)) { 827 flags &= ~LIR_OpArrayCopy::src_range_check; 828 } 829 } 830 831 NewArray* dst_array = dst->as_NewArray(); 832 if (dst_array != NULL) { 833 flags &= ~LIR_OpArrayCopy::dst_null_check; 834 if (length_limit != NULL && 835 dst_array->length() == length_limit && 836 is_constant_zero(dst_pos)) { 837 flags &= ~LIR_OpArrayCopy::dst_range_check; 838 } 839 } 840 841 // check from incoming constant values 842 if (positive_constant(src_pos)) 843 flags &= ~LIR_OpArrayCopy::src_pos_positive_check; 844 if (positive_constant(dst_pos)) 845 flags &= ~LIR_OpArrayCopy::dst_pos_positive_check; 846 if (positive_constant(length)) 847 flags &= ~LIR_OpArrayCopy::length_positive_check; 848 849 // see if the range check can be elided, which might also imply 850 // that src or dst is non-null. 851 ArrayLength* al = length->as_ArrayLength(); 852 if (al != NULL) { 853 if (al->array() == src) { 854 // it's the length of the source array 855 flags &= ~LIR_OpArrayCopy::length_positive_check; 856 flags &= ~LIR_OpArrayCopy::src_null_check; 857 if (is_constant_zero(src_pos)) 858 flags &= ~LIR_OpArrayCopy::src_range_check; 859 } 860 if (al->array() == dst) { 861 // it's the length of the destination array 862 flags &= ~LIR_OpArrayCopy::length_positive_check; 863 flags &= ~LIR_OpArrayCopy::dst_null_check; 864 if (is_constant_zero(dst_pos)) 865 flags &= ~LIR_OpArrayCopy::dst_range_check; 866 } 867 } 868 if (is_exact) { 869 flags &= ~LIR_OpArrayCopy::type_check; 870 } 871 } 872 873 IntConstant* src_int = src_pos->type()->as_IntConstant(); 874 IntConstant* dst_int = dst_pos->type()->as_IntConstant(); 875 if (src_int && dst_int) { 876 int s_offs = src_int->value(); 877 int d_offs = dst_int->value(); 878 if (src_int->value() >= dst_int->value()) { 879 flags &= ~LIR_OpArrayCopy::overlapping; 880 } 881 if (expected_type != NULL) { 882 BasicType t = expected_type->element_type()->basic_type(); 883 int element_size = type2aelembytes(t); 884 if (((arrayOopDesc::base_offset_in_bytes(t) + s_offs * element_size) % HeapWordSize == 0) && 885 ((arrayOopDesc::base_offset_in_bytes(t) + d_offs * element_size) % HeapWordSize == 0)) { 886 flags &= ~LIR_OpArrayCopy::unaligned; 887 } 888 } 889 } else if (src_pos == dst_pos || is_constant_zero(dst_pos)) { 890 // src and dest positions are the same, or dst is zero so assume 891 // nonoverlapping copy. 892 flags &= ~LIR_OpArrayCopy::overlapping; 893 } 894 895 if (src == dst) { 896 // moving within a single array so no type checks are needed 897 if (flags & LIR_OpArrayCopy::type_check) { 898 flags &= ~LIR_OpArrayCopy::type_check; 899 } 900 } 901 *flagsp = flags; 902 *expected_typep = (ciArrayKlass*)expected_type; 903 } 904 905 906 LIR_Opr LIRGenerator::round_item(LIR_Opr opr) { 907 assert(opr->is_register(), "why spill if item is not register?"); 908 909 if (RoundFPResults && UseSSE < 1 && opr->is_single_fpu()) { 910 LIR_Opr result = new_register(T_FLOAT); 911 set_vreg_flag(result, must_start_in_memory); 912 assert(opr->is_register(), "only a register can be spilled"); 913 assert(opr->value_type()->is_float(), "rounding only for floats available"); 914 __ roundfp(opr, LIR_OprFact::illegalOpr, result); 915 return result; 916 } 917 return opr; 918 } 919 920 921 LIR_Opr LIRGenerator::force_to_spill(LIR_Opr value, BasicType t) { 922 assert(type2size[t] == type2size[value->type()], 923 "size mismatch: t=%s, value->type()=%s", type2name(t), type2name(value->type())); 924 if (!value->is_register()) { 925 // force into a register 926 LIR_Opr r = new_register(value->type()); 927 __ move(value, r); 928 value = r; 929 } 930 931 // create a spill location 932 LIR_Opr tmp = new_register(t); 933 set_vreg_flag(tmp, LIRGenerator::must_start_in_memory); 934 935 // move from register to spill 936 __ move(value, tmp); 937 return tmp; 938 } 939 940 void LIRGenerator::profile_branch(If* if_instr, If::Condition cond) { 941 if (if_instr->should_profile()) { 942 ciMethod* method = if_instr->profiled_method(); 943 assert(method != NULL, "method should be set if branch is profiled"); 944 ciMethodData* md = method->method_data_or_null(); 945 assert(md != NULL, "Sanity"); 946 ciProfileData* data = md->bci_to_data(if_instr->profiled_bci()); 947 assert(data != NULL, "must have profiling data"); 948 assert(data->is_BranchData(), "need BranchData for two-way branches"); 949 int taken_count_offset = md->byte_offset_of_slot(data, BranchData::taken_offset()); 950 int not_taken_count_offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset()); 951 if (if_instr->is_swapped()) { 952 int t = taken_count_offset; 953 taken_count_offset = not_taken_count_offset; 954 not_taken_count_offset = t; 955 } 956 957 LIR_Opr md_reg = new_register(T_METADATA); 958 __ metadata2reg(md->constant_encoding(), md_reg); 959 960 LIR_Opr data_offset_reg = new_pointer_register(); 961 __ cmove(lir_cond(cond), 962 LIR_OprFact::intptrConst(taken_count_offset), 963 LIR_OprFact::intptrConst(not_taken_count_offset), 964 data_offset_reg, as_BasicType(if_instr->x()->type())); 965 966 // MDO cells are intptr_t, so the data_reg width is arch-dependent. 967 LIR_Opr data_reg = new_pointer_register(); 968 LIR_Address* data_addr = new LIR_Address(md_reg, data_offset_reg, data_reg->type()); 969 __ move(data_addr, data_reg); 970 // Use leal instead of add to avoid destroying condition codes on x86 971 LIR_Address* fake_incr_value = new LIR_Address(data_reg, DataLayout::counter_increment, T_INT); 972 __ leal(LIR_OprFact::address(fake_incr_value), data_reg); 973 __ move(data_reg, data_addr); 974 } 975 } 976 977 // Phi technique: 978 // This is about passing live values from one basic block to the other. 979 // In code generated with Java it is rather rare that more than one 980 // value is on the stack from one basic block to the other. 981 // We optimize our technique for efficient passing of one value 982 // (of type long, int, double..) but it can be extended. 983 // When entering or leaving a basic block, all registers and all spill 984 // slots are release and empty. We use the released registers 985 // and spill slots to pass the live values from one block 986 // to the other. The topmost value, i.e., the value on TOS of expression 987 // stack is passed in registers. All other values are stored in spilling 988 // area. Every Phi has an index which designates its spill slot 989 // At exit of a basic block, we fill the register(s) and spill slots. 990 // At entry of a basic block, the block_prolog sets up the content of phi nodes 991 // and locks necessary registers and spilling slots. 992 993 994 // move current value to referenced phi function 995 void LIRGenerator::move_to_phi(PhiResolver* resolver, Value cur_val, Value sux_val) { 996 Phi* phi = sux_val->as_Phi(); 997 // cur_val can be null without phi being null in conjunction with inlining 998 if (phi != NULL && cur_val != NULL && cur_val != phi && !phi->is_illegal()) { 999 Phi* cur_phi = cur_val->as_Phi(); 1000 if (cur_phi != NULL && cur_phi->is_illegal()) { 1001 // Phi and local would need to get invalidated 1002 // (which is unexpected for Linear Scan). 1003 // But this case is very rare so we simply bail out. 1004 bailout("propagation of illegal phi"); 1005 return; 1006 } 1007 LIR_Opr operand = cur_val->operand(); 1008 if (operand->is_illegal()) { 1009 assert(cur_val->as_Constant() != NULL || cur_val->as_Local() != NULL, 1010 "these can be produced lazily"); 1011 operand = operand_for_instruction(cur_val); 1012 } 1013 resolver->move(operand, operand_for_instruction(phi)); 1014 } 1015 } 1016 1017 1018 // Moves all stack values into their PHI position 1019 void LIRGenerator::move_to_phi(ValueStack* cur_state) { 1020 BlockBegin* bb = block(); 1021 if (bb->number_of_sux() == 1) { 1022 BlockBegin* sux = bb->sux_at(0); 1023 assert(sux->number_of_preds() > 0, "invalid CFG"); 1024 1025 // a block with only one predecessor never has phi functions 1026 if (sux->number_of_preds() > 1) { 1027 int max_phis = cur_state->stack_size() + cur_state->locals_size(); 1028 PhiResolver resolver(this, _virtual_register_number + max_phis * 2); 1029 1030 ValueStack* sux_state = sux->state(); 1031 Value sux_value; 1032 int index; 1033 1034 assert(cur_state->scope() == sux_state->scope(), "not matching"); 1035 assert(cur_state->locals_size() == sux_state->locals_size(), "not matching"); 1036 assert(cur_state->stack_size() == sux_state->stack_size(), "not matching"); 1037 1038 for_each_stack_value(sux_state, index, sux_value) { 1039 move_to_phi(&resolver, cur_state->stack_at(index), sux_value); 1040 } 1041 1042 for_each_local_value(sux_state, index, sux_value) { 1043 move_to_phi(&resolver, cur_state->local_at(index), sux_value); 1044 } 1045 1046 assert(cur_state->caller_state() == sux_state->caller_state(), "caller states must be equal"); 1047 } 1048 } 1049 } 1050 1051 1052 LIR_Opr LIRGenerator::new_register(BasicType type) { 1053 int vreg = _virtual_register_number; 1054 // add a little fudge factor for the bailout, since the bailout is 1055 // only checked periodically. This gives a few extra registers to 1056 // hand out before we really run out, which helps us keep from 1057 // tripping over assertions. 1058 if (vreg + 20 >= LIR_OprDesc::vreg_max) { 1059 bailout("out of virtual registers"); 1060 if (vreg + 2 >= LIR_OprDesc::vreg_max) { 1061 // wrap it around 1062 _virtual_register_number = LIR_OprDesc::vreg_base; 1063 } 1064 } 1065 _virtual_register_number += 1; 1066 return LIR_OprFact::virtual_register(vreg, type); 1067 } 1068 1069 1070 // Try to lock using register in hint 1071 LIR_Opr LIRGenerator::rlock(Value instr) { 1072 return new_register(instr->type()); 1073 } 1074 1075 1076 // does an rlock and sets result 1077 LIR_Opr LIRGenerator::rlock_result(Value x) { 1078 LIR_Opr reg = rlock(x); 1079 set_result(x, reg); 1080 return reg; 1081 } 1082 1083 1084 // does an rlock and sets result 1085 LIR_Opr LIRGenerator::rlock_result(Value x, BasicType type) { 1086 LIR_Opr reg; 1087 switch (type) { 1088 case T_BYTE: 1089 case T_BOOLEAN: 1090 reg = rlock_byte(type); 1091 break; 1092 default: 1093 reg = rlock(x); 1094 break; 1095 } 1096 1097 set_result(x, reg); 1098 return reg; 1099 } 1100 1101 1102 //--------------------------------------------------------------------- 1103 ciObject* LIRGenerator::get_jobject_constant(Value value) { 1104 ObjectType* oc = value->type()->as_ObjectType(); 1105 if (oc) { 1106 return oc->constant_value(); 1107 } 1108 return NULL; 1109 } 1110 1111 1112 void LIRGenerator::do_ExceptionObject(ExceptionObject* x) { 1113 assert(block()->is_set(BlockBegin::exception_entry_flag), "ExceptionObject only allowed in exception handler block"); 1114 assert(block()->next() == x, "ExceptionObject must be first instruction of block"); 1115 1116 // no moves are created for phi functions at the begin of exception 1117 // handlers, so assign operands manually here 1118 for_each_phi_fun(block(), phi, 1119 if (!phi->is_illegal()) { operand_for_instruction(phi); }); 1120 1121 LIR_Opr thread_reg = getThreadPointer(); 1122 __ move_wide(new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT), 1123 exceptionOopOpr()); 1124 __ move_wide(LIR_OprFact::oopConst(NULL), 1125 new LIR_Address(thread_reg, in_bytes(JavaThread::exception_oop_offset()), T_OBJECT)); 1126 __ move_wide(LIR_OprFact::oopConst(NULL), 1127 new LIR_Address(thread_reg, in_bytes(JavaThread::exception_pc_offset()), T_OBJECT)); 1128 1129 LIR_Opr result = new_register(T_OBJECT); 1130 __ move(exceptionOopOpr(), result); 1131 set_result(x, result); 1132 } 1133 1134 1135 //---------------------------------------------------------------------- 1136 //---------------------------------------------------------------------- 1137 //---------------------------------------------------------------------- 1138 //---------------------------------------------------------------------- 1139 // visitor functions 1140 //---------------------------------------------------------------------- 1141 //---------------------------------------------------------------------- 1142 //---------------------------------------------------------------------- 1143 //---------------------------------------------------------------------- 1144 1145 void LIRGenerator::do_Phi(Phi* x) { 1146 // phi functions are never visited directly 1147 ShouldNotReachHere(); 1148 } 1149 1150 1151 // Code for a constant is generated lazily unless the constant is frequently used and can't be inlined. 1152 void LIRGenerator::do_Constant(Constant* x) { 1153 if (x->state_before() != NULL) { 1154 // Any constant with a ValueStack requires patching so emit the patch here 1155 LIR_Opr reg = rlock_result(x); 1156 CodeEmitInfo* info = state_for(x, x->state_before()); 1157 __ oop2reg_patch(NULL, reg, info); 1158 } else if (x->use_count() > 1 && !can_inline_as_constant(x)) { 1159 if (!x->is_pinned()) { 1160 // unpinned constants are handled specially so that they can be 1161 // put into registers when they are used multiple times within a 1162 // block. After the block completes their operand will be 1163 // cleared so that other blocks can't refer to that register. 1164 set_result(x, load_constant(x)); 1165 } else { 1166 LIR_Opr res = x->operand(); 1167 if (!res->is_valid()) { 1168 res = LIR_OprFact::value_type(x->type()); 1169 } 1170 if (res->is_constant()) { 1171 LIR_Opr reg = rlock_result(x); 1172 __ move(res, reg); 1173 } else { 1174 set_result(x, res); 1175 } 1176 } 1177 } else { 1178 set_result(x, LIR_OprFact::value_type(x->type())); 1179 } 1180 } 1181 1182 1183 void LIRGenerator::do_Local(Local* x) { 1184 // operand_for_instruction has the side effect of setting the result 1185 // so there's no need to do it here. 1186 operand_for_instruction(x); 1187 } 1188 1189 1190 void LIRGenerator::do_IfInstanceOf(IfInstanceOf* x) { 1191 Unimplemented(); 1192 } 1193 1194 1195 void LIRGenerator::do_Return(Return* x) { 1196 if (compilation()->env()->dtrace_method_probes()) { 1197 BasicTypeList signature; 1198 signature.append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread 1199 signature.append(T_METADATA); // Method* 1200 LIR_OprList* args = new LIR_OprList(); 1201 args->append(getThreadPointer()); 1202 LIR_Opr meth = new_register(T_METADATA); 1203 __ metadata2reg(method()->constant_encoding(), meth); 1204 args->append(meth); 1205 call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit), voidType, NULL); 1206 } 1207 1208 if (x->type()->is_void()) { 1209 __ return_op(LIR_OprFact::illegalOpr); 1210 } else { 1211 LIR_Opr reg = result_register_for(x->type(), /*callee=*/true); 1212 LIRItem result(x->result(), this); 1213 1214 result.load_item_force(reg); 1215 __ return_op(result.result()); 1216 } 1217 set_no_result(x); 1218 } 1219 1220 // Examble: ref.get() 1221 // Combination of LoadField and g1 pre-write barrier 1222 void LIRGenerator::do_Reference_get(Intrinsic* x) { 1223 1224 const int referent_offset = java_lang_ref_Reference::referent_offset; 1225 guarantee(referent_offset > 0, "referent offset not initialized"); 1226 1227 assert(x->number_of_arguments() == 1, "wrong type"); 1228 1229 LIRItem reference(x->argument_at(0), this); 1230 reference.load_item(); 1231 1232 // need to perform the null check on the reference objecy 1233 CodeEmitInfo* info = NULL; 1234 if (x->needs_null_check()) { 1235 info = state_for(x); 1236 } 1237 1238 LIR_Opr result = rlock_result(x, T_OBJECT); 1239 access_load_at(IN_HEAP | ON_WEAK_OOP_REF, T_OBJECT, 1240 reference, LIR_OprFact::intConst(referent_offset), result); 1241 } 1242 1243 // Example: clazz.isInstance(object) 1244 void LIRGenerator::do_isInstance(Intrinsic* x) { 1245 assert(x->number_of_arguments() == 2, "wrong type"); 1246 1247 // TODO could try to substitute this node with an equivalent InstanceOf 1248 // if clazz is known to be a constant Class. This will pick up newly found 1249 // constants after HIR construction. I'll leave this to a future change. 1250 1251 // as a first cut, make a simple leaf call to runtime to stay platform independent. 1252 // could follow the aastore example in a future change. 1253 1254 LIRItem clazz(x->argument_at(0), this); 1255 LIRItem object(x->argument_at(1), this); 1256 clazz.load_item(); 1257 object.load_item(); 1258 LIR_Opr result = rlock_result(x); 1259 1260 // need to perform null check on clazz 1261 if (x->needs_null_check()) { 1262 CodeEmitInfo* info = state_for(x); 1263 __ null_check(clazz.result(), info); 1264 } 1265 1266 LIR_Opr call_result = call_runtime(clazz.value(), object.value(), 1267 CAST_FROM_FN_PTR(address, Runtime1::is_instance_of), 1268 x->type(), 1269 NULL); // NULL CodeEmitInfo results in a leaf call 1270 __ move(call_result, result); 1271 } 1272 1273 // Example: object.getClass () 1274 void LIRGenerator::do_getClass(Intrinsic* x) { 1275 assert(x->number_of_arguments() == 1, "wrong type"); 1276 1277 LIRItem rcvr(x->argument_at(0), this); 1278 rcvr.load_item(); 1279 LIR_Opr temp = new_register(T_METADATA); 1280 LIR_Opr result = rlock_result(x); 1281 1282 // need to perform the null check on the rcvr 1283 CodeEmitInfo* info = NULL; 1284 if (x->needs_null_check()) { 1285 info = state_for(x); 1286 } 1287 1288 // FIXME T_ADDRESS should actually be T_METADATA but it can't because the 1289 // meaning of these two is mixed up (see JDK-8026837). 1290 __ move(new LIR_Address(rcvr.result(), oopDesc::klass_offset_in_bytes(), T_ADDRESS), temp, info); 1291 __ move_wide(new LIR_Address(temp, in_bytes(Klass::java_mirror_offset()), T_ADDRESS), temp); 1292 // mirror = ((OopHandle)mirror)->resolve(); 1293 access_load(IN_NATIVE, T_OBJECT, 1294 LIR_OprFact::address(new LIR_Address(temp, T_OBJECT)), result); 1295 } 1296 1297 // java.lang.Class::isPrimitive() 1298 void LIRGenerator::do_isPrimitive(Intrinsic* x) { 1299 assert(x->number_of_arguments() == 1, "wrong type"); 1300 1301 LIRItem rcvr(x->argument_at(0), this); 1302 rcvr.load_item(); 1303 LIR_Opr temp = new_register(T_METADATA); 1304 LIR_Opr result = rlock_result(x); 1305 1306 CodeEmitInfo* info = NULL; 1307 if (x->needs_null_check()) { 1308 info = state_for(x); 1309 } 1310 1311 __ move(new LIR_Address(rcvr.result(), java_lang_Class::klass_offset_in_bytes(), T_ADDRESS), temp, info); 1312 __ cmp(lir_cond_notEqual, temp, LIR_OprFact::intConst(0)); 1313 __ cmove(lir_cond_notEqual, LIR_OprFact::intConst(0), LIR_OprFact::intConst(1), result, T_BOOLEAN); 1314 } 1315 1316 1317 // Example: Thread.currentThread() 1318 void LIRGenerator::do_currentThread(Intrinsic* x) { 1319 assert(x->number_of_arguments() == 0, "wrong type"); 1320 LIR_Opr reg = rlock_result(x); 1321 __ move_wide(new LIR_Address(getThreadPointer(), in_bytes(JavaThread::threadObj_offset()), T_OBJECT), reg); 1322 } 1323 1324 1325 void LIRGenerator::do_RegisterFinalizer(Intrinsic* x) { 1326 assert(x->number_of_arguments() == 1, "wrong type"); 1327 LIRItem receiver(x->argument_at(0), this); 1328 1329 receiver.load_item(); 1330 BasicTypeList signature; 1331 signature.append(T_OBJECT); // receiver 1332 LIR_OprList* args = new LIR_OprList(); 1333 args->append(receiver.result()); 1334 CodeEmitInfo* info = state_for(x, x->state()); 1335 call_runtime(&signature, args, 1336 CAST_FROM_FN_PTR(address, Runtime1::entry_for(Runtime1::register_finalizer_id)), 1337 voidType, info); 1338 1339 set_no_result(x); 1340 } 1341 1342 1343 //------------------------local access-------------------------------------- 1344 1345 LIR_Opr LIRGenerator::operand_for_instruction(Instruction* x) { 1346 if (x->operand()->is_illegal()) { 1347 Constant* c = x->as_Constant(); 1348 if (c != NULL) { 1349 x->set_operand(LIR_OprFact::value_type(c->type())); 1350 } else { 1351 assert(x->as_Phi() || x->as_Local() != NULL, "only for Phi and Local"); 1352 // allocate a virtual register for this local or phi 1353 x->set_operand(rlock(x)); 1354 _instruction_for_operand.at_put_grow(x->operand()->vreg_number(), x, NULL); 1355 } 1356 } 1357 return x->operand(); 1358 } 1359 1360 1361 Instruction* LIRGenerator::instruction_for_opr(LIR_Opr opr) { 1362 if (opr->is_virtual()) { 1363 return instruction_for_vreg(opr->vreg_number()); 1364 } 1365 return NULL; 1366 } 1367 1368 1369 Instruction* LIRGenerator::instruction_for_vreg(int reg_num) { 1370 if (reg_num < _instruction_for_operand.length()) { 1371 return _instruction_for_operand.at(reg_num); 1372 } 1373 return NULL; 1374 } 1375 1376 1377 void LIRGenerator::set_vreg_flag(int vreg_num, VregFlag f) { 1378 if (_vreg_flags.size_in_bits() == 0) { 1379 BitMap2D temp(100, num_vreg_flags); 1380 _vreg_flags = temp; 1381 } 1382 _vreg_flags.at_put_grow(vreg_num, f, true); 1383 } 1384 1385 bool LIRGenerator::is_vreg_flag_set(int vreg_num, VregFlag f) { 1386 if (!_vreg_flags.is_valid_index(vreg_num, f)) { 1387 return false; 1388 } 1389 return _vreg_flags.at(vreg_num, f); 1390 } 1391 1392 1393 // Block local constant handling. This code is useful for keeping 1394 // unpinned constants and constants which aren't exposed in the IR in 1395 // registers. Unpinned Constant instructions have their operands 1396 // cleared when the block is finished so that other blocks can't end 1397 // up referring to their registers. 1398 1399 LIR_Opr LIRGenerator::load_constant(Constant* x) { 1400 assert(!x->is_pinned(), "only for unpinned constants"); 1401 _unpinned_constants.append(x); 1402 return load_constant(LIR_OprFact::value_type(x->type())->as_constant_ptr()); 1403 } 1404 1405 1406 LIR_Opr LIRGenerator::load_constant(LIR_Const* c) { 1407 BasicType t = c->type(); 1408 for (int i = 0; i < _constants.length(); i++) { 1409 LIR_Const* other = _constants.at(i); 1410 if (t == other->type()) { 1411 switch (t) { 1412 case T_INT: 1413 case T_FLOAT: 1414 if (c->as_jint_bits() != other->as_jint_bits()) continue; 1415 break; 1416 case T_LONG: 1417 case T_DOUBLE: 1418 if (c->as_jint_hi_bits() != other->as_jint_hi_bits()) continue; 1419 if (c->as_jint_lo_bits() != other->as_jint_lo_bits()) continue; 1420 break; 1421 case T_OBJECT: 1422 if (c->as_jobject() != other->as_jobject()) continue; 1423 break; 1424 default: 1425 break; 1426 } 1427 return _reg_for_constants.at(i); 1428 } 1429 } 1430 1431 LIR_Opr result = new_register(t); 1432 __ move((LIR_Opr)c, result); 1433 _constants.append(c); 1434 _reg_for_constants.append(result); 1435 return result; 1436 } 1437 1438 //------------------------field access-------------------------------------- 1439 1440 void LIRGenerator::do_CompareAndSwap(Intrinsic* x, ValueType* type) { 1441 assert(x->number_of_arguments() == 4, "wrong type"); 1442 LIRItem obj (x->argument_at(0), this); // object 1443 LIRItem offset(x->argument_at(1), this); // offset of field 1444 LIRItem cmp (x->argument_at(2), this); // value to compare with field 1445 LIRItem val (x->argument_at(3), this); // replace field with val if matches cmp 1446 assert(obj.type()->tag() == objectTag, "invalid type"); 1447 1448 // In 64bit the type can be long, sparc doesn't have this assert 1449 // assert(offset.type()->tag() == intTag, "invalid type"); 1450 1451 assert(cmp.type()->tag() == type->tag(), "invalid type"); 1452 assert(val.type()->tag() == type->tag(), "invalid type"); 1453 1454 LIR_Opr result = access_atomic_cmpxchg_at(IN_HEAP, as_BasicType(type), 1455 obj, offset, cmp, val); 1456 set_result(x, result); 1457 } 1458 1459 // Comment copied form templateTable_i486.cpp 1460 // ---------------------------------------------------------------------------- 1461 // Volatile variables demand their effects be made known to all CPU's in 1462 // order. Store buffers on most chips allow reads & writes to reorder; the 1463 // JMM's ReadAfterWrite.java test fails in -Xint mode without some kind of 1464 // memory barrier (i.e., it's not sufficient that the interpreter does not 1465 // reorder volatile references, the hardware also must not reorder them). 1466 // 1467 // According to the new Java Memory Model (JMM): 1468 // (1) All volatiles are serialized wrt to each other. 1469 // ALSO reads & writes act as aquire & release, so: 1470 // (2) A read cannot let unrelated NON-volatile memory refs that happen after 1471 // the read float up to before the read. It's OK for non-volatile memory refs 1472 // that happen before the volatile read to float down below it. 1473 // (3) Similar a volatile write cannot let unrelated NON-volatile memory refs 1474 // that happen BEFORE the write float down to after the write. It's OK for 1475 // non-volatile memory refs that happen after the volatile write to float up 1476 // before it. 1477 // 1478 // We only put in barriers around volatile refs (they are expensive), not 1479 // _between_ memory refs (that would require us to track the flavor of the 1480 // previous memory refs). Requirements (2) and (3) require some barriers 1481 // before volatile stores and after volatile loads. These nearly cover 1482 // requirement (1) but miss the volatile-store-volatile-load case. This final 1483 // case is placed after volatile-stores although it could just as well go 1484 // before volatile-loads. 1485 1486 1487 void LIRGenerator::do_StoreField(StoreField* x) { 1488 bool needs_patching = x->needs_patching(); 1489 bool is_volatile = x->field()->is_volatile(); 1490 BasicType field_type = x->field_type(); 1491 1492 CodeEmitInfo* info = NULL; 1493 if (needs_patching) { 1494 assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access"); 1495 info = state_for(x, x->state_before()); 1496 } else if (x->needs_null_check()) { 1497 NullCheck* nc = x->explicit_null_check(); 1498 if (nc == NULL) { 1499 info = state_for(x); 1500 } else { 1501 info = state_for(nc); 1502 } 1503 } 1504 1505 LIRItem object(x->obj(), this); 1506 LIRItem value(x->value(), this); 1507 1508 object.load_item(); 1509 1510 if (is_volatile || needs_patching) { 1511 // load item if field is volatile (fewer special cases for volatiles) 1512 // load item if field not initialized 1513 // load item if field not constant 1514 // because of code patching we cannot inline constants 1515 if (field_type == T_BYTE || field_type == T_BOOLEAN) { 1516 value.load_byte_item(); 1517 } else { 1518 value.load_item(); 1519 } 1520 } else { 1521 value.load_for_store(field_type); 1522 } 1523 1524 set_no_result(x); 1525 1526 #ifndef PRODUCT 1527 if (PrintNotLoaded && needs_patching) { 1528 tty->print_cr(" ###class not loaded at store_%s bci %d", 1529 x->is_static() ? "static" : "field", x->printable_bci()); 1530 } 1531 #endif 1532 1533 if (x->needs_null_check() && 1534 (needs_patching || 1535 MacroAssembler::needs_explicit_null_check(x->offset()))) { 1536 if (needs_patching && field_type == T_VALUETYPE) { 1537 // We are storing a "Q" field, but the holder class is not yet loaded. 1538 CodeStub* stub = new DeoptimizeStub(new CodeEmitInfo(info), 1539 Deoptimization::Reason_unloaded, 1540 Deoptimization::Action_make_not_entrant); 1541 __ branch(lir_cond_always, T_ILLEGAL, stub); 1542 } else { 1543 // Emit an explicit null check because the offset is too large. 1544 // If the class is not loaded and the object is NULL, we need to deoptimize to throw a 1545 // NoClassDefFoundError in the interpreter instead of an implicit NPE from compiled code. 1546 __ null_check(object.result(), new CodeEmitInfo(info), /* deoptimize */ needs_patching); 1547 } 1548 } 1549 1550 DecoratorSet decorators = IN_HEAP; 1551 if (is_volatile) { 1552 decorators |= MO_SEQ_CST; 1553 } 1554 if (needs_patching) { 1555 decorators |= C1_NEEDS_PATCHING; 1556 } 1557 1558 access_store_at(decorators, field_type, object, LIR_OprFact::intConst(x->offset()), 1559 value.result(), info != NULL ? new CodeEmitInfo(info) : NULL, info); 1560 } 1561 1562 // FIXME -- I can't find any other way to pass an address to access_load_at(). 1563 class TempResolvedAddress: public Instruction { 1564 public: 1565 TempResolvedAddress(ValueType* type, LIR_Opr addr) : Instruction(type) { 1566 set_operand(addr); 1567 } 1568 virtual void input_values_do(ValueVisitor*) {} 1569 virtual void visit(InstructionVisitor* v) {} 1570 virtual const char* name() const { return "TempResolvedAddress"; } 1571 }; 1572 1573 void LIRGenerator::access_flattened_array(bool is_load, LIRItem& array, LIRItem& index, LIRItem& obj_item) { 1574 // Find the starting address of the source (inside the array) 1575 ciType* array_type = array.value()->declared_type(); 1576 ciValueArrayKlass* value_array_klass = array_type->as_value_array_klass(); 1577 assert(value_array_klass->is_loaded(), "must be"); 1578 1579 ciValueKlass* elem_klass = value_array_klass->element_klass()->as_value_klass(); 1580 int array_header_size = value_array_klass->array_header_in_bytes(); 1581 int shift = value_array_klass->log2_element_size(); 1582 1583 #ifndef _LP64 1584 LIR_Opr index_op = new_register(T_INT); 1585 // FIXME -- on 32-bit, the shift below can overflow, so we need to check that 1586 // the top (shift+1) bits of index_op must be zero, or 1587 // else throw ArrayIndexOutOfBoundsException 1588 if (index.result()->is_constant()) { 1589 jint const_index = index.result()->as_jint(); 1590 __ move(LIR_OprFact::intConst(const_index << shift), index_op); 1591 } else { 1592 __ shift_left(index_op, shift, index.result()); 1593 } 1594 #else 1595 LIR_Opr index_op = new_register(T_LONG); 1596 if (index.result()->is_constant()) { 1597 jint const_index = index.result()->as_jint(); 1598 __ move(LIR_OprFact::longConst(const_index << shift), index_op); 1599 } else { 1600 __ convert(Bytecodes::_i2l, index.result(), index_op); 1601 // Need to shift manually, as LIR_Address can scale only up to 3. 1602 __ shift_left(index_op, shift, index_op); 1603 } 1604 #endif 1605 1606 LIR_Opr elm_op = new_pointer_register(); 1607 LIR_Address* elm_address = new LIR_Address(array.result(), index_op, array_header_size, T_ADDRESS); 1608 __ leal(LIR_OprFact::address(elm_address), elm_op); 1609 1610 for (int i = 0; i < elem_klass->nof_nonstatic_fields(); i++) { 1611 ciField* inner_field = elem_klass->nonstatic_field_at(i); 1612 assert(!inner_field->is_flattened(), "flattened fields must have been expanded"); 1613 int obj_offset = inner_field->offset(); 1614 int elm_offset = obj_offset - elem_klass->first_field_offset(); // object header is not stored in array. 1615 1616 BasicType field_type = inner_field->type()->basic_type(); 1617 switch (field_type) { 1618 case T_BYTE: 1619 case T_BOOLEAN: 1620 case T_SHORT: 1621 case T_CHAR: 1622 field_type = T_INT; 1623 break; 1624 default: 1625 break; 1626 } 1627 1628 LIR_Opr temp = new_register(field_type); 1629 TempResolvedAddress* elm_resolved_addr = new TempResolvedAddress(as_ValueType(field_type), elm_op); 1630 LIRItem elm_item(elm_resolved_addr, this); 1631 1632 DecoratorSet decorators = IN_HEAP; 1633 if (is_load) { 1634 access_load_at(decorators, field_type, 1635 elm_item, LIR_OprFact::intConst(elm_offset), temp, 1636 NULL, NULL); 1637 access_store_at(decorators, field_type, 1638 obj_item, LIR_OprFact::intConst(obj_offset), temp, 1639 NULL, NULL); 1640 } else { 1641 access_load_at(decorators, field_type, 1642 obj_item, LIR_OprFact::intConst(obj_offset), temp, 1643 NULL, NULL); 1644 access_store_at(decorators, field_type, 1645 elm_item, LIR_OprFact::intConst(elm_offset), temp, 1646 NULL, NULL); 1647 } 1648 } 1649 } 1650 1651 void LIRGenerator::maybe_deopt_value_array_access(LIRItem& array, CodeEmitInfo* null_check_info, CodeEmitInfo* deopt_info) { 1652 LIR_Opr klass = new_register(T_METADATA); 1653 __ move(new LIR_Address(array.result(), oopDesc::klass_offset_in_bytes(), T_ADDRESS), klass, null_check_info); 1654 LIR_Opr layout = new_register(T_INT); 1655 __ move(new LIR_Address(klass, in_bytes(Klass::layout_helper_offset()), T_INT), layout); 1656 __ shift_right(layout, Klass::_lh_array_tag_shift, layout); 1657 __ cmp(lir_cond_equal, layout, LIR_OprFact::intConst(Klass::_lh_array_tag_vt_value)); 1658 1659 CodeStub* stub = new DeoptimizeStub(deopt_info, Deoptimization::Reason_unloaded, Deoptimization::Action_make_not_entrant); 1660 __ branch(lir_cond_equal, T_ILLEGAL, stub); 1661 } 1662 1663 void LIRGenerator::do_StoreIndexed(StoreIndexed* x) { 1664 assert(x->is_pinned(),""); 1665 bool is_flattened = x->array()->is_flattened_array(); 1666 bool needs_range_check = x->compute_needs_range_check(); 1667 bool use_length = x->length() != NULL; 1668 bool obj_store = x->elt_type() == T_ARRAY || x->elt_type() == T_OBJECT; 1669 bool needs_store_check = obj_store && !is_flattened && 1670 (x->value()->as_Constant() == NULL || 1671 !get_jobject_constant(x->value())->is_null_object() || 1672 x->should_profile()); 1673 1674 LIRItem array(x->array(), this); 1675 LIRItem index(x->index(), this); 1676 LIRItem value(x->value(), this); 1677 LIRItem length(this); 1678 1679 array.load_item(); 1680 index.load_nonconstant(); 1681 1682 if (use_length && needs_range_check) { 1683 length.set_instruction(x->length()); 1684 length.load_item(); 1685 1686 } 1687 1688 if (needs_store_check || x->check_boolean() || is_flattened) { 1689 value.load_item(); 1690 } else { 1691 value.load_for_store(x->elt_type()); 1692 } 1693 1694 set_no_result(x); 1695 1696 // the CodeEmitInfo must be duplicated for each different 1697 // LIR-instruction because spilling can occur anywhere between two 1698 // instructions and so the debug information must be different 1699 CodeEmitInfo* range_check_info = state_for(x); 1700 CodeEmitInfo* null_check_info = NULL; 1701 if (x->needs_null_check()) { 1702 null_check_info = new CodeEmitInfo(range_check_info); 1703 } 1704 1705 if (GenerateRangeChecks && needs_range_check) { 1706 if (use_length) { 1707 __ cmp(lir_cond_belowEqual, length.result(), index.result()); 1708 __ branch(lir_cond_belowEqual, T_INT, new RangeCheckStub(range_check_info, index.result(), array.result())); 1709 } else { 1710 array_range_check(array.result(), index.result(), null_check_info, range_check_info); 1711 // range_check also does the null check 1712 null_check_info = NULL; 1713 } 1714 } 1715 1716 if (GenerateArrayStoreCheck && needs_store_check) { 1717 CodeEmitInfo* store_check_info = new CodeEmitInfo(range_check_info); 1718 array_store_check(value.result(), array.result(), store_check_info, x->profiled_method(), x->profiled_bci()); 1719 } 1720 1721 if (is_flattened) { 1722 if (x->array()->declared_type()->is_loaded()) { 1723 index.load_item(); 1724 access_flattened_array(false, array, index, value); 1725 return; 1726 } else { 1727 // If the array is indeed flattened, deopt. Otherwise access it as a normal object array. 1728 CodeEmitInfo* deopt_info = state_for(x, x->state_before()); 1729 maybe_deopt_value_array_access(array, null_check_info, deopt_info); 1730 } 1731 } 1732 1733 DecoratorSet decorators = IN_HEAP | IS_ARRAY; 1734 if (x->check_boolean()) { 1735 decorators |= C1_MASK_BOOLEAN; 1736 } 1737 1738 access_store_at(decorators, x->elt_type(), array, index.result(), value.result(), 1739 NULL, null_check_info); 1740 } 1741 1742 void LIRGenerator::access_load_at(DecoratorSet decorators, BasicType type, 1743 LIRItem& base, LIR_Opr offset, LIR_Opr result, 1744 CodeEmitInfo* patch_info, CodeEmitInfo* load_emit_info) { 1745 decorators |= ACCESS_READ; 1746 LIRAccess access(this, decorators, base, offset, type, patch_info, load_emit_info); 1747 if (access.is_raw()) { 1748 _barrier_set->BarrierSetC1::load_at(access, result); 1749 } else { 1750 _barrier_set->load_at(access, result); 1751 } 1752 } 1753 1754 void LIRGenerator::access_load(DecoratorSet decorators, BasicType type, 1755 LIR_Opr addr, LIR_Opr result) { 1756 decorators |= ACCESS_READ; 1757 LIRAccess access(this, decorators, LIR_OprFact::illegalOpr, LIR_OprFact::illegalOpr, type); 1758 access.set_resolved_addr(addr); 1759 if (access.is_raw()) { 1760 _barrier_set->BarrierSetC1::load(access, result); 1761 } else { 1762 _barrier_set->load(access, result); 1763 } 1764 } 1765 1766 void LIRGenerator::access_store_at(DecoratorSet decorators, BasicType type, 1767 LIRItem& base, LIR_Opr offset, LIR_Opr value, 1768 CodeEmitInfo* patch_info, CodeEmitInfo* store_emit_info) { 1769 decorators |= ACCESS_WRITE; 1770 LIRAccess access(this, decorators, base, offset, type, patch_info, store_emit_info); 1771 if (access.is_raw()) { 1772 _barrier_set->BarrierSetC1::store_at(access, value); 1773 } else { 1774 _barrier_set->store_at(access, value); 1775 } 1776 } 1777 1778 LIR_Opr LIRGenerator::access_atomic_cmpxchg_at(DecoratorSet decorators, BasicType type, 1779 LIRItem& base, LIRItem& offset, LIRItem& cmp_value, LIRItem& new_value) { 1780 decorators |= ACCESS_READ; 1781 decorators |= ACCESS_WRITE; 1782 // Atomic operations are SEQ_CST by default 1783 decorators |= ((decorators & MO_DECORATOR_MASK) != 0) ? MO_SEQ_CST : 0; 1784 LIRAccess access(this, decorators, base, offset, type); 1785 if (access.is_raw()) { 1786 return _barrier_set->BarrierSetC1::atomic_cmpxchg_at(access, cmp_value, new_value); 1787 } else { 1788 return _barrier_set->atomic_cmpxchg_at(access, cmp_value, new_value); 1789 } 1790 } 1791 1792 LIR_Opr LIRGenerator::access_atomic_xchg_at(DecoratorSet decorators, BasicType type, 1793 LIRItem& base, LIRItem& offset, LIRItem& value) { 1794 decorators |= ACCESS_READ; 1795 decorators |= ACCESS_WRITE; 1796 // Atomic operations are SEQ_CST by default 1797 decorators |= ((decorators & MO_DECORATOR_MASK) != 0) ? MO_SEQ_CST : 0; 1798 LIRAccess access(this, decorators, base, offset, type); 1799 if (access.is_raw()) { 1800 return _barrier_set->BarrierSetC1::atomic_xchg_at(access, value); 1801 } else { 1802 return _barrier_set->atomic_xchg_at(access, value); 1803 } 1804 } 1805 1806 LIR_Opr LIRGenerator::access_atomic_add_at(DecoratorSet decorators, BasicType type, 1807 LIRItem& base, LIRItem& offset, LIRItem& value) { 1808 decorators |= ACCESS_READ; 1809 decorators |= ACCESS_WRITE; 1810 // Atomic operations are SEQ_CST by default 1811 decorators |= ((decorators & MO_DECORATOR_MASK) != 0) ? MO_SEQ_CST : 0; 1812 LIRAccess access(this, decorators, base, offset, type); 1813 if (access.is_raw()) { 1814 return _barrier_set->BarrierSetC1::atomic_add_at(access, value); 1815 } else { 1816 return _barrier_set->atomic_add_at(access, value); 1817 } 1818 } 1819 1820 LIR_Opr LIRGenerator::access_resolve(DecoratorSet decorators, LIR_Opr obj) { 1821 // Use stronger ACCESS_WRITE|ACCESS_READ by default. 1822 if ((decorators & (ACCESS_READ | ACCESS_WRITE)) == 0) { 1823 decorators |= ACCESS_READ | ACCESS_WRITE; 1824 } 1825 1826 return _barrier_set->resolve(this, decorators, obj); 1827 } 1828 1829 void LIRGenerator::do_LoadField(LoadField* x) { 1830 bool needs_patching = x->needs_patching(); 1831 bool is_volatile = x->field()->is_volatile(); 1832 BasicType field_type = x->field_type(); 1833 1834 CodeEmitInfo* info = NULL; 1835 if (needs_patching) { 1836 assert(x->explicit_null_check() == NULL, "can't fold null check into patching field access"); 1837 info = state_for(x, x->state_before()); 1838 } else if (x->needs_null_check()) { 1839 NullCheck* nc = x->explicit_null_check(); 1840 if (nc == NULL) { 1841 info = state_for(x); 1842 } else { 1843 info = state_for(nc); 1844 } 1845 } 1846 1847 LIRItem object(x->obj(), this); 1848 1849 object.load_item(); 1850 1851 #ifndef PRODUCT 1852 if (PrintNotLoaded && needs_patching) { 1853 tty->print_cr(" ###class not loaded at load_%s bci %d", 1854 x->is_static() ? "static" : "field", x->printable_bci()); 1855 } 1856 #endif 1857 1858 bool stress_deopt = StressLoopInvariantCodeMotion && info && info->deoptimize_on_exception(); 1859 if (x->needs_null_check() && 1860 (needs_patching || 1861 MacroAssembler::needs_explicit_null_check(x->offset()) || 1862 stress_deopt)) { 1863 if (needs_patching && field_type == T_VALUETYPE) { 1864 // We are loading a "Q" field, but the holder class is not yet loaded. 1865 CodeStub* stub = new DeoptimizeStub(new CodeEmitInfo(info), 1866 Deoptimization::Reason_unloaded, 1867 Deoptimization::Action_make_not_entrant); 1868 __ branch(lir_cond_always, T_ILLEGAL, stub); 1869 } else { 1870 LIR_Opr obj = object.result(); 1871 if (stress_deopt) { 1872 obj = new_register(T_OBJECT); 1873 __ move(LIR_OprFact::oopConst(NULL), obj); 1874 } 1875 // Emit an explicit null check because the offset is too large. 1876 // If the class is not loaded and the object is NULL, we need to deoptimize to throw a 1877 // NoClassDefFoundError in the interpreter instead of an implicit NPE from compiled code. 1878 __ null_check(obj, new CodeEmitInfo(info), /* deoptimize */ needs_patching); 1879 } 1880 } else if (x->value_klass() != NULL && x->default_value() == NULL) { 1881 assert(x->is_static() && !x->value_klass()->is_loaded(), "must be"); 1882 assert(needs_patching, "must be"); 1883 // The value klass was not loaded so we don't know what its default value should be 1884 CodeStub* stub = new DeoptimizeStub(new CodeEmitInfo(info), 1885 Deoptimization::Reason_unloaded, 1886 Deoptimization::Action_make_not_entrant); 1887 __ branch(lir_cond_always, T_ILLEGAL, stub); 1888 } 1889 1890 DecoratorSet decorators = IN_HEAP; 1891 if (is_volatile) { 1892 decorators |= MO_SEQ_CST; 1893 } 1894 if (needs_patching) { 1895 decorators |= C1_NEEDS_PATCHING; 1896 } 1897 1898 LIR_Opr result = rlock_result(x, field_type); 1899 access_load_at(decorators, field_type, 1900 object, LIR_OprFact::intConst(x->offset()), result, 1901 info ? new CodeEmitInfo(info) : NULL, info); 1902 1903 if (x->value_klass() != NULL && x->default_value() != NULL) { 1904 LabelObj* L_end = new LabelObj(); 1905 __ cmp(lir_cond_notEqual, result, LIR_OprFact::oopConst(NULL)); 1906 __ branch(lir_cond_notEqual, T_OBJECT, L_end->label()); 1907 1908 LIRItem default_value(x->default_value(), this); 1909 default_value.load_item(); 1910 __ move(default_value.result(), result); 1911 1912 __ branch_destination(L_end->label()); 1913 } 1914 } 1915 1916 1917 //------------------------java.nio.Buffer.checkIndex------------------------ 1918 1919 // int java.nio.Buffer.checkIndex(int) 1920 void LIRGenerator::do_NIOCheckIndex(Intrinsic* x) { 1921 // NOTE: by the time we are in checkIndex() we are guaranteed that 1922 // the buffer is non-null (because checkIndex is package-private and 1923 // only called from within other methods in the buffer). 1924 assert(x->number_of_arguments() == 2, "wrong type"); 1925 LIRItem buf (x->argument_at(0), this); 1926 LIRItem index(x->argument_at(1), this); 1927 buf.load_item(); 1928 index.load_item(); 1929 1930 LIR_Opr result = rlock_result(x); 1931 if (GenerateRangeChecks) { 1932 CodeEmitInfo* info = state_for(x); 1933 CodeStub* stub = new RangeCheckStub(info, index.result()); 1934 LIR_Opr buf_obj = access_resolve(IS_NOT_NULL | ACCESS_READ, buf.result()); 1935 if (index.result()->is_constant()) { 1936 cmp_mem_int(lir_cond_belowEqual, buf_obj, java_nio_Buffer::limit_offset(), index.result()->as_jint(), info); 1937 __ branch(lir_cond_belowEqual, T_INT, stub); 1938 } else { 1939 cmp_reg_mem(lir_cond_aboveEqual, index.result(), buf_obj, 1940 java_nio_Buffer::limit_offset(), T_INT, info); 1941 __ branch(lir_cond_aboveEqual, T_INT, stub); 1942 } 1943 __ move(index.result(), result); 1944 } else { 1945 // Just load the index into the result register 1946 __ move(index.result(), result); 1947 } 1948 } 1949 1950 1951 //------------------------array access-------------------------------------- 1952 1953 1954 void LIRGenerator::do_ArrayLength(ArrayLength* x) { 1955 LIRItem array(x->array(), this); 1956 array.load_item(); 1957 LIR_Opr reg = rlock_result(x); 1958 1959 CodeEmitInfo* info = NULL; 1960 if (x->needs_null_check()) { 1961 NullCheck* nc = x->explicit_null_check(); 1962 if (nc == NULL) { 1963 info = state_for(x); 1964 } else { 1965 info = state_for(nc); 1966 } 1967 if (StressLoopInvariantCodeMotion && info->deoptimize_on_exception()) { 1968 LIR_Opr obj = new_register(T_OBJECT); 1969 __ move(LIR_OprFact::oopConst(NULL), obj); 1970 __ null_check(obj, new CodeEmitInfo(info)); 1971 } 1972 } 1973 __ load(new LIR_Address(array.result(), arrayOopDesc::length_offset_in_bytes(), T_INT), reg, info, lir_patch_none); 1974 } 1975 1976 1977 void LIRGenerator::do_LoadIndexed(LoadIndexed* x) { 1978 bool use_length = x->length() != NULL; 1979 LIRItem array(x->array(), this); 1980 LIRItem index(x->index(), this); 1981 LIRItem length(this); 1982 bool needs_range_check = x->compute_needs_range_check(); 1983 1984 if (use_length && needs_range_check) { 1985 length.set_instruction(x->length()); 1986 length.load_item(); 1987 } 1988 1989 array.load_item(); 1990 if (index.is_constant() && can_inline_as_constant(x->index())) { 1991 // let it be a constant 1992 index.dont_load_item(); 1993 } else { 1994 index.load_item(); 1995 } 1996 1997 CodeEmitInfo* range_check_info = state_for(x); 1998 CodeEmitInfo* null_check_info = NULL; 1999 if (x->needs_null_check()) { 2000 NullCheck* nc = x->explicit_null_check(); 2001 if (nc != NULL) { 2002 null_check_info = state_for(nc); 2003 } else { 2004 null_check_info = range_check_info; 2005 } 2006 if (StressLoopInvariantCodeMotion && null_check_info->deoptimize_on_exception()) { 2007 LIR_Opr obj = new_register(T_OBJECT); 2008 __ move(LIR_OprFact::oopConst(NULL), obj); 2009 __ null_check(obj, new CodeEmitInfo(null_check_info)); 2010 } 2011 } 2012 2013 if (GenerateRangeChecks && needs_range_check) { 2014 if (StressLoopInvariantCodeMotion && range_check_info->deoptimize_on_exception()) { 2015 __ branch(lir_cond_always, T_ILLEGAL, new RangeCheckStub(range_check_info, index.result(), array.result())); 2016 } else if (use_length) { 2017 // TODO: use a (modified) version of array_range_check that does not require a 2018 // constant length to be loaded to a register 2019 __ cmp(lir_cond_belowEqual, length.result(), index.result()); 2020 __ branch(lir_cond_belowEqual, T_INT, new RangeCheckStub(range_check_info, index.result(), array.result())); 2021 } else { 2022 array_range_check(array.result(), index.result(), null_check_info, range_check_info); 2023 // The range check performs the null check, so clear it out for the load 2024 null_check_info = NULL; 2025 } 2026 } 2027 2028 if (x->array()->is_flattened_array()) { 2029 if (x->array()->declared_type()->is_loaded()) { 2030 // Find the destination address (of the NewValueTypeInstance) 2031 LIR_Opr obj = x->vt()->operand(); 2032 LIRItem obj_item(x->vt(), this); 2033 2034 access_flattened_array(true, array, index, obj_item); 2035 set_no_result(x); 2036 return; 2037 } else { 2038 // If the array is indeed flattened, deopt. Otherwise access it as a normal object array. 2039 CodeEmitInfo* deopt_info = state_for(x, x->state_before()); 2040 maybe_deopt_value_array_access(array, null_check_info, deopt_info); 2041 } 2042 } 2043 DecoratorSet decorators = IN_HEAP | IS_ARRAY; 2044 LIR_Opr result = rlock_result(x, x->elt_type()); 2045 access_load_at(decorators, x->elt_type(), 2046 array, index.result(), result, 2047 NULL, null_check_info); 2048 } 2049 2050 2051 void LIRGenerator::do_NullCheck(NullCheck* x) { 2052 if (x->can_trap()) { 2053 LIRItem value(x->obj(), this); 2054 value.load_item(); 2055 CodeEmitInfo* info = state_for(x); 2056 __ null_check(value.result(), info); 2057 } 2058 } 2059 2060 2061 void LIRGenerator::do_TypeCast(TypeCast* x) { 2062 LIRItem value(x->obj(), this); 2063 value.load_item(); 2064 // the result is the same as from the node we are casting 2065 set_result(x, value.result()); 2066 } 2067 2068 2069 void LIRGenerator::do_Throw(Throw* x) { 2070 LIRItem exception(x->exception(), this); 2071 exception.load_item(); 2072 set_no_result(x); 2073 LIR_Opr exception_opr = exception.result(); 2074 CodeEmitInfo* info = state_for(x, x->state()); 2075 2076 #ifndef PRODUCT 2077 if (PrintC1Statistics) { 2078 increment_counter(Runtime1::throw_count_address(), T_INT); 2079 } 2080 #endif 2081 2082 // check if the instruction has an xhandler in any of the nested scopes 2083 bool unwind = false; 2084 if (info->exception_handlers()->length() == 0) { 2085 // this throw is not inside an xhandler 2086 unwind = true; 2087 } else { 2088 // get some idea of the throw type 2089 bool type_is_exact = true; 2090 ciType* throw_type = x->exception()->exact_type(); 2091 if (throw_type == NULL) { 2092 type_is_exact = false; 2093 throw_type = x->exception()->declared_type(); 2094 } 2095 if (throw_type != NULL && throw_type->is_instance_klass()) { 2096 ciInstanceKlass* throw_klass = (ciInstanceKlass*)throw_type; 2097 unwind = !x->exception_handlers()->could_catch(throw_klass, type_is_exact); 2098 } 2099 } 2100 2101 // do null check before moving exception oop into fixed register 2102 // to avoid a fixed interval with an oop during the null check. 2103 // Use a copy of the CodeEmitInfo because debug information is 2104 // different for null_check and throw. 2105 if (x->exception()->as_NewInstance() == NULL && x->exception()->as_ExceptionObject() == NULL) { 2106 // if the exception object wasn't created using new then it might be null. 2107 __ null_check(exception_opr, new CodeEmitInfo(info, x->state()->copy(ValueStack::ExceptionState, x->state()->bci()))); 2108 } 2109 2110 if (compilation()->env()->jvmti_can_post_on_exceptions()) { 2111 // we need to go through the exception lookup path to get JVMTI 2112 // notification done 2113 unwind = false; 2114 } 2115 2116 // move exception oop into fixed register 2117 __ move(exception_opr, exceptionOopOpr()); 2118 2119 if (unwind) { 2120 __ unwind_exception(exceptionOopOpr()); 2121 } else { 2122 __ throw_exception(exceptionPcOpr(), exceptionOopOpr(), info); 2123 } 2124 } 2125 2126 2127 void LIRGenerator::do_RoundFP(RoundFP* x) { 2128 LIRItem input(x->input(), this); 2129 input.load_item(); 2130 LIR_Opr input_opr = input.result(); 2131 assert(input_opr->is_register(), "why round if value is not in a register?"); 2132 assert(input_opr->is_single_fpu() || input_opr->is_double_fpu(), "input should be floating-point value"); 2133 if (input_opr->is_single_fpu()) { 2134 set_result(x, round_item(input_opr)); // This code path not currently taken 2135 } else { 2136 LIR_Opr result = new_register(T_DOUBLE); 2137 set_vreg_flag(result, must_start_in_memory); 2138 __ roundfp(input_opr, LIR_OprFact::illegalOpr, result); 2139 set_result(x, result); 2140 } 2141 } 2142 2143 // Here UnsafeGetRaw may have x->base() and x->index() be int or long 2144 // on both 64 and 32 bits. Expecting x->base() to be always long on 64bit. 2145 void LIRGenerator::do_UnsafeGetRaw(UnsafeGetRaw* x) { 2146 LIRItem base(x->base(), this); 2147 LIRItem idx(this); 2148 2149 base.load_item(); 2150 if (x->has_index()) { 2151 idx.set_instruction(x->index()); 2152 idx.load_nonconstant(); 2153 } 2154 2155 LIR_Opr reg = rlock_result(x, x->basic_type()); 2156 2157 int log2_scale = 0; 2158 if (x->has_index()) { 2159 log2_scale = x->log2_scale(); 2160 } 2161 2162 assert(!x->has_index() || idx.value() == x->index(), "should match"); 2163 2164 LIR_Opr base_op = base.result(); 2165 LIR_Opr index_op = idx.result(); 2166 #ifndef _LP64 2167 if (base_op->type() == T_LONG) { 2168 base_op = new_register(T_INT); 2169 __ convert(Bytecodes::_l2i, base.result(), base_op); 2170 } 2171 if (x->has_index()) { 2172 if (index_op->type() == T_LONG) { 2173 LIR_Opr long_index_op = index_op; 2174 if (index_op->is_constant()) { 2175 long_index_op = new_register(T_LONG); 2176 __ move(index_op, long_index_op); 2177 } 2178 index_op = new_register(T_INT); 2179 __ convert(Bytecodes::_l2i, long_index_op, index_op); 2180 } else { 2181 assert(x->index()->type()->tag() == intTag, "must be"); 2182 } 2183 } 2184 // At this point base and index should be all ints. 2185 assert(base_op->type() == T_INT && !base_op->is_constant(), "base should be an non-constant int"); 2186 assert(!x->has_index() || index_op->type() == T_INT, "index should be an int"); 2187 #else 2188 if (x->has_index()) { 2189 if (index_op->type() == T_INT) { 2190 if (!index_op->is_constant()) { 2191 index_op = new_register(T_LONG); 2192 __ convert(Bytecodes::_i2l, idx.result(), index_op); 2193 } 2194 } else { 2195 assert(index_op->type() == T_LONG, "must be"); 2196 if (index_op->is_constant()) { 2197 index_op = new_register(T_LONG); 2198 __ move(idx.result(), index_op); 2199 } 2200 } 2201 } 2202 // At this point base is a long non-constant 2203 // Index is a long register or a int constant. 2204 // We allow the constant to stay an int because that would allow us a more compact encoding by 2205 // embedding an immediate offset in the address expression. If we have a long constant, we have to 2206 // move it into a register first. 2207 assert(base_op->type() == T_LONG && !base_op->is_constant(), "base must be a long non-constant"); 2208 assert(!x->has_index() || (index_op->type() == T_INT && index_op->is_constant()) || 2209 (index_op->type() == T_LONG && !index_op->is_constant()), "unexpected index type"); 2210 #endif 2211 2212 BasicType dst_type = x->basic_type(); 2213 2214 LIR_Address* addr; 2215 if (index_op->is_constant()) { 2216 assert(log2_scale == 0, "must not have a scale"); 2217 assert(index_op->type() == T_INT, "only int constants supported"); 2218 addr = new LIR_Address(base_op, index_op->as_jint(), dst_type); 2219 } else { 2220 #ifdef X86 2221 addr = new LIR_Address(base_op, index_op, LIR_Address::Scale(log2_scale), 0, dst_type); 2222 #elif defined(GENERATE_ADDRESS_IS_PREFERRED) 2223 addr = generate_address(base_op, index_op, log2_scale, 0, dst_type); 2224 #else 2225 if (index_op->is_illegal() || log2_scale == 0) { 2226 addr = new LIR_Address(base_op, index_op, dst_type); 2227 } else { 2228 LIR_Opr tmp = new_pointer_register(); 2229 __ shift_left(index_op, log2_scale, tmp); 2230 addr = new LIR_Address(base_op, tmp, dst_type); 2231 } 2232 #endif 2233 } 2234 2235 if (x->may_be_unaligned() && (dst_type == T_LONG || dst_type == T_DOUBLE)) { 2236 __ unaligned_move(addr, reg); 2237 } else { 2238 if (dst_type == T_OBJECT && x->is_wide()) { 2239 __ move_wide(addr, reg); 2240 } else { 2241 __ move(addr, reg); 2242 } 2243 } 2244 } 2245 2246 2247 void LIRGenerator::do_UnsafePutRaw(UnsafePutRaw* x) { 2248 int log2_scale = 0; 2249 BasicType type = x->basic_type(); 2250 2251 if (x->has_index()) { 2252 log2_scale = x->log2_scale(); 2253 } 2254 2255 LIRItem base(x->base(), this); 2256 LIRItem value(x->value(), this); 2257 LIRItem idx(this); 2258 2259 base.load_item(); 2260 if (x->has_index()) { 2261 idx.set_instruction(x->index()); 2262 idx.load_item(); 2263 } 2264 2265 if (type == T_BYTE || type == T_BOOLEAN) { 2266 value.load_byte_item(); 2267 } else { 2268 value.load_item(); 2269 } 2270 2271 set_no_result(x); 2272 2273 LIR_Opr base_op = base.result(); 2274 LIR_Opr index_op = idx.result(); 2275 2276 #ifdef GENERATE_ADDRESS_IS_PREFERRED 2277 LIR_Address* addr = generate_address(base_op, index_op, log2_scale, 0, x->basic_type()); 2278 #else 2279 #ifndef _LP64 2280 if (base_op->type() == T_LONG) { 2281 base_op = new_register(T_INT); 2282 __ convert(Bytecodes::_l2i, base.result(), base_op); 2283 } 2284 if (x->has_index()) { 2285 if (index_op->type() == T_LONG) { 2286 index_op = new_register(T_INT); 2287 __ convert(Bytecodes::_l2i, idx.result(), index_op); 2288 } 2289 } 2290 // At this point base and index should be all ints and not constants 2291 assert(base_op->type() == T_INT && !base_op->is_constant(), "base should be an non-constant int"); 2292 assert(!x->has_index() || (index_op->type() == T_INT && !index_op->is_constant()), "index should be an non-constant int"); 2293 #else 2294 if (x->has_index()) { 2295 if (index_op->type() == T_INT) { 2296 index_op = new_register(T_LONG); 2297 __ convert(Bytecodes::_i2l, idx.result(), index_op); 2298 } 2299 } 2300 // At this point base and index are long and non-constant 2301 assert(base_op->type() == T_LONG && !base_op->is_constant(), "base must be a non-constant long"); 2302 assert(!x->has_index() || (index_op->type() == T_LONG && !index_op->is_constant()), "index must be a non-constant long"); 2303 #endif 2304 2305 if (log2_scale != 0) { 2306 // temporary fix (platform dependent code without shift on Intel would be better) 2307 // TODO: ARM also allows embedded shift in the address 2308 LIR_Opr tmp = new_pointer_register(); 2309 if (TwoOperandLIRForm) { 2310 __ move(index_op, tmp); 2311 index_op = tmp; 2312 } 2313 __ shift_left(index_op, log2_scale, tmp); 2314 if (!TwoOperandLIRForm) { 2315 index_op = tmp; 2316 } 2317 } 2318 2319 LIR_Address* addr = new LIR_Address(base_op, index_op, x->basic_type()); 2320 #endif // !GENERATE_ADDRESS_IS_PREFERRED 2321 __ move(value.result(), addr); 2322 } 2323 2324 2325 void LIRGenerator::do_UnsafeGetObject(UnsafeGetObject* x) { 2326 BasicType type = x->basic_type(); 2327 LIRItem src(x->object(), this); 2328 LIRItem off(x->offset(), this); 2329 2330 off.load_item(); 2331 src.load_item(); 2332 2333 DecoratorSet decorators = IN_HEAP; 2334 2335 if (x->is_volatile()) { 2336 decorators |= MO_SEQ_CST; 2337 } 2338 if (type == T_BOOLEAN) { 2339 decorators |= C1_MASK_BOOLEAN; 2340 } 2341 if (type == T_ARRAY || type == T_OBJECT) { 2342 decorators |= ON_UNKNOWN_OOP_REF; 2343 } 2344 2345 LIR_Opr result = rlock_result(x, type); 2346 access_load_at(decorators, type, 2347 src, off.result(), result); 2348 } 2349 2350 2351 void LIRGenerator::do_UnsafePutObject(UnsafePutObject* x) { 2352 BasicType type = x->basic_type(); 2353 LIRItem src(x->object(), this); 2354 LIRItem off(x->offset(), this); 2355 LIRItem data(x->value(), this); 2356 2357 src.load_item(); 2358 if (type == T_BOOLEAN || type == T_BYTE) { 2359 data.load_byte_item(); 2360 } else { 2361 data.load_item(); 2362 } 2363 off.load_item(); 2364 2365 set_no_result(x); 2366 2367 DecoratorSet decorators = IN_HEAP; 2368 if (type == T_ARRAY || type == T_OBJECT) { 2369 decorators |= ON_UNKNOWN_OOP_REF; 2370 } 2371 if (x->is_volatile()) { 2372 decorators |= MO_SEQ_CST; 2373 } 2374 access_store_at(decorators, type, src, off.result(), data.result()); 2375 } 2376 2377 void LIRGenerator::do_UnsafeGetAndSetObject(UnsafeGetAndSetObject* x) { 2378 BasicType type = x->basic_type(); 2379 LIRItem src(x->object(), this); 2380 LIRItem off(x->offset(), this); 2381 LIRItem value(x->value(), this); 2382 2383 DecoratorSet decorators = IN_HEAP | MO_SEQ_CST; 2384 2385 if (type == T_ARRAY || type == T_OBJECT) { 2386 decorators |= ON_UNKNOWN_OOP_REF; 2387 } 2388 2389 LIR_Opr result; 2390 if (x->is_add()) { 2391 result = access_atomic_add_at(decorators, type, src, off, value); 2392 } else { 2393 result = access_atomic_xchg_at(decorators, type, src, off, value); 2394 } 2395 set_result(x, result); 2396 } 2397 2398 void LIRGenerator::do_SwitchRanges(SwitchRangeArray* x, LIR_Opr value, BlockBegin* default_sux) { 2399 int lng = x->length(); 2400 2401 for (int i = 0; i < lng; i++) { 2402 SwitchRange* one_range = x->at(i); 2403 int low_key = one_range->low_key(); 2404 int high_key = one_range->high_key(); 2405 BlockBegin* dest = one_range->sux(); 2406 if (low_key == high_key) { 2407 __ cmp(lir_cond_equal, value, low_key); 2408 __ branch(lir_cond_equal, T_INT, dest); 2409 } else if (high_key - low_key == 1) { 2410 __ cmp(lir_cond_equal, value, low_key); 2411 __ branch(lir_cond_equal, T_INT, dest); 2412 __ cmp(lir_cond_equal, value, high_key); 2413 __ branch(lir_cond_equal, T_INT, dest); 2414 } else { 2415 LabelObj* L = new LabelObj(); 2416 __ cmp(lir_cond_less, value, low_key); 2417 __ branch(lir_cond_less, T_INT, L->label()); 2418 __ cmp(lir_cond_lessEqual, value, high_key); 2419 __ branch(lir_cond_lessEqual, T_INT, dest); 2420 __ branch_destination(L->label()); 2421 } 2422 } 2423 __ jump(default_sux); 2424 } 2425 2426 2427 SwitchRangeArray* LIRGenerator::create_lookup_ranges(TableSwitch* x) { 2428 SwitchRangeList* res = new SwitchRangeList(); 2429 int len = x->length(); 2430 if (len > 0) { 2431 BlockBegin* sux = x->sux_at(0); 2432 int key = x->lo_key(); 2433 BlockBegin* default_sux = x->default_sux(); 2434 SwitchRange* range = new SwitchRange(key, sux); 2435 for (int i = 0; i < len; i++, key++) { 2436 BlockBegin* new_sux = x->sux_at(i); 2437 if (sux == new_sux) { 2438 // still in same range 2439 range->set_high_key(key); 2440 } else { 2441 // skip tests which explicitly dispatch to the default 2442 if (sux != default_sux) { 2443 res->append(range); 2444 } 2445 range = new SwitchRange(key, new_sux); 2446 } 2447 sux = new_sux; 2448 } 2449 if (res->length() == 0 || res->last() != range) res->append(range); 2450 } 2451 return res; 2452 } 2453 2454 2455 // we expect the keys to be sorted by increasing value 2456 SwitchRangeArray* LIRGenerator::create_lookup_ranges(LookupSwitch* x) { 2457 SwitchRangeList* res = new SwitchRangeList(); 2458 int len = x->length(); 2459 if (len > 0) { 2460 BlockBegin* default_sux = x->default_sux(); 2461 int key = x->key_at(0); 2462 BlockBegin* sux = x->sux_at(0); 2463 SwitchRange* range = new SwitchRange(key, sux); 2464 for (int i = 1; i < len; i++) { 2465 int new_key = x->key_at(i); 2466 BlockBegin* new_sux = x->sux_at(i); 2467 if (key+1 == new_key && sux == new_sux) { 2468 // still in same range 2469 range->set_high_key(new_key); 2470 } else { 2471 // skip tests which explicitly dispatch to the default 2472 if (range->sux() != default_sux) { 2473 res->append(range); 2474 } 2475 range = new SwitchRange(new_key, new_sux); 2476 } 2477 key = new_key; 2478 sux = new_sux; 2479 } 2480 if (res->length() == 0 || res->last() != range) res->append(range); 2481 } 2482 return res; 2483 } 2484 2485 2486 void LIRGenerator::do_TableSwitch(TableSwitch* x) { 2487 LIRItem tag(x->tag(), this); 2488 tag.load_item(); 2489 set_no_result(x); 2490 2491 if (x->is_safepoint()) { 2492 __ safepoint(safepoint_poll_register(), state_for(x, x->state_before())); 2493 } 2494 2495 // move values into phi locations 2496 move_to_phi(x->state()); 2497 2498 int lo_key = x->lo_key(); 2499 int len = x->length(); 2500 assert(lo_key <= (lo_key + (len - 1)), "integer overflow"); 2501 LIR_Opr value = tag.result(); 2502 2503 if (compilation()->env()->comp_level() == CompLevel_full_profile && UseSwitchProfiling) { 2504 ciMethod* method = x->state()->scope()->method(); 2505 ciMethodData* md = method->method_data_or_null(); 2506 assert(md != NULL, "Sanity"); 2507 ciProfileData* data = md->bci_to_data(x->state()->bci()); 2508 assert(data != NULL, "must have profiling data"); 2509 assert(data->is_MultiBranchData(), "bad profile data?"); 2510 int default_count_offset = md->byte_offset_of_slot(data, MultiBranchData::default_count_offset()); 2511 LIR_Opr md_reg = new_register(T_METADATA); 2512 __ metadata2reg(md->constant_encoding(), md_reg); 2513 LIR_Opr data_offset_reg = new_pointer_register(); 2514 LIR_Opr tmp_reg = new_pointer_register(); 2515 2516 __ move(LIR_OprFact::intptrConst(default_count_offset), data_offset_reg); 2517 for (int i = 0; i < len; i++) { 2518 int count_offset = md->byte_offset_of_slot(data, MultiBranchData::case_count_offset(i)); 2519 __ cmp(lir_cond_equal, value, i + lo_key); 2520 __ move(data_offset_reg, tmp_reg); 2521 __ cmove(lir_cond_equal, 2522 LIR_OprFact::intptrConst(count_offset), 2523 tmp_reg, 2524 data_offset_reg, T_INT); 2525 } 2526 2527 LIR_Opr data_reg = new_pointer_register(); 2528 LIR_Address* data_addr = new LIR_Address(md_reg, data_offset_reg, data_reg->type()); 2529 __ move(data_addr, data_reg); 2530 __ add(data_reg, LIR_OprFact::intptrConst(1), data_reg); 2531 __ move(data_reg, data_addr); 2532 } 2533 2534 if (UseTableRanges) { 2535 do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux()); 2536 } else { 2537 for (int i = 0; i < len; i++) { 2538 __ cmp(lir_cond_equal, value, i + lo_key); 2539 __ branch(lir_cond_equal, T_INT, x->sux_at(i)); 2540 } 2541 __ jump(x->default_sux()); 2542 } 2543 } 2544 2545 2546 void LIRGenerator::do_LookupSwitch(LookupSwitch* x) { 2547 LIRItem tag(x->tag(), this); 2548 tag.load_item(); 2549 set_no_result(x); 2550 2551 if (x->is_safepoint()) { 2552 __ safepoint(safepoint_poll_register(), state_for(x, x->state_before())); 2553 } 2554 2555 // move values into phi locations 2556 move_to_phi(x->state()); 2557 2558 LIR_Opr value = tag.result(); 2559 int len = x->length(); 2560 2561 if (compilation()->env()->comp_level() == CompLevel_full_profile && UseSwitchProfiling) { 2562 ciMethod* method = x->state()->scope()->method(); 2563 ciMethodData* md = method->method_data_or_null(); 2564 assert(md != NULL, "Sanity"); 2565 ciProfileData* data = md->bci_to_data(x->state()->bci()); 2566 assert(data != NULL, "must have profiling data"); 2567 assert(data->is_MultiBranchData(), "bad profile data?"); 2568 int default_count_offset = md->byte_offset_of_slot(data, MultiBranchData::default_count_offset()); 2569 LIR_Opr md_reg = new_register(T_METADATA); 2570 __ metadata2reg(md->constant_encoding(), md_reg); 2571 LIR_Opr data_offset_reg = new_pointer_register(); 2572 LIR_Opr tmp_reg = new_pointer_register(); 2573 2574 __ move(LIR_OprFact::intptrConst(default_count_offset), data_offset_reg); 2575 for (int i = 0; i < len; i++) { 2576 int count_offset = md->byte_offset_of_slot(data, MultiBranchData::case_count_offset(i)); 2577 __ cmp(lir_cond_equal, value, x->key_at(i)); 2578 __ move(data_offset_reg, tmp_reg); 2579 __ cmove(lir_cond_equal, 2580 LIR_OprFact::intptrConst(count_offset), 2581 tmp_reg, 2582 data_offset_reg, T_INT); 2583 } 2584 2585 LIR_Opr data_reg = new_pointer_register(); 2586 LIR_Address* data_addr = new LIR_Address(md_reg, data_offset_reg, data_reg->type()); 2587 __ move(data_addr, data_reg); 2588 __ add(data_reg, LIR_OprFact::intptrConst(1), data_reg); 2589 __ move(data_reg, data_addr); 2590 } 2591 2592 if (UseTableRanges) { 2593 do_SwitchRanges(create_lookup_ranges(x), value, x->default_sux()); 2594 } else { 2595 int len = x->length(); 2596 for (int i = 0; i < len; i++) { 2597 __ cmp(lir_cond_equal, value, x->key_at(i)); 2598 __ branch(lir_cond_equal, T_INT, x->sux_at(i)); 2599 } 2600 __ jump(x->default_sux()); 2601 } 2602 } 2603 2604 2605 void LIRGenerator::do_Goto(Goto* x) { 2606 set_no_result(x); 2607 2608 if (block()->next()->as_OsrEntry()) { 2609 // need to free up storage used for OSR entry point 2610 LIR_Opr osrBuffer = block()->next()->operand(); 2611 BasicTypeList signature; 2612 signature.append(NOT_LP64(T_INT) LP64_ONLY(T_LONG)); // pass a pointer to osrBuffer 2613 CallingConvention* cc = frame_map()->c_calling_convention(&signature); 2614 __ move(osrBuffer, cc->args()->at(0)); 2615 __ call_runtime_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_end), 2616 getThreadTemp(), LIR_OprFact::illegalOpr, cc->args()); 2617 } 2618 2619 if (x->is_safepoint()) { 2620 ValueStack* state = x->state_before() ? x->state_before() : x->state(); 2621 2622 // increment backedge counter if needed 2623 CodeEmitInfo* info = state_for(x, state); 2624 increment_backedge_counter(info, x->profiled_bci()); 2625 CodeEmitInfo* safepoint_info = state_for(x, state); 2626 __ safepoint(safepoint_poll_register(), safepoint_info); 2627 } 2628 2629 // Gotos can be folded Ifs, handle this case. 2630 if (x->should_profile()) { 2631 ciMethod* method = x->profiled_method(); 2632 assert(method != NULL, "method should be set if branch is profiled"); 2633 ciMethodData* md = method->method_data_or_null(); 2634 assert(md != NULL, "Sanity"); 2635 ciProfileData* data = md->bci_to_data(x->profiled_bci()); 2636 assert(data != NULL, "must have profiling data"); 2637 int offset; 2638 if (x->direction() == Goto::taken) { 2639 assert(data->is_BranchData(), "need BranchData for two-way branches"); 2640 offset = md->byte_offset_of_slot(data, BranchData::taken_offset()); 2641 } else if (x->direction() == Goto::not_taken) { 2642 assert(data->is_BranchData(), "need BranchData for two-way branches"); 2643 offset = md->byte_offset_of_slot(data, BranchData::not_taken_offset()); 2644 } else { 2645 assert(data->is_JumpData(), "need JumpData for branches"); 2646 offset = md->byte_offset_of_slot(data, JumpData::taken_offset()); 2647 } 2648 LIR_Opr md_reg = new_register(T_METADATA); 2649 __ metadata2reg(md->constant_encoding(), md_reg); 2650 2651 increment_counter(new LIR_Address(md_reg, offset, 2652 NOT_LP64(T_INT) LP64_ONLY(T_LONG)), DataLayout::counter_increment); 2653 } 2654 2655 // emit phi-instruction move after safepoint since this simplifies 2656 // describing the state as the safepoint. 2657 move_to_phi(x->state()); 2658 2659 __ jump(x->default_sux()); 2660 } 2661 2662 /** 2663 * Emit profiling code if needed for arguments, parameters, return value types 2664 * 2665 * @param md MDO the code will update at runtime 2666 * @param md_base_offset common offset in the MDO for this profile and subsequent ones 2667 * @param md_offset offset in the MDO (on top of md_base_offset) for this profile 2668 * @param profiled_k current profile 2669 * @param obj IR node for the object to be profiled 2670 * @param mdp register to hold the pointer inside the MDO (md + md_base_offset). 2671 * Set once we find an update to make and use for next ones. 2672 * @param not_null true if we know obj cannot be null 2673 * @param signature_at_call_k signature at call for obj 2674 * @param callee_signature_k signature of callee for obj 2675 * at call and callee signatures differ at method handle call 2676 * @return the only klass we know will ever be seen at this profile point 2677 */ 2678 ciKlass* LIRGenerator::profile_type(ciMethodData* md, int md_base_offset, int md_offset, intptr_t profiled_k, 2679 Value obj, LIR_Opr& mdp, bool not_null, ciKlass* signature_at_call_k, 2680 ciKlass* callee_signature_k) { 2681 ciKlass* result = NULL; 2682 bool do_null = !not_null && !TypeEntries::was_null_seen(profiled_k); 2683 bool do_update = !TypeEntries::is_type_unknown(profiled_k); 2684 // known not to be null or null bit already set and already set to 2685 // unknown: nothing we can do to improve profiling 2686 if (!do_null && !do_update) { 2687 return result; 2688 } 2689 2690 ciKlass* exact_klass = NULL; 2691 Compilation* comp = Compilation::current(); 2692 if (do_update) { 2693 // try to find exact type, using CHA if possible, so that loading 2694 // the klass from the object can be avoided 2695 ciType* type = obj->exact_type(); 2696 if (type == NULL) { 2697 type = obj->declared_type(); 2698 type = comp->cha_exact_type(type); 2699 } 2700 assert(type == NULL || type->is_klass(), "type should be class"); 2701 exact_klass = (type != NULL && type->is_loaded()) ? (ciKlass*)type : NULL; 2702 2703 do_update = exact_klass == NULL || ciTypeEntries::valid_ciklass(profiled_k) != exact_klass; 2704 } 2705 2706 if (!do_null && !do_update) { 2707 return result; 2708 } 2709 2710 ciKlass* exact_signature_k = NULL; 2711 if (do_update) { 2712 // Is the type from the signature exact (the only one possible)? 2713 exact_signature_k = signature_at_call_k->exact_klass(); 2714 if (exact_signature_k == NULL) { 2715 exact_signature_k = comp->cha_exact_type(signature_at_call_k); 2716 } else { 2717 result = exact_signature_k; 2718 // Known statically. No need to emit any code: prevent 2719 // LIR_Assembler::emit_profile_type() from emitting useless code 2720 profiled_k = ciTypeEntries::with_status(result, profiled_k); 2721 } 2722 // exact_klass and exact_signature_k can be both non NULL but 2723 // different if exact_klass is loaded after the ciObject for 2724 // exact_signature_k is created. 2725 if (exact_klass == NULL && exact_signature_k != NULL && exact_klass != exact_signature_k) { 2726 // sometimes the type of the signature is better than the best type 2727 // the compiler has 2728 exact_klass = exact_signature_k; 2729 } 2730 if (callee_signature_k != NULL && 2731 callee_signature_k != signature_at_call_k) { 2732 ciKlass* improved_klass = callee_signature_k->exact_klass(); 2733 if (improved_klass == NULL) { 2734 improved_klass = comp->cha_exact_type(callee_signature_k); 2735 } 2736 if (exact_klass == NULL && improved_klass != NULL && exact_klass != improved_klass) { 2737 exact_klass = exact_signature_k; 2738 } 2739 } 2740 do_update = exact_klass == NULL || ciTypeEntries::valid_ciklass(profiled_k) != exact_klass; 2741 } 2742 2743 if (!do_null && !do_update) { 2744 return result; 2745 } 2746 2747 if (mdp == LIR_OprFact::illegalOpr) { 2748 mdp = new_register(T_METADATA); 2749 __ metadata2reg(md->constant_encoding(), mdp); 2750 if (md_base_offset != 0) { 2751 LIR_Address* base_type_address = new LIR_Address(mdp, md_base_offset, T_ADDRESS); 2752 mdp = new_pointer_register(); 2753 __ leal(LIR_OprFact::address(base_type_address), mdp); 2754 } 2755 } 2756 LIRItem value(obj, this); 2757 value.load_item(); 2758 __ profile_type(new LIR_Address(mdp, md_offset, T_METADATA), 2759 value.result(), exact_klass, profiled_k, new_pointer_register(), not_null, exact_signature_k != NULL); 2760 return result; 2761 } 2762 2763 // profile parameters on entry to the root of the compilation 2764 void LIRGenerator::profile_parameters(Base* x) { 2765 if (compilation()->profile_parameters()) { 2766 CallingConvention* args = compilation()->frame_map()->incoming_arguments(); 2767 ciMethodData* md = scope()->method()->method_data_or_null(); 2768 assert(md != NULL, "Sanity"); 2769 2770 if (md->parameters_type_data() != NULL) { 2771 ciParametersTypeData* parameters_type_data = md->parameters_type_data(); 2772 ciTypeStackSlotEntries* parameters = parameters_type_data->parameters(); 2773 LIR_Opr mdp = LIR_OprFact::illegalOpr; 2774 for (int java_index = 0, i = 0, j = 0; j < parameters_type_data->number_of_parameters(); i++) { 2775 LIR_Opr src = args->at(i); 2776 assert(!src->is_illegal(), "check"); 2777 BasicType t = src->type(); 2778 if (t == T_OBJECT || t == T_ARRAY) { 2779 intptr_t profiled_k = parameters->type(j); 2780 Local* local = x->state()->local_at(java_index)->as_Local(); 2781 ciKlass* exact = profile_type(md, md->byte_offset_of_slot(parameters_type_data, ParametersTypeData::type_offset(0)), 2782 in_bytes(ParametersTypeData::type_offset(j)) - in_bytes(ParametersTypeData::type_offset(0)), 2783 profiled_k, local, mdp, false, local->declared_type()->as_klass(), NULL); 2784 // If the profile is known statically set it once for all and do not emit any code 2785 if (exact != NULL) { 2786 md->set_parameter_type(j, exact); 2787 } 2788 j++; 2789 } 2790 java_index += type2size[t]; 2791 } 2792 } 2793 } 2794 } 2795 2796 void LIRGenerator::do_Base(Base* x) { 2797 __ std_entry(LIR_OprFact::illegalOpr); 2798 // Emit moves from physical registers / stack slots to virtual registers 2799 CallingConvention* args = compilation()->frame_map()->incoming_arguments(); 2800 IRScope* irScope = compilation()->hir()->top_scope(); 2801 int java_index = 0; 2802 for (int i = 0; i < args->length(); i++) { 2803 LIR_Opr src = args->at(i); 2804 assert(!src->is_illegal(), "check"); 2805 BasicType t = src->type(); 2806 2807 // Types which are smaller than int are passed as int, so 2808 // correct the type which passed. 2809 switch (t) { 2810 case T_BYTE: 2811 case T_BOOLEAN: 2812 case T_SHORT: 2813 case T_CHAR: 2814 t = T_INT; 2815 break; 2816 default: 2817 break; 2818 } 2819 2820 LIR_Opr dest = new_register(t); 2821 __ move(src, dest); 2822 2823 // Assign new location to Local instruction for this local 2824 Local* local = x->state()->local_at(java_index)->as_Local(); 2825 assert(local != NULL, "Locals for incoming arguments must have been created"); 2826 #ifndef __SOFTFP__ 2827 // The java calling convention passes double as long and float as int. 2828 assert(as_ValueType(t)->tag() == local->type()->tag(), "check"); 2829 #endif // __SOFTFP__ 2830 local->set_operand(dest); 2831 _instruction_for_operand.at_put_grow(dest->vreg_number(), local, NULL); 2832 java_index += type2size[t]; 2833 } 2834 2835 if (compilation()->env()->dtrace_method_probes()) { 2836 BasicTypeList signature; 2837 signature.append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread 2838 signature.append(T_METADATA); // Method* 2839 LIR_OprList* args = new LIR_OprList(); 2840 args->append(getThreadPointer()); 2841 LIR_Opr meth = new_register(T_METADATA); 2842 __ metadata2reg(method()->constant_encoding(), meth); 2843 args->append(meth); 2844 call_runtime(&signature, args, CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), voidType, NULL); 2845 } 2846 2847 if (method()->is_synchronized()) { 2848 LIR_Opr obj; 2849 if (method()->is_static()) { 2850 obj = new_register(T_OBJECT); 2851 __ oop2reg(method()->holder()->java_mirror()->constant_encoding(), obj); 2852 } else { 2853 Local* receiver = x->state()->local_at(0)->as_Local(); 2854 assert(receiver != NULL, "must already exist"); 2855 obj = receiver->operand(); 2856 } 2857 assert(obj->is_valid(), "must be valid"); 2858 2859 if (method()->is_synchronized() && GenerateSynchronizationCode) { 2860 LIR_Opr lock = syncLockOpr(); 2861 __ load_stack_address_monitor(0, lock); 2862 2863 CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, SynchronizationEntryBCI), NULL, x->check_flag(Instruction::DeoptimizeOnException)); 2864 CodeStub* slow_path = new MonitorEnterStub(obj, lock, info); 2865 2866 // receiver is guaranteed non-NULL so don't need CodeEmitInfo 2867 __ lock_object(syncTempOpr(), obj, lock, new_register(T_OBJECT), slow_path, NULL); 2868 } 2869 } 2870 if (compilation()->age_code()) { 2871 CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, 0), NULL, false); 2872 decrement_age(info); 2873 } 2874 // increment invocation counters if needed 2875 if (!method()->is_accessor()) { // Accessors do not have MDOs, so no counting. 2876 profile_parameters(x); 2877 CodeEmitInfo* info = new CodeEmitInfo(scope()->start()->state()->copy(ValueStack::StateBefore, SynchronizationEntryBCI), NULL, false); 2878 increment_invocation_counter(info); 2879 } 2880 2881 // all blocks with a successor must end with an unconditional jump 2882 // to the successor even if they are consecutive 2883 __ jump(x->default_sux()); 2884 } 2885 2886 2887 void LIRGenerator::do_OsrEntry(OsrEntry* x) { 2888 // construct our frame and model the production of incoming pointer 2889 // to the OSR buffer. 2890 __ osr_entry(LIR_Assembler::osrBufferPointer()); 2891 LIR_Opr result = rlock_result(x); 2892 __ move(LIR_Assembler::osrBufferPointer(), result); 2893 } 2894 2895 2896 void LIRGenerator::invoke_load_arguments(Invoke* x, LIRItemList* args, const LIR_OprList* arg_list) { 2897 assert(args->length() == arg_list->length(), 2898 "args=%d, arg_list=%d", args->length(), arg_list->length()); 2899 for (int i = x->has_receiver() ? 1 : 0; i < args->length(); i++) { 2900 LIRItem* param = args->at(i); 2901 LIR_Opr loc = arg_list->at(i); 2902 if (loc->is_register()) { 2903 param->load_item_force(loc); 2904 } else { 2905 LIR_Address* addr = loc->as_address_ptr(); 2906 param->load_for_store(addr->type()); 2907 assert(addr->type() != T_VALUETYPE, "not supported yet"); 2908 if (addr->type() == T_OBJECT) { 2909 __ move_wide(param->result(), addr); 2910 } else 2911 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 2912 __ unaligned_move(param->result(), addr); 2913 } else { 2914 __ move(param->result(), addr); 2915 } 2916 } 2917 } 2918 2919 if (x->has_receiver()) { 2920 LIRItem* receiver = args->at(0); 2921 LIR_Opr loc = arg_list->at(0); 2922 if (loc->is_register()) { 2923 receiver->load_item_force(loc); 2924 } else { 2925 assert(loc->is_address(), "just checking"); 2926 receiver->load_for_store(T_OBJECT); 2927 __ move_wide(receiver->result(), loc->as_address_ptr()); 2928 } 2929 } 2930 } 2931 2932 2933 // Visits all arguments, returns appropriate items without loading them 2934 LIRItemList* LIRGenerator::invoke_visit_arguments(Invoke* x) { 2935 LIRItemList* argument_items = new LIRItemList(); 2936 if (x->has_receiver()) { 2937 LIRItem* receiver = new LIRItem(x->receiver(), this); 2938 argument_items->append(receiver); 2939 } 2940 for (int i = 0; i < x->number_of_arguments(); i++) { 2941 LIRItem* param = new LIRItem(x->argument_at(i), this); 2942 argument_items->append(param); 2943 } 2944 return argument_items; 2945 } 2946 2947 2948 // The invoke with receiver has following phases: 2949 // a) traverse and load/lock receiver; 2950 // b) traverse all arguments -> item-array (invoke_visit_argument) 2951 // c) push receiver on stack 2952 // d) load each of the items and push on stack 2953 // e) unlock receiver 2954 // f) move receiver into receiver-register %o0 2955 // g) lock result registers and emit call operation 2956 // 2957 // Before issuing a call, we must spill-save all values on stack 2958 // that are in caller-save register. "spill-save" moves those registers 2959 // either in a free callee-save register or spills them if no free 2960 // callee save register is available. 2961 // 2962 // The problem is where to invoke spill-save. 2963 // - if invoked between e) and f), we may lock callee save 2964 // register in "spill-save" that destroys the receiver register 2965 // before f) is executed 2966 // - if we rearrange f) to be earlier (by loading %o0) it 2967 // may destroy a value on the stack that is currently in %o0 2968 // and is waiting to be spilled 2969 // - if we keep the receiver locked while doing spill-save, 2970 // we cannot spill it as it is spill-locked 2971 // 2972 void LIRGenerator::do_Invoke(Invoke* x) { 2973 CallingConvention* cc = frame_map()->java_calling_convention(x->signature(), true); 2974 2975 LIR_OprList* arg_list = cc->args(); 2976 LIRItemList* args = invoke_visit_arguments(x); 2977 LIR_Opr receiver = LIR_OprFact::illegalOpr; 2978 2979 // setup result register 2980 LIR_Opr result_register = LIR_OprFact::illegalOpr; 2981 if (x->type() != voidType) { 2982 result_register = result_register_for(x->type()); 2983 } 2984 2985 CodeEmitInfo* info = state_for(x, x->state()); 2986 2987 invoke_load_arguments(x, args, arg_list); 2988 2989 if (x->has_receiver()) { 2990 args->at(0)->load_item_force(LIR_Assembler::receiverOpr()); 2991 receiver = args->at(0)->result(); 2992 } 2993 2994 // emit invoke code 2995 assert(receiver->is_illegal() || receiver->is_equal(LIR_Assembler::receiverOpr()), "must match"); 2996 2997 // JSR 292 2998 // Preserve the SP over MethodHandle call sites, if needed. 2999 ciMethod* target = x->target(); 3000 bool is_method_handle_invoke = (// %%% FIXME: Are both of these relevant? 3001 target->is_method_handle_intrinsic() || 3002 target->is_compiled_lambda_form()); 3003 if (is_method_handle_invoke) { 3004 info->set_is_method_handle_invoke(true); 3005 if(FrameMap::method_handle_invoke_SP_save_opr() != LIR_OprFact::illegalOpr) { 3006 __ move(FrameMap::stack_pointer(), FrameMap::method_handle_invoke_SP_save_opr()); 3007 } 3008 } 3009 3010 switch (x->code()) { 3011 case Bytecodes::_invokestatic: 3012 __ call_static(target, result_register, 3013 SharedRuntime::get_resolve_static_call_stub(), 3014 arg_list, info); 3015 break; 3016 case Bytecodes::_invokespecial: 3017 case Bytecodes::_invokevirtual: 3018 case Bytecodes::_invokeinterface: 3019 // for loaded and final (method or class) target we still produce an inline cache, 3020 // in order to be able to call mixed mode 3021 if (x->code() == Bytecodes::_invokespecial || x->target_is_final()) { 3022 __ call_opt_virtual(target, receiver, result_register, 3023 SharedRuntime::get_resolve_opt_virtual_call_stub(), 3024 arg_list, info); 3025 } else if (x->vtable_index() < 0) { 3026 __ call_icvirtual(target, receiver, result_register, 3027 SharedRuntime::get_resolve_virtual_call_stub(), 3028 arg_list, info); 3029 } else { 3030 int entry_offset = in_bytes(Klass::vtable_start_offset()) + x->vtable_index() * vtableEntry::size_in_bytes(); 3031 int vtable_offset = entry_offset + vtableEntry::method_offset_in_bytes(); 3032 __ call_virtual(target, receiver, result_register, vtable_offset, arg_list, info); 3033 } 3034 break; 3035 case Bytecodes::_invokedynamic: { 3036 __ call_dynamic(target, receiver, result_register, 3037 SharedRuntime::get_resolve_static_call_stub(), 3038 arg_list, info); 3039 break; 3040 } 3041 default: 3042 fatal("unexpected bytecode: %s", Bytecodes::name(x->code())); 3043 break; 3044 } 3045 3046 // JSR 292 3047 // Restore the SP after MethodHandle call sites, if needed. 3048 if (is_method_handle_invoke 3049 && FrameMap::method_handle_invoke_SP_save_opr() != LIR_OprFact::illegalOpr) { 3050 __ move(FrameMap::method_handle_invoke_SP_save_opr(), FrameMap::stack_pointer()); 3051 } 3052 3053 if (x->type()->is_float() || x->type()->is_double()) { 3054 // Force rounding of results from non-strictfp when in strictfp 3055 // scope (or when we don't know the strictness of the callee, to 3056 // be safe.) 3057 if (method()->is_strict()) { 3058 if (!x->target_is_loaded() || !x->target_is_strictfp()) { 3059 result_register = round_item(result_register); 3060 } 3061 } 3062 } 3063 3064 if (result_register->is_valid()) { 3065 LIR_Opr result = rlock_result(x); 3066 __ move(result_register, result); 3067 } 3068 } 3069 3070 3071 void LIRGenerator::do_FPIntrinsics(Intrinsic* x) { 3072 assert(x->number_of_arguments() == 1, "wrong type"); 3073 LIRItem value (x->argument_at(0), this); 3074 LIR_Opr reg = rlock_result(x); 3075 value.load_item(); 3076 LIR_Opr tmp = force_to_spill(value.result(), as_BasicType(x->type())); 3077 __ move(tmp, reg); 3078 } 3079 3080 3081 3082 // Code for : x->x() {x->cond()} x->y() ? x->tval() : x->fval() 3083 void LIRGenerator::do_IfOp(IfOp* x) { 3084 #ifdef ASSERT 3085 { 3086 ValueTag xtag = x->x()->type()->tag(); 3087 ValueTag ttag = x->tval()->type()->tag(); 3088 assert(xtag == intTag || xtag == objectTag, "cannot handle others"); 3089 assert(ttag == addressTag || ttag == intTag || ttag == objectTag || ttag == longTag, "cannot handle others"); 3090 assert(ttag == x->fval()->type()->tag(), "cannot handle others"); 3091 } 3092 #endif 3093 3094 LIRItem left(x->x(), this); 3095 LIRItem right(x->y(), this); 3096 left.load_item(); 3097 if (can_inline_as_constant(right.value())) { 3098 right.dont_load_item(); 3099 } else { 3100 right.load_item(); 3101 } 3102 3103 LIRItem t_val(x->tval(), this); 3104 LIRItem f_val(x->fval(), this); 3105 t_val.dont_load_item(); 3106 f_val.dont_load_item(); 3107 LIR_Opr reg = rlock_result(x); 3108 3109 __ cmp(lir_cond(x->cond()), left.result(), right.result()); 3110 __ cmove(lir_cond(x->cond()), t_val.result(), f_val.result(), reg, as_BasicType(x->x()->type())); 3111 } 3112 3113 #ifdef JFR_HAVE_INTRINSICS 3114 void LIRGenerator::do_ClassIDIntrinsic(Intrinsic* x) { 3115 CodeEmitInfo* info = state_for(x); 3116 CodeEmitInfo* info2 = new CodeEmitInfo(info); // Clone for the second null check 3117 3118 assert(info != NULL, "must have info"); 3119 LIRItem arg(x->argument_at(0), this); 3120 3121 arg.load_item(); 3122 LIR_Opr klass = new_register(T_METADATA); 3123 __ move(new LIR_Address(arg.result(), java_lang_Class::klass_offset_in_bytes(), T_ADDRESS), klass, info); 3124 LIR_Opr id = new_register(T_LONG); 3125 ByteSize offset = KLASS_TRACE_ID_OFFSET; 3126 LIR_Address* trace_id_addr = new LIR_Address(klass, in_bytes(offset), T_LONG); 3127 3128 __ move(trace_id_addr, id); 3129 __ logical_or(id, LIR_OprFact::longConst(0x01l), id); 3130 __ store(id, trace_id_addr); 3131 3132 #ifdef TRACE_ID_META_BITS 3133 __ logical_and(id, LIR_OprFact::longConst(~TRACE_ID_META_BITS), id); 3134 #endif 3135 #ifdef TRACE_ID_SHIFT 3136 __ unsigned_shift_right(id, TRACE_ID_SHIFT, id); 3137 #endif 3138 3139 __ move(id, rlock_result(x)); 3140 } 3141 3142 void LIRGenerator::do_getEventWriter(Intrinsic* x) { 3143 LabelObj* L_end = new LabelObj(); 3144 3145 LIR_Address* jobj_addr = new LIR_Address(getThreadPointer(), 3146 in_bytes(THREAD_LOCAL_WRITER_OFFSET_JFR), 3147 T_OBJECT); 3148 LIR_Opr result = rlock_result(x); 3149 __ move_wide(jobj_addr, result); 3150 __ cmp(lir_cond_equal, result, LIR_OprFact::oopConst(NULL)); 3151 __ branch(lir_cond_equal, T_OBJECT, L_end->label()); 3152 3153 LIR_Opr jobj = new_register(T_OBJECT); 3154 __ move(result, jobj); 3155 access_load(IN_NATIVE, T_OBJECT, LIR_OprFact::address(new LIR_Address(jobj, T_OBJECT)), result); 3156 3157 __ branch_destination(L_end->label()); 3158 } 3159 3160 #endif 3161 3162 3163 void LIRGenerator::do_RuntimeCall(address routine, Intrinsic* x) { 3164 assert(x->number_of_arguments() == 0, "wrong type"); 3165 // Enforce computation of _reserved_argument_area_size which is required on some platforms. 3166 BasicTypeList signature; 3167 CallingConvention* cc = frame_map()->c_calling_convention(&signature); 3168 LIR_Opr reg = result_register_for(x->type()); 3169 __ call_runtime_leaf(routine, getThreadTemp(), 3170 reg, new LIR_OprList()); 3171 LIR_Opr result = rlock_result(x); 3172 __ move(reg, result); 3173 } 3174 3175 3176 3177 void LIRGenerator::do_Intrinsic(Intrinsic* x) { 3178 switch (x->id()) { 3179 case vmIntrinsics::_intBitsToFloat : 3180 case vmIntrinsics::_doubleToRawLongBits : 3181 case vmIntrinsics::_longBitsToDouble : 3182 case vmIntrinsics::_floatToRawIntBits : { 3183 do_FPIntrinsics(x); 3184 break; 3185 } 3186 3187 #ifdef JFR_HAVE_INTRINSICS 3188 case vmIntrinsics::_getClassId: 3189 do_ClassIDIntrinsic(x); 3190 break; 3191 case vmIntrinsics::_getEventWriter: 3192 do_getEventWriter(x); 3193 break; 3194 case vmIntrinsics::_counterTime: 3195 do_RuntimeCall(CAST_FROM_FN_PTR(address, JFR_TIME_FUNCTION), x); 3196 break; 3197 #endif 3198 3199 case vmIntrinsics::_currentTimeMillis: 3200 do_RuntimeCall(CAST_FROM_FN_PTR(address, os::javaTimeMillis), x); 3201 break; 3202 3203 case vmIntrinsics::_nanoTime: 3204 do_RuntimeCall(CAST_FROM_FN_PTR(address, os::javaTimeNanos), x); 3205 break; 3206 3207 case vmIntrinsics::_Object_init: do_RegisterFinalizer(x); break; 3208 case vmIntrinsics::_isInstance: do_isInstance(x); break; 3209 case vmIntrinsics::_isPrimitive: do_isPrimitive(x); break; 3210 case vmIntrinsics::_getClass: do_getClass(x); break; 3211 case vmIntrinsics::_currentThread: do_currentThread(x); break; 3212 3213 case vmIntrinsics::_dlog: // fall through 3214 case vmIntrinsics::_dlog10: // fall through 3215 case vmIntrinsics::_dabs: // fall through 3216 case vmIntrinsics::_dsqrt: // fall through 3217 case vmIntrinsics::_dtan: // fall through 3218 case vmIntrinsics::_dsin : // fall through 3219 case vmIntrinsics::_dcos : // fall through 3220 case vmIntrinsics::_dexp : // fall through 3221 case vmIntrinsics::_dpow : do_MathIntrinsic(x); break; 3222 case vmIntrinsics::_arraycopy: do_ArrayCopy(x); break; 3223 3224 case vmIntrinsics::_fmaD: do_FmaIntrinsic(x); break; 3225 case vmIntrinsics::_fmaF: do_FmaIntrinsic(x); break; 3226 3227 // java.nio.Buffer.checkIndex 3228 case vmIntrinsics::_checkIndex: do_NIOCheckIndex(x); break; 3229 3230 case vmIntrinsics::_compareAndSetReference: 3231 do_CompareAndSwap(x, objectType); 3232 break; 3233 case vmIntrinsics::_compareAndSetInt: 3234 do_CompareAndSwap(x, intType); 3235 break; 3236 case vmIntrinsics::_compareAndSetLong: 3237 do_CompareAndSwap(x, longType); 3238 break; 3239 3240 case vmIntrinsics::_loadFence : 3241 __ membar_acquire(); 3242 break; 3243 case vmIntrinsics::_storeFence: 3244 __ membar_release(); 3245 break; 3246 case vmIntrinsics::_fullFence : 3247 __ membar(); 3248 break; 3249 case vmIntrinsics::_onSpinWait: 3250 __ on_spin_wait(); 3251 break; 3252 case vmIntrinsics::_Reference_get: 3253 do_Reference_get(x); 3254 break; 3255 3256 case vmIntrinsics::_updateCRC32: 3257 case vmIntrinsics::_updateBytesCRC32: 3258 case vmIntrinsics::_updateByteBufferCRC32: 3259 do_update_CRC32(x); 3260 break; 3261 3262 case vmIntrinsics::_updateBytesCRC32C: 3263 case vmIntrinsics::_updateDirectByteBufferCRC32C: 3264 do_update_CRC32C(x); 3265 break; 3266 3267 case vmIntrinsics::_vectorizedMismatch: 3268 do_vectorizedMismatch(x); 3269 break; 3270 3271 default: ShouldNotReachHere(); break; 3272 } 3273 } 3274 3275 void LIRGenerator::profile_arguments(ProfileCall* x) { 3276 if (compilation()->profile_arguments()) { 3277 int bci = x->bci_of_invoke(); 3278 ciMethodData* md = x->method()->method_data_or_null(); 3279 assert(md != NULL, "Sanity"); 3280 ciProfileData* data = md->bci_to_data(bci); 3281 if (data != NULL) { 3282 if ((data->is_CallTypeData() && data->as_CallTypeData()->has_arguments()) || 3283 (data->is_VirtualCallTypeData() && data->as_VirtualCallTypeData()->has_arguments())) { 3284 ByteSize extra = data->is_CallTypeData() ? CallTypeData::args_data_offset() : VirtualCallTypeData::args_data_offset(); 3285 int base_offset = md->byte_offset_of_slot(data, extra); 3286 LIR_Opr mdp = LIR_OprFact::illegalOpr; 3287 ciTypeStackSlotEntries* args = data->is_CallTypeData() ? ((ciCallTypeData*)data)->args() : ((ciVirtualCallTypeData*)data)->args(); 3288 3289 Bytecodes::Code bc = x->method()->java_code_at_bci(bci); 3290 int start = 0; 3291 int stop = data->is_CallTypeData() ? ((ciCallTypeData*)data)->number_of_arguments() : ((ciVirtualCallTypeData*)data)->number_of_arguments(); 3292 if (x->callee()->is_loaded() && x->callee()->is_static() && Bytecodes::has_receiver(bc)) { 3293 // first argument is not profiled at call (method handle invoke) 3294 assert(x->method()->raw_code_at_bci(bci) == Bytecodes::_invokehandle, "invokehandle expected"); 3295 start = 1; 3296 } 3297 ciSignature* callee_signature = x->callee()->signature(); 3298 // method handle call to virtual method 3299 bool has_receiver = x->callee()->is_loaded() && !x->callee()->is_static() && !Bytecodes::has_receiver(bc); 3300 ciSignatureStream callee_signature_stream(callee_signature, has_receiver ? x->callee()->holder() : NULL); 3301 3302 bool ignored_will_link; 3303 ciSignature* signature_at_call = NULL; 3304 x->method()->get_method_at_bci(bci, ignored_will_link, &signature_at_call); 3305 ciSignatureStream signature_at_call_stream(signature_at_call); 3306 3307 // if called through method handle invoke, some arguments may have been popped 3308 for (int i = 0; i < stop && i+start < x->nb_profiled_args(); i++) { 3309 int off = in_bytes(TypeEntriesAtCall::argument_type_offset(i)) - in_bytes(TypeEntriesAtCall::args_data_offset()); 3310 ciKlass* exact = profile_type(md, base_offset, off, 3311 args->type(i), x->profiled_arg_at(i+start), mdp, 3312 !x->arg_needs_null_check(i+start), 3313 signature_at_call_stream.next_klass(), callee_signature_stream.next_klass()); 3314 if (exact != NULL) { 3315 md->set_argument_type(bci, i, exact); 3316 } 3317 } 3318 } else { 3319 #ifdef ASSERT 3320 Bytecodes::Code code = x->method()->raw_code_at_bci(x->bci_of_invoke()); 3321 int n = x->nb_profiled_args(); 3322 assert(MethodData::profile_parameters() && (MethodData::profile_arguments_jsr292_only() || 3323 (x->inlined() && ((code == Bytecodes::_invokedynamic && n <= 1) || (code == Bytecodes::_invokehandle && n <= 2)))), 3324 "only at JSR292 bytecodes"); 3325 #endif 3326 } 3327 } 3328 } 3329 } 3330 3331 // profile parameters on entry to an inlined method 3332 void LIRGenerator::profile_parameters_at_call(ProfileCall* x) { 3333 if (compilation()->profile_parameters() && x->inlined()) { 3334 ciMethodData* md = x->callee()->method_data_or_null(); 3335 if (md != NULL) { 3336 ciParametersTypeData* parameters_type_data = md->parameters_type_data(); 3337 if (parameters_type_data != NULL) { 3338 ciTypeStackSlotEntries* parameters = parameters_type_data->parameters(); 3339 LIR_Opr mdp = LIR_OprFact::illegalOpr; 3340 bool has_receiver = !x->callee()->is_static(); 3341 ciSignature* sig = x->callee()->signature(); 3342 ciSignatureStream sig_stream(sig, has_receiver ? x->callee()->holder() : NULL); 3343 int i = 0; // to iterate on the Instructions 3344 Value arg = x->recv(); 3345 bool not_null = false; 3346 int bci = x->bci_of_invoke(); 3347 Bytecodes::Code bc = x->method()->java_code_at_bci(bci); 3348 // The first parameter is the receiver so that's what we start 3349 // with if it exists. One exception is method handle call to 3350 // virtual method: the receiver is in the args list 3351 if (arg == NULL || !Bytecodes::has_receiver(bc)) { 3352 i = 1; 3353 arg = x->profiled_arg_at(0); 3354 not_null = !x->arg_needs_null_check(0); 3355 } 3356 int k = 0; // to iterate on the profile data 3357 for (;;) { 3358 intptr_t profiled_k = parameters->type(k); 3359 ciKlass* exact = profile_type(md, md->byte_offset_of_slot(parameters_type_data, ParametersTypeData::type_offset(0)), 3360 in_bytes(ParametersTypeData::type_offset(k)) - in_bytes(ParametersTypeData::type_offset(0)), 3361 profiled_k, arg, mdp, not_null, sig_stream.next_klass(), NULL); 3362 // If the profile is known statically set it once for all and do not emit any code 3363 if (exact != NULL) { 3364 md->set_parameter_type(k, exact); 3365 } 3366 k++; 3367 if (k >= parameters_type_data->number_of_parameters()) { 3368 #ifdef ASSERT 3369 int extra = 0; 3370 if (MethodData::profile_arguments() && TypeProfileParmsLimit != -1 && 3371 x->nb_profiled_args() >= TypeProfileParmsLimit && 3372 x->recv() != NULL && Bytecodes::has_receiver(bc)) { 3373 extra += 1; 3374 } 3375 assert(i == x->nb_profiled_args() - extra || (TypeProfileParmsLimit != -1 && TypeProfileArgsLimit > TypeProfileParmsLimit), "unused parameters?"); 3376 #endif 3377 break; 3378 } 3379 arg = x->profiled_arg_at(i); 3380 not_null = !x->arg_needs_null_check(i); 3381 i++; 3382 } 3383 } 3384 } 3385 } 3386 } 3387 3388 void LIRGenerator::do_ProfileCall(ProfileCall* x) { 3389 // Need recv in a temporary register so it interferes with the other temporaries 3390 LIR_Opr recv = LIR_OprFact::illegalOpr; 3391 LIR_Opr mdo = new_register(T_METADATA); 3392 // tmp is used to hold the counters on SPARC 3393 LIR_Opr tmp = new_pointer_register(); 3394 3395 if (x->nb_profiled_args() > 0) { 3396 profile_arguments(x); 3397 } 3398 3399 // profile parameters on inlined method entry including receiver 3400 if (x->recv() != NULL || x->nb_profiled_args() > 0) { 3401 profile_parameters_at_call(x); 3402 } 3403 3404 if (x->recv() != NULL) { 3405 LIRItem value(x->recv(), this); 3406 value.load_item(); 3407 recv = new_register(T_OBJECT); 3408 __ move(value.result(), recv); 3409 } 3410 __ profile_call(x->method(), x->bci_of_invoke(), x->callee(), mdo, recv, tmp, x->known_holder()); 3411 } 3412 3413 void LIRGenerator::do_ProfileReturnType(ProfileReturnType* x) { 3414 int bci = x->bci_of_invoke(); 3415 ciMethodData* md = x->method()->method_data_or_null(); 3416 assert(md != NULL, "Sanity"); 3417 ciProfileData* data = md->bci_to_data(bci); 3418 if (data != NULL) { 3419 assert(data->is_CallTypeData() || data->is_VirtualCallTypeData(), "wrong profile data type"); 3420 ciReturnTypeEntry* ret = data->is_CallTypeData() ? ((ciCallTypeData*)data)->ret() : ((ciVirtualCallTypeData*)data)->ret(); 3421 LIR_Opr mdp = LIR_OprFact::illegalOpr; 3422 3423 bool ignored_will_link; 3424 ciSignature* signature_at_call = NULL; 3425 x->method()->get_method_at_bci(bci, ignored_will_link, &signature_at_call); 3426 3427 // The offset within the MDO of the entry to update may be too large 3428 // to be used in load/store instructions on some platforms. So have 3429 // profile_type() compute the address of the profile in a register. 3430 ciKlass* exact = profile_type(md, md->byte_offset_of_slot(data, ret->type_offset()), 0, 3431 ret->type(), x->ret(), mdp, 3432 !x->needs_null_check(), 3433 signature_at_call->return_type()->as_klass(), 3434 x->callee()->signature()->return_type()->as_klass()); 3435 if (exact != NULL) { 3436 md->set_return_type(bci, exact); 3437 } 3438 } 3439 } 3440 3441 void LIRGenerator::do_ProfileInvoke(ProfileInvoke* x) { 3442 // We can safely ignore accessors here, since c2 will inline them anyway, 3443 // accessors are also always mature. 3444 if (!x->inlinee()->is_accessor()) { 3445 CodeEmitInfo* info = state_for(x, x->state(), true); 3446 // Notify the runtime very infrequently only to take care of counter overflows 3447 int freq_log = Tier23InlineeNotifyFreqLog; 3448 double scale; 3449 if (_method->has_option_value("CompileThresholdScaling", scale)) { 3450 freq_log = CompilerConfig::scaled_freq_log(freq_log, scale); 3451 } 3452 increment_event_counter_impl(info, x->inlinee(), LIR_OprFact::intConst(InvocationCounter::count_increment), right_n_bits(freq_log), InvocationEntryBci, false, true); 3453 } 3454 } 3455 3456 void LIRGenerator::increment_backedge_counter_conditionally(LIR_Condition cond, LIR_Opr left, LIR_Opr right, CodeEmitInfo* info, int left_bci, int right_bci, int bci) { 3457 if (compilation()->count_backedges()) { 3458 __ cmp(cond, left, right); 3459 LIR_Opr step = new_register(T_INT); 3460 LIR_Opr plus_one = LIR_OprFact::intConst(InvocationCounter::count_increment); 3461 LIR_Opr zero = LIR_OprFact::intConst(0); 3462 __ cmove(cond, 3463 (left_bci < bci) ? plus_one : zero, 3464 (right_bci < bci) ? plus_one : zero, 3465 step, left->type()); 3466 increment_backedge_counter(info, step, bci); 3467 } 3468 } 3469 3470 3471 void LIRGenerator::increment_event_counter(CodeEmitInfo* info, LIR_Opr step, int bci, bool backedge) { 3472 int freq_log = 0; 3473 int level = compilation()->env()->comp_level(); 3474 if (level == CompLevel_limited_profile) { 3475 freq_log = (backedge ? Tier2BackedgeNotifyFreqLog : Tier2InvokeNotifyFreqLog); 3476 } else if (level == CompLevel_full_profile) { 3477 freq_log = (backedge ? Tier3BackedgeNotifyFreqLog : Tier3InvokeNotifyFreqLog); 3478 } else { 3479 ShouldNotReachHere(); 3480 } 3481 // Increment the appropriate invocation/backedge counter and notify the runtime. 3482 double scale; 3483 if (_method->has_option_value("CompileThresholdScaling", scale)) { 3484 freq_log = CompilerConfig::scaled_freq_log(freq_log, scale); 3485 } 3486 increment_event_counter_impl(info, info->scope()->method(), step, right_n_bits(freq_log), bci, backedge, true); 3487 } 3488 3489 void LIRGenerator::decrement_age(CodeEmitInfo* info) { 3490 ciMethod* method = info->scope()->method(); 3491 MethodCounters* mc_adr = method->ensure_method_counters(); 3492 if (mc_adr != NULL) { 3493 LIR_Opr mc = new_pointer_register(); 3494 __ move(LIR_OprFact::intptrConst(mc_adr), mc); 3495 int offset = in_bytes(MethodCounters::nmethod_age_offset()); 3496 LIR_Address* counter = new LIR_Address(mc, offset, T_INT); 3497 LIR_Opr result = new_register(T_INT); 3498 __ load(counter, result); 3499 __ sub(result, LIR_OprFact::intConst(1), result); 3500 __ store(result, counter); 3501 // DeoptimizeStub will reexecute from the current state in code info. 3502 CodeStub* deopt = new DeoptimizeStub(info, Deoptimization::Reason_tenured, 3503 Deoptimization::Action_make_not_entrant); 3504 __ cmp(lir_cond_lessEqual, result, LIR_OprFact::intConst(0)); 3505 __ branch(lir_cond_lessEqual, T_INT, deopt); 3506 } 3507 } 3508 3509 3510 void LIRGenerator::increment_event_counter_impl(CodeEmitInfo* info, 3511 ciMethod *method, LIR_Opr step, int frequency, 3512 int bci, bool backedge, bool notify) { 3513 assert(frequency == 0 || is_power_of_2(frequency + 1), "Frequency must be x^2 - 1 or 0"); 3514 int level = _compilation->env()->comp_level(); 3515 assert(level > CompLevel_simple, "Shouldn't be here"); 3516 3517 int offset = -1; 3518 LIR_Opr counter_holder = NULL; 3519 if (level == CompLevel_limited_profile) { 3520 MethodCounters* counters_adr = method->ensure_method_counters(); 3521 if (counters_adr == NULL) { 3522 bailout("method counters allocation failed"); 3523 return; 3524 } 3525 counter_holder = new_pointer_register(); 3526 __ move(LIR_OprFact::intptrConst(counters_adr), counter_holder); 3527 offset = in_bytes(backedge ? MethodCounters::backedge_counter_offset() : 3528 MethodCounters::invocation_counter_offset()); 3529 } else if (level == CompLevel_full_profile) { 3530 counter_holder = new_register(T_METADATA); 3531 offset = in_bytes(backedge ? MethodData::backedge_counter_offset() : 3532 MethodData::invocation_counter_offset()); 3533 ciMethodData* md = method->method_data_or_null(); 3534 assert(md != NULL, "Sanity"); 3535 __ metadata2reg(md->constant_encoding(), counter_holder); 3536 } else { 3537 ShouldNotReachHere(); 3538 } 3539 LIR_Address* counter = new LIR_Address(counter_holder, offset, T_INT); 3540 LIR_Opr result = new_register(T_INT); 3541 __ load(counter, result); 3542 __ add(result, step, result); 3543 __ store(result, counter); 3544 if (notify && (!backedge || UseOnStackReplacement)) { 3545 LIR_Opr meth = LIR_OprFact::metadataConst(method->constant_encoding()); 3546 // The bci for info can point to cmp for if's we want the if bci 3547 CodeStub* overflow = new CounterOverflowStub(info, bci, meth); 3548 int freq = frequency << InvocationCounter::count_shift; 3549 if (freq == 0) { 3550 if (!step->is_constant()) { 3551 __ cmp(lir_cond_notEqual, step, LIR_OprFact::intConst(0)); 3552 __ branch(lir_cond_notEqual, T_ILLEGAL, overflow); 3553 } else { 3554 __ branch(lir_cond_always, T_ILLEGAL, overflow); 3555 } 3556 } else { 3557 LIR_Opr mask = load_immediate(freq, T_INT); 3558 if (!step->is_constant()) { 3559 // If step is 0, make sure the overflow check below always fails 3560 __ cmp(lir_cond_notEqual, step, LIR_OprFact::intConst(0)); 3561 __ cmove(lir_cond_notEqual, result, LIR_OprFact::intConst(InvocationCounter::count_increment), result, T_INT); 3562 } 3563 __ logical_and(result, mask, result); 3564 __ cmp(lir_cond_equal, result, LIR_OprFact::intConst(0)); 3565 __ branch(lir_cond_equal, T_INT, overflow); 3566 } 3567 __ branch_destination(overflow->continuation()); 3568 } 3569 } 3570 3571 void LIRGenerator::do_RuntimeCall(RuntimeCall* x) { 3572 LIR_OprList* args = new LIR_OprList(x->number_of_arguments()); 3573 BasicTypeList* signature = new BasicTypeList(x->number_of_arguments()); 3574 3575 if (x->pass_thread()) { 3576 signature->append(LP64_ONLY(T_LONG) NOT_LP64(T_INT)); // thread 3577 args->append(getThreadPointer()); 3578 } 3579 3580 for (int i = 0; i < x->number_of_arguments(); i++) { 3581 Value a = x->argument_at(i); 3582 LIRItem* item = new LIRItem(a, this); 3583 item->load_item(); 3584 args->append(item->result()); 3585 signature->append(as_BasicType(a->type())); 3586 } 3587 3588 LIR_Opr result = call_runtime(signature, args, x->entry(), x->type(), NULL); 3589 if (x->type() == voidType) { 3590 set_no_result(x); 3591 } else { 3592 __ move(result, rlock_result(x)); 3593 } 3594 } 3595 3596 #ifdef ASSERT 3597 void LIRGenerator::do_Assert(Assert *x) { 3598 ValueTag tag = x->x()->type()->tag(); 3599 If::Condition cond = x->cond(); 3600 3601 LIRItem xitem(x->x(), this); 3602 LIRItem yitem(x->y(), this); 3603 LIRItem* xin = &xitem; 3604 LIRItem* yin = &yitem; 3605 3606 assert(tag == intTag, "Only integer assertions are valid!"); 3607 3608 xin->load_item(); 3609 yin->dont_load_item(); 3610 3611 set_no_result(x); 3612 3613 LIR_Opr left = xin->result(); 3614 LIR_Opr right = yin->result(); 3615 3616 __ lir_assert(lir_cond(x->cond()), left, right, x->message(), true); 3617 } 3618 #endif 3619 3620 void LIRGenerator::do_RangeCheckPredicate(RangeCheckPredicate *x) { 3621 3622 3623 Instruction *a = x->x(); 3624 Instruction *b = x->y(); 3625 if (!a || StressRangeCheckElimination) { 3626 assert(!b || StressRangeCheckElimination, "B must also be null"); 3627 3628 CodeEmitInfo *info = state_for(x, x->state()); 3629 CodeStub* stub = new PredicateFailedStub(info); 3630 3631 __ jump(stub); 3632 } else if (a->type()->as_IntConstant() && b->type()->as_IntConstant()) { 3633 int a_int = a->type()->as_IntConstant()->value(); 3634 int b_int = b->type()->as_IntConstant()->value(); 3635 3636 bool ok = false; 3637 3638 switch(x->cond()) { 3639 case Instruction::eql: ok = (a_int == b_int); break; 3640 case Instruction::neq: ok = (a_int != b_int); break; 3641 case Instruction::lss: ok = (a_int < b_int); break; 3642 case Instruction::leq: ok = (a_int <= b_int); break; 3643 case Instruction::gtr: ok = (a_int > b_int); break; 3644 case Instruction::geq: ok = (a_int >= b_int); break; 3645 case Instruction::aeq: ok = ((unsigned int)a_int >= (unsigned int)b_int); break; 3646 case Instruction::beq: ok = ((unsigned int)a_int <= (unsigned int)b_int); break; 3647 default: ShouldNotReachHere(); 3648 } 3649 3650 if (ok) { 3651 3652 CodeEmitInfo *info = state_for(x, x->state()); 3653 CodeStub* stub = new PredicateFailedStub(info); 3654 3655 __ jump(stub); 3656 } 3657 } else { 3658 3659 ValueTag tag = x->x()->type()->tag(); 3660 If::Condition cond = x->cond(); 3661 LIRItem xitem(x->x(), this); 3662 LIRItem yitem(x->y(), this); 3663 LIRItem* xin = &xitem; 3664 LIRItem* yin = &yitem; 3665 3666 assert(tag == intTag, "Only integer deoptimizations are valid!"); 3667 3668 xin->load_item(); 3669 yin->dont_load_item(); 3670 set_no_result(x); 3671 3672 LIR_Opr left = xin->result(); 3673 LIR_Opr right = yin->result(); 3674 3675 CodeEmitInfo *info = state_for(x, x->state()); 3676 CodeStub* stub = new PredicateFailedStub(info); 3677 3678 __ cmp(lir_cond(cond), left, right); 3679 __ branch(lir_cond(cond), right->type(), stub); 3680 } 3681 } 3682 3683 3684 LIR_Opr LIRGenerator::call_runtime(Value arg1, address entry, ValueType* result_type, CodeEmitInfo* info) { 3685 LIRItemList args(1); 3686 LIRItem value(arg1, this); 3687 args.append(&value); 3688 BasicTypeList signature; 3689 signature.append(as_BasicType(arg1->type())); 3690 3691 return call_runtime(&signature, &args, entry, result_type, info); 3692 } 3693 3694 3695 LIR_Opr LIRGenerator::call_runtime(Value arg1, Value arg2, address entry, ValueType* result_type, CodeEmitInfo* info) { 3696 LIRItemList args(2); 3697 LIRItem value1(arg1, this); 3698 LIRItem value2(arg2, this); 3699 args.append(&value1); 3700 args.append(&value2); 3701 BasicTypeList signature; 3702 signature.append(as_BasicType(arg1->type())); 3703 signature.append(as_BasicType(arg2->type())); 3704 3705 return call_runtime(&signature, &args, entry, result_type, info); 3706 } 3707 3708 3709 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIR_OprList* args, 3710 address entry, ValueType* result_type, CodeEmitInfo* info) { 3711 // get a result register 3712 LIR_Opr phys_reg = LIR_OprFact::illegalOpr; 3713 LIR_Opr result = LIR_OprFact::illegalOpr; 3714 if (result_type->tag() != voidTag) { 3715 result = new_register(result_type); 3716 phys_reg = result_register_for(result_type); 3717 } 3718 3719 // move the arguments into the correct location 3720 CallingConvention* cc = frame_map()->c_calling_convention(signature); 3721 assert(cc->length() == args->length(), "argument mismatch"); 3722 for (int i = 0; i < args->length(); i++) { 3723 LIR_Opr arg = args->at(i); 3724 LIR_Opr loc = cc->at(i); 3725 if (loc->is_register()) { 3726 __ move(arg, loc); 3727 } else { 3728 LIR_Address* addr = loc->as_address_ptr(); 3729 // if (!can_store_as_constant(arg)) { 3730 // LIR_Opr tmp = new_register(arg->type()); 3731 // __ move(arg, tmp); 3732 // arg = tmp; 3733 // } 3734 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 3735 __ unaligned_move(arg, addr); 3736 } else { 3737 __ move(arg, addr); 3738 } 3739 } 3740 } 3741 3742 if (info) { 3743 __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info); 3744 } else { 3745 __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args()); 3746 } 3747 if (result->is_valid()) { 3748 __ move(phys_reg, result); 3749 } 3750 return result; 3751 } 3752 3753 3754 LIR_Opr LIRGenerator::call_runtime(BasicTypeArray* signature, LIRItemList* args, 3755 address entry, ValueType* result_type, CodeEmitInfo* info) { 3756 // get a result register 3757 LIR_Opr phys_reg = LIR_OprFact::illegalOpr; 3758 LIR_Opr result = LIR_OprFact::illegalOpr; 3759 if (result_type->tag() != voidTag) { 3760 result = new_register(result_type); 3761 phys_reg = result_register_for(result_type); 3762 } 3763 3764 // move the arguments into the correct location 3765 CallingConvention* cc = frame_map()->c_calling_convention(signature); 3766 3767 assert(cc->length() == args->length(), "argument mismatch"); 3768 for (int i = 0; i < args->length(); i++) { 3769 LIRItem* arg = args->at(i); 3770 LIR_Opr loc = cc->at(i); 3771 if (loc->is_register()) { 3772 arg->load_item_force(loc); 3773 } else { 3774 LIR_Address* addr = loc->as_address_ptr(); 3775 arg->load_for_store(addr->type()); 3776 if (addr->type() == T_LONG || addr->type() == T_DOUBLE) { 3777 __ unaligned_move(arg->result(), addr); 3778 } else { 3779 __ move(arg->result(), addr); 3780 } 3781 } 3782 } 3783 3784 if (info) { 3785 __ call_runtime(entry, getThreadTemp(), phys_reg, cc->args(), info); 3786 } else { 3787 __ call_runtime_leaf(entry, getThreadTemp(), phys_reg, cc->args()); 3788 } 3789 if (result->is_valid()) { 3790 __ move(phys_reg, result); 3791 } 3792 return result; 3793 } 3794 3795 void LIRGenerator::do_MemBar(MemBar* x) { 3796 LIR_Code code = x->code(); 3797 switch(code) { 3798 case lir_membar_acquire : __ membar_acquire(); break; 3799 case lir_membar_release : __ membar_release(); break; 3800 case lir_membar : __ membar(); break; 3801 case lir_membar_loadload : __ membar_loadload(); break; 3802 case lir_membar_storestore: __ membar_storestore(); break; 3803 case lir_membar_loadstore : __ membar_loadstore(); break; 3804 case lir_membar_storeload : __ membar_storeload(); break; 3805 default : ShouldNotReachHere(); break; 3806 } 3807 } 3808 3809 LIR_Opr LIRGenerator::mask_boolean(LIR_Opr array, LIR_Opr value, CodeEmitInfo*& null_check_info) { 3810 LIR_Opr value_fixed = rlock_byte(T_BYTE); 3811 if (TwoOperandLIRForm) { 3812 __ move(value, value_fixed); 3813 __ logical_and(value_fixed, LIR_OprFact::intConst(1), value_fixed); 3814 } else { 3815 __ logical_and(value, LIR_OprFact::intConst(1), value_fixed); 3816 } 3817 LIR_Opr klass = new_register(T_METADATA); 3818 __ move(new LIR_Address(array, oopDesc::klass_offset_in_bytes(), T_ADDRESS), klass, null_check_info); 3819 null_check_info = NULL; 3820 LIR_Opr layout = new_register(T_INT); 3821 __ move(new LIR_Address(klass, in_bytes(Klass::layout_helper_offset()), T_INT), layout); 3822 int diffbit = Klass::layout_helper_boolean_diffbit(); 3823 __ logical_and(layout, LIR_OprFact::intConst(diffbit), layout); 3824 __ cmp(lir_cond_notEqual, layout, LIR_OprFact::intConst(0)); 3825 __ cmove(lir_cond_notEqual, value_fixed, value, value_fixed, T_BYTE); 3826 value = value_fixed; 3827 return value; 3828 } 3829 3830 LIR_Opr LIRGenerator::maybe_mask_boolean(StoreIndexed* x, LIR_Opr array, LIR_Opr value, CodeEmitInfo*& null_check_info) { 3831 if (x->check_boolean()) { 3832 value = mask_boolean(array, value, null_check_info); 3833 } 3834 return value; 3835 }